SS2Z06

I have a 2006 sl65 with a tune from eurocharged (stage 2) along with a tcu from speedriven. The car has a brand new heat exchanger pump from mercedes (warranty replacement). I drove the car horribly at the track and understand that is why I was running between 12.2 and 12.6 (my best 60 ft was 2.2). What I don't get is why my best trap was 117. I got that once where I repeatedly got 114mph traps. (about 10 passes) The car will be going on a dyno in a few weeks to check the tune but I am confused. With the horrible traction I would expect a higher trap than usual. This car should be fully capable of low to mid 120 traps. Any suggestions? I thought it could be a IAT issue but like stated the car has a brand new pump. It was ideal conditions. The day was a peak of low 70's. I'm looking forward to the input of others. TIA!

Viet_Amg408

get ur 60ft under 2.2..

Tech-Tune

I agree with Viet AMG408, but the MPH does seem low given the moddifications.
I would start with a dyno to see if its a tune-related issue.

SS2Z06

Yes, I agree about my 60 ft's but that is reflected in my et. My mph being low is my concern.

Benz-O-Rama

Correct. Your 60' will not have any affect on your mph. Stock SL65s generally trap 117-120, with modded 65's trapping closer to 125. My tune only SL600 trapped 121-122 at our last track rental. Sounds like your car is pulling timing on the big end. What was your 1/8mile MPH? That will tell us alot in this case.

I'd wager that your I/C pump is bad, even though it was just replaced. Or, they didn't properly bleed the I/C circuit, when they intalled your new pump.

114 mph is pitiful for a modded 65.

SS2Z06

My 1/8 mile ranged from 89-94 mph. Should I try bleeding the system or would it be advisable to upgrade the pump? What about upgrading the heat exchanger?

Benz-O-Rama

Your 1/8th mph should be aroun 95-96 on a stock 65, so you're a bit short there too. Silly question, but track temps weren't unseasonably high, were they?

I'd hold off on upgrading the h/e because you're not even running stock mph yet. I'd have the dealer bleed the system and check the pump.

A quick a dirty way to see if your pump is workin is to bring the car up to temp, and have it idle. Press the schrader valve at the top/rear of
the engine and see of coolant shoots out.

SS2Z06

No, actually temps were great. Low 70's. I'll try the schrader valve and see if it works.

SS2Z06

Update....I checked the schrader valve and fluid came out both and it was cold which I'm assuming is good?

Benz-O-Rama

Make sure it spits fluid when hot too. Checking the shrader will only tell you if the pump is working, not really how well it's working. Your symptoms sound like classic heat soak. My gut feeling is that your pump is bad, but there's a slim possibility its the tune. Doubtful, but possible.

When you got the tune done, did your car 'feel' faster to you?

Since the dealer just replaced the pump, I'd start there first. Why did they replace it, anyway? Was it to troubleshoot this exact issue?

Happy2th

Have you checked for a boost leak?

I was running 113-114 mph at the track last weekend....... This thoroughly disgusted me as the car has ran 124 mph in the past. I opened the hood and noticed that the dealership that had recently done work on the car didn't tighten two clamps on the boosted side of the driver's side intercooler.... I tightened the clamps and immediately ran 120 mph.

Might check all the clamps.

Benz-O-Rama

Did your boost leak throw a code or a check engine light?

SS2Z06

When I checked the schrader the car was hot but the coolant that came out was cold. I figured it would be warm if not hot. should it be cold? the pump was replaced due to lack of power. the car did feel faster after the tune. either I quickly got used to the power or it now feels almost stock again. as far as a boost leak, other than visual items is there a way to tell?

Benz-O-Rama

If the engine was hot, and the coolant was cool, it sounds like the pump is doing it's job.

Hmmmmm, I wonder......

When the dealer replaced the pump for "lack of power", is there any chance that they reflashed your ECU? Many times, one of the steps for dealers to diagnose/repair power issues, is to reflash the ECU to their latest and greatest.

Jerry will retune your ECU for free, so it might be worth it to send it out to him, and let him take a look. He'll be able to tell instantly, if it has his tune or a stock tune on it.

Philly Single

Running into a similar issue, but will start my own thread. I'm barely trapping 119mph on a Speedriven tune (run was 11.82 @ 118.8). I've logged the runs:
Boost: Peaked at 22.68psi, bottom of 3rd gear and trailed off to 16.38 at the top of 3rd.
IAT: Peaked at 127.4F at the end of the run.

