Upgrade Differential

Cool video, can't understand 3/4 of what he's saying, but still worth watching.

...meaning it wears, right? What kind of diff is in M3? 25%, 40%, variable?

what if i want a 3.15 with a quaife already installed so i can just throw it in when it gets to my door? what type of diff is performance gearing using? O and i have a 330 6 speed so will my driveshaft work?

Originally Posted by wtbass21

what if i want a 3.15 with a quaife already installed so i can just throw it in when it gets to my door? what type of diff is performance gearing using? O and i have a 330 6 speed so will my driveshaft work?

You can have Performance Gearing or Diffsonline build what ever you like, it's just a matter of money. Also, there may be shops in your area that have the skill to to build you a great diff. Give great consideration to building a 3.38 or 3.46, because you have a 6 speed. A 3.38 or 3.46 in a 6 speed will feel like my Quaife 3.15 in my 5 speed.

Yea Im just asking if I were to go to performance gearing's site and order one right now what would the internals be, I can't find it anywhere on there as to what internals they use and I want a quaife since this will be a street car. And I considered the idea of 3.46 or 3.23 (used to have 3.38 in my 5spd it was awesome) but I plan to go FI in the future and don't want too short of gears.

Just give them a phone call tomorrow.

Performance Gearing uses a clutch-style, similar to diffsonline or OS Giken. Give Jim a call, he's great to work with. Make sure he understands your application.

hey all, i am just wondering if anyone has any ratios higher than the 3.64. its all the same price on performance gearing from the 3.64 to 4.10 so jw if anyone has experience with a higher ratio.

I went to 4.10, and don't recommend it. To do it again I woulddo 3.83 (or close to it)

What is the gearbox? For 5 spd even 3.64 is way too aggressive. Even 3.46 is too aggressive.

good point on the gearbox

Originally Posted by Nervous

What is the gearbox? For 5 spd even 3.62 is way too aggressive. Even 3.46 is too aggressive.

3.46 isn't to aggressive, unless you plan on driving over 80mph a lot

Originally Posted by vI6ious

3.46 isn't to aggressive, unless you plan on driving over 80mph a lot

Calculate and decide yourself: http://www.bokchoys.com/differential...calculator.htm

For me, 3500 rpm at 75 mph is WAY too aggressive.... On 3.64 it will be 3675 rpm...

well its an automatic, so im starting with a 3.46... also im living in texas so going over 80 is a regular occurance. i also have the conforti software so ive bumped the rev limit to 7000. maybe the 3.91?? which puts me at 3101 cruising at 80 mph

mine's an auto, 3.91 would be my max, 3.8x would be optimum

cool, thanks for the advice guys.