simade

<b>W215 CL500 ABC HYDRAULIC SYSTEM SERVICE / REPAIR
A JOB I’LL NEVER FORGET</b>

I got an enquiry for the refurbishment of a (2006) W215 CL500 ABC Hydraulic System a couple of months back.

The owner wanted the following work done:

• Full Hydraulic System Bleed with 15 litres of Pentosin CHF11s
• Replacement of all Hydraulic Filters (ABC &amp; Power Steering)
• Replacement of all Accumulators
• Refurbish of Rear Hydraulic Valve Block
• Refurbish of Front Hydraulic Valve Block (due to height drop when parked)
All the parts were sourced by the owner directly from Mercedes Benz and I provided the Hydraulic Seal Ring Kit for the job at hand.

A date was arranged and the owner drove down 200 miles from Leeds to the workshop in Oxford. The service / repair of the hydraulic system started at 0900 hrs (9am) and was completed at 1900 hrs (7pm).

Workshop was prepared, tooling ready, vehicle available, new original parts, we made our introductions, customer settled down for the period and the work started.

The hydraulic system had not been worked on before so it should have been a straight forward service / repair.

This was my job plan:

• Remove all required underbody panels
• Spray all connectors with penetrating anti-seize oil
• Flush hydraulic system with new CHF11s
• Remove and replace ABC micron filter
• Remove and replace power steering filter
• Disconnect and replace rear accumulator
• Disconnect and refurbish rear valve block
• Replace pressure accumulator
• Refit rear valve block
• Test rear system of ABC
• Disconnect refurbish front valve block
• Replace front accumulator
• Refit front valve block
• Test front system of ABC
• Test and top-up entire ABC system
• Replace all removed underbody panels
. . . and job done!

<b>However, things often do not work out as planned</b>


<b>Workshop Bay and Tooling ready for the service / repair</b>


<b>Section for hard tooling (Dismantling)</b>


<b>Section for Soft Tooling (Assembly)</b>


<b>2006 W215 CL500 Silver / Black Leather AMG Factory Body Kit</b>


<b>M113 V8 Engine, Bonnet open ready for ABC Hydraulic Fluid Flush</b>
On inspection of the hydraulic fluid, I discover that the condition, purity and cleanliness of the oil (CHF11s) is well above average condition. I then advice the owner that a flush of the system will not be required at this stage. Filters will be changed, accumulators replaced, valve blocks refurbished and after four to six months of use, the system can then be flushed with another new set of filters.


<b>Old filters removed (long one for the ABC suspension, short one for power steering)</b>


<b>New filters to go in with specially ordered valve block solenoid o-rings in background</b>


<b>Two large Impact accumulators and a small rebound accumulator waiting installation</b>


<b>Rear section of exhaust uncoupled to provide easier access to rear accumulator</b>


<b>Rear of car showing exhaust drop after uncoupling</b>

<b>Rear Accumulator (old) above exhaust and rear sub-frame</b> sprayed with deep penetrating anti-seize oil, to aid dismantling. Tools required for this job are a 22m spanner to hold the neck of the accumulator, standard and stuby length 17m spanners to disconnect the pipe end and a long reach 13m socket set to unmounts from body. It is important that you lower the rear of the exhaust system to make access easier, and you must use the 22m spanner to hold the neck of the accumulator to prevent twisting (and possible shearing) of the feed pipe.


<b>Rear accumulator removed showing feed pipe.</b>

<b>New rear accumulator fitted.</b> It is this accumulator that takes up the impact (compression) shock of the rear suspensions

<b>Rear valve block with attached rebound accumulator before removal</b> The rebound accumulator takes up the rebound (expansion) shock of both front and rear suspension.
Oil showing on parts prior to removal, is deep penetrating anti-sieze oil to aid dismantling of nuts, bolts, connections and fixings.


<b>Rear valve block removed showing only hydraulic pipes</b>Remember I said earlier that things do not often work out as planned – well now this story gets juicy. All the connecting hydraulic pipes disconnected without a problem except pipe line to port FB1 feeding the rear left suspension. It just would not budge. I called the attention of the owner and showed him the problem. I showed him all the tools available to disconnect the hose and made him aware that I would have to resort to brutal methods to dismantle the connection. Taking all into consideration, I was given the go ahead to proceed.

