Nasty grinding noise power shifting into 2nd

markymarc1979 · 06-25-2009, 10:04 AM

So this has happened to me a few times already and it's really annoying. Basically when I'am redlining first and power shifting into 2nd, sometimes I get this nasty grinding noise and it's probably the synchros rejecting the shift? What causes this and how can it be avoided. I like to power shift.

ACZakka325i · 06-25-2009, 10:08 AM

Let up off the gas man. I don't know one good driver that promotes this type of shifting. Glaze your clutch, and that'll be it for your car.

Gearhead999s · 06-25-2009, 10:13 AM

Quote:

Originally Posted by markymarc1979

So this has happened to me a few times already and it's really annoying. Basically when I'am redlining first and power shifting into 2nd, sometimes I get this nasty grinding noise and it's probably the synchros rejecting the shift? What causes this and how can it be avoided. I like to power shift.

Buy another car and you be OK

markymarc1979 · 06-25-2009, 10:15 AM

So no more power shifting at redline? I thought M cars were built for the track?

Cisco-M3 · 06-25-2009, 10:21 AM

Clutch??

markymarc1979 · 06-25-2009, 10:25 AM

Actually the same thing used to happen to me with my 335, but usually in the morning when I first started driving the car normally. Not redlining. I wonder if this is a common problem with all BMW 6MT?

Gearhead999s · 06-25-2009, 10:29 AM

Quote:

Originally Posted by markymarc1979

So no more power shifting at redline? I thought M cars were built for the track?

Only rockapes power shift!If you wanted to do full throttle upshifts you should have got a M-DCT.

markymarc1979 · 06-25-2009, 10:46 AM

Quote:

Originally Posted by Gearhead999s

Only rockapes power shift!If you wanted to do full throttle upshifts you should have got a M-DCT.

Whats a rockape? Are you insulting me?

ACZakka325i · 06-25-2009, 10:52 AM

Quote:

Originally Posted by markymarc1979

Whats a rockape? Are you insulting me?

See: Caveman. Yes he is insulting you.

Gearhead999s · 06-25-2009, 11:25 AM

Quote:

Originally Posted by markymarc1979

Whats a rockape? Are you insulting me?

Just commenting on your total lack of mechanical sympathy for a very well engineered product.

markymarc1979 · 06-25-2009, 11:35 AM

Quote:

Originally Posted by Gearhead999s

Just commenting on your total lack of mechanical sympathy for a very well engineered product.

We'll keep your comments to yourself. I got your point. Don't powershift at redline. It's a pretty simple concept to grasp. Sometimes you get excited, it's just human nature.

jojogoya88 · 06-25-2009, 11:36 AM

I do have to agree. Should of left out the "power shifting" when you first posted. I know a couple of people who had to replace their clutch b/c of power shifting, NOT a smart idea pal.

!Xoible · 06-25-2009, 11:39 AM

"powershifting is hella fun"

- Rockape.com

elp_jc · 06-25-2009, 12:21 PM

Quote:

Originally Posted by markymarc1979

I wonder if this is a common problem with all BMW 6MT?

If my car is any indication, yes. The 1-2 gear change is quite notchy until tranny gets to full operating temperature, so I wouldn't attempt any 'aggressive' 1-2 shifts until then. I'm still in break-in (1,600 miles), so I hope it gets better, but that's the way it is now. By the way, the fluid change at 1,200 made no difference. Take care.

markymarc1979 · 06-25-2009, 12:23 PM

Quote:

Originally Posted by elp_jc

If my car is any indication, yes. The 1-2 gear change is quite notchy until tranny gets to full operating temperature, so I wouldn't attempt any 'aggressive' 1-2 shifts until then. I'm still in break-in (1,600 miles), so I hope it gets better, but that's the way it is now. By the way, the fluid change at 1,200 made no difference. Take care.

Yea the same thing used to happen to me in my 335, while performing regular shifts from 1st to 2nd. I didn't know a 6mt needs to warm up?

