[ykdave]

my truck was the same way even before i bought it. It didnt really have much of anything for power and had a hard spot in the throttle and just like you, when you push past it it didnt do anything. mine actually felt like it slowed down when it was floored!

I cant say exactly what it was, but i slid the stock plate forward and afc forward and it was a whole new truck. all kinds of power (compared to before) and didnt have a hard spot in the throttle.

Either way, ya cant go wrong with a plate!

 

[Dual K20s]

That hard spot is compressing the spring in the gov as the governor arm hits the plate or AFC arm. Sliding the plate or adding a more aggressive plate will move that closer to the floor.

15psi is low, I'd check the freshness of the fuel system, and look for boost leaks. Stock should be more like 20-25psi.

Adding the #10 would help with the power and a gsk really helps between shifts. Careful with a stock tranny though

 

[ykdave]

15psi is pretty low, but mine was the same way. 15-20psi flat out.

It takes fuel to spool the turbo and i know in my case the fuel just wasnt there. After the first couple light mods (stock plate forward, afc forward) it would move enough fuel to hit mid 20s. Then with the 100 plate (and now my 0) its got no problem burying the boost gauge if ya dont let up!

 

[K204DR]

I forgot to mention we slid the plate all the way forward a few weeks ago. only had 1/8th inch to go, which I thought was wierd, since it still had all the factory breakoff screws intact. didn't feel any gain from it.
I can get 25psi if I stomp it in everyday driving. the wastegate is locked shut for now, the diaphram was missing on the turbo I got, so we made a spring(brakespring) loaded arm to hold it, and since its stock it hasn't pushed it hard enough to need to open. got a new housing and diaphram on the floor waiting to swap in.
the trans has been rebuilt but is stock as far as I can tell. figured the #10 plate would be about the max for it, got a temp gauge to add to it soon also.
I've loosened up the spring in the afc alot, and adjusted the allen screw behind it, it'll blow black on takeoff if I want, do I still need to move the afc all the way forward? don't wanna kill the fuel mileage if I can help it.

 

[Dual K20s]

The AFC doesn't affect power


Look for other problems first

 

[barracuda_440]

I replaced my fuel filter and it felt like a new truck haha, i guess the owner before me didnt think to change it often.

 

[K204DR]

yep been thru the fuel system, new filter, cleaned the screen, new return valve, all fuel hoses are new.

 

[CoreyE]

how often do we need to replace the fuel filter? i did it a few months ago and its starting to feel a little slugish again.