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thinair
10-15-2004, 03:26 AM
I'm selling my 3.15 limited slip differential. Once I pull it out of my car I will put in fresh fluid and a friction additive. The diff has had the oil changed once a year.

First $600 takes it. I'm pretty firm with the price.

I'll take pics once I have it out of my car.

SpoolinS6
10-15-2004, 03:49 AM
:o Whats Going In ?

qwk325
10-15-2004, 09:37 AM
I'm selling my 3.15 limited slip differential. Once I pull it out of my car I will put in fresh fluid and a friction additive. The diff has had the oil changed once a year.

First $600 takes it. I'm pretty firm with the price.

I'll take pics once I have it out of my car.


Whats going in it Nelson ????????

greekthang
10-15-2004, 10:24 AM
I'm selling my 3.15 limited slip differential. Once I pull it out of my car I will put in fresh fluid and a friction additive. The diff has had the oil changed once a year.

First $600 takes it. I'm pretty firm with the price.

I'll take pics once I have it out of my car.


PM'D you Thinair

Miguel
10-15-2004, 10:50 AM
3.15?? you must have had a HIGH top speed!

greekthang
10-15-2004, 11:17 AM
3.15?? you must have had a HIGH top speed!

Actually Miguel thats not really correct pal. At a 3:15 gear ratio you lose a bit of top end. The higher the ratio 3:23, 3:73, 3:91 the more and more top end you lose. Example a 3:91 gear ratio is amazing for acceleration but for top the car would be screaming at 200km/h at 6000rpm.

Miguel
10-15-2004, 11:52 AM
Actually Miguel thats not really correct pal. At a 3:15 gear ratio you lose a bit of top end. The higher the ratio 3:23, 3:73, 3:91 the more and more top end you lose. Example a 3:91 gear ratio is amazing for acceleration but for top the car would be screaming at 200km/h at 6000rpm.
exactly... whcih is why a 3.15 would reach a higher TOP SPEED than say a 4.10.

greekthang
10-15-2004, 11:56 AM
exactly... whcih is why a 3.15 would reach a higher TOP SPEED than say a 4.10.

Obviously Miguel but I dont think Thinair had a 4:10 in there . I was assuming that his diff was a stock unit and he upgraded to the 3:15 LSD. Much better choice anyways thats why I want it. :D

Bruno
10-15-2004, 03:34 PM
isn't the 3.15 the stock ratio for 325 and 328? I want a 3.46 for my race car, but it has to be custom made.

greekthang
10-15-2004, 03:42 PM
isn't the 3.15 the stock ratio for 325 and 328? I want a 3.46 for my race car, but it has to be custom made.

No pal the stock diff on my car I believe is a 2:93 non LSD so the M diff is far more superior then the stock one. Way better off the line launch due to the better gearing and most important the LSD

Bruno
10-15-2004, 03:55 PM
true, the 328i has a worse differential. The 325 was lucky and the M3 (some) had the 3.25 then you jump to the wooping 3.91... nothing in the middle.

greekthang
10-15-2004, 04:02 PM
true, the 328i has a worse differential. The 325 was lucky and the M3 (some) had the 3.25 then you jump to the wooping 3.91... nothing in the middle.

Well I wouldn't say the worst but not the best. My car has killer long gears and runs amazing on the highway but off the line it suffers a bit

thinair
10-16-2004, 01:53 PM
Hey guys, I just got back from a 1 day trip to brooklyn, to pick up a 3.38LSD from an auto M3. (Don't every try to go to NYC and back in one day *sleep* ).

But as Greekthang said, the stock 2.93 (in the 328) is pretty tall, it's great for fuel economy, but I think BMW chose it because if they had put the same 3.23 they had in the M3's, the performance numbers would be so close that more would have bought 328's. The 3.15 diff made a nice difference, especially with the limited slip. The 3.15 is 7% shorter over the stock diff, which improved my acceleration a lot, but reduced my theorhetical top speed. For the times i'm above 240km/h, I don't think it matters, plus I don't think my car would even pull to redline in fifth with either the 2.93 or the 3.15.

The 3.38LSD I just bought will shorten my gearing another 7%, which will give me even more acceleration, and less top speed (it should hit 240km/h @ 7000rpm). My only real complaint is that it will lengthen my 0-100km/h times, because my 2nd gear won't reach 100km/h or 60mph anymore. It will improve all my other times though. I can't wait to try it out. I can't wait to hit up the drag strip either (next weekend hopefully), see if I can get myself into the really low 14's, or even a 13.999 :)

Also, with a 3.91, I'd be limited at like 180km/h at redline in fifth, and I don't even want to imagine what rpm I'd be cruising at when doing 120km/h on the highway.

greekthang
10-16-2004, 02:10 PM
Hey guys, I just got back from a 1 day trip to brooklyn, to pick up a 3.38LSD from an auto M3. (Don't every try to go to NYC and back in one day *sleep* ).

But as Greekthang said, the stock 2.93 (in the 328) is pretty tall, it's great for fuel economy, but I think BMW chose it because if they had put the same 3.23 they had in the M3's, the performance numbers would be so close that more would have bought 328's. The 3.15 diff made a nice difference, especially with the limited slip. The 3.15 is 7% shorter over the stock diff, which improved my acceleration a lot, but reduced my theorhetical top speed. For the times i'm above 240km/h, I don't think it matters, plus I don't think my car would even pull to redline in fifth with either the 2.93 or the 3.15.

The 3.38LSD I just bought will shorten my gearing another 7%, which will give me even more acceleration, and less top speed (it should hit 240km/h @ 7000rpm). My only real complaint is that it will lengthen my 0-100km/h times, because my 2nd gear won't reach 100km/h or 60mph anymore. It will improve all my other times though. I can't wait to try it out. I can't wait to hit up the drag strip either (next weekend hopefully), see if I can get myself into the really low 14's, or even a 13.999 :)

Also, with a 3.91, I'd be limited at like 180km/h at redline in fifth, and I don't even want to imagine what rpm I'd be cruising at when doing 120km/h on the highway.


Check your PM Thinair

thinair
10-16-2004, 02:26 PM
Diff is Sold

Thanks and sorry to those who replied and PM'd.

Waterwings
10-17-2004, 12:27 PM
yeah ask 98323is he has a 3:91 diff in his car. I think he said he can hit 235kmph

///MsAniTy
10-17-2004, 02:14 PM
im prety sure 98323is has a 3.46 diff his ride

Waterwings
10-17-2004, 02:16 PM
naw i know him personally and I'm almost positive he said it was a 3:91

///MsAniTy
10-17-2004, 02:22 PM
ill slap money he posted somewhere that he had either a 3.38 or a 3.46

greekthang
10-17-2004, 03:11 PM
yeah ask 98323is he has a 3:91 diff in his car. I think he said he can hit 235kmph

No chance. At what RPM 10,000 !!!!!

thinair
10-17-2004, 11:22 PM
naw i know him personally and I'm almost positive he said it was a 3:91

Brad has a 3.38