7.3 compound turbos

dsberman94 · Mar 31, 2015

lincolnlocker said:
10-4... side note, how often do you hear of a 38r needing rebuilt... dont believe i have heard it yet on this forum...

live life full throttle

Just read about one not too long ago. Took the truck to DYNOPROVEN for a different part, may a hpop, and the 38r was trashed. Had a pretty decent amount of shaft play. 100k miles on it iirc. The owner just ended up getting a brute 66 from DP at that point.

TyCorr · Mar 31, 2015

dsberman94 said:
Just read about one not too long ago. Took the truck to DYNOPROVEN for a different part, may a hpop, and the 38r was trashed. Had a pretty decent amount of shaft play. 100k miles on it iirc. The owner just ended up getting a brute 66 from DP at that point.

He also had no idea it was trashed. So was it?

dsberman94 · Mar 31, 2015

Guess we'll never know.

TyCorr · Mar 31, 2015

My point was more it shouldnt be stated because we didnt know. I highly doubt some 100% nozzles roached it but whatever...

old man dave · Apr 1, 2015

jngreen said:
They are not really rebuildable, and there have been a few people who have trashed them in compound setups.

They are rebuildable, my buddy's kid had the new 38r I gave him rebuilt. Problem is it costs almost as much as just buying a new 38r. Turbo had sat for a long time and apparently rusted the bearings and fried itself after 3/4 mile in a stock truck...LOL

jngreen · Apr 1, 2015

old man dave said:
They are rebuildable, my buddy's kid had the new 38r I gave him rebuilt. Problem is it costs almost as much as just buying a new 38r. Turbo had sat for a long time and apparently rusted the bearings and fried itself after 3/4 mile in a stock truck...LOL

Correct, you can buy a new center section for almost the cost of a new turbo.

lincolnlocker · Apr 1, 2015

lincolnlocker said:
where they using a 1.15 externally gated housing?

live life full throttle

this must have gotten overlooked...... cuz that right there would have mede a huge difference unless they dont have a clue how to set up a gate for compounds...

live life full throttle

NyCowboy87 · Apr 1, 2015

Not looking to start an argument but I have always stood by my belief that if everything is set up correctly and sized accordingly, a gate is not needed and the chargers should spool almost as well as a undersized set with gates. I did it with my truck 5 years ago with a hx55/s4t set. 65psi of boost in the street tunes and 1100* egts. Chargers were at full song by 2200rpm cruised 65mph at 5psi, by far the best setup for a fun street truck I had on it.

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lincolnlocker · Apr 1, 2015

NyCowboy87 said:
Not looking to start an argument but I have always stood by my belief that if everything is set up correctly and sized accordingly, a gate is not needed and the chargers should spool almost as well as a undersized set with gates. I did it with my truck 5 years ago with a hx55/s4t set. 65psi of boost in the street tunes and 1100* egts. Chargers were at full song by 2200rpm cruised 65mph at 5psi, by far the best setup for a fun street truck I had on it.

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correct.. and that sounds like a blast to drive!

live life full throttle

TyCorr · Apr 1, 2015

Shouldn't need a gate...unless you cobbled the setup together..

DocBar · Apr 1, 2015

dsberman94 said:
Just read about one not too long ago. Took the truck to DYNOPROVEN for a different part, may a hpop, and the 38r was trashed. Had a pretty decent amount of shaft play. 100k miles on it iirc. The owner just ended up getting a brute 66 from DP at that point.

That was me and that is accurate.

psduser1 · Apr 1, 2015

NyCowboy87 said:
Not looking to start an argument but I have always stood by my belief that if everything is set up correctly and sized accordingly, a gate is not needed and the chargers should spool almost as well as a undersized set with gates. I did it with my truck 5 years ago with a hx55/s4t set. 65psi of boost in the street tunes and 1100* egts. Chargers were at full song by 2200rpm cruised 65mph at 5psi, by far the best setup for a fun street truck I had on it.

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Would you be willing to elaborate?

I've always been told, and in fact bought a setup that included waste gates from well respected vendor here. I since decided not to do that setup, simply because reliability is more important on that truck, so all the stuff is on the shelf, still.

TyCorr · Apr 2, 2015

His thinking is outlined and clear...and its exactly why ive thought people choose chargers that are too small all the time.

If the chargers are sized properly a gate is not needed. A gate is used to vent to atmosphere or divert to another part of the system drive pressure. If housing and charger size are selected based on cfm and careful attention to the turbo maps and pr of each charger, you dont need to gate off pressure you worked so hard to get.

NyCowboy87 · Apr 2, 2015

Exactly what Ty said, also head porting, cam and injector selection play a role in it. Everything has to work together.

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