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View Full Version : Stock Gear Rat. vs Lower/Higher

USMC318ti
04-01-2006, 03:16 AM
What is the stock gear ratio on the ti's?
I drive at high speeds quite often when taking
long journeys, or even putting around town.
I frequently drive at 115mph, but dont like
the screaming RPMs, but i dont want to lose
much acceleration.
Whats a good medium? And which LSD has
that good ratio in it?
GDB
04-01-2006, 04:24 AM
5th gear is a 1:1 and the rear end is a 3.45:1 for the manual and a 4.44:1 for the auto
318ti_Portugal
04-01-2006, 10:57 AM
you could try a Z3 M44 diff. It should lower those rpms a bit but still keep much of the acceleration.
USMC318ti
04-01-2006, 03:47 PM
I knew I should of bought my old car back from my insurance
company for parts!!! (I totaled my Z3 M44 two months ago)
stormos
04-01-2006, 08:21 PM
i've got a Z3 M44 Auto diff on mine ;)

seems good enough.
cali-ti
04-01-2006, 11:39 PM
i'm doubting the z3 m44 diff is a different ratio. anyone know for sure?
m-technik_ti
04-02-2006, 12:19 AM
i'm doubting the z3 m44 diff is a different ratio. anyone know for sure?

As far as i know, m44 z3 & ti diffs are the same...4.44 for the auto & 3.45 for the 5-speed. Just checked Bavarian auto recycling & they sell the same diffs for the z3 & ti as well.
GDB
04-02-2006, 03:41 AM
i've got a Z3 M44 Auto diff on mine ;)

seems good enough.

What kind of top speed do you have with that? Seems like it'd be somewhere around 100mph (180ish in KPH).
cali-ti
04-02-2006, 07:21 AM
What kind of top speed do you have with that? Seems like it'd be somewhere around 100mph (180ish in KPH).
he has an auto trans so whatever the stock ti top speed is :)
GDB
04-02-2006, 10:07 AM
he has an auto trans so whatever the stock ti top speed is :)

awww, what's the fun in that :frown:
cali-ti
04-02-2006, 04:33 PM
well, at least he can hear now. i guess his original diff was grinding pretty badly. i was hoping he could source a LSD, but he couldn't find one in a short amount of time and needed to get it replaced asap.
stormos
04-02-2006, 05:05 PM
still looking for an LSD of coarse.... :)

but i have many other things that also need to be addressed.
gooten1
04-03-2006, 06:09 AM
The top speed should wind up around 130 limited by gears I believe. It hits that electoronic governor at 115, but looks like it could wind out just a tad more before running out of gears.

If you wanted a lot faster acceleration, you could go with the shorter gears of the auto diff on a manual car...or if you wanted more top end on an automatic, switch to the taller gears of teh 3.45. It depends on what kind of driving you do. I would like to lower the ratio a bit (maybe down to 3.10) to let it cruise on the highway more.