Turbo questions
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Joined: Feb 2007
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From: Sterling Heights,Mi
Turbo questions
This I am sure has gone around more times then once, and I do know that I can find the answers between all of the threads lately.. But I am hoping that the answers will all come in one..Why/when is a modded turbo needed?
I was reading the other day about the exhaust port being to large for a truck that pulls alot ( lower RPM deal )
There is a thread going on about the 38r, this I believe to be a roller bearing type turbo, should spool pretty quick, but what is the exhaust diameter of it, and with it being a roller bearing type, would it to have the lower RPM issues?
Why a van turbo?
Would a van turbo do well towing? Would a van turbo benifit from a wicked wheel?
Sorry for the ignorance, I am sure I have more questions, and I am hoping others do as well?
Post Fiend
Joined: Feb 2007
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From: Dallas-Ft. Worth
This I am sure has gone around more times then once, and I do know that I can find the answers between all of the threads lately.. But I am hoping that the answers will all come in one..Why/when is a modded turbo needed?
IZ: Whenever you have turbo surge, hot tunes, bigger injectors, or any combination of these.
I was reading the other day about the exhaust port being to large for a truck that pulls alot ( lower RPM deal )
IZ: I think you mean the exhaust housing. The issue is the larger the exhaust housing, the more it favors the upper end (like WOT throttle runs). When towing, you likely need to have the turbo spooled sooner that it would with a larger housing to keep EGTs down. So a slightly smaller housing will take care of this if it can't be controlled otherwise.
There is a thread going on about the 38r, this I believe to be a roller bearing type turbo, should spool pretty quick, but what is the exhaust diameter of it, and with it being a roller bearing type, would it to have the lower RPM issues?
IZ: Even with bearings instead of bushings, a larger housing will slow the spooling. Think of the exhaust housing as a straw. Pushing the same amount of exhaust through a small straw means it spins the turbine faster & sooner, but becomes a restriction eventually raising back pressure & EGTs. A larger straw will spin the turbine wheel slower with a certain amount of exhaust and takes longer to get it up to speed, but is more "open" at the top end.
Why a van turbo?
Would a van turbo do well towing? Would a van turbo benifit from a wicked wheel?
IZ: I'll answer both of these at the same time. A van turbo is just a stock turbo with a 1.15 exhaust housing and slightly different turbine wheel. The intake side and oil housing is identical. The larger housing allows you to run hot tunes & larger injectors (more fueling) without nearly as much exhaust back pressure as you'd have on the .84 stock housing. It essentially shifts the "sweet spot" of the turbo up in RPMs, maybe too much in some circumstances for towing. However, I know several folks that tow with it fairly heavy with no issues.
Sorry for the ignorance, I am sure I have more questions, and I am hoping others do as well?
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