Stock Rev Limit
09-29-06, 03:14 AM
#1
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Stock Rev Limit
Hello,
My cousin is having issues with his car being able to surpass the stock rev limiter. The only thing that comes to my mind is a faulty knock sensor. He will be repairing the issue soon but in the mean time I would like to know for general knowledge what the stock 13B can rev to safely, also when does the power start to decline. His turbos hold stock boost all the way to redline. Thank you all in advance.
My cousin is having issues with his car being able to surpass the stock rev limiter. The only thing that comes to my mind is a faulty knock sensor. He will be repairing the issue soon but in the mean time I would like to know for general knowledge what the stock 13B can rev to safely, also when does the power start to decline. His turbos hold stock boost all the way to redline. Thank you all in advance.
09-29-06, 11:36 AM
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Originally Posted by BobfisH
What do you think the redline is ?
My cousin informed me his car is allowing him to surpass the stock rev limiter. He claims his turbos hold stock boost all the way to redline and past.
Last edited by 7THSIGN; 09-29-06 at 11:51 AM.
09-29-06, 04:25 PM
#5
IIRC (it has been a long time since I had a stock ECU), the stock rev limiter is 8200 or 8300 RPM.
The knock sensor seems very unlikely to be related to the issue. Might the car have a "chipped" ECU where the rev limit was removed? Or maybe there is some problem with the test conditions, tach, or perception of what the engine speed is. Describe the conditions where the car was able to rev past 8500 RPM.
Many cars don't have rev limiters. Some cars have no rev limiter and no tachometer! And yet, people have been able to drive these vehicles without overrevving them. Your cousin should be able to drive his car without the rev limiter.
Many drag racers shift below the redline for maximum performance on FDs where the engine has stock ports. The power starts to drop off right after the peak, just like every other engine. The best shift point is at the speed (vehicle speed, MPH, then work backwards to find RPMs) where the torque at the wheels in the current gear drops below the torque at the wheels in the next gear.
-Max
The knock sensor seems very unlikely to be related to the issue. Might the car have a "chipped" ECU where the rev limit was removed? Or maybe there is some problem with the test conditions, tach, or perception of what the engine speed is. Describe the conditions where the car was able to rev past 8500 RPM.
Many cars don't have rev limiters. Some cars have no rev limiter and no tachometer! And yet, people have been able to drive these vehicles without overrevving them. Your cousin should be able to drive his car without the rev limiter.
Many drag racers shift below the redline for maximum performance on FDs where the engine has stock ports. The power starts to drop off right after the peak, just like every other engine. The best shift point is at the speed (vehicle speed, MPH, then work backwards to find RPMs) where the torque at the wheels in the current gear drops below the torque at the wheels in the next gear.
-Max
Last edited by maxcooper; 09-29-06 at 04:31 PM.
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