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id never try for 15k rpms, 10 sure, 12-maybe, but not 15 lol
Well yeah, that was just a number that I pulled out of my ass. I don't think anyone has tried to rev any 4G motor past 11-12k.
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& the last stage workover on the dsm awd trans offered by Sheptrans (before going to the $7,000-8,000 Dog Box) for the manuals can push over 10k+ rpms-other than those, im yet to find any trans that seems to wanna go over 8k
Unless Shep is having custom gearsets made that are stronger, I don't see how this would be possible for any extended period of time. I have a really old TRE trans in my car (~10-12 years old), and it shifts great at 9,000rpm.
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& like i said, its not really a matter of power, its for a great mpg micro-engined weekend cruiser, & maybe to play in the snow in... (i had a buddy with a 4g64 5 speed 3g & im assuming an lsd, & the damn thing got around better in the snow than most of the 4x4s around here when the snow went crazy here in ohio a few years ago).
There are lots of ways to get awesome gas mileage in these cars without using some wacky engine combination. I got 33mpg in my Mirage with a 4G63 swap and a 1g DSM FWD trans & AWD 5th gear. This was just with basic S'AFC + wideband tuning, didn't even have an EPROM ECU in the car. 660cc injectors and a Walbro 190lph pump. A lightweight FWD car with some good tuning will go a long way.