yesterday i swapped out my injectors, a smaller pulley for my powerdyne and a new pcm from pcmforless that was programmed for it. the car drives fine, except at wot past 4,000rpms there is no power at all, it almost feels like the fuel cuts off. should i have this thing dyno tuned? does it only sound like a programming problem? thanks

 

I would have to say yes, a dyno tune will monitor fuel pressure, boost pressure, rpm's, timing curve, injector pulse, it will cover everything to make the tune right and do no damage to your engine.
with it falling off at 4000 rpm's something may not be set right or something may not be working right to keep up with everything else.
it could be the tune, it could be the fuel pump, it could be knock, it could be torque management kicking in, or other things, with out it being hooked up to monitor the system while it is working their is no telling how to pin point the problem and fix it.

 

I would suggest a dyno tune......There is a place in Chatsworth, PM me for the number !

You may be bangin the knock sensors with the added boost.

 

so you guys think a dyno tune will solve my issue? i dont think the fuel pump is the problem, im only running 9psi. what tune are you using pappy?

 

Maybe belt slippin??????

 

no belt slippage

 

the fuel put can be your prob. when you go with more boost, you need more fuel. just because your injectors are asking for it, does not mean your pump can supply it and vice versa. allan futral ran into this same prob. when he dynoed my truck. dyno tuning your truck will let you know what going on though.

 

thats what the problem is