Orange Stroker
Member
I do
Guys.....
These suggestions are band-aids, not a fix. His truck with 160/30's should not be seeing those temps while towing. Something is going on, either a tuning issue or something else. A buddy of mine runs the same injectors and a 38R and never has EGT issues when towing over mountain passes here in CO. I know because I've used his truck as a test mule for tuning. EGT's towing never crack 1200 degrees, and he pulls heavy loads from time to time. And these aren't "stock" like tunes either, this is on his daily driver setting that pulls well north of 300hp.
To the OP..... 1400 degrees on a truck like that is a sign of a problem. Find and fix the problem. Don't try to patch it with additional mods. Unfortunately it's going to be tough diagnosing something like that over the forum with limited info.
The 1.15 housing and WW on a 38R may be the culprit, or might not be. I've never run or data logged that combo at high altitude. I would assume that egts would be a bit higher on the low side of the RPM range because the turbo would be a bit slower to spool, but should be fine with the turbo at speed while pulling a heavy load uphill at higher RPM's. But without knowing what kind of boost numbers he's seeing or how effective that turbo really is at high altitude, it's just a guess at this point. I can't imagine he would have any back pressure issues, but airflow might be another story. Of course you have another turbo coming for it, swapping them out and checking the EGT's might tell the tale.
If you pressure tested the compressor side and it held, then you don't have a boost leak. On the other hand an exhaust leak usually will give you a sign with soot showing somewhere. Check the back of the turbo at the collector. If that pin isn't lined up, you're going to have a leak. When you pull the turbo, you'll see if there's been any sign of a leak.
What ICP are you seeing when pulling up a grade? You say it's not out of range, but what numbers are you actually reading?
On top of that, what pulse width are you reading when pulling up a grade. What PW do you see at WOT unloaded? That info can tell us a little about the tuning. Now if it's a timing issue with the tuning, that won't show up. Too little timing will cause EGT issues, too much gets a noisy rattling tin can. At least with PW we can see if that's an issue or rule it out.
Anyway, there are a few suggestions to look at. Have fun.
Ok I took the "stock" (Intake, Exhaust, NO tunes, same gearing and tires size) truck with the same load/gearing up the same hill. The egts maxed out at right around 1150.
I'll get some data logging with pw, icp, ipr, mfd, mvd, and boost pressures. Empty this truck can hit 1300 on the tow program with just a wot run at virtually any speed.
The don't want to just throw a bandaid on this whatsoever that was never in my intentions and I won't do it.
