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thstone · 07-19-2017, 08:26 PM

In a racing weekend, I will typically do around 400 shifts near/at redline (every upshift). Then I do this 15 weekends a year; so 6,000 shifts at redline per year. With probably a few over-rev downshifts.

I've done this for two years on a used engine with the original IMS bearing that already had 94,000 miles before I installed it. And its still running great.

Of course, at this level of use something will eventually fail (probably sooner than later) but its amazing what they'll take.

07-19-2017, 08:26 PM	#5
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	In a racing weekend, I will typically do around 400 shifts near/at redline (every upshift). Then I do this 15 weekends a year; so 6,000 shifts at redline per year. With probably a few over-rev downshifts. I've done this for two years on a used engine with the original IMS bearing that already had 94,000 miles before I installed it. And its still running great. Of course, at this level of use something will eventually fail (probably sooner than later) but its amazing what they'll take. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor Last edited by thstone; 07-19-2017 at 08:32 PM.