GTP38R?

[Roc87]

Looking into replacing the stock turbo, other mods in sig, would the GTP38R be a good choice or is there something that may be a little better? I usually tow a toyhauler that's close to 10K#'s, with stock turbo the EGTs get a little warm going up the hills, the tow setting on my tunes is kind of "doggy", so I usually just leave it on daily unless the EGTs get too warm. Runs great with the trailer on flat ground, but blows a little smoke with the slow spool up when not towing.

[7.3Lariat]

I personally think it would work fine. May look at adding the 1.15 housing to keep the EGTs even lower. But the standard 38R housing is an improvement over stock .84.

[Roc87]

Thanks! Any other opinions?

[Nally7.3Powerstroke]

Agree with 7.3 Lariat

[INFRNL]

Sd66 turbo but 38r should do you good too. I am pretty sure the 1.0ar housing is better for towing iirc

[boschert_72]

Im currently running a GTP38R with 1.0 and i pulled 26,500 gross over cabage hill in oregon, its like 5% grade for 10 miles or something stupid. 850 post turbo at 78mph if i click off the OD and bring her down to 64ish it runs atound 790 post and im 6'' up with 37 x 14.50's
Very happy with my 38R

[B4SouthernMiss22]

I have the 38r and I love it. I tow my john deere 410D backhoe (dry weight is about 16500)

[INFRNL]

Originally Posted by boschert_72

Im currently running a GTP38R with 1.0 and i pulled 26,500 gross over cabage hill in oregon, its like 5% grade for 10 miles or something stupid. 850 post turbo at 78mph if i click off the OD and bring her down to 64ish it runs atound 790 post and im 6'' up with 37 x 14.50's
Very happy with my 38R

your temps seem high for post turbo iirc. Why did you not install the probe pre-turbo like it should be. Your temps will be very inaccurate and vary too much from accurate readings; they are not consistant. I think your temps translate to above 1250 deg iirc. I would not trust the temps from that location.

[boschert_72]

The probe was installed already when I bought the truck. It translates to roughly 200-250 degree difference with this set up. It is very consistent because it always measures from the same point in the pipe. You just have to modify the "limits" in you brain.

[85_305]

Originally Posted by boschert_72

Im currently running a GTP38R with 1.0 and i pulled 26,500 gross over cabage hill in oregon, its like 5% grade for 10 miles or something stupid. 850 post turbo at 78mph if i click off the OD and bring her down to 64ish it runs atound 790 post and im 6'' up with 37 x 14.50's
Very happy with my 38R

Post turbo... not a good place at all to run egt probes...

Originally Posted by INFRNL

your temps seem high for post turbo iirc. Why did you not install the probe pre-turbo like it should be. Your temps will be very inaccurate and vary too much from accurate readings; they are not consistant. I think your temps translate to above 1250 deg iirc. I would not trust the temps from that location.

this is very very true.

Originally Posted by boschert_72

The probe was installed already when I bought the truck. It translates to roughly 200-250 degree difference with this set up. It is very consistent because it always measures from the same point in the pipe. You just have to modify the "limits" in you brain.

no, it does not necessarily translate to 200-250* difference. Some trucks it's 300* difference. Some it's over 300* difference. Some trucks its less than 200* difference. The probe in that location is also slow-reacting. I wouldn't trust that spot for accurate egt reading at all.