I'm starting a turbo project. Few questions.
12-03-2005, 11:42 AM
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I'm starting a turbo project. Few questions.
On my turbo project I have decided on a turbonetics T70 with a P-trim exhaust. Should I use anything other than 9.5:1 compression with 15-18 psi on 93 octane? One last question. Is the ball bearing turbo that much better than the non ball bearing one? Pros? Cons? Thanks
12-04-2005, 12:55 AM
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Car: 1989 GTA
Engine: Future: LSX Turbo
Transmission: built T-56
i dont know much about ball bearing turbos i want to know more but i do know with 15-18 psi you want like 8.5 to 1 on the CR 9.5 is WAY to high
12-06-2005, 12:54 PM
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Yes, that CR should be much lower for 93 octane unless you're running alky injection with aluminum heads too, or you could switch to E85 fuel if it's in your area.
A BB turbo will spool up a little quicker than a non-BB, especially the higher rpm transient response (the time it takes to go from 0 psi to your 15-18 psi from low throttle to WOT, at an RPM where the turbo would already be at full boost with a full WOT run, say a 4500 rpm punch). Hopefully that made sense.
They also theoretically last longer, but I don't know of any properly maintained non-BB turbos that haven't lasted less than 100k miles on a street car anyway.
They are more efficient as well (even under full boost), but I don't know if that makes much of a difference.
In short... If you have the money, go for the BB option. If you don't, save your money.
$.02
A BB turbo will spool up a little quicker than a non-BB, especially the higher rpm transient response (the time it takes to go from 0 psi to your 15-18 psi from low throttle to WOT, at an RPM where the turbo would already be at full boost with a full WOT run, say a 4500 rpm punch). Hopefully that made sense.
They also theoretically last longer, but I don't know of any properly maintained non-BB turbos that haven't lasted less than 100k miles on a street car anyway.
They are more efficient as well (even under full boost), but I don't know if that makes much of a difference.
In short... If you have the money, go for the BB option. If you don't, save your money.
$.02
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