I was firt thinking gearing too but you say they are the same.

MY next guess is the AFC is not functioning properly on one of the trucks.

 

A guy could hook his AFC boost signal line directly to the line that the wastegate gets it signal therefore bypassing the AFC altogether that way you could "gut" the AFC and still have the w/gate functioning. Probably have to adapt the two lines together I think they're a different size but I bet it'd work.

 

well i did it. using the adjustable boost elbow (closed for now) in the intake to the wastegate tube. secured all openings to the afc BUT did not gut it. power seemed low but alot smoother response with much more smoke. what would the performance be if i now gut the afc ??....would have done it but i cant stand those break-off screws when i dont have the tools to get it off.

 

Get a long slotted screw driver you don't mind beating on and make a slot or better yet use a long cold chisel. Then what work to bust it loose is an impact driverusing a long extension between the bit and the impact tool
here's the tool or any like tool:http://www.kd-tools.com/1140.htm. That is just one of a few ways the bfreak off screw can be managed. If you took out the lever you'd have instant pre-boost fuel as the AFC would be renedered useless as the pre-boost regulating device, hence quicker spool up and more smoke. If you open the elbow you bleed boost signal to the w/gate thus increasing the boost pressures.

 

on my stupidity, i found the screw on the back of the afc was flush with the locknut ! not sure when i did this but were should it be ? could this have been the problem ? what does it control ?... i was told years ago that it was the "smoke screw"....too much beer one night i geuss

 

if i bleed boost?..how would this build boost ?...this would only control the wastgate opening right ? your the man...what you say goes in my book, but what about higher rpm fueling? this did fix my over fueling at peak 1 to 1 and fith gear. also, egt's have not went over 700 ( at post turbo ) at w.o.t. in 5th at 80 m.p.h.

 

That screw is fine adjustment for ythe smoke screw I think. The coarse adjust is the one that is on top of the AFC that is an allen plug as the picture shows here:

 

Bleed boost signal to the w/gate makes the w/gate open later. Put big injectors in like 300 or 370 hp mmarine injectors and you close the boost controller cause now you have enough fuel to overrun the turbo. I would MOST definately get the pyro probe pre-turbo. 700* post is probably somewhere 1300*-1500* pre-turbo, a cracked turbine hsg in time will result and or other BAD things. Here's a link for proper pre-turbo probe placement:
http://www.piersdiesel.com/TechPyroInstall.htm

 

the '96 is pre-turbo. 700* at the elbow is 1100* pre-turbo

 

its not a true 400* variation. i ran a probe pre and post turbo to see as have others and at times under load and boost i saw variations close to 550-600* pre to post turbo.

 

dam......i was always told it stayed at 300* deviation untill full load at 400* !!

i have went as high as 950* luckly i didnt blow her up

 

I ran 2 probes and with 400 HP at the rear wheels I saw 600-650 on a regular basis and have seen over 700 full bore up a hill towing.
Bruce

 

Harry at Piers told me its arround 300 degrees plus 10 degrees for every pound of boost?
So 300 + 300 @ 30lb boost= 600 or there abouts

 

why guess?

and it's easy too

 

I think a buddy of mine has the same problem. We first made a #100, then he wanted more power and smoke so we ground her flat, or #0. Well he had more smoke and more power with the #100 than with the #0. So tomorrow in school i was thinking about gutting the AFC but i have never done it before what is involved in gutting it and how is it done. Just wonder we want smoke we do not care about smoke. BTW the truck is a 1994 with an auto. He also doesnt care about the tranny.


Cody