The <b>1st tool</b> used was a standard 17m open end spanner. <b>2nd tool </b>used was an open end ringed hose spanner and this too did not budge the connection. This was when the problem was identified and brought to the attention of the owner. <b>3rd tool</b> used was a 17m crow foot spanner with an extension bar to provide leverage. This too did not work. <b>4th tool</b> was an adjustable locking wrench spanner with squirts of liquid nitrogen to freeze shrink the connection. After repeated attempts, slight turning of the connection was achieved. The <b>5th and final tool</b> used was a lockable griping plier. The hose connection was turned clockwise and anticlockwise slowly and repeatedly until it was freed. The entire procedure of freeing the connection took about an hour. Care had to be taken not to break the hose pipe and not to put excessive load on the aluminium valve block body which could cause it to crack.

<b>Hose connection after it had been freed</b> showing corrosive bond on the first four thread splines. There was no damage what so ever to the aluminium block connection. The threading was then picked out and cleaned and I’m glad to say when it was finally fitted back it threaded properly and did not leak. I did coat the threading on the hose end with white grease to stop further chemical reaction and binding (locking) in the future.


<b>Dismantled valve block showing height adjustment and shut off solenoids</b>


<b>Shut off solenoids showing deterioration of seals and washers</b>


Height adjusting solenoids showing deterioration of seals and washers

<b>Rebuilt solenoids coupled to valve block body</b> and all electrical sockets and points coated with di-electric grease to avoid electrical connection failure

<b>Completely rebuilt valve block back in its position </b>under and forward of the left rear wheel. The system was then tested for leaks and function (including the connection to rear accumulator) and the results were excellent.
At this stage I measured the ride heights and requested the owner to take the car for a 15 min drive to warm up the hydraulic fluid and on return to check again for leaks and any visible drop in ride height. Again results were excellent.
Now that the rear had been taken care of, I proceeded to the front of the car to service and repair the front valve block assembly which was leaking internally and causing the front suspension to drop after being parked and over a few hours.


<b>Front valve block in the process of being removed</b>Again, oil stains are from earlier spray of deep penetrating anti-seize oil.
All the hose connections came off without any problems and the front valve block assembly was brought to the work bench for dis-assembly. Brackets, fixings and attached rebound accumulator which takes up the impact (compression) shock for the front suspension all came off easily too.
The height adjusting solenoids twisted off and detached from the aluminium valve body without any issues.
The shut off solenoids were the last to be detached. The left shut off solenoid was very stiff, but it eventually detached as it should. However, the right shut off solenoid refused to budge.
The owner of the car had come down to the workshop and was watching the dis-assembly procedure and witnessed the problem that had now reared its head.
Dry cloths were used to grip and attempt to turn the solenoid to its detaching position but it would not turn. Clamps were used and still it would not turn. The good old vice was applied but still the solenoid would not turn and detach. Witnessing the efforts and failed attempts of the solenoid removal, the owner asked if he should purchase a new valve block, it was that serious.
After an hour of failed attempts, I decided that since I had a spare shut off solenoid at hand, I would saw (cut) off the stuck solenoid so as to remove it from the aluminium valve block. It was apparent to the owner that there was no other remedy so I was given the go ahead to exercise this emergency surgery procedure.
Using a thin blade disc and an air drill, the solenoid was cut off and I was able to remove the entire solenoid without any damage or scaring to the aluminium valve block.


<b>Sawn (chopped) shut off solenoid</b>The air of panic subsided and all the seals were replaced with new ones. The solenoids fitted (with the spare I had) and the re-assembled unit was fitted to the car.
(Phone battery had run dead and this was not the time to recharge so unfortunately pictures stopped)
The ABC hydraulic system reservoir was filled (slightly above max point) to compensate for hydraulic loss and air gaps and the system was started and primed. There were no leaks and the suspension worked perfectly, raising and lowering and maintaining its ride height. Hydraulic fluid levels were topped up to the required quantities and mark and all the under body panels were securely bolted.
The <span class="highlight">W215</span> CL500 had undergone major surgery but the outcome was good.


<b>The next day, I got a text from the owner</b> that ride height had maintained overnight and a day later another text that the height was still holding and everything was working perfect.
Car and owner are presently back in Leeds and all four AMG 19” wheels are being professionally cleaned, skimmed and polished.

