Mike Simard

I understand there was a batch of 3.09 gears made some years ago.
What became of them?
Is anyone running them?
Are there any sitting around unused that need a home?

Rob Edwards

Hi Mike-

Dunno the current whereabouts, or whether you have the article on them, but here's a pdf copy of said article if you don't already have it. Might provide a lead or contact info.

https://webfiles.uci.edu/redwards/pu...%20Article.pdf

brutus

Rumor was they were so poorly made that everytime you rotated the gears 90 degrees the backlash would be out of spec. So you just used an average and hoped for the best.

White Lightnin'

$2500 for just the 3.09 ring & pinion back in 1999?... damn.

brutus

Just another reason why they were so rare

Rob Edwards

Have you ever held a 5-speed 928 pinion gear in your hand? It amazes me that anyone could even begin to make a few of them, for only $2500.

White Lightnin'

Just thinking what their price would be today...

Speedtoys

My move from 2.2 to 2.73, makes me think that 3.09 would be somewhat annoying.

PekkaV

Hi

In Finland has been made custom 3.7 ring & pinion , and it is used inside of G28/05 gearbox, car was build for racing , first version 928 , 4.7, 2 valve engine, and after engine ( grank ) failure, fellow but Chevy Sb inside, he win few races local V8 class


regards Pekka V

ps. same factory has made gearbox parts for F1 cars

928er

I think that Scott Mohr's car had a set and Jon V ended up with it....

slate blue

Mike as mentioned in my other thread, these people make the ring pinions, ages ago I checked that one of there crown wheels had the same PCD as the 928 and that just leaves them to make the pinion which should just be a modification to an existing program.

http://www.albinsgear.com.au/products_manufacturer.php

slate blue

It shouldn't be too bad, I think Albins sell similar parts for the same price today but back in 1999 it would have been have that price as our dollar was half the American dollar whereas it is parity plus now.

soupcan

Mike is going drag racing......wooohoooo!!!!!

john gill

The ring and pinion is different for auto and manual ,whilst the auto pinion bolts on the output shaft from the auto box from memory , isnt the manual arrangement part of the shaft that support most of the gearbox ratios ?
THerefore would be expensive , it would be great to have the manual arrangement like the auto so you could change ratios a little simpler .
Although either way none of the above is a cheap alternative particularly with such a small market .

mark kibort

why? a 3.09 added to a 2.75 will give an S4 gear box almost idential ratios, sans, 5th. (but a super low hill clibing 1st which would be useless)

a 3.09 to a S4 gear box almost does the same thing it creates the same ratio , BUT, you still have the nasty spacing of 5th from 4th and magnifying the problem, is the fact that you now HAVE to use 5th now. Not good for racing! you want the post shift rpm to be at least 72%, any less and the rpm is too much for the HP curve to support the HP you need to accelerate. interstingly, there is no gain with most 928s to use a close ratio gear box, the HP curve is so broad.

save your money for something that will actually make your car go faster, not for towing a semi tractor trailer up your driveway, or pulling a yacht out of the water .