Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - new build feels under powered
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Old 09-14-2012, 05:05 PM
lmsport lmsport is offline
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If it wont rev up past 4kRPM:
1) running out of air due to turbo/intake air limitations
2)restricted exhaust
3)running out of fuel for any number of reasons
4)mechanical problem in valve train due to loss of valve control, usually a spring problem

I have a car in the shop with the first PP TBI system I have touched. The edit software is kinda clunky, and this car refuses to run the same for 5 minutes at a time. It also has the PP Fuel on Demand returnless pump setup.
I think that an A/F of les than about 12.0 is going to cost you horsepower, plus you cant count on the O2 to respond like a dedicated A/F gauge is capable of.
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