Gtp38r
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Gtp38r
I’m new here but trying to get some information. I have an 2001 f350 cc duality, 4” exhaust, 6637 intake filter and presently stock turbo with a ww2 . 6 speed manual transmission.TP tuner 60,daily and 80hp tow.
I live in NH I have a problem with egt’s on Some hills. I just retired and plan on traveling through the US, rzr on the truck and a 8000 LB trailer.
I just purchased a gtp38r and was wondering if anyone is running stock injectors and your results with egt’s. I’m sure the mountains out west will make hills here small compared to them. Considering new injectors.
Any help would be appreciate.
thanks
I live in NH I have a problem with egt’s on Some hills. I just retired and plan on traveling through the US, rzr on the truck and a 8000 LB trailer.
I just purchased a gtp38r and was wondering if anyone is running stock injectors and your results with egt’s. I’m sure the mountains out west will make hills here small compared to them. Considering new injectors.
Any help would be appreciate.
thanks
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
Hi and welcome to the forum.
Is it possible to send the GTP38R back?
I feel like there are better options available nowadays. I hated the 38R with 6637 filter. It literally screams at you endlessly when towing. It also liked to live at higher rpm than I typically want to run.
The KC Stage 1 63/68 has great reviews. This would be my choice for a drop in turbo with stock injectors. Either that or the KC balanced assembly in a stock turbo.
Have you tested for boost leaks and checked for exhaust drive pressure leaks? Those will rob power and elevate EGTs.
Is it possible to send the GTP38R back?
I feel like there are better options available nowadays. I hated the 38R with 6637 filter. It literally screams at you endlessly when towing. It also liked to live at higher rpm than I typically want to run.
The KC Stage 1 63/68 has great reviews. This would be my choice for a drop in turbo with stock injectors. Either that or the KC balanced assembly in a stock turbo.
Have you tested for boost leaks and checked for exhaust drive pressure leaks? Those will rob power and elevate EGTs.
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
I could make 34 psi and still had a plenum leak (boost) and a leak between manifold and head (exhaust drive pressure).
Edit: I mentioned this but failed to say why. The good info Jimmy provided in the next post sums it up well.
Edit: I mentioned this but failed to say why. The good info Jimmy provided in the next post sums it up well.
Laughing Gas
Joined: Nov 2020
Posts: 994
Likes: 367
From: Republic of Texas
Search for boost leak detector procedures and follow the instructions on the forum....
One of the biggest causes of high EGT's are boost leaks. Just having reasonable boost numbers on a gauge does not preclude the presence of leaks. You are asking the engine to do the hard work without the air to do the job.
One of the biggest causes of high EGT's are boost leaks. Just having reasonable boost numbers on a gauge does not preclude the presence of leaks. You are asking the engine to do the hard work without the air to do the job.
Laughing Gas
Joined: Oct 2020
Posts: 785
Likes: 150
I second the notion of return the 38R if you can. I have no personal experience with one, but I have yet to read anything from the last 5 or 10 years that ended with a happy owner with one. At one time it was the only option, but now there are so many good options from mild to wild in the drop in turbo market.
Here is a link to the "Turbo Matrix".
https://www.ford-trucks.com/forums/1...t=turbo+matrix
Here is a link to the "Turbo Matrix".
https://www.ford-trucks.com/forums/1...t=turbo+matrix
Laughing Gas
Joined: Jan 2009
Posts: 911
Likes: 74
From: Montana
I would say KC Stage 1 but I have personally have never ran one but it has to be better then a 38R
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Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
DP tuner is infamous for higher than necessary EGT and other, more serious problems. Better tuning is strongly recommended. I am very impressed with AA tuning these days and I’ve run tunes from several people over the years.
https://aa-design-tuning.com/
More common than boost leaks is drive pressure leaks. I basically never see factory up-pipes that don’t leak these days. Upgrade to bellowed up-pipes.
https://www.ford-trucks.com/forums/1...lete-pics.html
I too hated the 38R. Especially with 6637 filter. For stock or Stage 1/1.5 injectors I would recommend the KC S300 balanced assembly as a turbo upgrade. Might as well rebuild the turbo with 360* thrust washer kit while you’re in there (it’s an easy job).
https://aa-design-tuning.com/
More common than boost leaks is drive pressure leaks. I basically never see factory up-pipes that don’t leak these days. Upgrade to bellowed up-pipes.
https://www.ford-trucks.com/forums/1...lete-pics.html
I too hated the 38R. Especially with 6637 filter. For stock or Stage 1/1.5 injectors I would recommend the KC S300 balanced assembly as a turbo upgrade. Might as well rebuild the turbo with 360* thrust washer kit while you’re in there (it’s an easy job).
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Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
I'm running a GTP38R from years ago. 1.15 AR housing, no wastegate or EBPV. Larger than stock injectors using DP Tuner. I tried the Hydra but after getting several others who tuned it but failed to make it work, I had Jody datalog the thing and we got it done. I don't know about excessive EGT in my rig.
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
And sorry to the OP. I know we aren’t exactly telling you what you want to hear. But we are attempting to be truthful and help you out even though it’s not a pleasant truth.
CNCFAB
Joined: Apr 2020
Posts: 4,874
Likes: 2,006
The 38r will work with stock injectors, in fact I found it to work best with stock nozzle injectors, when I went to oversize nozzles I have more take off smoke or shift shift smoke(zf6) The 38r will keep egts down better then a stock turbo, it will not spool and operate at the same rom range though. What does this mean? Cruising down the highway at 1800-2000 rpms you will be under the turbos happy place, boost will not come on quick if say you have to floor it and pass a slow truck or avoid something, this is exaggerated with a zf6 because it wont just downshift super fast by itself. A 38r is not a “bad” turbo, but as time has progressed we have been blessed with better options, KC turbo leading the way for drop in options.