<i>Thanks for reading.</i>

biker349

great write up and pictures. don't know if i could of overcome those hurdles. i couldn't. just goes to show things sometimes aren't as easy as they seem. thanks for sharing.

DannyL

Great post! That might be the best illustrated and explained piece of work I have ever seen on here...

Cheers

simade

It is common knowledge that when we experience a very hard suspension and additionally the ABC-oil level in the reservoir does not sink to the lower value on engine start, then the two or either of the accumulators (front and rear axle) can be defective. With strong bumps a brief red ABC message comes on the screen, even though the pressure of the tandem pump is still about 190 bar. As it gets worse, this message will come on even with small bumps. The diagnosis then gives the error C1525-016: level calibration has not been performed successfully. New accumulators are the solution to the problem.

Because ride becomes hard and bouncy due to accumulator sphere damage, this shows the (partial) shock absorption property of the compressed nitrogen and diaphragm setup of accumulator spheres.

In my last post I talked about shock absorption with regards to compression and rebound and these effects can be smoothened out with springs, air or any decompressable material. There was a time when bicycles only had the air in their tyres as a means of absorbing shocks. Then springs in the riders’ seat were introduced to further enhance a smoother ride. With purpose built cylinder shock absorbers, the spring eventually gave way to advanced systems.
The Mercedes W215 W220 vehicles using ABC Hydraulic systems use several components (all working in tandem) to absorb shock.
These include: 1. The Air in tyres 2. Rubber in bushes 3. Gas filled Shock absorbers 4. Pressure accumulators and 5. Foam in the seats of the car.

The hydraulic accumulators store fluid under pressure and serve a number of functions within a hydraulic system. With a specific amount of fluid stored under pressure it is released when required to perform a specific task in the hydraulic system. The accumulators provide several functions, which are:
• Energy storage
• Compensation of temperature fluctuations
• Cushioning of pressure shocks
• Reduction of Fluid Hammer during sudden switching of valves
• Dampening vibrations
• Leakage compensation of internal seals and valves

Applications that utilise large flows at high speeds primarily use accumulators for energy storage. When required, the accumulator pushes fluid into the hydraulic circuit to add to the pump flow. When the actuators in the hydraulic system are not in motion, the accumulator will refill. Accumulators can also operate as energy sources during normal operation of the system (i.e. cushioning).

Gas-pressurised accumulators use nitrogen both because it is relatively inert. This prevents danger of explosion in case of leakage of the bladder, diaphragm or piston. Also, nitrogen is relatively cheap because it is the most abundant gas in our atmosphere.

Hydraulic fluid is not very compressible and in fact, hydraulic oil will compress less than 0.5% per 1,000 psi. So at an astounding pressure of 10,000 psi, oil will be compressed by a measly 4%. In actual hydraulic systems, the compression can actually be higher due to entrained air within the oil.
Decompression of high pressure fluids are a definite concern, as a lot of energy can be released, that energy release typically happens in fractions of a second. High pressure systems, require sub circuits such as (gas filled) Accumulators to control decompression. Gases are highly compressible.
The short explanation of accumulator operation is this: Air bag is filled with gas, hydraulic fluid is squeezed into the space taken up by the gas, gas tries to push out the hydraulic fluid, and opening a downstream valve allows the gas to push out the hydraulic fluid. This is done to store energy, to compensate for leakage or to reduce shock or vibration.
Because a small pump can be used with an accumulator to provide high flow in hydraulic systems, size and cost are saved on the pump which is the prime oil mover making this combination method of storing energy, economical and efficient.
Energy storage doesn’t have to be for continuous cycling, and the accumulators are used for emergency energy during pump failure. The pressurized fluid in the accumulator (with the shut-off solenoids) can be used to retain pressure in the system to move the vehicle to a safe position where it can stay until power is restored or the malfunction corrected.
For use as leakage compensation, an accumulator can last for extended periods of time. An accumulator can provide constant pressure, even while flow is slowly lost to leakage through piston seals or control valve clearances. When accumulator pressure drops to a critical point, a pressure switch will tell the pump to come on for only as long as it takes to refill the accumulator.

