Car wont rev over 5k rpm after a few sessions at the track.. Ideas?
#1
Car wont rev over 5k rpm after a few sessions at the track.. Ideas?
Hey guys,
Not sure where to put this but im hoping someone can help me out here. I did a track day today. 5 sessions in the car was driving fine. 6th Session when i pulled out it wouldnt rev over 5-6k rpm.. Felt really hesitant as soon as it got to that point. It sorta cleared up after a few laps but still wasnt revving anywhere like it use to..
When i packed up an drove home it was doing the exact same thing but worse.. just stopped revving past 5k as u can see in the video below.
Few specs about the car.
motor is an nb6 motor so it has crank and cam angle sensors.
its turboed with a 2871r making 330rwhp.
full 3 inch exhaust.
ls2 coils
1000cc injectors
um im not sure what else i can include but it anyone needs more info i can provide it. Unfortunately i havent had the chance to setup a good datalogging system yet.
Any help would be great.
Not sure where to put this but im hoping someone can help me out here. I did a track day today. 5 sessions in the car was driving fine. 6th Session when i pulled out it wouldnt rev over 5-6k rpm.. Felt really hesitant as soon as it got to that point. It sorta cleared up after a few laps but still wasnt revving anywhere like it use to..
When i packed up an drove home it was doing the exact same thing but worse.. just stopped revving past 5k as u can see in the video below.
Few specs about the car.
motor is an nb6 motor so it has crank and cam angle sensors.
its turboed with a 2871r making 330rwhp.
full 3 inch exhaust.
ls2 coils
1000cc injectors
um im not sure what else i can include but it anyone needs more info i can provide it. Unfortunately i havent had the chance to setup a good datalogging system yet.
Any help would be great.
#12
Elite Member
iTrader: (15)
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,847
Total Cats: 27
I have had those sensors fail on a NB and it caused me no end of pain trying to diagnose it. The problem comes and goes with heat, so it can mimic a tuning issue. Replacing the sensors fixed the problem.
#13
Elite Member
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,979
Total Cats: 356
This is actually shocking easy to diagnose with the proper ECU.
I had one case where a car would misfire above 2500rpm or so, but randomly. Using TunerStudio, I was able to see that there was a problem with a specific tooth on the trigger wheel. I described to the shop exactly which tooth was missing at certain moments, and they found out that the trigger wheel was bent a few (1.5) millimeters (something your eye wouldn't normally catch). They flattened the crank wheel and all was good again.
I had one case where a car would misfire above 2500rpm or so, but randomly. Using TunerStudio, I was able to see that there was a problem with a specific tooth on the trigger wheel. I described to the shop exactly which tooth was missing at certain moments, and they found out that the trigger wheel was bent a few (1.5) millimeters (something your eye wouldn't normally catch). They flattened the crank wheel and all was good again.
#14
Update with this:
So went down and swapped over the sensors in anticipation for a bit of highway racing tonight. So i could test and see if it still did the same thing. Swapped them in and set the correct air gap on the crank sensor and went for a drive. Did not rev over 6k rpm. A bit surprised i went back and fiddled around to see if i could get it better and nothing.
Started driving back home only to have the car **** itself and had not throttle at all. Pulled over and tried to start the car and nothing. Went and swapped over the old sensors hoping it would fix it and it didnt. Still didnt work.
So question is what went wrong. We managed to get it starting but as soon as u press the accelerator it dies. Only thing i changed was the sensors.. Thoughts ?
So went down and swapped over the sensors in anticipation for a bit of highway racing tonight. So i could test and see if it still did the same thing. Swapped them in and set the correct air gap on the crank sensor and went for a drive. Did not rev over 6k rpm. A bit surprised i went back and fiddled around to see if i could get it better and nothing.
Started driving back home only to have the car **** itself and had not throttle at all. Pulled over and tried to start the car and nothing. Went and swapped over the old sensors hoping it would fix it and it didnt. Still didnt work.
So question is what went wrong. We managed to get it starting but as soon as u press the accelerator it dies. Only thing i changed was the sensors.. Thoughts ?
#15
Did something done blown up? If you have the ability, try re-flashing the haltech. I've had the sport 2000 just get stupid and forget parts of the tune before. Literally, car runs like crap, connect to computer, "what the **** is this garbage, this isnt my tune" then re-flash and it was all good.
Thread
Thread Starter
Forum
Replies
Last Post
JesseTheNoob
DIY Turbo Discussion
15
09-30-2015 02:44 PM