Engine/Transmission (1994 - 1998) EGT's with a 160pump

[LEnglish]

Wanted to see if what I am seeing sounds right.



On my '95 12v AT I have the timing set to 14 deg and a cust plate that is close to a #5 in looks and it is slid all the way forward. With just this done the truck would hit 1300deg around 80MPH from a stop.



Today I was rechecking my timing and put my 191 DV in. On my 1st test drive the truck pulled much harder but the EGT's pegged 1500deg by 50mph. If I roll on it just cruising the EGT's almost move as fast as the boost gauge. Before with my boost controller I was set at 35psi. I am now straight WG line no bleeder or controller and it is still reaching 40psi on the stock HX35.



I have a cheap 16cm waistgated 58mm HX40 and 370's to put on still, but I am thinking the EGT's will still be out of control.



I thought with the 160pump I would have a hard time getting enough fuel, but I guess I was wrong.



Do you guys think with the HX40 and 2-3deg more timing I might be able to keep the EGT's under 1500deg if I put the 370's in?





Mods



-cust 3. 5in DP right off the turbo no cast elbow

-4in straight through exhaust starting after DP with a diesel Magnaflow muff and a turndown right after the muff which is right before the rear axle

-Cust plate looks like a #5 plate slid all the way forward

-3 GSK with the shifts set at 2800 RPM

-191DV

-Built transmission with good converter

-Boost creeping to 40psi.

-stock hose to a 7in around and 8in long K&N filter with a prefilter over it.

 

[ndurbin]

I can peg my EGT gauge pretty easy with my set-up. You might try moving the plate and AFC housing back, and turn the star wheel back some to cut back the fuel.



Nathan

 

[tp0d]

First, Welcome to the TDR!



Sounds like that 160 is making some good fuel, the 370's will just make the EGT problem worse. (may also make it run rough, due to previous problems with the 160 and 370s). The HX40 may be a big enough huffer to keep up, but with shaft problems at high boost, I`d be -very- careful with it. May want to investigate a hybrid 35/40



Stepping from 14° to 16-17° timing, you may get 200-250°f drop, mebe more. But at high boost, you're putting a good bit of pressure on your stock headgasket. I run mine at 16. 5°, but I dont have quite as much fuel as you do.



I see you have an external K&N. There have been different reports flyin around about the filtering capacity of K&N under high suction... I went with a BHAF myself, its about twice the size of the K&N with filter media about 2" thick. Been runnin mine for about 25k now, almost looks new. . Prefilter also.



As Nathan said above, the afc changes would bring down your egts in the low end, might help slow the temp rise. .



good luck



-j

 

[argve]

I was having egt problems and was instructed to back off the AFC wheel a little to slow the rise of the egts - it worked.

What I seen performance wise via my butt-o-meter is that when I'm at the lower rpms (less than 1500 rpms) the truck is sort of doggie in that I romp on it and she just sort of sits there but once I'm at or greater than 1500rpms she comes alive just like she used to. Lowered my egt's by about 100° while towing. I also don't slam the needle on the pyro so hard past 1500° when I'm playing in traffic.

So overall I don't think I lost any power (where it counts). The other thing I noticed is that I don't fog the entire street now when I romp on it - yes I still blacken the roadway but not as much - meaning I'm getting more bang for my buck.

 

[LEnglish]

Thanks for all the input. I just wanted to make sure there was not something wrong with my setup.



I have now played with the AFC housing and plate some. I love the way the truck drives to much to move the AFC housing back forward. I have now move my plate about 1/8in back form full forward and can keep it WOT from a stop to 60MPH before it hits 1500 deg and it has let my boost drop to 35psi with no boost contrller of any kind. With it set up like this I can give it about 60% throttle still get high enough RPM shifts and keep it at 1400deg to over 100mph.



The way it was before at 1/2 throttle it would hit 1500deg and shift to early. I still may back the plate off a bit more.



I sure love moding the Diesel you get so much for so little.