john craig 70
- Thread starter turbogus
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NO not unless you have such a good waste gate that you limit the boost to 5-7psi.
jasjamz
THS Racer
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injector flow rate X 6 X 2= Max Hp they can support. I would upgrade if you plan on any boost in the 20's or even close. HTH
You'll need lots (I mean Lots) of Alky Spraying if you go with the 70
Do you have a convertor stall high enough to spin this thing?
I gotta tell you, I have not seen very good results with a turbo this big without supporting mod. Head work. cam. ETC.
Do you have a convertor stall high enough to spin this thing?
I gotta tell you, I have not seen very good results with a turbo this big without supporting mod. Head work. cam. ETC.
jasjamz
THS Racer
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70mm on a stock motor...nah, doubt you'd like it.
salvageV6
Daily Driver
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- May 25, 2001
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You can easily run the 42's on pump and non-progressive alky. to 23psi. with a stock motor with a GT70 turbo DBB p-trim, I did for a few months.
Went to 55's low Z after that.
If you don't have alky. and intend to run stock boost levels with a stock motor on pump gas you would still be at a relatively low D.C. level with the 42's.
Ported heads and cam. might be a different story.
Injectors support overall HP, not turbos.
You won't be making that much on pump gas.
With race gas on a stock motor you might be able to hit 25psi. with them, maybe 26-28psi. like they did in the old days with higher static fuel pressure.
No reason to dump them immediately, hit 400 RWHP or so first, then change them out.
You need to clarify your goals first, then post your entire combo.
Went to 55's low Z after that.
If you don't have alky. and intend to run stock boost levels with a stock motor on pump gas you would still be at a relatively low D.C. level with the 42's.
Ported heads and cam. might be a different story.
Injectors support overall HP, not turbos.
You won't be making that much on pump gas.
With race gas on a stock motor you might be able to hit 25psi. with them, maybe 26-28psi. like they did in the old days with higher static fuel pressure.
No reason to dump them immediately, hit 400 RWHP or so first, then change them out.
You need to clarify your goals first, then post your entire combo.
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Chavo is a poet and didn't know it!
salvageV6
Daily Driver
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I only have 175K on mine, 25psi. except in the winter. 21 there. 
Maybe that's a safe limit on an old motor.
If Buick built the engine it shouldn't blow at 475-500 flywheel hp.
Maybe that's a safe limit on an old motor.
If Buick built the engine it shouldn't blow at 475-500 flywheel hp.
