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Originally Posted by Inspect2020
It certainly will be a lot easier not to replace a perfectly operating transmission. I was kind of hoping that I could put in a 5 speed …..oh well. Any other ideas for getting the rpms lower at 80mph and still giving you a good launch?
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A 2.47:1 diff x ~a 3.6:1 first gear on around a 25" tire should still launch pretty well. Remember turbos are load dependant and it could actually be a bit better due to loading the turbo in first gear. Also the gear will be more "useable" as it won't upshift at 8-12mph or where it does currently from 1-2.
If you haven't yet, turn up the ALDA on the IP and check to see what your current boost levels are... I've read and seen these cars were running lower boost than stock and less fuel than stock from the factory. That will help it get off a stop light and into the boost.
Once you do that, install an EGT gauge and you could turn up the full load stop on the pump to get even more from it for now (until you strap on the IC).