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Lost power at Wot


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Today while driving in first gear i floored it and somewhere between 6-7k rpm there was a loud pop(maybe from exhaust?idk) and I lost power going to the wheels and there was no exhaust noise either so i quickly put it in neutral. It pretty much felt and sounded like if i had pushed in the clutch at high rpms even though i didnt. I let it coast for afew seconds then put it in 2nd gear to make sure i didnt blow up the engine. So now in second gear its drove fine i just got a slight burnt smell. The rest of the way home it drove normal but i was scared i messed something up because this has never happened before. Should i go to a shop and get it checked out or does anyone have an idea what might of caused that to happen?

 

car info:

93k miles

Stage 2

Cobb accessport

Stock clutch

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No check engine light. car ran perfectly once i put it back in gear but just had alil bit of burnt smell

 

I had a burnt smell for the longest time, cv grease in the downpipe. Start by figuring out where the smell might be coming from.

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Are you still making full boost? Any whistling, whooshing, or howling sounds when more than 50% throttle? If so, you blew an intercooler connection off and just need to reset it.

 

I just went stage two and I've had two occasions so far where I've heard a loud pop at full throttle and then full power died off. Afterwards, I couldn't make full boost anymore and I could hear the whoosh coming out of the engine bay. The first time I blew the connection off at the intercooler. The second time I blew it off at the throttle body. Good luck.

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Sounds like this is what happend. I didnt know this would happen i thought all cars just did the rev bounce thing

 

Hang on, I might be mixing myself up...Crap, sorry.

 

I think you're right. I'm confusing the fuel cut that occurs during overboost (the cut lasts longer) with the rev limiter, which also is a fuel cut but it makes the rev bounce like you said.

 

Hmm.

 

You're 100% sure the car is running like normal now?

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Are you still making full boost? Any whistling, whooshing, or howling sounds when more than 50% throttle? If so, you blew an intercooler connection off and just need to reset it.

 

I just went stage two and I've had two occasions so far where I've heard a loud pop at full throttle and then full power died off. Afterwards, I couldn't make full boost anymore and I could hear the whoosh coming out of the engine bay. The first time I blew the connection off at the intercooler. The second time I blew it off at the throttle body. Good luck.

 

I havent drivin it hard since that day but im gonna try it out in abit and see how it sounds. I have spt intake which is pretty loud so itll be hard to hear any abnormal noises so ill just go by the psi levels

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You really shouldn't be usnig that intake at all. It's pretty crappy. It has turbulence issues which upsets the MAF readings. Compound that with your COBB Stage 2 map which has a tendency to knock a little bit and well... all sorts of fail everywhere.
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If you have a boost gauge, that'll tell you for sure. If you can make full boost, you probably don't have a boost leak. If you can't, check the intercooler connections first. Don't romp on it more than you have to in order to determine if there is a problem and where it might be.

 

By the way, a boost leak problem will drive pretty normally when less than 0 psi (i.e. half throttle or less) and won't be readily apparent until you try to make boost. Then depending on the size of your leak, you will make between 0 and full boost (~18 psi @ stage 2ish).

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So i just got back from a 20min drive. I do have a boost gauge and it seems to be boosting normal at 15psi(cobb map). I did a few wot runs mostly shifting a 5k but did shift at 6k twice. Everything felt good. I thought i heard a weird noise like tire against plastic type of noise but i could just be hearing things that have always been there. im at stock height so it wasnt the tires
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