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What size alloys to gear up?

Posted: 22 Feb 2008, 22:36
by woodman
Just in the process of a tdi transplant into my high top westy, and was thinking of changing the wheels for alloys, with bigger tyres to gear it up a bit. Just wondering what to go for i.e. 16,17 or 18"? or what fits and does width make any difference?

Cheers. :?

Posted: 23 Feb 2008, 17:38
by Westy.Club.Joker
http://www.miata.net/garage/tirecalc.html

Put in your standard size wheels, then put in what you want to swap it to, and it`ll tell you at the bottom what the overall percentage difference is.

If you are putting in a modern type TDI motor, you`ll need to sort the gearbox ratios etc out to make the most of the changed power and torque, modern motors make all their torque at a lot lower revs than the old diesel motors, which were more like a petrol engine as far as revs go. My T3 is doing 3000 revs at 60 mph, a modern diesel won`t be happy at that, a modern diesel car will be doing 2000 revs or less at 60mph, max torque is usually starting under 2000 revs, which is 40mph in a T3 :(

Posted: 24 Feb 2008, 13:21
by woodman
Nice one! :)

Posted: 24 Feb 2008, 13:22
by Westy.Club.Joker
great invention, that Google :D