Auto diff on manual car?

[RichardK]

What would the effect be if I put a diff off an auto on my manual S12?

Anybody got any figures or anything?

[wacomuk]

i have a feeling the auto diff has a higher ratio which would give you less mph in each gear (prob only get 60mph in 3rd) but it would feel quicker

it would prob lower your 0/60 time but your 30/70 time would prob improve

[Beany-s12]

i've got that set up on mine and when my speedo says 90 my road angel says i'm only doin 74! and at 34 on my speedo i'm actually doin 30 and thats on standard 15 inch wheels

[smoker]

Did a long run down the M62 today and I was thinking how nice it would be to have a 6th gear or a lower axle ratio to cut the revs down there is easily enough power. For a road car I wouldn't like to have the auto axle ...i don't think the improved acceleration is worth the loss of refinement unless car is mainly for track use to be honest .

[30psi]

Get an FJ20E diff if you want to get the car working through the gearbox quicker

[Sharas]

Originally Posted by 30psi

Get an FJ20E diff if you want to get the car working through the gearbox quicker

The fj diff is diferent?

[30psi]

Yes I used to have one

[Sharas]

Hm... I checked the manual, and the s13 diff is 3,916, whereas the fj is 4,111 (from the topic about ca boxes). So in conclusion i should be geting shorter gear ratios... Not bad, i hope.

[30psi]

How are you using the S13 crown wheel and pinion then?

[Sharas]

Hm... I have the s13 gearbox (its not in the car yet), but diff the will be staying the same, from my s12, if everything fits ofcourse. (im not sure what exactly is crown wheel and pinion, but from what i found realy fast in google, these gears ar in the diff, so im hoping i wont need to change them)