tscales

I'm having fun running at the local 1/8th mile track with my 2005 SL65, but after just a few runs it slows down measurably.

I have the Torque app and it is showing IATs of 210+.

Seems awfully high, but I have no idea what is normal.

Do I just live with it, or do I need a new pump.

Any other ways to keep it cool?

Thanks!

BlownV8

Speedriven intercoolers with trunk mount tank to increase coolant capacity and so you can add ice to the coolant for some sub ambient IATs. That's what I have on my 600.

tscales

More than I'm willing to spend. I'm most interested if the temps are normal, or abnormally high.

RaceHorse

I have managed just fine with stock intercoolers and haven't ran the 1/4 with my trunk tank, but I'm sure it's helping with everything else I have done. In order to keep temps down, remove the engine cover at the track and put a large garbage bag filled with ice on the intercoolers between passes. Let the car run a few minutes after your pass. I try to do 30-40 mph on service roads around the track. This will allow you to take some of the heat out of the I/C system and the engine as well. It's a minor prevention of heat soaking the system from the engine and turbos. Then park, pop the hood and place the bag of ice on top of the intercoolers. After 10-15 mins turn the key to accessory so the pump can run and circulate the cooled coolant out of the intercoolers and warm water back in. Then leave the ice in place for addtional cooling. If you haven't already wired your pump to run all the time, it would be a good idea. If your pump is dead, then none of what was mentioned will help. Bring fans and a generator helps, but its a much bigger commitment to racing. A simple add, not temp related, is pulling your airfilters. It will help the car breathe a little since the stock airboxes are really restrictive. Hope that helps.

m-svt-amg

Have you tested the pump?

Id upgrade it either way.

tscales

What's the best pump upgrade for an SL65?

m-svt-amg

Nick did a long bench test study and thread somewhere on the forum. The result was: match the pump to the system and aim for as much flow as possible.

I think the cwa100 is probably the best, but i think the cwa50 is good enough for most mild mods on the 55. The updated bosch is fine for stock 55s but i would expect youd want more flow for a 65

Welwynnick

Have a look at the thread below.

The thing that really hurts the IC is parking the car with a hot engine. That's when it really heat soaks. It takes a LONG time to cool down afterwards.

The best pump is the EMP WP29, but the Pierburg CWA-50 is a good bet.

Nick

tscales

WAY over my head. Assuming I wanted to go with the WP29:

1) Where would I get it?
2) What's the complexity of replacing the stock pump?

I have a good indy, but doing things other than stock may not be his strength.

m-svt-amg

My indy has had a hard time with the SL to be honest... but it only took him about an hour to put my CWA 50 in, fits in the stock location.

wlelandj

RaceHorse- Did your trunk tank come with a pump? Are you using dual pumps or just the trunk tank one (if it came with one)? My tank came with the pump and I had a Meziere to be installed, but the shop said I only needed the trunk tanks. They felt the Meziere would cause cavitation.
-Leland

RaceHorse

I have a Rule 2000 pump in a custom 6 gallon tank that I had made. It's designed with the ability to be removed from inside the spare tire and the system can run off the Meziere up front. I have not measured the flow to determine if they have an adverse effect on one another by running simultaneously. The Rule 2000 was ideal for fitment reasons but does give off some heat that is absorbed into the coolant. Together, after a hard mile at WOT they melt the ice, I can see the water circulating very well at all times. There may be pumps that have proven to be better performers, but I feel my setup works very well with stock intercoolers based on my personal results. Not much basis for comparison, but my setup gained 11 MPH for the last half of the 1.5 mile pass in less than 10 seconds. Its probably the hardest you can push the car, requiring maximum intercooler efficiency.

wlelandj

So you have both working in tandem, correct? I think the pump that came with my tank is the same. So no problems running both? I tell ya, between that and the KC...
-Leland

tscales

I was just measuring IATs on a leisurely ride around town and they're hovering around 190. That seems too high. I think the pump may be shot.

RaceHorse

Yes, I have both pumps running at all times, wired to run when key is on. As for temps climbing, I think an additional heat exchange is a must for a car with a tune. Larger intercoolers may pull heat out, but once the circulating coolant temps go up, it doesn't matter how good the pump is the stock heat exchange becomes overwhelmed. Stock you can feel the car heat soak. The killer chiller may be the answer in keeping circulating temps down, depending on the frequency of hard pulls and outside air temps.

AMG-Driver

Interesting that someone with a tuned CL65 has some High-Speed acceleration data. How much seconds did it take for you from 189 MPH to 203 MPH (when I remember your 1 mile and 1.5 mile record correctly? I have a video of my SL65 to compare with GPS measured on even road from 270 KM/H flat out to 337 KM/H = 167MPH-209 MPH

RaceHorse

I don't have any real acceleration data, other than simple math. They only clocked MPH at the 1 mile and 1.5 mile marker at the speed event I attended, no timing. I should get a Vbox one of these days.

Since 180 MPH=3 miles per minute, 1 mile in 20 seconds, so a half mile is 10 seconds. I did the mile in 189.xx MPH and 1.5M at 200.xx MPH. The difference of 11 mph had to occur in less than 10 seconds since it would take 10 seconds flat at a constant speed of 180 MPH. I began at a higher speed and continued to accelerate.

I was sharing to show that the inter-cooling system I have in place operating with 2 pumps seemed to be sufficient and melts the ice in the trunk tank. I didn't mean to go off topic, but share the video with a new post, it would be cool to see.

AMG-Driver

Hi, thats a nice math example. I was at a restaurant this evening and had a view drinks with my wife so maybe it is better to make the calculations tomorrow... It would be a lot easier with times to compare. But I will open a new thread in the SL section, to show my SL65 flying at night on the German Autobahn. Have a nice day!

Dr Matt

I'm trying out the killer chiller as a solution to high temps around town and at the track. This summers time slips shou show if it helps.

At the track I have been runing my pump non stop from the first pass of the day until racing is done (wired in a switch). I take off the engine covers, and between passes I have a fan blowing air through the radiator and a box fan sitting on the motor blowing air on top of the engine with the hood open. My IAT's are below 120 when I launch and still below 120 after a pass with my cool down procedure. I hope to be able to hot lap this year with even cooler temps.

tscales

just to confirm, these pumps are for a 65? There was some confusion as the thread veered into 55s.

B Feelgood

Is the EMP WP29 plug and play or does it require fabrication to make it fit/work on an 05 SL65?

m-svt-amg

Are you the same dr matt from nloc and lightningrodder?

You were the reason i run m&h tires haha

Dr Matt

Yep, That's me. Sold the L when I bought the CL. The M&H's work amazing on a L for street duty. I wish they came in a size I could run on my CL! The M/T's work better at the track, but nothing hooks cold on the street like the M&H. And they wear excellent for a D.R.

Should have some track results after Memorial weekend with the Killer Chiller too.