What final drive

[bowtie2bimmer]

What would be the best gear for autocross for a 87 eta? (not super eta or 2.7i or anything like that)... It's a dedicated car so I don't care about driving around town just the track. It current has a 2.93 lol

[cheapshot]

4.10

[Nsquared97]

What would be the best gear for autocross for a 87 eta? (not super eta or 2.7i or anything like that)... It's a dedicated car so I don't care about driving around town just the track. It current has a 2.93 lol

Really depends on the type of courses you see. If your out at faster national level events, you may want a 3.73 or even 3.46 so that you don't top out in 2nd gear. But at the same time if you are only doing local, smaller events, you may want a 4.10 for better accel. Just be aware that with most racing bodies changing the final drive can change what class your in.

[619E30]

3.73

[bowtie2bimmer]

is that something I can get classed up for? Would they be able to tell?

[Nsquared97]

is that something I can get classed up for? Would they be able to tell?

What organization do you run with? I am mainly familar with SCCA, but I believe changing final drive gives you points in BMWCCA as well. If you run SCCA events, what class?

And in all honesty, no most people would never have a clue. And if your only doing local events I highly doubt anybody would care. Easiest way for anybody to tell would be to check the tag, but in theory you could just swap that too.

[bowtie2bimmer]

it would be local... gonna get the feet wet.

I've been out in others peoples cars but never my own so learning what I can and cant do...

[Nsquared97]

Then to be honest I would just leave the car and get lots of seat time. The $200 or so you would spend on a diff is better spent on doing more events if your just starting out.

[Click]

Then to be honest I would just leave the car and get lots of seat time. The $200 or so you would spend on a diff is better spent on doing more events if your just starting out.

This. But eventually that 2.93 is going to have to go. Just don't rush it.

[Grand525]

3.73

[Gary Horneck]

3.73 and chipped. A chip and the 2.93 is very fun also. Its a leave in 2nd, and concentrate on driving ratio. I never really got too much wheel spin with the open rear. I swapped to an LSD for RallyX traction.