? on Semi-WOT on 6MT 335i ... has this happened to you?

Bunkei · 01-30-2012, 08:55 PM

I noticed something a few weeks ago that I'm able to reproduce on a consistent basis. I've never done WOT on the car since there's nowhere to do it, but I do a semi-WOT sometimes on a long hill (that I can see everything). This is the scenario:

I start out in 1st with light throttle (because I'm making a turn on to the hill); I shift to 2nd, and if the throttle is more than 1/2 open, the revs will jump up (to 5-6K RPM) but there's no real acceleration happening. Is this just the nature of turbo lag or something more serious? In fact, I get almost no power unless I let the revs dropped down around 2K RPM or so, then I feel the acceleration kicking in.

Thanks to you gearheads in advance!!

SeanShepard · 01-30-2012, 09:13 PM

Are you revving to 5k rpm while holding the clutch down? :P JK but no that's not a normal that I know of.

Bunkei · 01-30-2012, 09:18 PM

Quote:

Originally Posted by SeanShepard

Are you revving to 5k rpm while holding the clutch down? :P JK but no that's not a normal that I know of.

lol no... I'm mechanically ignorant, but based on what I googled so far, it seems that the clutch may be slipping.

Gearheads out there ... agree/disagree?

idrift4wd · 01-30-2012, 09:47 PM

yuppp Slipping Clutch.

usually happens when you try to put some power down.

like this?(not my video)

atown88 · 01-30-2012, 09:49 PM

Quote:

Originally Posted by Bunkei

lol no... I'm mechanically ignorant, but based on what I googled so far, it seems that the clutch may be slipping.

Gearheads out there ... agree/disagree?

I was also going to suggest a slipping clutch, especially since you're doing this on a hill. Which hill btw?

Bunkei · 01-30-2012, 09:55 PM

Quote:

Originally Posted by atown88

I was also going to suggest a slipping clutch, especially since you're doing this on a hill. Which hill btw?

35th & Alaska in West Seattle.

VTECaddict · 01-30-2012, 09:56 PM

sounds like you need a new clutch

Bunkei · 01-30-2012, 09:56 PM

Quote:

Originally Posted by idrift4wd

yuppp Slipping Clutch.

usually happens when you try to put some power down.

like this?(not my video)

Yes, except it happens in 2nd gear .. DAG NABBIT .. there goes my reserve fund. Is this something that can be done by a reputable Indy shop or does it need to be done by BMW (because they're the only ones that can get the parts). Excuse my ignorance :/

RnmEvo9 · 01-30-2012, 10:05 PM

An indy shop could do it, just be sure they are reputable.

N54B30A · 01-30-2012, 10:17 PM

slipping clutch

turk23 · 01-30-2012, 10:34 PM

Yup def need a new clutch for sure! Stop trying to do peel outs and hard launches! Jk idk if that's what u did, but I know my dumbass did and had to pay the hardway resulting in the need of a new clutch

Bunkei · 01-30-2012, 10:41 PM

Quote:

Originally Posted by turk23

Yup def need a new clutch for sure! Stop trying to do peel outs and hard launches! Jk idk if that's what u did, but I know my dumbass did and had to pay the hardway resulting in the need of a new clutch

lol ... I bought the car used 2 months ago, but until today I had no idea how to test to see clutch slippage during the initial drive. I glad you guys are here, I had even worse diagnosis in mind (failed turbos). Hard lesson learned, but I'm all the better for it.

GMonkey · 02-01-2012, 02:19 PM

ok to do a quick test if the clutch is slipping.

do not break any of your local driving laws when attempting to do this

Get car to normal operating temp (turbo only)
temporally turn off traction control
find a nice straight level road that has clear visibility (no other cars nearby) a dry road helps but not required. (use common sense)
drive lightly till car is idling (850 - 950rpm) in third gear and then
shift to 5th gear and let it fully engage
WOT the accelerator the car and engine speed should move about the same rate.
-- If you hear/see the rpms climb and the car speed does not closely match RELEASE THROTTLE, and have clutch serviced.
it may aslo skip (feel like the car is surging) if it is at the verge of being worn out still get clutch serviced.

turn on traction control

I know this works cause it can be done in a miata (non turbo) and it requires no skill, just common sence.

