Taller final drive ratio available? Options

[Mid_Engine_914]

I was looking through the PET catalogs for the early 911/912s and later 911s and saw that there is a ring gear and pinion shaft listed with a ratio of 7:27 or 3.857:1 which is taller than the 914's stock 7:31 (4.429:1) ratio. Will this ring gear and pinion shaft work in the 914's 901 tranny?

[Mid_Engine_914]

Those acceleration numbers were based on a 4000 rpm launch, 'typical' shift time of 0.4s and full lift of throttle during shifts. I then reviewed the recommendations (below) on Renegade Hybrids' site and used DRA to estimate the acceleration times without using first gear, stock final drive ratio, soft compound 205/50-15 street tires and 50% posi and it estimates 0-60 in 4.9s and the quarter mile in 13.2. So I'm assuming it should be ok with a fresh tranny rebuild.

By now, you have probably been well educated on the limitations of the stock 914 transaxle. If not, here is a quick recap...

1. Don't use 1st gear period.

2. 300 HP and 300 FPT are the streetable limitations.

3. Shock loading will kill the tranny in no time.

4. No speed shifting or excessive abuse.

5. Have your 914 tranny converted to a four speed with taller gears by Renegade if the following scares you!

[Mueller]

So I'm assuming it should be ok with a fresh tranny rebuild.

that makes me laugh and wonder after how many miles/launches will the transmission still be a "fresh rebuild"??? (IMG:style_emoticons/default/biggrin.gif)

at some point, the transmission will no longer be "fresh", do you limit your 4000rpm launches to 5, 10* or ???

or will you just do it once to measure the numbers to never repeat them again??

*bmw has an electronic counter that only allows 10 "F1" style starts in thier SMG equipped cars....supposedly the clutch turns to jelly after that number..