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Old 10-04-2008, 04:28 PM   #1
.alex.
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Default GT42 v St70 (twins)

Whats a better combo for a twin setup, twin gt42's or of twin st70's.
Considering it for a 402ci lsx motor?
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Old 10-05-2008, 10:50 AM   #2
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How fast you wanting to go?
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Old 10-05-2008, 01:50 PM   #3
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no class racing, just want to go racing, mostly index, TNT, and grudge.

So what ever it runs it runs.

i was thinkin it would be best to keep it below 76mm so twin gt76's gt42 or the st70s
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Old 10-06-2008, 09:16 AM   #4
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Quote:
Originally Posted by .alex. View Post
Whats a better combo for a twin setup, twin gt42's or of twin st70's.
Considering it for a 402ci lsx motor?
A pair of 70mm'ish turbos will get you close or at 8.5's, also a 80-88 mm single will do it to. Do you have a 25.X chassis? If not no need to go so fast you can't go racing.
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Old 10-06-2008, 11:47 AM   #5
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Quote:
Originally Posted by Robert1320 View Post
A pair of 70mm'ish turbos will get you close or at 8.5's, also a 80-88 mm single will do it to. Do you have a 25.X chassis? If not no need to go so fast you can't go racing.
Will 400ci choke out an 88mm?
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Old 10-06-2008, 12:31 PM   #6
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My old combo went high 8.20's on 66's at 3200 lbs.

The silver car we did with twin gt4294's and a 39X C5R went 5.teens 145 in the 1/8th before it was sold.

you should be really close to a 7.9 with a well matched motor and chassis.
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