Because of the physical properties of hydraulic fluid, it is easy to transmit shock and vibration through the pipes, tubes and hoses of the system. Some pumps, for example, create pulses of pressure when the pistons or gears reach their outlet port. Accumulators built into the system absorb these pulses and shocks like the struts on your cars suspension, absorbing bumps in the road and providing smoother operation.
Sometimes pressure spikes are quite large, but by adding an accumulator into the return line, decompression shocks can be absorbed and prevent damage to the downstream components, which in a return line, are often not rated for high pressure.

History
The first Hydraulic accumulator was made by William Armstrong in 1846 where he built a crane powered by water of the town mains at Newcastle, United Kingdom.

Accumulators are devices used to store fluid power to do the following:
• Dampen pulsations and shocks of a periodic nature
• Increase the speed of the operational circuit.
• Standby power supply circuits.
• Surge reduction circuits
• Compensate for internal leakage

Accumulators
• A Hydraulic Accumulator is energy storage device.
• It is pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure by an external source.
• The external source used can be a spring, a raised weight, or a compressed gas.
• The main reasons that an accumulator is used in a hydraulic system, is that the pump doesn’t need to be so large to cope with extremes of demand and supply circuit can respond quickly to any temporary demand and to smooth pulsation.

Benefits of the Accumulator
• Lower installed system costs, accumulator assisted hydraulics can reduce the size of the pump and electric motor which results in a smaller amount of oil used, a smaller reservoir and reduced equipment costs.
• Less leakage and maintenance costs, the ability to reduce system shocks will prolong component life, reduce leakage from pipe joints and minimize hydraulic system maintenance costs.
• Improved performance, low inertia bladder accumulators can provide instantaneous response time to meet peak flow requirements. They can also help to achieve constant pressure in systems using variable displacement pumps for improved productivity and quality.
• Reduced noise levels, reduced pump and motor size couple with system shock absorption overall machine sound levels and results in higher operator productivity.
• Flexible design approaches. A wide range of accumulator types and sizes, including accessory items, provides a versatile and easy to apply design approach.
• Reduced energy costs, cost savings of up to 33% are achievable in high performance industrial machinery using accumulators.
Diaphragm Accumulators used in the W215 and W220 are similar to bladder type, expect an elastomeric diaphragm is used in place of a bag.
• This would typically reduce the usable volume of the accumulator, so the diaphragm accumulator may not have volume capacity of a bladder accumulator.
• Diaphragm accumulator may be spherical or cylindrical.
• The main difference with bladder accumulator is an increased maximum compression ratio of approximately 8:1
• It is low weight, compact design and good for shock applications (good response characteristics)
• Their main Advantage: Highest efficiency with tests showing 97 percent energy retainment.
• Their main Disadvantage: Nitrogen will permeate the foam bladder material over time and need to be periodically recharged.

W215 / W220 ABC Hydraulic System
The hydraulic system in the Mercedes type 215 and 220 contains about 4 litres of CHF11s fully synthetic oil.
The pressure supply operates in normal driving operation with an ABC-oil pressure between 180 and 200 bar.
Pressure peaks in the system are intercepted in the front valve unit pressure supply (52) by a pulsation damper (52a). This unit prevents and relieves pressures over 200 bar through a pressure relief valve. Also in the return manifold at the front valve block unit Y36 / 1 and in the pressure valve unit 52 along with its pulsation damper (52a) are back pressure valves running a minimum pressure of 10 bar in the return line as a system safely.
In the main steel-pressure accumulators, a membrane separates the oil chamber from the gas chamber with a gas volume of 650 cc, gas pressure is 100 bar, but imprinted outside the Pulsation sphere is value of 200 bar.

Working pressure: red, control pressure: blue, return: green
1 tandem pump, 2a oil filter, 9 oil radiator, 9 oil cooler, 53 accumulator return, B4 / 5 pressure sensor, y1 control valve, y2 check valve , 14 accumulators front, 4 axles accumulators rear axles, B40 / 1 temperature sensor, 52 pulsation dampener, 52b pressure relief valve 56/57 vent valves

Citroen Pressurized Spheres
A fundamental component of the Citroën hydraulic system is the pressurized sphere. They are used for a variety of purposes, Pressure maintenance, Height levelling, Load bearing and Shock absorption; but each one functions in exactly the same way.

