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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 01-05-2009, 06:12 PM   #1 (permalink)
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question on differential

I have a question: I changed the differential in my 325, the one I put makes the car quicker now but I don't have top speed anymore, I can only reach 210 km/h. My question is, is there a chip for my transmission that can change the ratio without having to open the transmission itself. I have a manual transmission by the way.
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Old 01-06-2009, 02:26 AM   #2 (permalink)
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Originally Posted by fabcal View Post
I have a question: I changed the differential in my 325, the one I put makes the car quicker now but I don't have top speed anymore, I can only reach 210 km/h. My question is, is there a chip for my transmission that can change the ratio without having to open the transmission itself. I have a manual transmission by the way.
nope. you changed the final gear ratio which will lower your top speed. What diff did you put in? the only way to get your top speed back is to change to a less aggressive ratio.
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Old 01-06-2009, 04:22 PM   #3 (permalink)
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i bet u put a 318is diff on aint you! gives u hell of a lot on pull off but nuffin top end! that diff will just snap on you! get it off put ur 325i back on ASAP
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Old 01-07-2009, 07:05 PM   #4 (permalink)
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aight, thanks a lot for the advice
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Old 01-07-2009, 08:28 PM   #5 (permalink)
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i bet u put a 318is diff on aint you! gives u hell of a lot on pull off but nuffin top end! that diff will just snap on you! get it off put ur 325i back on ASAP
the e36 diffs regardless to gearing are all rated at the same torque handling. the main differences are the input drive flange bolt arrangements and if its LSD or not.

youre just hurting your fuel economy by having a numerically higher rear end. You'd need to be in the neighborhood of 500+ft/lbs of torque before you need to start worrying about killing an e36 diff.
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Old 01-07-2009, 08:36 PM   #6 (permalink)
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did you put in a 3.91 from an automatic 325 or something? Wondering what diff you put in your car.
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Old 01-08-2009, 02:38 AM   #7 (permalink)
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sound like the diff you put in was out of an automatic. 4:10 vs 3:73 There is nothing you can to regain your top speed short of changing the diff again.
I have a diff with 3:73's do you want to some trading?
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Old 01-08-2009, 07:35 AM   #8 (permalink)
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the one I put is a 3:40 from a 95 M3, I guess I should've also changed the transmission.
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Old 01-08-2009, 09:07 AM   #9 (permalink)
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The 95 m3 has a 3.15. The 95 automatic was a 3.23. They probably just told you that it was off an M car to sell you the part. Check the diff, there should be a tag on it (usually hanging off the drain plug if it didnt break off) with something like "3.73" or "S4.10" etc..

Changing the transmission at the same time isnt a magical fix to make your car faster. You did the correct thing, You went with a numerically higher rear end to get more speed out of the power you had available to you. BTW, when do you ever have a need to go faster then 210kph(130mph) anyway? The top speed limiter on your car is set from the factory to limit your car to 230kph.. even with a different diff you're not going to go much faster than your current 210.
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Old 01-08-2009, 09:21 AM   #10 (permalink)
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Ok, thanks Nukeduster, but what I mean is that I red line on 5th gear at 210 and I feel like the car can take much more, don't forget I have a complete exhaust system from Dinan, a cold air intake and a performance chip also from Dinan.
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Old 01-09-2009, 09:28 PM   #11 (permalink)
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If you want higher top speed get a numerically lower diff. You can get as low as 2.79 rear ends for e36's without going custom. This WILL kill your acceleration, and I'd only recommend something that low if you are forced induction of some sort. A 3.15 is about as low as I'd go with any naturally aspirated e36, it'll top out at roughly 160-167mph(270kph) depending on which transmission (zf or getrag) your car has and if it has sufficient top end power.

With my stock ZF S5D 310Z transmission in my 95 m3 with a chip i've hit an indicated 165mph with the stock 3.15 rear end.

A 3.46 is a good combo to get if you can find one, it accelerates a noticeable amount quicker than stock but will still top out at around 130-140mph(225kph) at redline.

YMMV.
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Old 01-18-2009, 06:37 AM   #12 (permalink)
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Quote:
Originally Posted by nukeduster View Post
If you want higher top speed get a numerically lower diff. You can get as low as 2.79 rear ends for e36's without going custom. This WILL kill your acceleration, and I'd only recommend something that low if you are forced induction of some sort. A 3.15 is about as low as I'd go with any naturally aspirated e36, it'll top out at roughly 160-167mph(270kph) depending on which transmission (zf or getrag) your car has and if it has sufficient top end power.

With my stock ZF S5D 310Z transmission in my 95 m3 with a chip i've hit an indicated 165mph with the stock 3.15 rear end.

A 3.46 is a good combo to get if you can find one, it accelerates a noticeable amount quicker than stock but will still top out at around 130-140mph(225kph) at redline.

YMMV.
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