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Re: T-56 or a 5 speed?
[Re: finadk]
#1092507
11/04/11 03:47 AM
11/04/11 03:47 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
YOu need to figure out what is the lowest RPM your car can pull, and keep in ming that if the engine is lugging you may get worse fuel mileage than spinning it at higher RPM.
Yup, and I hope anyone smart enough to do their own 6-sp install would have the foresight to take into consideration how low of a rpm you can really run your engine before you start dropping below your efficiency zone. Camshaft and carb type or efi will make the difference in this case. I think you would need a 4.10 or numerically higher gear with a .5x 6th gear.
Also, I believe the OEM T-56's in the gto, cadiallac cts-v and the camarobirds had a .57 6th gear ratio.
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Re: T-56 or a 5 speed?
[Re: DennisH ]
#1092510
11/05/11 10:00 AM
11/05/11 10:00 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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the TKO I had with the .64OD was too much for me with 3.21 gears, and was just right with 4.56s. with a 6th gear OD in the .5x range I'd have to have run 4.88s!!
3.21s my 5th gear was lugging at 1800 rpm at 60mph and I had to get up to about 75mph to get the engine to smooth out.
4.56s was a smooth 2400 rpm at 75 mph. perfect!
that was with a 28" tire too, so a shorter tire will help out.
**Photobucket sucks**
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