Quote:
Originally Posted by Calubi
According to Hellion we can also get the kit with Precision 5562 turbos instead of the 6266 turbos. Would these be a better match for a street car that only runs 600-700whp?
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My experience with small twins.. I had a buddy with a 06 GTO that rocked twin 56mm turbos. LS2 M6 with the factory 3.42 gear. Car made mid 500's on 7psi. Honestly it was insta-spool... almost as quick as my 03 cobra roots blower. It was fun if you wanted to have a short gear pull here or there but normal driving actually sucked. You had to stay very light on the pedal and keep the rpms very low not to jump into boost under normal driving. I know sounds like fun until you realize your mpg is god awful because its just dumping gas all the time. There was no real in between.
With that being said the sizing of the turbos to the cubes play a huge roll. Larger displacement motors will eat up turbos in regard to upper rpms. You can change exhaust AR's to help that out but will generally swap low end for some lag and top end.
His car would be whizzing around 6k.
With the M6 in the 6th gen rocking 3.73's I don't think you will have any issue with them lighting off.. and if they do on say a highway pull then BRAKE BOOST!!!
At the same time I had another buddy would owned a STS 6.0 GTO M6. I had heard a lot of bad things about rear mounted turbos. When I drove his car I was oddly surprised... It was like I could drive spiritedly on the 400hp 6.0 motor from light to light not getting into boost. If I stuck the pedal it was lazy but when it came on it had no issue pulling even up in the upper rpms. But on a highway pull... BRAKE BOOSTED!! INSTA-BOOST!!
Anyway I hope that did bore you!! Personally I would say the 62's would be the perfect choose unless you plan to make 1000-1200WHP with 427 cubes. Then I would go to 67's.. The 62's seem to sign off early at that point rpm wise.