Differential Question

dietrich · 02-27-2008, 06:58 AM

Hello All,
I have an 85.5 na auto and I am curious if it is possible to put in a taller gear. I think I have a 345. I would want to do some more long range high speed driving. I sometimes wish this car had a 4th gear. I know I would loose some get up and go but I'm not drag racing anyone anywAy. On a slower curvy road I sometimes leave the car in 2nd and sometimes that seems too low. Any thoughts/suggestions would be appreciated.
Regards, Dietrich

944 Ecology · 02-27-2008, 07:20 AM

Nope.

flash968 · 02-27-2008, 07:47 AM

lol - but, if you really want an automatic, you could swap the car out for a 968, which has a 4 spd auto

Makis · 02-27-2008, 08:14 AM

You could go a size up on the tires. This should give almost 5% extra.

flash968 · 02-27-2008, 08:21 AM

does that car have ABS? if so, besides the obvious change in speedo reading, that could mess that up too

dietrich · 02-27-2008, 09:34 AM

To answer the last two post I've got 215/60 on 15" phones front and rear. If I went with bigger tires in the back would that throw off the handling?
According to my tomtom the speedo is a little high (3-5mph).
I don't know if it's abs. It's a late 85.
Regards, Dietrich

944 Ecology · 02-27-2008, 11:32 AM

Quote:

Originally Posted by flash968

does that car have ABS? if so, besides the obvious change in speedo reading, that could mess that up too

85/2 cars don't have ABS.

Makis · 02-27-2008, 02:36 PM

Quote:

Originally Posted by dietrich

To answer the last two post I've got 215/60 on 15" phones front and rear. If I went with bigger tires in the back would that throw off the handling?
According to my tomtom the speedo is a little high (3-5mph).
I don't know if it's abs. It's a late 85.
Regards, Dietrich

You could go fo 225/60/15 and that should give about 2% extra. This is not much really and should not affect the handling too much. If you stick with 215/60/15 at the front the setup could give you more understeer I think.