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07-05-2016, 06:31 PM | #1 |
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Recommended clutch replacement for high power
Can anyone recommend a clutch upgrade (pressure plate and disk) to be mounted on an aluminum flywheel? Looking for an upgrade, but something that can hold at least 500-600 ft.lb torque. This will be used on a modified N52B30 3.0 and 6-speed Manual S6-37 Trans.
I see quite a few out there, but looking for folks who've had some experience to back up their recommendation. Thanks!
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07-05-2016, 07:04 PM | #2 | |
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Quote:
I wanna know more about the 500-600 torques from an N52
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07-05-2016, 07:36 PM | #3 |
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Will divulge the secret details soon
I've found SPEC SB663H 2+ with 545 ft.lbs. May jump on that one unless anyone has a negative comment.
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07-05-2016, 10:43 PM | #4 |
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For what it's worth the UUC upgrade I did was extremely fun and precise. I really enjoyed the feel, for the 15 miles the motor lasted.
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07-06-2016, 01:15 AM | #5 |
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The stock clutch will hold 600NM+ (don't know what that is in ft.lb) with a Sachs 765 pressure plate, if you wanna keep the stock clutch feel. Otherwise I would go with a sinter clutch and a Sachs 618 or a 765 pressure plate if you want more margin for slippage.
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07-06-2016, 01:09 PM | #6 | |
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I say this because you're probably unaware that the z4 has a smaller clutch than an e46 330i or e92 330i with the same m54/n52 engine/gearbox. The z4 has a 228mm clutch plate which has a considerable smaller friction area than the usual 240mm. This is the difference in width of the friction area: quite the difference. (the bigger one is an SRE clutch) So first things is to ditch the 228mm clutch and get a 240mm. I dont know if those 618/765 are still sold. they now have new sets (also complete sets, with 22 spline plates). I think the previous plates were all 9 spline which obviously wont fit. The stock setup will hold 465Nm (as I found out, TS2+), but when driving spiritly and applying throttle a bit fast after the shift there is obviously more chance that you will apply too much power and the clutch wont have the strenght to clamp on (thus it keeps spinning and you burn it if you're not quick enough, a CDV at this torque level on stock clutch is definately not wise). At 600-800Nm it obvously will fail
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Last edited by GuidoK; 07-06-2016 at 01:53 PM.. |
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07-06-2016, 05:11 PM | #7 | |
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Quote:
If the stock clutch and pressure plate will hold 465 Nm I think it's reasonable that the stock clutch will hold at least 500 Nm with a stronger pressure plate. |
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07-06-2016, 07:17 PM | #8 |
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Yes but sachs now has a new line of clutches. I think they used the 618/765 in the past with a stock pressure plate because sachs didnt make fitting performance clutch plates for those pressure plates (maybe different splined centers). I also wonder if 618 and 765 were originally designed for bmw.
Now they have fitting kits (seperate clutch and pressureplate is also available) in organic and sintered with 22 spline (so for 6 speed boxes) especially for bmw. So with the right thickness and right pin setting. The organic kit goes to 540+Nm (that is what I use) and the sintered kit goes to 780+Nm which is enough for most applications. But I think the bigger problem here is that the TS may need a sprung clutch, so both stock and SRE clutches are not suitable. UUC twin disk is interesting, but he already seems to have an aluminium flywheel?!? Self made? Way too little info to give good advice on something as complicated as a performance clutch.
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07-06-2016, 07:24 PM | #9 |
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Thanks for the feedback. It will be an off the shelf aluminum flywheel supplied by Collins, thus the clutch itself will be very basic sprung disk and pressure plate. I'm eyeing the SPEC Stage 2+ as it is fairly inexpensive all things considered, and they claim good torque. Sachs would be a good candidate as well.
This will be on a 3.0si 6 speed (GS6-37BZ trans, not the 420G).
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07-06-2016, 07:45 PM | #10 |
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SPEC Stage 2+ is sprung and is rated at 545.
Wether thats lbs-ft or Nm they dont say....I dont know what to make of a manufacturer that doesnt give that info. My guess is that its lbs-ft as it's an us brand and I can only imagine a US manufacturer be that unaware that there are more than 1 measuring unit and thus not saying what. I cant imagine a german manufacturer (like sachs) to be that sloppy and unprecise in the engineering department. You go to jail for that in Germany But it's worth checking with the manufacturer what the actual spec is (not with some webshop, they dont know shit and just assume everything). It's very affordable for a sprung aftermarket performance kit and they have a huge range (so even if it's Nm you can get a stronger one, they have so many)
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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07-06-2016, 11:01 PM | #11 |
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Sound advice, I will confirm before purchasing. Thanks.
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