Hey who has experience with this? Sounds like it could make the car a little more fun. Who needs gas mileage anyways?
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Who's running a 4.44 diff?
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I replaced my 4.10 in my 318is with a 4.45 from an auto 318ti. I prefer the 4.45 ratio for acceleration and driving around town. Revs a bit higher on highway and maybe burns a tiny bit more fuel but the m42 is efficient enough anyway. Buy a diesel or a hybrid if youre that worried about efficiency.
Except both of my diffs are open so they kind of suck.
Do it!sigpic
1991 318is x 2 .
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I have had mine installed for about 6 months. In that time I've put about 5k miles on the car. During that time I averaged 24.2 MPG, and achieved a downhill top speed of 128 MPH, flat road was closer to 115 MPH. Revs are up to about 4-5k in highway driving (65 MPH limit roads).
Is it worth it? If you DD the car then hell no, it sucks fuel, and is very hard on the engine and I have noticed increased oil consumption. If you don't DD it you'll love it as it takes the already manic nature of the M42 and just cranks it up. Also, autocross is the perfect venue for a 4.45 rear end car. Of course there are always those Mazda guys with 5+ to 1 diff ratio...
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In my old 318is I went from an open 4.10 to open 4.27 and didn't notice a huge difference in acceleration. It did bump up the revs on the highway which was a bummer, but to be expected. In my current car I have a medium case 3.73 lsd and absolutely love it for highway driving and better cornering. It also doesn't feel any slower than my last one. I actually prefer the longer gears for winding it out. As others have said, the 4.44 is probably best for autocross or just around town thrashing.'91 318is
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