Quote:
B210sleeper wrote:
what gearing is ideal? I have an HA37. Higher final drive numbers = lower top speed / more torque?
Ideal gearing? Thats a hard one. If you are into short trips, like in drag racing, then the lower ratio's like 4.11 to 1 or even lower, will work well. For general road use, particularly in an urban environment, then 3.9 to 1 seems to be a popular shoice.
If you live in a country area like me, where longer distance driving is the norm, then 3.7 to 1 may be a better choice. Lower ratios provide faster acceleration & better hillclimbing, but lower speeds in all gears.
Higher ratio's, like 3.7 to 1 translate to slower acceleration, but better cruising.
Wheel & tyre diameter is also used for gearing changes. The larger diameter tyre increases overall gear ratio & is good for touring/ cruising, while smaller diameter tyres give better acceleration, but lower speeds, so are better for drag racing.
Your best bet is often to just drive it & see how it feels. If you are always looking for another gear, like i was, then you need taller tyres, and/or a higher diff ratio.
If you hardly ever get it into top, & feel a desperate need for more "G's" when you hit the pedal, then smaller diameter tyres and/or lower diff ratio should be on your shopping list.
Sounds to me like you need taller tyres.
There is a 3.54 to 1 ratio in existance, in the H150 diff format, & that seems to be the diff size you are using already, so if you can find one, then [A] Use it & [B] tell us what it comes from, because i am interested in this ratio for my car.
Hope that helps.
P.S. Can you get a speedo from another version of your car with a higher speed indication? Even the humble Datsun 1000 had speedo's with 100mph markings.
R-Fast
The 1200's track is about 60mm wider, but i will stick with what i have for now, unless it proves to be a problem. The smaller, original, rear axle & diff offers a lower unsprung weight, which translates to better ride & handling. I never broke anything in my sedan, with it's original rear end & the 1200's H145 diff of 3.9 to i ratio. The only real reason for the H150 diff change is to get the higher 3.7 to 1 ratio.
Transfer
