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06-01-2020, 03:23 PM | #89 |
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On one hand you have Mr Bone dogbone kicking ass and taking names with his E90 with the OSG diff. However, on the other, both Dan from diffsonline and Florian from driftflo both don't like OSG.
Florian/driftflo even tests at least 2 OSG configs and says they both aren't very good. I suspect almost anything is better for serious track use than the OEM one |
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06-01-2020, 03:25 PM | #90 | |
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I also do not want random people assembling the diff incorrectly |
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06-01-2020, 04:03 PM | #92 |
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nicksm3 I feel your pain on all this stuff lol. The world of learning diffs is endless! I've been casually shopping for my car and leaning towards the Drexler setup from Driftflo. It seems to be the best bang for the buck and ability to customize for your setup.
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06-01-2020, 04:16 PM | #93 | ||
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It is easier to get more lockup with an OS Giken but lock % is only a part of the equation. The ZF allows easy tuning of the ramp angles and preload. If lock up was the most important feature then you'd go with the OE M-Lock which locks up to 100%.
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06-01-2020, 04:21 PM | #94 | |
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According to this calculator (which I've found to correlate pretty closely to real world in the past), a 3.62 should be good for 171mph with a 24.7" tall 285/30-18 in 7th which is enuogh for any sedan car making under 500whp just about anywhere, if it's running a wing anyway www.bgsoflex.com/auto.html
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06-01-2020, 04:27 PM | #95 | |
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06-01-2020, 04:38 PM | #96 | ||
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and 8300 rpm: . |
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06-01-2020, 04:47 PM | #97 | |
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Both units work well, the OSG has TONS of setup options and most people get them really wrong, which is why OSG has started only doing tuning in-house and being very tight-lipped on setup info. There are different ramps, preloads, clutch active/deactivated configurations, and delay springs all as tuning options is the OSG... And its very easy to go the wrong way or go way too far and have a diff that doesn't work. Both Florian and Dan probably cannot get the parts to tune an OSG anymore, so it would make sense for them both to focus on offerings they feel they can tune and dial in well for a customer. I considered all the options when I bought the E92 diff. I probably would have purchased an OSG based on my experience with them in the E36, but they were out of stock and had a long lead time... and I'm impatient. Plus Florian has really given a lot of his time and information to the community here and I'm happy to support that!
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06-01-2020, 05:01 PM | #98 | |
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Although then that begs the question, the OSG is dirt friggin cheap at ~2k. The Drexeler is ~6k, the Race Carrier Diffonline one is even more. |
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06-01-2020, 05:41 PM | #99 |
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Did the price/exchange rate change recently? I got the 8-clutch "GT Race Light" diff with bearings, seals and drive flanges for 3000€ (~$3500 USD at the time) to my door. I assembled it into my stock housing, but that would be the case for an OSG as well.
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06-01-2020, 05:52 PM | #100 | |
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The usd to eur is getting close to 1:1 |
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06-01-2020, 05:53 PM | #101 | |
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06-01-2020, 05:58 PM | #102 | |
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The LSD unit itself was listed at $2100 euro on my bill, so I'm just not seeing where the OSG is a whole lot cheaper at ~$1800 USD. The OSG still needs bearings, seals, etc plus a ring & pinion and assembly.
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06-01-2020, 09:11 PM | #104 | |
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The lsd itself is 2100Euro Then the different final drive is 500E, the used pumpkin is 1000E, install/etc and shipping takes you to 5k So maybe the drexeler diff is the same price as the osg |
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06-02-2020, 09:17 AM | #105 |
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When I was shopping for a fully built diff with R&P change for the E46, Drexler was around $5k-$6k, OSG was a little under that, and I ended up sourcing a racingdiffs rebuilt ZF and all the parts and had a local guy build it for $3k. Dan's pricing just couldn't compete.
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06-02-2020, 12:17 PM | #106 |
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Lots of good info in here. What are you guys doing to make the speedo read correctly? Is that taken care of with the trans tune?
Anyone that's done a final drive change on a 6MT car have comments? I know lots of guys just don't care and a shorter final drive just means the speedo reads high so no real worries of getting pulled over by surprise. My car will always see lots of time on the street so I'd like everything to work as if it's OE. My last S2000 had a geared diff and there was an easy inline solution (https://modifry.com/index.php?route=...=61install.htm) Just turn a few knobs and it would just alter the signal going to the speedo. Has anyone done anything similar? Of given that it's a European car where you can code and change so much already, is it possible to do OE?
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06-02-2020, 12:30 PM | #107 |
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Why would anything need to be changed for the speedo to read correctly? Am I missing something? I've never heard of a final drive swap causing issues with accurate speedometer reading - at least with BMW's. Maybe it's different with Hondas?
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06-02-2020, 12:34 PM | #108 | |
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I can tell you though for a fact that my car running with a 295/30/18 rear tire has the speedo reading high by a fair bit....when the speedo says 80 I'm only doing 73-74-ish....the smaller tire in some ways is like shortening the final drive.
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06-02-2020, 12:37 PM | #109 | ||
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06-02-2020, 12:49 PM | #110 | |
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That said, I have to imagine the speed sensor has to be calibrated on some level to some kind of fixed number like tire diameter or final drive so any change should throw that off. I wouldn't think the car would just know.
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