The hard part is that Dans truck is cursed.We spent a ton of time on it fixing stuff you wouldn't even dream of. I drove the truck 140 miles straight without 1 problem,then Dan would take it home and the truck would turn to crap.Something was screwed up.
Now,the truck was shipped to W2W and they pretty much started at the beggining again like I did.Probly got it running good then it turned to crap again.There is something electrically wrong with it. The sad part was I already had a good start on it,so if I got it back it probly would of been fixed by now.Well, maybe not

 

I'd say take it down piece by piece and start over again. with the same parts just installed by better people. That's what I plan on doing with mine if it doesn't work this time around. Pull the engine out...put it on a engine dyno for a few hours, pull the tranny out, put it on a tranny dyno for a few hours. Refurbish the turbo and put it back together with a new harness. Had I done a long time ago I probably would of save alot of money from where I am now!

 

Welll...hate to disagree, but at some point u have to believe its just not meant to be! Sell it, or leave it on the hiway and start over again. I've watched and been involved in every step of this latest rebuild, and if this doesn't work its back to the 5.3/Radix set-up and I'll have a $25k paperwght in my garage.

 

The biggest problem is having multiple shops work on 1 vehicle.It leaves way too many variable's and possible problems.We've been lucky enough to never have problems like these when we build the vehicle from the beggining.

Now when we get a problem vehicle it is torn down.Just finished a 00 427ci Camaro that a shop tried to build 3-4 years ago.The owner could not drive the car over 30-40 miles without it breaking down.We tore out the whole driveline,rewired the engine bay,checked over every part of the motor/driveline,replaced what we had to and put it back together.Car has 400 trouble free miles so far. It was expensive but in the long run probly cheaper.

 

i love all of the replies. lots of questions that I cannot personally answer but now at least i have things i can bounce off of w2w when they get back from break.

i'm thinking: call FI and give them ths turbo specs to see what they think. (precision says its not a good setup for the truck) Pull the turbo off the truck and have it inspected. If it is deemed worthy, fix it and put it back on. Also, have the intercooler inspected. drain anything that might be in there and/or replace the intercooler if it is deemed junk.

Then, if those 2 things don't fix it, light it on fire and laugh my ***** off when it burns to the ground, lol.


on a positive note, they did say other than the boost/backpressure issue, it has been running da bomb. no more exhaust leaks, no more coilpacks melting, all plug wires have been redone, new efans installed, eboost rewired cause it was severly f'd up. etc

Turdo-Zone rocks baby

 

Why do you think there is something wrong with the turbo?... even if it had a very small P trim wheel with that 1.2X A/R hotside I dont see why you have 30psi of back pressure.. 30psi of backpressure isnt the Problem.. The problem is it has 30psi of backpressure with only 6psi reading in the back of the intake... The Problem is where is all your Air going???

 

I've read through these posts multiple times and faild to see that you had an eboost controller on your setup...did you guys ever put the manual controller on and see if it worked ok without the eboost? It might be wired correctly now, but may still be causing problems if it's not setup right or if the solenoid assy is acting up.

If I had f-u money I'd buy your truck Dan, just to save you the headache and give me something to do...

 

Eboost2 - A very common problem, there is an overboost protection setting on it that comes from the factory set around 6-7 psi. That has to be raised to a point higher than you are wanting it to run. That would be the FIRST place i'd look.

 

The was i understand it we really are dealling with 2 issues here:

1) the truck won't hold over 6lbs boost

2) at 6lbs boost it makes 30lbs backpressure


so far we're looking at:

-the turbo to make sure it's in tact(not damaged by the bolt found inside it)

-the intercooler to make sure it's not clogged or leaking

-the air filter and elbows to make sure they aren't collapsed

-the eboost2 to make sure it is programmed right(though this wouldn't cause the backpressure issue i don't think)

-might as well inspect the wastegate and bov right?

Any other suggestions? for what it's worth the wastegate is i think 50mm and has the 6lb spring in it.

 

Funny thing, I had the same problem and it was bad valve springs.