Re: Primary drive change - Saab Saab Model 99 Bulletin Board - Saabnet.com
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Re: Primary drive change
Posted by John Blas [Email] (more from John Blas) on Sun, 28 Dec 2014 13:14:12
In Reply to: Re: Primary drive change, JohnT [Profile/Gallery]
, Thu, 11 Dec 2014 08:27:12
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A chart of gearbox info is in the red 75-80 99 service manual, page 020-17. The standard non-turbo is 31:30 .97. The 1978 turbo ratio is 30:27 .90. The 79> turbo is 31:26 .84. I've upgraded 3 cars to the .84 ratio. I find this a better ratio for the turbo. Especially if you up the boost a bit (remember the US 99 turbo was limited to 82 octane unleaded at the time). .84 gives 66mph and 3000rpm versus the .90 / 62mph / 3K. There's also the 5 speed ratio of .78 but this would be to high.
If you're doing sprocket transplants be sure to include the chains and tensioner from the donor. The chains could be different lenghts.
posted by 107.221.8...
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