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09-04-2007, 10:07 PM | #1 |
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Clutch
I have seen tons of talk about additional power but I have yet to hear anyone mention anything about the clutch. Will this be this car's weak spot? Who will be upgrading their clutch and flywheel? A lightweight flywheel would sure make those revs climb faster and build boost quicker. Any thoughts?
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09-05-2007, 10:13 PM | #2 | |
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09-05-2007, 10:20 PM | #3 |
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Problem is, a light clutch has less rotational momentum meaning the engine might dip out of the turbo sweet spot quicker meaning more spin up to get back in the sweet spot and potentially slower times...
I wouldn't mess with the clutch on this car without real evidence that it would produce the result you want - it could really backfire! |
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09-06-2007, 07:12 AM | #4 |
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I'll echo kurichan's comments on the clutch with the caveat that 100% of torque is availalble at 1300 RPM (that's 'diesel like' and a testament to the efficacy of the direct injection).
I also suspect the the factory diff is going to be the weak link in this process - reading the press release they talk about how they are making do with a super duper ball bearing double helical diff and less fluid. We don't even know if the diff has drain and fill plugs. |
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09-06-2007, 11:40 AM | #6 | |
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But speaking of launching the car, some of the 335i owners can probably tell us what an appropriate launch RPM is. |
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09-07-2007, 12:04 AM | #7 |
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If you can only do 4k launches on these then thats weak. I bet it w/handle around 5k w/no problem. Regardless, the first thing I'm buying is a Quaife.
:roundel:
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09-24-2007, 11:40 AM | #9 |
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also, i've been hearing somethings about the tranny not being able to take more than 350whp. If that's the case, beefing up the clutch will only light the fuse for tranny failure, since the power has to go somewhere, i'd rather replace the clutch than tranny.
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09-24-2007, 01:36 PM | #10 | |
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09-24-2007, 02:22 PM | #11 | |
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When brake torquing, I only brake torque at 1900 because brake torquing to 2500 = spin and slower 60' times. In the MT, they are feathering the clutch at about 2300 rpm. There was a thread where a guy coming form an evo drop his clutch at 6k and the trasmission had to be replaced, he coudn't even drive it away. Even stock the n54 develops 250wtq @2500 rpm. |
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09-24-2007, 09:05 PM | #12 |
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if 100% of the torque is at the wheels really early in the rpm range, why would it matter how high your rpm launch is? this is probably a noob question but just curious.
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09-24-2007, 10:54 PM | #14 | ||
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09-25-2007, 08:09 PM | #15 | |
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09-26-2007, 01:15 AM | #16 |
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Wel, the lighter the flywheel, and with greater pressure conjured by the pressure plate and release bearing, it will definitley give the car extra boost...
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09-26-2007, 01:45 AM | #17 |
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I don't think so. The lighter FW will reduce drivetrain losses and the motor will rev faster but it won't give you more boost. Likewise the FW will not increase the pressure plates clamping force.
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09-26-2007, 02:29 AM | #18 |
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I'm pretty sure launching at 400+ wtq will break the N54 tranny. And I have read 335is that got blown gear on other forums. and my question about the low end torque maybe a lil ambiguous. I'm asking if you can get all the Torque at 2000 rpm ... so what's the difference from launching at low rpm compared to high if you get all the torque to the wheels at low already. In other words, how does launching at low rpms protect your tranny?
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09-26-2007, 02:43 AM | #19 | |||
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