WOT high RPM problems

crookedlegTEG · Post by **crookedlegTEG** » Thu Oct 01, 2009 7:36 pm

I have been having a problem the past week or so with my car. I have the S300 in my 94 GSR that is boosted @ 9psi. the engine is fully built with Darton 84mm sleeves, 9:1, 450cc DSM injectors, and stock head. I have been having problems with going into vtec at WOT. It just stops making power and reving at 7000rpm, almost like it is hitting revlimit. It was doing it before at the drag strip at 5000rpm. I reloaded my fuel maps and the problem went to now 7000rpm. Checked all the parameters and they are all ok. Rev limit is set at 9200 rpm.

What could cause this?

allm0t0rGSR · Post by **allm0t0rGSR** » Thu Oct 01, 2009 7:49 pm

try check yur oil level and add a little bit than normal level....i know this becaused it happen to me b4 my oil level was low so it wont let me go to hi cams which is my vtec point....

crookedlegTEG · Post by **crookedlegTEG** » Fri Oct 02, 2009 6:12 am

True cause of the oil that the turbo is using. I will check that today after work. Thanks.

Also has anyone heard of the stock GSR manifold IAB secondaries not being any good for boost. I know they work off of vacuum on the diaphram to open them, but since I am boosting the engine and there is little vacuum present at full boost in the intake manifold to pull the diaphram open?

kinetics · Post by **kinetics** » Fri Oct 02, 2009 6:33 am

Just remove the IAB, and cap off all of the vacuum lines, and pull the butterfly valves out (there's plate sandwiched between the two halves of the manifold, you can just unscrew them), and run it w/the secondaries open all the time.
You lose a little low end torque, but your high end flow will be much better.

This could also be contributing to your problems at 7k.

crookedlegTEG · Post by **crookedlegTEG** » Mon Oct 05, 2009 6:20 am

Well I figured out what the problem was. The vacuum lines to the FPR, WG, BOV, and the IAB's. I didn't have the WG line connected to a boost sensing port, I isolated the FPR and IAB lines by themselves like they are stock, and connected the boost sensing port on the BOV so it would operate faster. Thanks for all the help guys