NewBlack55

Had the car at the dyno today....

Even with ESP off the car was still unable to run on the dyno.

You could tell that the car was still trying to apply the brakes with ESP off and you could clearly smell them.

Ended up with the ESP and ABS failure warnings.

I think these cars are getting too smart. They have had an SL55 on the Dyno without this issue. They were able to just switch it off at the dash and get in the runs.........

With the brakes interviening it pulle djust over 300HP.

Schiz

mbprince

you would think that there has to be some 'known' (by MB or AMG) test mode for the dyno. the techs at dealerships would probably not know this but if anyone has close contacts at AMG - there in may lie the answer!!

stephens

The ABS and ESP failure warnings are normal and are a result of the car believing there is an ABS sensor failure because the front wheels aren't turning.

The code in the SL55 and E55 ECU is identical, so your problem with ESP doesn't make sense.

The procedure I use is ESP off, car in manual run in third gear. The car, even when strapped down, has traction problems.
You have to be careful with heat, and can only expect 3 or 4 runs before the car starts dropping power.

NewBlack55

Stephens,

I would agree that something was strange.

We followed the same procedure.

ESP Off
Manual Mode
Hold in 3rd

Made two runs. Expected to get the codes on the first run. You could tell the brakes we playing in on the first run.

After run one, we did not shut down the car, warnings were lit up. The ESP light went out with the ESP error and would not come back on by pressing the button.

On the second run, I had someone watch the rear brakes and you could see them come in about 2500.

I had the suspension in 2. The only other thing I can think of is that we had the car raised to give extra clearance for the front straps. Does this trigger something else in the computer?

The shop is solid and the have run mercedes before just not the new E55. Before mine they ran a Supercharged Z06 Vette that put down 512 at the rear wheels.

BTW, what numbers did your put down?

Thanks,

Schiz

blando

The C32 has a Dyno mode that COMPLETELY shuts off ESP, ABS, and BAS.

You put the key in position "1" (or "2" - I can't remember.) Then you press and hold the trip reset in for about 40 seconds until you hear a beep.

You will then see new menu options like Dyno mode and additional engine info. You can also see the oil level to the tenth of a quart.

Not sure if the E55 is the same, but it seems like the MB folks thought of this...

NewBlack55

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NewBlack55

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NewBlack55

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stephens

The only difference we raise the car for the fitting of straps, then lower it again to do the runs.
Each brand of Dyno reads differently, so you cannot really compare them, but to give you an idea, I am getting 385rwhp on a Dyno Dynamics dyno. I would expect to see 420-425 on a Dynojet. (we use 26% for driveline losses)
I have intake mods and a Powerchip ECU upgradewhich gave me an additional 15-20hp. I am now waiting for a pulley to arrive along with some other modifications courtesy of Vath.

NewBlack55

Thanks Stephens, I plan to chat with the MB folks in the AM.

I hope to sort this out and return to the shop next week for another run at it.

Car is back to normal and put down a 12.3 in the Quarter on the G-Tech this morning.

26% for trans loss? I thought it would be closer to 18% why so high?

We are using a Dynojet for our runs and was expecting around 400 in stock trim.

Perhaps the fact that we kept the car up was something the computer did not like.....

WIll keep you posted. BTW I am a fellow rider as well with a 2000 Hayabusa as my toy....

stephens

Yes 26% is way too high, however this is the figure the designers of the software for the Dyno chose to use. My understanding is from an engineering perspective, real losses are somewhere in the order of 12-13%, however each dyno manufacturer has their own ideas and baggage to carry. Apparently on the Dynojet you should expect 390-410rwhp. What is the build date on your car? If you have access, your ECU software revision might be handy(your dealer can access this through DAS) to see if you have a different version of software causing the dyno problem. My software version is 113 153 3979.

My bike is on the dyno as I write, having a Power Commander installed with a dyno re-map for the ECU. The bike has the factory termi's and I have just got it back from having a Ducati Performance Bucci slipper clutch and race cams installed. It is putting out 137rwhp with the air fuel ratios running dangerously lean. Hopefully it will be topping 140rwhp tuned properly. I can't wait until the track season starts again ( it is currently winter in Australia ), as I have a few friends with GSXR 1000's that need spanking!
The 'busa is an awesome street bike. My brother in law recently bought a GSXR 750 setup for track work, I had to talk him out of the Hyabusa so I'd have someone to go to the track with!

Marcus Frost

That would be incorrect, I'm sorry to say. Automatic transmissions have a lot more drivetrain loss than manual cars. Drivetrain loss is a result of rotational mass and efficiency. To spin the gears in your trans, your driveshaft, your differential, etc all takes away horsepower before it gets to the wheels.

RWD cars with automatic transmissions such as the E55 lose a great amount of horsepower due to their torque converters and transmissions. If you've ever looked at MPG estimates between a manual and automatic from the same car the auto always consumes more gas, because it's transmission is less efficient than a manual - mainly because of the torque converter.

I'm not sure what size the E55's converter is, but people are saying they can brake torque up to 2500+ rpm without problems so it's probably a fairly large size. I'd say you guys are looking at around a 20% drivetrain loss.

For reference:

12-15% for a manual transmission, lightweight flywheel, lightened clutch, and possibly a carbon fiber driveshaft.

15-18% for a manual transmission, stock.

18-22% for an automatic transmission, stock.

22-30% for automatics with aftermarket "high stall" torque converters, and most awd/4wd vehicles (manual or auto).

Of notable exception is Audi and their manual cars with Quattro. They have extremely efficient drivetrains with very lightweight rotating assemblies. They're drivetrain loss is around 18%, even with AWD.

-m

stephens

The MB has lockup on all forward gears. It is one of the most efficient autos available.
The difference between the dynojet and Dyno Dynamics is the way the designers set them up.
I have at least a dozen dynos of 300kw cars on a Dyno Dynamics.They all range between 210 and 225kw most are around 220kw. This works out to about 26.5% transmission losses. From what I have seen (admitedly only on the Internet, nothing first hand) on a Dynojet the same cars produce 240-250kw with most around 245kw, which is around 18% transmission losses.
These numbers have nothing to do with the real frictional losses in the car.

awiner

That is you ECU part #. The hardware version should aslo be on the outside of the ECU as well.

stephens

This is the number DAS spits out as the software version. I have a screen shot at home, I think, which I can post tonight.

blando

Apparently my earlier instructions only worked for MY2002...

https://mbworld.org/forums/sh...&threadid=46603