If you can keep rpms up enough(what gearing do you have?) it works fine.
As stated before me, it is a noisy ear piercing turbo, especially on long trips highway. I took one 1,000 mile trip and sold it as soon as I could. Some guys that doesn't bother, I cant stand extra noise like that.
Have you done bellowed up pipes?
boost leak checks
exhaust (pre turbo) leak checks
What intake filter are you running?
If you can keep rpms up enough(what gearing do you have?) it works fine.
As stated before me, it is a noisy ear piercing turbo, especially on long trips highway. I took one 1,000 mile trip and sold it as soon as I could. Some guys that doesn't bother, I cant stand extra noise like that.
Have you done bellowed up pipes?
boost leak checks
exhaust (pre turbo) leak checks
What intake filter are you running?
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
I'm running a GTP38R from years ago. 1.15 AR housing, no wastegate or EBPV. Larger than stock injectors using DP Tuner. I tried the Hydra but after getting several others who tuned it but failed to make it work, I had Jody datalog the thing and we got it done. I don't know about excessive EGT in my rig.
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My last trip out towing was in September and had a head gasket go. Had to have someone pull the motor to change head gaskets because i had work commitments. I got him new up pipes for reinstall which he told me he struggled with. Have not towed since and they leak. Now that I'm retired, I have the time to fix myself, that's why I want to change the turbo while I have it apart.
I picked up this truck from Georgia July 2020 with 51,000 miles now has 76,000 mi.
I have reach out to the supplier to see if I can return turbo but not sure what to do yet, if I keep my stock injectors, I should be ok ,I will wait and see about the 6637 filter. I have 4.10 gears and running 65 70 I'm above 2000 rpm so that works. I will have to get more info on waste gate set up. The big question is how dependable this turbo is.
The only sure thing for a different turbo is a t-4 system, expensive.
Just saw other post with running 38r,i have a resonator on my exhaust and I have no turbo whistle. I have seen where people have a problem keeping boost leak detector connected when putting air to it, any tips. I will purchase a leak detector.
I picked up this truck from Georgia July 2020 with 51,000 miles now has 76,000 mi.
I have reach out to the supplier to see if I can return turbo but not sure what to do yet, if I keep my stock injectors, I should be ok ,I will wait and see about the 6637 filter. I have 4.10 gears and running 65 70 I'm above 2000 rpm so that works. I will have to get more info on waste gate set up. The big question is how dependable this turbo is.
The only sure thing for a different turbo is a t-4 system, expensive.
Just saw other post with running 38r,i have a resonator on my exhaust and I have no turbo whistle. I have seen where people have a problem keeping boost leak detector connected when putting air to it, any tips. I will purchase a leak detector.
Lead Driver
Joined: Jul 2017
Posts: 6,855
Likes: 2,332
From: WV
My last trip out towing was in September and had a head gasket go. Had to have someone pull the motor to change head gaskets because i had work commitments. I got him new up pipes for reinstall which he told me he struggled with. Have not towed since and they leak. Now that I'm retired, I have the time to fix myself, that's why I want to change the turbo while I have it apart.
I picked up this truck from Georgia July 2020 with 51,000 miles now has 76,000 mi.
I have reach out to the supplier to see if I can return turbo but not sure what to do yet, if I keep my stock injectors, I should be ok ,I will wait and see about the 6637 filter. I have 4.10 gears and running 65 70 I'm above 2000 rpm so that works. I will have to get more info on waste gate set up. The big question is how dependable this turbo is.
The only sure thing for a different turbo is a t-4 system, expensive.
Just saw other post with running 38r,i have a resonator on my exhaust and I have no turbo whistle. I have seen where people have a problem keeping boost leak detector connected when putting air to it, any tips. I will purchase a leak detector.
I picked up this truck from Georgia July 2020 with 51,000 miles now has 76,000 mi.
I have reach out to the supplier to see if I can return turbo but not sure what to do yet, if I keep my stock injectors, I should be ok ,I will wait and see about the 6637 filter. I have 4.10 gears and running 65 70 I'm above 2000 rpm so that works. I will have to get more info on waste gate set up. The big question is how dependable this turbo is.
The only sure thing for a different turbo is a t-4 system, expensive.
Just saw other post with running 38r,i have a resonator on my exhaust and I have no turbo whistle. I have seen where people have a problem keeping boost leak detector connected when putting air to it, any tips. I will purchase a leak detector.
The 38r has a decent reliability reputation. Two things I have heard impacting this is
1- Dirty oil. The ball bearings do not like dirt. Keep the oil changed regularly.
2- Modified compressor wheel. It seems the ball bearing turbo does not like to be changed from factory. Many people have installed billet wheels, but the majority of issues we have seen on the forums have involved “modified” turbos. If I were to run it, I would not open it up.
The 4.10’s should help you compared to my experience with the 38r. They will keep you up in a better rpm for the turbo than my 3.73’s.
I made a boost leak detector out of a pvc pipe cap based off instructions found on this forum somewhere. KC Turbos sells a really nice one. You can see it (or get in line) here. https://www.ford-trucks.com/forums/1...-detector.html
Tips? Well I’ve blown my detector off… Stay out of its way. Lay an old towel across from it to absorb shock.
Lately no issues though. I roughed up the edges of the pvc and also use a good and tight T clamp.