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11-22-2012, 01:04 AM | #1 |
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How much power can a 135i N55 transmission handle?l
I have been searching for a while now and have come up empty. Does anyone know what the 135i N55 trans càn handle in terms of pôwer? Thañks.
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11-22-2012, 01:21 AM | #2 |
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11-22-2012, 01:23 AM | #3 |
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The DCT can only handle a max of about 410whp and 470wtq. Manual can handle more.
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11-22-2012, 01:44 AM | #5 |
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11-26-2012, 02:09 PM | #6 |
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I agree with those numbers.
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11-26-2012, 02:30 PM | #7 | |
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Info I've read says the DCT is rated at 600Nm whereas the 6MT is only rated at 430Nm. I know of a 135i in the UK where the gearbox gave up after 50k miles behind a remapped N55. It's the reason BMW don't offer the manual trans bolted to the back of the 335d.
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Last edited by GeeRam; 11-26-2012 at 02:36 PM.. |
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11-26-2012, 02:44 PM | #8 | |
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11-26-2012, 02:57 PM | #9 |
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You don't hear many stories of people breaking either transmission, so it would seem the answer is, "more than anyone has bothered to put in their 135i."
A lot of this has to do with drivetrain slop (dual mass flywheel, driveshaft isolator, bushings, etc), tires, and abuse. I wouldn't worry too much until you are running on slicks with a solid flywheel, unsprung clutch, and beating the hell out of it.
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11-26-2012, 04:49 PM | #10 | |
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Not sure about the manual rating, 430Nm seems very close to the base engine spec of 400Nm torque. |
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11-26-2012, 05:27 PM | #11 |
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no way an auto coming out of factory BMW cars handle more power than a 6spd....not happening with today's tech/price ratio.
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11-26-2012, 11:48 PM | #12 |
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how many hp
maybe you should ask the question to a profession mechanical engineer at BMW.
if not possible.....a good shop that built performance transmission. just my opinion |
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11-27-2012, 12:50 AM | #13 | |
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Quote:
Your question asked about power, however, and power at a given torque is a function of RPM, and hence how the motor is built/ tuned. If the motor is built and tuned for high rpm power but limited peak torque, then 450 ft/lbs at 7000 rpm would give you 600 whp and be perfectly safe for the transmission. Of course most N54/ N55 motors are tuned exactly opposite this, with more torque than HP, but this illustrates how high power can be made with limited peak torque. The logical conclusion of this philosophy was shown in F1 V8s before the 18,000 rpm limit, where engines were making well north of 750 hp at almost 20k rpm, but peak torque was only a little more than 200 ft/lbs, allowing tiny and light weight 7 speed gearboxes that weigh well under 100 lbs.
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11-27-2012, 12:54 PM | #14 | |
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11-27-2012, 01:53 PM | #15 |
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i might be wrong but people talking about slippage, this would not be gearbox failure, more clutch. in my experience of gearbox failure it goes bang and you lose some teeth which rattle around and before you know what hit you the box is scrap.
i am well aware it is easy to up-rate a clutch in a manual and not so easy on the dct |
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11-27-2012, 11:43 PM | #16 | |
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hp versus tq
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thanks |
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11-28-2012, 01:02 PM | #17 |
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01-18-2014, 05:39 AM | #18 |
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Reviving a dead thread!!! How about the auto tranny? (Yes I know, having the auto trans sux...) i'm definitely not around 400whp yet by the way...
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01-18-2014, 10:45 AM | #19 |
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01-18-2014, 10:46 AM | #20 | |
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the problem with DCT is the clutches can't really be upgraded easily as they're a lot more complex. soon though. |
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05-30-2018, 04:59 PM | #22 |
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Bringing this thread back alive! Since it has been a handful of years since first created, do we have a better understanding of how much the stock n55 135i tranny can handle to the wheels?
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