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Max HP/TQ for a Step 6mt
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11-16-2009, 09:23 PM | #1 |
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Max HP/TQ for a Step 6mt
What would you all estimate the max power you can generate without toasting an auto 335? Anyone making 400 HP or better having transmission problems?
Thanks, John |
11-16-2009, 09:44 PM | #2 |
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I am pretty sure they can handle 400 without issue. If you look at Terry from BMS his cars are making over 400hp at the wheels and have been doing so for awhile now and are daily drivers with no issues that I know of.
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11-17-2009, 10:09 AM | #7 |
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ah....looks like the OP wanted to confuse us all.
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11-17-2009, 10:16 AM | #9 |
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11-17-2009, 10:18 AM | #10 |
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It adds 50WHP or so on pump gas. (91 octane I believe)
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11-17-2009, 10:19 AM | #11 | |
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By the way, doesnt a transmission only care about torque? Thread with graphs: http://www.e90post.com/forums/showth...&highlight=ASR
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11-17-2009, 10:26 AM | #12 |
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Transmissions are rated by torque not horsepower. And even the 400WHP N54's are only making about 300ft-lbs @ 6500RPM, and much less even @ 7000RPM.
Altho it still sucks that our 6AT is rated at 333 ft-lbs (ZF-6HP21), and a freaking V6 Hyundai Genesis Coupe is rated at 433 ft-lbs (ZF-6HP26)
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11-17-2009, 10:52 AM | #13 | |
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11-17-2009, 11:04 AM | #14 | |
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Then I don't understand why they would give us a transmission that is rated for 333ft-lbs when The BMW Performance Pack 335i is rated at exactly 333ft-lbs, and is obviously underrated.
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11-17-2009, 11:12 AM | #15 |
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413 lb-ft ist the limit for the clutch, 460lb-ft for the manual transmission, 480 lb-ft for the driveshafts.
Clutch will start to slip, transmission will get cracked, driveshafts will getting drilled. |
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11-18-2009, 05:15 AM | #16 |
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There is a significant difference in what a tranny is rated for and what it will withstand. I suspect there is probably a 20% overhead in the rating, so I don't think the tranny is the biggest concern we have on this car.
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11-18-2009, 06:42 AM | #17 | |
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Alpina_B3_Lux
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11-18-2009, 07:25 AM | #18 | |
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--- The Dinan M5/6 package creates 468 ft/lb of torque and 611 horsepower --- The M5/6 also weighs about 500 lbs more than the 335i and 900 than the 135i If you believe for one second that 460 ft/lb of torque is the maximum the 6MT (ZF Type G) will hold on the 135i/335i then you are crazy. The 6MT tranny is the last thing you need to worry about in my opinion. |
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11-18-2009, 08:25 AM | #19 |
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Getrag is known for building robust manual transmissions. I wouldnt worry about that either.
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11-18-2009, 09:38 AM | #21 |
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does the AT have some kind of torque limiter or it will just handle whats given to it? Think i have read that different gears have different limits...
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11-18-2009, 12:21 PM | #22 |
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Sorry for the original post's title. But I really am concerned about the Auto-Step. I am not just concerned with brief 1/4 miles or even back to back 1/4 miles. I am wondering about taking a highly modded AT car to the track, and running hard for 20-30mins. Would I need to turn down the power/torque to survive the whole day?
Should I just start over with a 6mt; look into transmission coolers; or what? John |
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