Reply With QuoteJeff, what is the current stock gear?
Grand Master
535, manual tranny and 3.76 and 3.91 rear ends
I think a few of you guys (JoeS, Robin, Dave R, others?) are running either a 3.76 or a 3.91 rear end. I'm considering upgrading and am trying to decide which one I want.
I'm leaning towards the 3.76 unit as I think the 3.91 is a bit too short. Likely makes first gear pretty unusable.
Can I get some comments from you guys who are running the shorter rear ends on what you like / don't like about the ratios? Street vs. Highway, usablity of the gears, other comments...
thx!
Jeff
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy
Green Beret Special Ops
Jeff, what is the current stock gear?
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
Big, Big Time Poster
That's what I've been wondering.
Grand Master
I put a 3.73LS in at the beginning of summer.
It's a noticeable improvement. I do a lot of highway driving and don't mind it at all. 80mph = ~3500rpm IIRC. Dave Rutkowski has a spreadsheet to calc that stuff, and I volunteer him to give you the rundown in each gear.
Whatever you do, don't do what Martin did.....he really missed the boat by going with a 3.64
Big Time Poster
3.73 is not that bad in first gear
It is definately short of the line, but for cruising the parking lot is just fine.
One thing for sure..... It will certainly jerk you right out to the hole. I would say that a 3.91 would be useless. I ran with my 4.27 on the manual tranny for about a month. First gear was useless, so since the difference between the gearing is about 9%, i can imagine a 3.91 being close to enjoyable.
Attached ( i think - is spread sheet for comparing RPM)
Change the txt extension to XLS, since we can not upload XLS extensions.
Last edited by JoeS; 08-23-2004 at 01:11 PM.
JoeS
_____________________________________________
Major Contributor
Agreed Scott, yet another bad decision on my part. Let's not learn anything, eh?
Jeff has driven my car with the 3.64 enough to be afraid of the 3.91 or lower gears. That 3.64 lsd trigger was pulled with the knowledge that it was from a low torque m20 in good condition; it was a good price, and it was replacing an open 3.4. It is too bad there isn't a close ratio gearbox reasonably available for the m30.
Took the fam on a weekend trip to west WA. The 535 is great on those 2 lane roads. The roll on power in 4th really shines with the maf & that 284 cam. The brake squeal seems to be gone with the Bav Auto brass caliper bushings. The front 850 calipers have Hawk hps pads.
Originally Posted by Scott H
blah blah blah...
Whatever you do, don't do what Martin did.....he really missed the boat by going with a 3.64
Last edited by Martin in Bellevue; 08-23-2004 at 02:25 PM.
erased due to slander
Grand Master
3.46 (n/t)
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy
Grand Master
sheesh Martin, testy today?
Major Contributor
It is tough watching friends make the same mistakes that I made years ago.
I'm just upset because I care.
Run you bastard, RUN!!!!
erased due to slander
Martin, as an FYI -The brake squeal seems to be gone with the Bav Auto brass caliper bushings.
I have those in my Z3 Roadster - be sure that you keep a maintenance schedule on those to keep them lubed. I had a caliper 'stick' because I got a bit too lazy with that, wore down 1 of the pads and scoured a rotor. (driver's side outer, obviously not the side with the sensor). So now I make sure to pull off the wheels, clean the guide pins/bushings and throw some hi-temp anti-sieze in those things every 3 oil changes (about 9500-10k mi).
They are great, but they are NOT a non-maintainence item.
Eric
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