Want to pick your guys' brains for a minute, heres the scoop:

Car is a 2003 e55 AMG. Car has:

-Longtubes
-Fabtech intake pipes
-Mclaren SLR Cams
-Mclaren 82mm Tb
-X-pipe+borla mufflers
-172mm Crank pulley
-83mm Supercharger pulley
-EC TCU/ECU tunes.
-Heat Exchanger
-Upgraded I/C pump

I am using a gates belt. Forgot the size. Will have to check.

So heres my issue. Recently had an incident with a jack. I had a massive coolant leak from somewhere. Car had slipped off the jacking point. So, knowing I had a giant leak from somewhere, I filled the car back up with some extra coolant, and turned the car back on. No leaks. So, I filled it all the way back up. Even with the system pressurized, no leaks. Drove the car for an hour. Nothing. I was lost. Drove it to work the next morning. Nothing.

So forgetting about my mystery leak, I decided it was time to fix the car up a little with some of the parts ive had sitting. (Mostly because I lost $100 to an evo from a dig.) Either way, we installed an 83mm clutched super charger pulley, and I replaced the S/C belt tenisoner pulley with a billet one. Also changed out the serpentine belt.

Next day, brought the car to the track to practice my 60fts. Was letting out right after the 1/8th. Busted an elbow to my radiator. (assuming the hard launch on DRs, plus the 14 year old plastic brittle POS didn't quite add up) and it broke. Fixed it at the track.

Drove the car to work the next morning, finally, my coolant leak showed its ugly face. Got the car back to the shop, put it on a lift, pressurized the system, found the leak.

Ordered a radiator. Shows up yesterday, we install it. Coolant level is fine, bled the system, yadda yadda. So we go take the car out for some test hits.

Right around 5500, the car just loses TONS of power, but once it shifts, all the power comes right back.

Open the hood, we notice my s/c pulley tensioner looks a little "whacked." Like its causing the pulley to sit on an angle, because we also noticed the belt was jumping a few ribs.

We also thought the shifting issue might have been from us pulling the trans cooler lines, and I lost a bit of fluid. Checked it, little low, added a quart and the level was perfect. Still had the same trans issue.

Puzzled still, I did the ECU/TCU reset this morning as well, and still have the same issue. Heres my actual questions.

1. Would my car lose that much power if maybe the belt was slipping? I'm merely guessing that maybe when it gets into the higher rpms, that since the s/c tensioner is on an obvious angle, that its moving my belt over, and causing it to slip. Then maybe once the car shifts, it pops the belt back over? Because once this happens, I pop the hood and the belt is jumped over a few ribs.

2. I was also reading that if your ambient temperature sensor is busted, it can cause the car to go into limp mode. Well, mines been busted off for like 3 weeks (ordered one fro ecs and it still isnt here) but, even with that gone, I still ran 11.4@120 without the 83mm s/c pulley. So I highly doubt that has anything to do with it.

Car drives perfectly normal. Shifts perfectly normal. Everything besides that is fine. My CEL is on for my rear o2s, but I don't have STAR to check if I had any other hidden codes. Which kinda sucks.

Am I just over-thinking this? I just find it odd that even if the belt was slipping, it would die off that hard, but then as soon as the car shifts, I have full power again.

Anyone? lol

 

Since it's happening above 5k RPM... I'd agree with you on the belt slipping...

 

Would also like to mention I do have a wideband in the car. AFR WOT is right at 11.8-12 in the lower RPMs, higher up drops a little to 11.6-11.5. Id figure if it was actual limp mode the AFR would be toast. But I also feel like if the belt was slipping that bad it would lean out?

 

Bump.

Swapped the stock super charger pulley back on. Same issue. I am also noticing a lot of belt residue building up on the tensioner pulley.

 

Anytime I had belt slippage it felt like supercharger turned off ,period.on data log you can see boost nosedive but engine rpms still climb,instant E500 lol

 

I need a way to log this thing. Maybe ill try the torque app tomorrow from a buddy. See if I can atleast narrow it down some. I bought an EC cable from a buddy, and the damn thing does nothing because apparently it doesn't recognize my vin. AKA, I'll probably have to pay euro-charge to help me get it working.

 

Also, were your AFRs changing as well?

 

If your belt jumped, you have a problem somewhere. Fix that first.

 

Figured the belt jumped, because the belt I'm using is a fuxing 53" belt. Not a 51. Plus the tensioner seems loose. But, the car was still pulling fine with the longer belt with the stock super-charger pulley. The belt jump issue is now gone after swapping the super charger pulleys.

 

Found it. Poverty intake couplers were collapsing, and the s/c was shutting off.