I even flashed the car to stock and logged to make sure the tune was "working", I confirmed that the tune did in fact raise boost and was accepted by the ECU.

Only thing haven't checked yet is Fuel Rail Pressure...that was Marcin's suggestion. He said the static FP should be 60-61psi. If that's low, obviously, it'll rob HP.

*edit* why bother starting a new thread...I have an S65, but we share motors...

SS2Z06

That's a good thought but the car was stock when it was at the dealer. The tune was done after it left there.

the head

Where were you at - elevation wise? How long did you wait in between runs? It would be nice to see if you could see the timing as well. I had a similar issue with my Cayenne turbo and Jerry's first attempt to tune. Turned out it was a less than stellar tank of gas. After getting a couple of fresh tanks (at another station) he was able to get the power out of it. The program was just simply doing its job to protect the engine. Might be worth doing the same and throwing a couple of gallons of race unleaded in there to see if it picks up.

SS2Z06

I was at sacramento raceway. I'm not sure of the elevation but it is quite low...thinking less than 100ft. My very first run which was my best was after driving 100 miles. Half of the runs were done back to back. The remaining few had maybe anywhere from 15-45 minutes in between. Jerry was going to come out this sat for a dyno day but not enough people showed interest. I wanted to get it on the dyno with him there to see. Hopefully this will happen soon.

Benz-O-Rama

Man....

I'm running out of ideas. So, we don't think it's the I/C pump, boost leak or just bad track conditions. We know the dealer didn't flash it back to stock, because ECU was done after it left the dealer for performance issues.

Wait....! You're stating that you had the car in for service, for what felt like a decrease in HP, before the car was tuned by Eurocharged? Did the dealer validate your claim and diagnose the problem, or did they just blindly throw a part (I/C pump) at the problem? What was the dealer's conclusion?

Honestly, I'd have Jerry flash your car back to stock with one of his remote tuners, and have the dealer successfully diagnose and repair your issue with a stock ECU file. Once your back to what your stock numbers should be, then have Jerry re-flash it.

What you don't want to do is keeping introducing new factors into the equation while troubleshooting. You'll end up just chasing a red herring.

You know....as I'm typing this, I just had an epiphany. You should PM user Marcus Frost, as I believe his SL65 also had a very mysterious loss of power. It took months to figure out, and in the end, it was something very simple IIRC. I'm having a hard time remembering what the issue was, exactly.

Either PM him, or search his posts.

Benz-O-Rama

I don't think this was the issue I was remembering but quite interesting, none-the-less

https://mbworld.org/forums/w211-amg/...-airboxes.html

Pay particular attention to post #15

the head

IIRC, my trap speeds dropped to 117 after back-to-back runs, but I have a stock tune. Probably a good idea to go back to the stock tune and see what happens. Was your 60' time high because of wheelspin with TC (traction control) off, or did you leave the TC on and let it handle things?

Benz-O-Rama

117 was his best trap while most of his traps were 114. There's something going on here, without a doubt.

Sunir

hmmmn sounds like a mysterious problem...BOR is on the case I think that with these cars they are so advanced that even the smallest detail gone wrong can lead to sub-optimal performance. Start modding and that adds more layers of uncertainty.

EXECMALIBU

When the numerous computers in todays cars see too much power, torque or even boost the computers will sometimes take control and back down timing or release the boost pressure to protect the engine/trans from damage. This was designed into the computer programs and some of these files need to be modified along with the tune for the performance upgrade. Many performance tunes are tested on the dyno at WOT during a warm day. But sometimes as temps get lower or throttle position change in real life driving applications sometimes causing problems to arise.

I have read about problems tuning numerous V12s using a few different tuning companies TUNED FILES because the ECU ,Traction Control and Trans Control see way too much power and the cars computers often FIGHT BACK and dial down the timing/boost. There have also been issues with part throttle applications where the computers think the boost is too high at a certain throttle position and this can cause the ECU to shut down momentarily.

In one 2007 S600 the owner said his car would run AMAZING when it was 75+ degrees plus ambient temp... But when it cooled down below 70 degrees and the air got thick the ECU/TCU would see too much boost and randomly and instantly open the waste gate causing the car to buck violently. The bucking would only happen intermittently sometimes three times in a day then no problems for a week or more then it would start bucking again out of no-where. Needless to say diagnosing the issue was very very difficult.

Blue_Monster

Whats in bold is your problem. Contact Jeremy @ OE tuning, and your car will be where it should be