with my truck now running the 4x.014's, i'm only seeing 20psi max at what i believe is WOT. i believe i've heard that under stock fueling, these trucks are capable of 20psi. one thing i can think of would be to see if i'm reaching full throttle on the pump. if i am reaching full throttle, what could be the reason for only 20psi. i haven't molested my pump other than turning my fuel pin to the deepest side, but with larger injectors, i think i should be seeing at least a couple more psi. what are your thoughts?

my egt's are about where they should be. i didn't know what numbers to expect. but cruising about 45mph at 1750-1800rpm i was only seeing 600-700*. at highway speed approx. 72 or 73mph at 2300rpm they read about 800. if i stand on it in 6th up to about 2500rpm, they'd get to 1100*. so i seem to have enough air getting to the motor and could probably turn the power screw for a bit more fuel. no doubt the intercooler and 4" exhaust helps with the temps. i wish the old gauge was working when it had stock injectors and exhaust before i stepped up to the 4" and put the 4x.014's after the new head gasket. i would've liked to see the difference. oh well, at least i know i can't roast the turbo with my current setup. guess i'll have to wait to see what it reads when i can have a trailer/load behind me.

 

You should have more than 20psi, possibly a boost leak somewhere. I have the Stage II Pin, Stock Turbo, 4" Exhaust, and Banks IC, and I get about 22psi. Check all the intercooler couplers and make sure they are tight.

 

i'll check all my clamps. hopefully a few are just loose. i'm also wondering if maybe my boost tube could have started to kink somewhere and it's holding back some pressure? i would guess that could give an improper reading as well.

 

egts seem hi, boost too low, as stated,check for boost leak.

 

checked all the boots and the clamps are tight as i could get them with a nut driver. i guess the next step would be to pressure test the i/c??

 

Use a 1/4" drive ratchet or a 3/8" drive stubby. A nut driver will not get them tight enough.

 

You also might want to check the intercooler boots themselves for leaks. Roll them between your thumb and forefinger like you're rolling a smoke and feel for dry-rot and/or cracks and holes.

 

My intake manifold gasket was blown all out on mine along with a leak in the intercooler.

 

You could also check to see if your getting full throttle.

 

If the boots are the original stock boots I would just replace them. Mine started leaking within 5 years of when I bought the truck - new in 1993.

Bob

 

ya a leak mine makes 36psi on the stock turbo

 

just to clarify...the only mods done to my truck are as follows:

fuel pin at it's deepest side
4x.014's
banks (i think) intercooler kit
4" turbo back
low psi piston LP

i haven't tweaked on the pump yet but i should see more boost with the larger injectors period. i'm going to check for full throttle and replace the boots just so that i know they're new. if i'm still seeing 20psi, the intercooler will get pressure tested.

 

oh you havent touched the pump that would make more since then

 

Mine with the stock charger, POD's (4x14's), ground pin, pump cranked, 1/8 timing, 4" turbo back would hit 40psi beating the bejesus out of it.