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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 02-28-2017, 12:13 AM   #1
2004zhp
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LSD units

What kind of set up are people running for hpde tracks?
I have been reading a lot on lock up and preload. Seems like the sweet spot is 40% lock up. But I'm wondering what everyone is running or how they are set up.
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Old 03-03-2017, 07:18 AM   #2
pvaultguy
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I plan to go with the Spec E46 diffsonline from bimmerworld
http://www.bimmerworld.com/SpecE46/B...ferential.html


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Old 03-04-2017, 11:07 AM   #3
Feffman
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I run a Drexler from the good folks at Autotech (http://www.autotechdriveline.com/drexler.htm) in my M3 racer.

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Old 03-15-2017, 09:19 PM   #4
I8UR911
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Quote:
Originally Posted by 2004zhp View Post
What kind of set up are people running for hpde tracks?
I have been reading a lot on lock up and preload. Seems like the sweet spot is 40% lock up. But I'm wondering what everyone is running or how they are set up.
I run Diffsonline's 3 clutch variable ramp 3.46 r&p diff in my SE46. I also opted for polished r&p and bearings as well given that it's a track/race car.

Don't read too much into lock up, etc. If you have any big questions just call Dan @ Diffsonline (he builds most of the diffs sold by the big companies.... Turner, Bimmerworld, etc).

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Old 03-22-2017, 10:51 AM   #5
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Originally Posted by I8UR911 View Post
Don't read too much into lock up, etc.
Could you expand on this?
Obviously almost any LSD will be a huge improvement over an open diff, but the engagement still seems like a pretty important point. Where the sweet spot is would be pretty variable depending on track types and driving styles though I would suppose.
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Old 03-22-2017, 01:04 PM   #6
I8UR911
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Originally Posted by CrowsFeast View Post
Could you expand on this?
Obviously almost any LSD will be a huge improvement over an open diff, but the engagement still seems like a pretty important point. Where the sweet spot is would be pretty variable depending on track types and driving styles though I would suppose.
I say don't worry too much about lock-up because a lot of people will over analyze differentials and likely buy something that is WAY more than what they need.

Again, the guy to chat with is Dan @ Diffsonline. He has a small "Technical Information" page on his site; http://diffsonline.com/bmw-different...formation.html.

I don't want to lead on that I'm a diff guru (far from), but I know that Dan builds some of the best diffs in the country.
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Old 04-17-2017, 07:17 PM   #7
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I ran a Metric Mechanic 3 clutch 3.15 diff. It was a great upgrade and a nice ratio for the street and track.

If you have a 6 speed...you can bolt on an M3 rear end and driveshaft. No mods. LSD included.
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Old 04-17-2017, 08:40 PM   #8
I8UR911
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If you have a 6 speed...you can bolt on an M3 rear end and driveshaft. No mods. LSD included.
Not sure I agree with this unless you mean "bolt on" the entire M3 rear subframe.......???

E46 M3 rear diff does not simply bolt up to non-M rear subframe.

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Old 04-17-2017, 11:34 PM   #9
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Not sure I agree with this unless you mean "bolt on" the entire M3 rear subframe.......???

E46 M3 rear diff does not simply bolt up to non-M rear subframe.

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Entires rear end - subframe to brake rotors.


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Old 05-24-2017, 07:28 AM   #10
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Wavetrac vs M Factory

Has anyone compared Wavetrac to M Factory?? Thx.
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Old 05-27-2017, 10:26 PM   #11
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I had the wavetrac out on the track today and I loved it. But, I don't think I lifted a wheel so it probably performed the same as an MFactory or other helical diff
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Old 05-29-2017, 06:16 AM   #12
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No meaningful difference between a helical like MFactory and the Wavetrac unit. Pick whichever one you prefer and go with that. The MFactory helical appears very well built and is an easy install.

For lots of hard track or autocross use, go with a Blanton or Diffsonline LSD. Jim can set you up with a diff that uses larger spider gears from the M 210mm diffs which will be much more durable than anything in the MFactory clutch diffs. This is important if you start hitting curbs on track which shock loads the LSD. The MFactory clutch diffs work well but they are more fragile. They use standard sized spider gears which don't stand up well to a lot of shock loading.

For setup, it comes down to personal preference... I like a 1.5 way diff with 80-100lb-ft static preload (breakaway torque), 45 degree ramp on accel and closer to zero on decel. Some people on track like a two way diff with less pre-load and 45 degree ramps on accel and decel, this makes the car more stable when braking from high speeds, but it hurts turn-in. Either way if you get it close you can always tune it with what fluid you run.
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Old 07-12-2017, 06:30 PM   #13
elgreengo
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Syncro Design Works builds great e46 differentials!
From helical to clutch type, including Drexler race units.
http://https://m.facebook.com/SyncroDesignWorks/
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Old 07-13-2017, 12:00 AM   #14
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Syncro Design Works builds great e46 differentials!
From helical to clutch type, including Drexler race units.
http://https://m.facebook.com/SyncroDesignWorks/
i can't get your link to work.
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Old 07-19-2017, 05:41 AM   #15
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Kaaz

After a lot of research, I ended up with a Kaaz unit. My 330Ci is built with Spec e46 in mind.

I went for the competition version. I have 2 autocrosses (plus 250 street miles)and a Track Night America at CMS on it and am very pleased. It is noisy as expected but I don't have a problem with it. They have a coated version that is supposed to be quiet but I wanted the best possible performance option.

Installation was easy but I've done this before.

I don't have experience with the other manufacturers, but I can't imagine an easier or better alternative.
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