I have been experimenting with the stock turbo, and I think I have discovered something that has never been mentioned before.

I installed a wastegate Actuator, and on first install, I was seeing 38+psi. Each time it went that high, I immediately got out of it, so didn’t notice what was to come. A couple days later I dropped it down one full turn, expecting 34psi, but still running an excessive 37psi. Again, each time it went that high, I got out of it before noticing anything strange. A couple days after that, I adjusted it one more turn, again hoping for 34psi, but getting 36psi. I’m only 6 turns out, so I though for sure this would be it. Well this time, I stayed in the throttle a few times when it hit 36psi. Each time it would set a code 238, and the power would be seriously cut to the point of no more acceleration even though I still had it WOT.

So to make a long story short, any aftermarket turbo producing more than 36psi for 2+ seconds will set this code, and power will be cut. Any company releasing an aftermarket turbo will have to come up with some method to override this code.

And for anyone interested, I will not be keeping it at 36psi, and plan to lower it again this weekend, hopefully for the last time.Edited by: Amric

Monitored at the wastegate or post intercooler?

Measured at the wastegate

I know how to fix that problemhttp://www.dieselplace.com/forum/smileys/Big Smile.gif

I know how to fix that problemhttp://www.dieselplace.com/forum/smileys/Big Smile.gif


Anything I can do with my current setup, or do I need another program?

yes that problem is not present with the extreme on my truck, but i have had it happen in the pastwhen i first started playing with more boost.

I know how to fix that problemhttp://www.dieselplace.com/forum/smileys/Big Smile.gif

Now you tell me http://www.dieselplace.com/forum/smileys/Clown.gif

Now I think I might have been wrong as to the cause of the problem.


Today, I lowered the psi to a peak of 32psi. I took it for a few runs, and always got the same results. I never set the 238 code with the lower psi, but it would still not hold boost, and slowly fall all the way from 32psi to 20 psi even though I was holding it WOT. It fell off so smoothly that I'm starting to think that the issue is running out of fuel. I have both a 10u primary and OEM secondary fuel filter and no lift pump. When I first jump on the throttle at any speed in any gear, it goes like hel?, but after a few seconds (6 or so) it falls off smoothly.


I sure hope someone comes up with a high HP lift pump (or pumps) kit soon. I am good with mechanical and suspension, but I hate electrical and fuel, and don't want to risk fabing something up on my own.


Anyone think I could be right about it being fuel starvation before I go and spend big money on a good lift pump solution?Edited by: Amric

The problem lies in the programming. Put a module like a Juice or VA on it and it will no longer see the boost nor set codes.





I ended up needing to add a boost fooler to the Quad to get a full run on the dyno...

Can you tell me more about this boost fooler. I really want to get to the track soon, but the power is all over by 80-90mph right now.

Amric,


If you stack with the Juice you will get the boost fooler. The juice caps the boost signal so you don't get the code.

Any company releasing an aftermarket turbo will have to come up with some method to override this code.


The larger turbos will flow more air at a comparable boost level so you will pick up power even if the boost level is the same. Hopefully by improving the shaft design we will be able to run higher boost levels as well.