The Main Accumulator
The first use of a pressurized sphere is as the main accumulator. It collects high-pressure fluid from the pump and distributes it to the subsystems. It is connected to an electronic pressure regulator switch. When pressure is low, e.g. at start-up time, the switch is tripped, engaging the pump, filling the pressurized sphere with fluid. When the pressure inside the sphere reaches a certain point the switch is cut and the supply of high-pressure fluid stops.
Each of the subsystems draws more or less directly from this sphere as pressure is needed to perform its specific function. Even if there is a constant draw on the accumulated high-pressure fluid, the pump will only be engaged intermittently to ensure that the pressure in the accumulator never gets too low.

The "Load-bearing" Shocks
Each load-bearing shock is a simple piston with a pressurized sphere on top of it. Hydraulic fluid can pass back and forth between the piston and the sphere. The pressure of the compressed nitrogen in the sphere counteracts the force of the weight of the body. In this way the spheres function as springs or torsion bars would in conventional cars. An iris in the orifice between the piston and the sphere produces a dampening effect.
Pressure flows from the hydraulic circuit to the suspension cylinders, pressurizing the bottom part of the spheres and suspension cylinders. Suspension works by means of a piston forcing hydraulic fluid into the sphere, compacting the nitrogen in the upper part of the sphere; damping is provided by a two-way 'leaf valve' in the opening of the sphere. Hydraulic fluid has to squeeze back and forth through this valve which causes resistance and controls the suspension movements. It is the simplest damper and one of the most efficient.

The Mercedes W215 / W220 hydraulic suspension
41 Rear suspension strut
a - Rubber mount jounce stop n - Suspension strut support bearing
b - Top wiper o - Hydraulic pipe
c - Top spring plate p - Top guide sleeve
d - Piston rod tube q - High-pressure seal
e - Piston rod r - Steel spring
f - Position magnet s - Protective boot
g - Hydraulic cylinder t - Hydraulic cylinder bottom stop
h - Bottom guide sleeve u - Shock absorber piston rod
i - Bottom wiper v - Shock absorber
j - Inner bump stop w - Lower mount
k - Outer bump stop x - High-pressure seal
l - Bottom spring plate
m - Rubber mount rebound stop
B22/1 - Left rear suspension strut motion sensor
822/ - Right rear suspension strut motion sensor

The suspension strut forms a unit comprising hydraulic cylinder, steel spring and shock absorber. The suspension strut motion sensor is integrated in the hydraulic cylinder. The shock absorber is a twin-tube shock absorber with gas preload.

Function
The weight of the vehicle is supported by the oil in the hydraulic cylinder and by a coil spring connected in series. The coil spring is supported at the wheel on a spring plate rigidly connected to the shock absorber tube. The spring is supported at the body on the single-acting hydraulic cylinder (plunger).

By adjusting the hydraulic cylinder in the direction of the suspension strut and the resultant change in spring length, additional forces are produced which influence the suspension and damping in the frequency range up to 5 Hertz.
The vehicle level is raised and lowered by filling and emptying the oil chamber which reduces or increases the length of the suspension strut as a result.
To move the hydraulic cylinder out or in, oil is delivered to the suspension strut or oil flows out of the suspension strut into the return flow circuit.
A passive twin-tube gas pressure shock absorber connected in parallel with the hydraulic cylinder and suspension strut is responsible for damping the higher frequency wheel vibrations. The hydraulic cylinder takes over the active damping of the lower frequency body vibrations.
A Pressurised Condition B Depressurised Condition
In my conclusion, the accumulators’ Primary purpose is to store energy and maintain pulse free pressure in the system during operation. However (as in the Citroen system) the accumulators also have a Secondary purpose of assisting the system (of included gas shock absorbers) in the dampening of compression, rebound and liner shocks occurring in both static and dynamic use.

MagCL

Awesome post!!!

I have to rebuild my blocks too and was wondering if anyone knows where to source the solenoids just in case one broke?

What are the best o-rings to use? Viton, Buna 70, HNBR ??

It looks like there are big blue o-rings on your shut off solenoids, are they indeed o-rings and should they be replaced as well? If so, would you have the size?

Thanks

Dr Matt

Supposed to use Buna-n o-rings. I just rebuilt mine and was able to get O-rings from a local industrial hardware store. The blue rings are indeed O-rings but are just to seal dirt and water out of the block. I didn't find the right size to replace mine & they appeared to be in good shape, so I just left them.