01-30-2012, 08:55 PM	#1
Bunkei Anti-Fanboy 68 Rep 572 Posts Drives: 2018 BMW M4 Join Date: Apr 2008 Location: Seattle, WA iTrader: (0)	? on Semi-WOT on 6MT 335i ... has this happened to you? I noticed something a few weeks ago that I'm able to reproduce on a consistent basis. I've never done WOT on the car since there's nowhere to do it, but I do a semi-WOT sometimes on a long hill (that I can see everything). This is the scenario: I start out in 1st with light throttle (because I'm making a turn on to the hill); I shift to 2nd, and if the throttle is more than 1/2 open, the revs will jump up (to 5-6K RPM) but there's no real acceleration happening. Is this just the nature of turbo lag or something more serious? In fact, I get almost no power unless I let the revs dropped down around 2K RPM or so, then I feel the acceleration kicking in. Thanks to you gearheads in advance!!
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01-30-2012, 09:13 PM	#2
SeanShepard New Member 0 Rep 22 Posts Drives: searching Join Date: Jan 2012 Location: United States iTrader: (0)	Are you revving to 5k rpm while holding the clutch down? :P JK but no that's not a normal that I know of.
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01-30-2012, 09:47 PM	#4
idrift4wd Brigadier General 149 Rep 3,552 Posts Drives: Three Hundred and Thirty Five Join Date: Jul 2010 Location: Yonkers NY iTrader: (0) Garage List 2007 BMW [7.00]	yuppp Slipping Clutch. usually happens when you try to put some power down. like this?(not my video)
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01-30-2012, 09:56 PM	#7
VTECaddict Where'd my VTEC go? 481 Rep 6,067 Posts Drives: 06 330i 6MT Join Date: Mar 2009 Location: Seattle, WA iTrader: (4)	sounds like you need a new clutch __________________ AW/Terra \| ZSP \| ZPP \| ZCW \| iDrive \| CA Mods: BC BR coilovers \| Blacklines \| M-tech rear \| dual exhaust \| M3 steering wheel \| BMW SSK \| ZHP shift knob \| High-kick CF spoiler \| NBT Retrofit M3 front control arms \| M3 rear guide rods \| Manzo rear toe and camber links \| Monroe rear shock mounts \| Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear
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01-30-2012, 10:05 PM	#9
RnmEvo9 Banned 247 Rep 1,827 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Pembroke Pines, FL iTrader: (2)	An indy shop could do it, just be sure they are reputable.
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01-30-2012, 10:17 PM	#10
N54B30A Captain 224 Rep 699 Posts Drives: 2021 HS M2C Join Date: Jul 2010 Location: Bay Area, California iTrader: (0)	slipping clutch __________________ 2021 M2C HS DCT 2007 Wedge 335i E92 FBO, Stage 2 LPFP,VTT STG 2+, VTT Shotgun E50 w/ Inlets MT-SOLD
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01-30-2012, 10:34 PM	#11
turk23 Captain 22 Rep 813 Posts Drives: 09 335i SD M-Sport Join Date: Jan 2010 Location: Long Island, NY iTrader: (0)	Yup def need a new clutch for sure! Stop trying to do peel outs and hard launches! Jk idk if that's what u did, but I know my dumbass did and had to pay the hardway resulting in the need of a new clutch
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02-01-2012, 02:19 PM	#13
GMonkey New Member 0 Rep 5 Posts Drives: 03' regal Join Date: Jan 2012 Location: Canton, MI iTrader: (0)	ok to do a quick test if the clutch is slipping. do not break any of your local driving laws when attempting to do this Get car to normal operating temp (turbo only) temporally turn off traction control find a nice straight level road that has clear visibility (no other cars nearby) a dry road helps but not required. (use common sense) drive lightly till car is idling (850 - 950rpm) in third gear and then shift to 5th gear and let it fully engage WOT the accelerator the car and engine speed should move about the same rate. -- If you hear/see the rpms climb and the car speed does not closely match RELEASE THROTTLE, and have clutch serviced. it may aslo skip (feel like the car is surging) if it is at the verge of being worn out still get clutch serviced. turn on traction control I know this works cause it can be done in a miata (non turbo) and it requires no skill, just common sence.
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