‘91 E30
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Fixed, I adjusted the embedded content width to 800px from 500px. Youtube was requesting 560px haha. Car sounds great! I should really come up to Shawano and watch being its 40 min away.
Thanks Chris! Once they start allowing spectators/ride alongs I think it would be worth it.
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Well, measured the breakaway torque of the diff over my lunch...ended up ordering a 3 clutch setup from Thayer Motorsport and everything I need to replace the leaky input shaft seal. Should be a fun project
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What was the breakaway #?
40ish on a cold diff. I noticed throughout each run it would slip more and more. Based on what I could find on metric mechanic for a 2 clutch diff w/45° ramp angle in good shape It should be around 58ftlbs.
Doesn’t spec e30 cap it around 65ftlbs?
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40ish on a cold diff. I noticed throughout each run it would slip more and more. Based on what I could find on metric mechanic for a 2 clutch diff w/45° ramp angle in good shape It should be around 58ftlbs.
Doesn’t spec e30 cap it around 65ftlbs?
Science!
I wonder why the MM units have a lower breakaway torque though?
I've had this happen a couple times, but I just figured it was just a compromise with F/R handling bias. You could get more weight on the inside rear by removing the rear sway bar, but yeah, no thanks.
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Science!
I wonder why the MM units have a lower breakaway torque though?
I've had this happen a couple times, but I just figured it was just a compromise with F/R handling bias. You could get more weight on the inside rear by removing the rear sway bar, but yeah, no thanks.
Ramp angle & less initial lockup is my guess
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Doesn’t spec e30 cap it around 65ftlbs?
Yep that's why I asked. I was curious.
Per the latest rule set: test "at the center hub nut, using a 30mm or 32mm socket and commercially available ½” torque wrench. The car will be placed on solid pavement, the right side of the car will be jacked up until the right rear tire is free from the pavement, the transmission will be placed in neutral, and the parking brake, if present, will be released. The torque wrench will be placed at the nine o’clock position with the socket on the center nut. The torque wrench will be set at 65 lb.-ft. and pushed down.If the differential does not breakaway prior to the torque wrench “breaking away,” a second and similar style torque wrench from an impartial party shall be used in a second test, immediately following the first test. If the differential does not breakaway using the second torque wrench, the car will be disqualified from the preceding race and the DQ will be noted in the car’s logbook."
I replaced my original after a wreck in 2014 with a used 3.73 only to find that it tested at 44ftlbs. Not good. My current one is a used Korman-built 3.73 that tests at 65ftlb. Much better.
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Yep that's why I asked. I was curious.
Per the latest rule set: test "at the center hub nut, using a 30mm or 32mm socket and commercially available ½” torque wrench. The car will be placed on solid pavement, the right side of the car will be jacked up until the right rear tire is free from the pavement, the transmission will be placed in neutral, and the parking brake, if present, will be released. The torque wrench will be placed at the nine o’clock position with the socket on the center nut. The torque wrench will be set at 65 lb.-ft. and pushed down.If the differential does not breakaway prior to the torque wrench “breaking away,” a second and similar style torque wrench from an impartial party shall be used in a second test, immediately following the first test. If the differential does not breakaway using the second torque wrench, the car will be disqualified from the preceding race and the DQ will be noted in the car’s logbook."
I replaced my original after a wreck in 2014 with a used 3.73 only to find that it tested at 44ftlbs. Not good. My current one is a used Korman-built 3.73 that tests at 65ftlb. Much better.
Phew, glad I tested it correctly lol.
also glad to hear you could feel how sloppy it was around 40ish, confirms my suspicions. -
Ramp angle
Hmm. Learned something new today.
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Hmm. Learned something new today.
Ever since Sunday I have been trying to school myself in differentials. It’s mostly black magic and gear lube
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there was once the most elaborate e30 m3 restoration thread on r3v maybe 7-8 years ago which I remember having great detail for the diff rebuild. Its so nice that EVERYTHING on a BMW is so well documented with multiple sources, so here’s the next best thing I have found.
http://buildraceparty.com/diy-tech-how-to-rebuild-a-bmw-e30-differential/
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there was once the most elaborate e30 m3 restoration thread on r3v maybe 7-8 years ago which I remember having great detail for the diff rebuild. Its so nice that EVERYTHING on a BMW is so well documented with multiple sources, so here’s the next best thing I have found.
http://buildraceparty.com/diy-tech-how-to-rebuild-a-bmw-e30-differential/
I’ll be using that one, Thayer’s instructions and copious amounts of photos. @AsparagusMike just recently did his as well and has some photos.
this one has a helpful parts explosion and then turns into an ad for MM.
https://metricmechanic.com/wp-content/uploads/2015/10/Differentials.pdf
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I also forgot to mention I ended up going with the “performance” 3 clutch setup instead of the “street” 3 clutch setup. I was worried about too much lockup (similar preload as a 2 clutch, but now with 3 discs) inducing understeer on turn-in
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This may seem dumb but I finally found a usb charger that doesn’t look like a giant tumor with 6 bright LEDs sticking 8” off the console.
https://www.amazon.com/gp/aw/d/B00M6QODH2?psc=1&ref=ppx_pop_mob_b_asin_title
diff refresh parts are slowly rolling in as well. Hopefully have everything by Tuesday
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This may seem dumb but I finally found a usb charger that doesn’t look like a giant tumor with 6 bright LEDs sticking 8” off the console.
I bought the exact same one a couple years ago for the same reasons. Still charges things. Since it only has one job, that's a win in my book.
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Road America was a lot of fun. Surface was slick like usual since the repave.
raw: http://fvscc.com/results/2020_Summer/Event1_raw.htm
class: http://www.fvscc.com/results/2020_Summer/Event1_fin.htm
My fastest run:
It was good seeing @AsparagusMike & @suspenceful out and about. Veggie mikes car sounds great as always and Spence’s ///m looks glorious
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Road America was a lot of fun. Surface was slick like usual since the repave.
raw: http://fvscc.com/results/2020_Summer/Event1_raw.htm
class: http://www.fvscc.com/results/2020_Summer/Event1_fin.htm
My fastest run:
It was good seeing @AsparagusMike & @suspenceful out and about. Veggie mikes car sounds great as always and Spence’s ///m looks glorious
Those pesky S2000s
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