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Re: C900 T16 primary gears 33/24 etc Posted by Kevin K [Email] ![]() ![]() In Reply to: Re: C900 T16 primary gears 33/24 etc, 85SLED, Thu, 16 Aug 2001 12:37:36 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I think u should have .78 primary's in that 91-na box. Check 3K speed info below. Early spg's had .84/3.67 primary/final, and M89 and later had .78/3.89, for same overall ratios, afaik.
a 1-step primary change gives 8% taller gearing (less revs at speed). this will make 1 and 2 gears more useful/fun on the road, with more boost avail in 2nd. but with loss of torque at wheels in 3 and 4, i would expect 1/4 mile times to suffer.
Reposted from C900 BB ......
Checked workshop manual and various sales spec's. Best I can tell for USA 5-speeds:
-> all c900 turbo and 16V-na had same overall gearing, resulting in 68 mph at 3K rpm. The 8V-na had taller gearing, getting 73 mph at 3K. Seems
euro 16V-T's got this same taller gearing.
-> final drive ratio is 3.89, except 3.67 for M82-88, all markets.
-> USA primary sprocket overdrive ratios:
M80-81, .78 all
M82-88, .84 turbo(all) and 16V-na
M82-88, .78 8V-na
M89-93, .78 all
So to drop revs in M82-88 turbos, just use the .78 sprockets. For others, .72 sprockets are used in M89+ euro turbos, should be getable.
For 8V-na's, mabe change to .84 for more spunk
posted by 52.128....
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