Okay so like Im going 60mph and the motor is at 4500 on the tach. What diff do I need to be able to drive on the freeway. I think 3.46 diff could work, what car did this come from? So I thought 16 " rims would help out but it doesn't. First gear is like useless and I can drive in 5th from light to light. Any Help?
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Last edited by e30 blue; 01-08-2010, 07:01 PM. -
get something from a eta, around a 292 or something? -
3.25:1 will get you closest to stock ratiosComment
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I have M50 + ZF + 3.25 LSD and it is perfect!
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My '69 Chevelle SS had a 3.91 diff and a big block, and obviously no overdrive. Brutal on the freeway, 8mpg or so. This was normal during the muscle car era, nobody thought anything about it."If the sky were to fall tomorrow, the tall would die first."
-Dr. Paul Forrester
Do I LOOK like I need a psychological evaluation???Comment
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I'll trade my 4.10 for your 3.73 hahahahaha
Seriously though, the 3.25 (or 3.23, so close it makes no difference) is the stock M3 diff, but a 2.93 is iirc about the correct rear diff for an M50. I'd go with the 3.25 personally, better acceleration at negligible rpm hit compared to the 2.9x.Comment
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I ran a 3.73 for a while... Onto a 3.46 now.
1st is NOT useless, you just need decent tires and be pretty quick at shifting. It is FAST.Past Car : E30 S50 6 Speed 5 Lug 3.73
Current : Z3 S50 OBD2 (Smog Legal) 6 Speed BBS RN Dual Ear Diff
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BNB Designs
Engine Swaps, Fabrication, Innovation, General Repair
Richmond CA
Julian 848-248-8029
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fast to go through gears, but not faster.No more e30s for me.
88 black BMW OBDII 332is dedicated track [sold]
88 BMW OBDII bronzit 332is [RIP 03/08]
91 BMW 325i [sold]
86 Corolla 'Ae86' HB 20v trd [sold]
http://youtube.com/watch?v=pTj7Hn9v5RsComment
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I disagree. Its all about what you are trying to do, jumping out of a dig the 3.73 is the shit.Originally posted by etxxz View PostPast Car : E30 S50 6 Speed 5 Lug 3.73
Current : Z3 S50 OBD2 (Smog Legal) 6 Speed BBS RN Dual Ear Diff
___________________________________________
BNB Designs
Engine Swaps, Fabrication, Innovation, General Repair
Richmond CA
Julian 848-248-8029
Comment
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Well tits.... look at your sig. 6 speed, 3.73, and s50.Originally posted by jrdeamicis View PostOriginally posted by z31maniacComment
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The 3.73 and the 6 Speed were AMAZING.Originally posted by 87e30 View Post
With a 3.73 every gear pulls like one shorter.
5th like 4th
4th like 3rd....
So 6th was fantastic.Past Car : E30 S50 6 Speed 5 Lug 3.73
Current : Z3 S50 OBD2 (Smog Legal) 6 Speed BBS RN Dual Ear Diff
___________________________________________
BNB Designs
Engine Swaps, Fabrication, Innovation, General Repair
Richmond CA
Julian 848-248-8029
Comment
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Not if you've got an M50 dual mass flywheel. :pOriginally posted by jrdeamicis View Postpaint sucksComment
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Thanks for the information guys.Ya I am running the m50 dual mass.It is good to see what others have run and what they have experienced. Do I need to change the whole diff ? or can the gears be changed? Like in town it is fun but a lot of shift work from light to light . If I need to go on the freeway then I am back to my gas sucking truck. The m50 swap is good as my m10 was on gas (in town that is).Last edited by e30 blue; 01-08-2010, 01:46 PM.Comment
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running same setup as you with dualmass and a 2.93
roughly 65mph in 4th at 3500-4000rpm.Comment
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