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03-05-2020, 02:51 PM | #23 |
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I have the J-fiber drive shaft for a 6 speed car that I got as part of the group by last year's. Taken it up to 130 and don't have any vibration's at all. Have solid subframe mounts as well purp powerflex diff bushings and no problems on my end.
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03-05-2020, 04:54 PM | #25 |
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I have one the early MFactory CF driveshaft as well and I've definitely been in the speed ranges mentioned throughout this thread (6MT) and haven't had any issues. In fact, I am glad I swapped seeing how the stock ones eventually get U-joint problems and start clunking. I sold my stock DS literally to a guy with a bad U-joint in his. Outside of avoiding that issue, you're literally losing weight in the best possible place on the vehicle with the CF DS. Sorry you're having issues. Maybe buy the new MFactory version? Best of luck!
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03-05-2020, 06:03 PM | #26 | |
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Sooo, if this is indeed true, it could be that J-Fiber was only able to source a limited number of the known 'good' flanges before their stockpile was exhausted? FWIW, I've had my car up to about 165mph w/zero NVH issues. I was trying to organize another GB directly through YCW w/their own in-house Gen II cf d/s, but sadly we weren't able to secure enough buyers to move forward w/the GB. |
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peter de la mare126.00 |
03-05-2020, 06:39 PM | #27 |
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From what I've been reading here and other forums, YCW/MFactory are the only one piece driveshafts for E9x M3 that are consistent and do not give problems.
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03-05-2020, 08:50 PM | #29 |
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03-06-2020, 08:47 AM | #31 |
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Anyone interested can try contacting Michael directly by e-mailing him @ myip@teammfactory.com. I would be more than willing to sponsor another GB for the E46 platform, but someone else would need to jump in to handle the E9X crowd.
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03-06-2020, 09:28 AM | #32 |
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We have the E90/92 MT/DCT driveshafts (Gen.2) in stock and ready to ship. The new batch of 1M fitments will be ready in 2-3 weeks time. No need for a GB, as we sell out of each batch within weeks of them becoming available. Details on the revised design (and how it differs from the Gen. 1) in the 1st post here: https://www.e90post.com/forums/showthread.php?t=1573938
If you are interested in purchasing one, please PM me. Once a batch is sold out, there is a 2-3 month lead time for the next batch (possibly even longer just now due to the virus situation) Unfortunately, in order for us to make a new fitment, we need a minimum of 20 confirmed buyers "per fitment", which is why the 135i/335i fitments are not ready yet. We have the designs done, we even have one of the 335i AT samples ready (and have been actively looking for a tester for the past few months to no avail), but there simply isn't enough demand for them, so is looking more and more like a lost cause there. As for the E46, unfortunately, buyers were fooled by Agemate/J-Fiber and bought into their lies (all because of 1 person who had visited their factory and thus concluded that he knew everything and that it was me that was spreading lies), therefore the same situation stands: we can only start production if we get a minimum of 20 confirmed buyers. |
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03-07-2020, 07:25 PM | #33 | |
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Assuming the one I just received this week is the gen 2? shipping to NY was exceptionally quick!
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07-30-2020, 12:13 PM | #35 |
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Nightmare continues. I shipped it back and they have been avoiding me. I finally got to speak to Jessy and she still maintains there’s nothing wrong, which I guess there isn’t, just that their product is no good for track cars with short final drive ratios.
Apparently it takes 2 months to organise a $1,000 refund. This is also ridiculous. I never want to hear the name J-Fiber again. It’s cost me another $400+ in shipping and import duties over the original purchase price. |
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07-30-2020, 02:01 PM | #36 |
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I am on 3.62 DCT with mfactory gen-1 and at 135-138mph (end of LRP straight) no vibration and 132mph end of NYST straight no vibration
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peter de la mare126.00 |
07-30-2020, 03:23 PM | #37 |
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And I’ve done 150 on the jfiber bootleg version of the mfactory V1, and driven it in -20F and 100F. It’s looking like jfiber is inconsistent in making its own shaft independently and should be avoided.
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peter de la mare126.00 |
07-31-2020, 11:21 AM | #38 |
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07-31-2020, 02:58 PM | #39 |
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peter de la mare126.00 |
07-31-2020, 03:50 PM | #40 |
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If that is the same shaft as I had, then you’re pushing it right to its max safe rpm I think. It’s possible different tires are giving you slightly lower revs at that speed.
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07-31-2020, 04:02 PM | #41 | |
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I am typically on 295/30/19 I do have one set of 295/25/19 to experiment with, that will get the shaft rotating faster. i will be watching for the vibration you have noticed. |
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peter de la mare126.00 |
08-09-2020, 11:00 AM | #42 |
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I most be missing something because I don’t see how changing the final drive in the diff changes the angular velocity of the driveshaft. The DS connects to the trans output shaft and to the diff input shaft. The DS speed depends on engine rpm and trans gearing whereas the diff output drive axle angular velocity is affected by engine rpm, diff FD (2nd single-gear trans) and trans gearing. Diff FD does not change the input shaft speed to the diff. That only happens during a money shift.
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08-09-2020, 11:48 AM | #43 | |
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On a 3.62 diff, it is easier to get the DS to rotate at speed that gets vibration. |
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08-09-2020, 12:56 PM | #44 |
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Close. The DCT’s original 3.154 FD, changing this to 3.62 makes the shaft spin faster. You’re spinning the engine faster for the same speed. It’s handy for demonstration purposes that 7th gear is 1:1, at some tracks the engine revs in 7th are way over the 6,400 rpm limit of the J-Fiber shaft.
Last edited by peter de la mare; 08-09-2020 at 01:03 PM.. |
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