FWIW since I just rebuilt mine this week, the solenoids were difficult to remove, but none of mine were as bad as the OP's bad one. One was very difficult to put back in, so I pulled it back off and sure enough, a couple of the new O-rings were damaged. Lesson learned, if it doesn't go back on easy you probably had an o-ring tear on assembly.

Haven't tested mine yet since I'm still waiting on a hydraulics shop to build me a new HPE hose. Be nice to get one that lasts 20,000 miles, or dare I say it, even more than that.

simade

You can use Buna-Nitrile O-rings (70 shore) but the best are Vitron O-rings (75 shore).
As a Forum member earlier pointed out, "The blue rings are indeed O-rings but are just to seal dirt and water out of the block".
He was also correct to advice that "Lesson learned, if it doesn't go back on easy you probably had an o-ring tear on assembly" (or an o-ring of wrong size - too thick) - so lubricate generously with the hydraulic oil and apply little pressure.
When you have the solenoids off, use a plastic picker to lift off the old and to replace the O-rings. You must not use anything (metal) that can mark the backup washers to prevent the seal from extruding through any gaps while under pressure - causing internal leakage.
Solenoids can be sourced from China (Alibaba) and the web addresses are:
Shut off Solenoid
http://www.alibaba.com/product-detai...279993360.html

Height Control Solenoid
http://www.alibaba.com/product-detai...281249849.html

Avoid using harsh cleaning products. These can harm the shut-off solenoid plunger seal and the backup washers. There is also a very soft weather seal in the electrical plugs and they will dissolve with harsh cleaning compounds. When the plugs are removed, tuck well away and cover with tape to prevent hydraulic fluid from dripping into them (forcing you to want to clean them).
A light coating of Die-electric grease (using a wood tooth-pick) to apply on the socket pins will maintain connectivity and also make sure the pins are straight. Be very careful here because the pins can break easily.
Solenoid seizure is extremely rare. Just take your time and work in a clean well lit environment.
Have Fun!

Welwynnick

Simade, do you have a lot of experience with maintaining ABC systems? I ask because many folks find diagnosis to be difficult, never mind the repairs themselves, and in this instance the actions were decided up-front. Did the customer consult with you first, discussing symptoms and agreeing causes, etc?

Cheers, Nick

simade

Yes! the customer did consult me. But best advise (WHY) can only be provided after a series of questions and full details of all occurrences i.e. HOW (slow / fast / interval), WHEN (start / off / cold / hot ), WHERE (front / back / one side or two). I sometimes do get caught out too.

karmaco

Thanks so much for taking the time to write on this topic. The hydraulics suspension has dropped on front left side after a month or two of unheated winter storage on my '05 CL65 in Minnesota. I'm guessing that'll mean a rebuild in my future. This posting will give me some confidence when I start working on it.

slonar21

Found this today, lots of ABC info

https://www.abcspecialist.nl/uploads..._watermark.pdf

bonspy

Recognizing that this is a few years old I'm not certain that anyone will see this, but if the OP sees it, ***** THANK YOU!!!!*****

I have a 2003 CL 55 AMG and have been wondering about this repair job should it ever come up for my beloved CL 55 AMG, and now I have an excellent description of the steps involved in coping with the procedures. This might sound a bit over the top; however, it is entirely true, I have lusted after this vehicle for many years. The CL 55 AMG Kompressor is one of the best "Q cars" on the planet. The car looks like a very staid vehicle of a business executive, yet under the hood lies a beast of an engine and with the little bit of tweaking I've done to mine the car will go from 0 to 62 mph in 3.85 seconds. That 0 to 62 figure is 4.8 seconds in the CL 55 AMG that is bone stock, so with the assistance of a very well-known and reliable Mercedes AMG exclusive mechanic the car received a very hearty upgrade of its ECU. He also did some work on a cold air intake and changed the supercharger pulley to make horsepower gains, which he said brought the car to around 560 horsepower, though his shop did not have a dyno to verify the horsepower gains, he did have a copy of the dyno print out of CL 55 AMGs he'd worked on with the same upgrades and it buttressed his claims of the 560 horsepower for the car. In the ECU upgrade he also took the top speed governor off the car, so 155 mph is no longer the car's top speed. While I have not gone above 140 mph ON A TRACK, I am convinced the car will likely top out at about 170 mph or close to it.

In any case, thank you so much for posting this information. I am certain that any owner of a car with ABC will appreciate it too.

Regards to all-

RM Phillips