m52/zf trans + 2.93 = too low?

[evil_twin]

wtf motor are you running?

[sushipower]

97 S52, M52 intake, stage 2 cam, 21.5 lbs, porsche 803 maf and UUC flywheel with M5 clutch. current set-up is the same but 540 MAF and turner chip.

[evil_twin]

97 S52, M52 intake, stage 2 cam, 21.5 lbs, porsche 803 maf and UUC flywheel with M5 clutch. current set-up is the same but 540 MAF and turner chip.

You mean m50 intake right?

Damn, you're running many more mods than I am.

Maybe I'll just buy both so I have a spare just in case.

[z31maniac]

w/ a 260, I think the 3.46LSD is the perfect ratio for DD use. That's what I use on my E28 and love it. 3.64 is an awesome ratio too, and IMO is perfect for spirited driving. They are rare as hen's teeth though (3.64LSD) and are only confirmed to be in the 88-89 635csi w/ manual tranny. '84-'85 318i used them too, but they are small cased.

That's what I'm going after, I haven't run the numbers, but I think the 3.64 in combination with 235/40 or 245/40/17 tires should get me close to 60mph in 2nd gear.

[sushipower]

You mean m50 intake right?

Damn, you're running many more mods than I am.

Maybe I'll just buy both so I have a spare just in case.

Correct M50

[Bmjpv]

Try 3:15

I started with the 3:73 (88'325Is standard) next went with the 2:93 which was good. I came across a 3:15 out of a low miles z3 . Great combo with my built s52 and zf gearbox . At this time I've got the 15" e30 m3 rims ,205/55/15 . I got 16/8s to tire soon. Not much said about the z3,3:15s . Joe

[Dissembler]

I don't have excel, so I can only view the diffs online calculator not change it :(

I've got m52, zf tranny and 3.46 LSD with 205/55/15 tires. Could anyone tell me how many rpm I would see at 70 and 80 mph?

What rpm would I see if I was using a 2.93?

I'm still deciding if i want to trade my 3.46 for a 2.93 Unfortunately I have to commute 70 miles by highway everyday for work :(

Edit: This is why I want the 6spd out of a euro M3!!

[m3_eater]

Edit: This is why I want the 6spd out of a euro M3!!

No, you want a US E46 M3 6MT (Getrag S6S 420G). The Getrag trans is the upgraded version of the Euro E36 6-speed, and is better in every way. The syncro problems of the E36 were fixed to solve the miss-shift problems and early wear. Furthermore, it's less expensive to source now that people have been crashing E46 cars for a while in the States.

Oh - and you can install it in your 24V car with all OEM parts and no custom modifications needed (except a professionally shortened driveshaft - but you would need that with the Euro 6MT anyway).

Gear Ratios / Speeds at RPM (Mechanical Only / No Air Drag Correction) for mine:

[rThor432]

^^Aero aside, I'd be good for 210+ if that chart is correct!

[m3_eater]

^^Aero aside, I'd be good for 210+ if that chart is correct!

Yeah, I often get a chuckle about that myself. If only drag didn't increase at a rate equal to the square of your velocity!

...and if only our cars weren't shaped like bricks (what is the average E30's coefficient of drag, anyway?).

[evil_twin]

I started with the 3:73 (88'325Is standard) next went with the 2:93 which was good. I came across a 3:15 out of a low miles z3 . Great combo with my built s52 and zf gearbox . At this time I've got the 15" e30 m3 rims ,205/55/15 . I got 16/8s to tire soon. Not much said about the z3,3:15s . Joe

Joe, thats what I was looking for originally, but the guy I was talking to said he didn't know what model had that ratio. The z3's still have a 4 bolt flange?

[Bmjpv]

Z3 3:15

I got my 3:15Lsd from a knowageable 325 guy that was parting out his 325 a while back. It does have a bar code on the top of the case that says it all for me. I did not ask about Year,model, flanges or rear cover at the time. I was just so happy to make that buy from him because it was a bolt in for me, sorry. If you can't find where this comes from I could Mirror It. Good luck , Joe

[shiboujin]

Currently I'm running zf and a 373 welded diff. It sucks on the highway, but the car will see many days on the track. I'm running out of my power band too quick with my 373.

I'll believe it when I see it :)

[jrdeamicis]

I run a 3.73 with a GTRAG from a 04 330 6 speed.

[evil_twin]

I'll believe it when I see it :)

You will, I promise Donna will be a complete track car when I'm done.

I run a 3.73 with a GTRAG from a 04 330 6 speed.

And you don't think a 373 is too high?