ALM3 · 06-25-2009, 03:49 PM

You didn't realize a 6MT needs to warm up? What do you think is inside the transmission case if it is not some form of oil? All oils have slightly different viscosities and are designed to to provide the optimum performance/protection when at the engineered operating temperature. I sure hope you don't abuse your engine by not allowing it to warm up to the operating temperature before red-lining it. Some of your statements sound like you could be characterized as abusing your M3. Note the warranty does not cover abuse.

Z4dave · 06-25-2009, 04:39 PM

Glad I got a DCT

mvagusta · 06-25-2009, 08:48 PM

Listen no need for trash talk. Same thing happens to a lot of aggresive drivers. To power shift just make sure you hit the clutch to the floor then shift fast. I tried it like this and it was perfect plus there is other drivers that said the same. It's a little tricky but it can be done. The m3 is made for the 2nd gear to be fully engaged for it to be powershifted into 2nd just before redline.

sard · 06-25-2009, 11:30 PM

Yeah..I dunno why you guys are flaming him. Markymarc, this is a known characteristic of many m3 6mt's. Although some ppl claim they don't have it. There are manual cars out there that I've raced that you can easily powershift, everytime, without grinding.

Eugene-TAIWAN · 06-26-2009, 12:55 AM

Quote:

Originally Posted by markymarc1979

So this has happened to me a few times already and it's really annoying. Basically when I'am redlining first and power shifting into 2nd, sometimes I get this nasty grinding noise and it's probably the synchros rejecting the shift? What causes this and how can it be avoided. I like to power shift.

No Grinding sounds at all!!!!

only a bit notchy into 2nd gear. Is this what you mean?

markymarc1979 · 06-26-2009, 03:21 PM

Thanks for the feedback. Some forum members obviously have a lot more class then others. BMW markets this car as performance oriented and bred for the race track. Even in their owners manual they discuss tracking the car. This transmission should be able to handle whatever I give it.

Why did I spend $100K+ on a sports car and I'm not able to drive it in an aggressive fashion. If I want to abuse my car, then I will do so. My original post was inquiring on how to prevent the grinding that comes from powershifting. For those of you that track your car, you know that every millisecond counts. A powershift into 2nd or 3rd can be the difference between achieving a good time and achieving a great time.

markymarc1979 · 06-26-2009, 03:24 PM

Quote:

Originally Posted by Eugene-TAIWAN

No Grinding sounds at all!!!!

only a bit notchy into 2nd gear. Is this what you mean?

No I'm talking about a full out grind and the gear box completely rejects the shift. The clutch is fully opened.

06-25-2009, 10:04 AM	#1
markymarc1979 Lieutenant Colonel Drives: 10 P TURBO + 12 750 + 09 E93 Join Date: Feb 2008 Location: Oakville, Ontario Posts: 1,802 iTrader: (2)	Nasty grinding noise power shifting into 2nd So this has happened to me a few times already and it's really annoying. Basically when I'am redlining first and power shifting into 2nd, sometimes I get this nasty grinding noise and it's probably the synchros rejecting the shift? What causes this and how can it be avoided. I like to power shift.
	Tweet

06-25-2009, 10:08 AM	#2
ACZakka325i Lieutenant Colonel Drives: X1 3.5 M-Sport Join Date: Jul 2005 Location: CT Posts: 1,755 iTrader: (2)	Let up off the gas man. I don't know one good driver that promotes this type of shifting. Glaze your clutch, and that'll be it for your car. __________________ 2013 535i xdrive(Current) 2008 E92 M3 (Gone) 2006 E90 325i (Gone) 2002 E46 325xi (Gone) 1991 E30 325i (Gone)

06-25-2009, 11:36 AM	#12
jojogoya88 Second Lieutenant Drives: 2008 E90 M3 IB Join Date: Dec 2008 Location: LI, Ny Posts: 262 iTrader: (1)	I do have to agree. Should of left out the "power shifting" when you first posted. I know a couple of people who had to replace their clutch b/c of power shifting, NOT a smart idea pal. __________________ 2008 E90 M3 - Interlagos Blue (stock for now)

06-25-2009, 03:49 PM	#16
ALM3 Private First Class Drives: 2008 M3 Join Date: Jul 2008 Location: Toronto Posts: 159 iTrader: (0)	You didn't realize a 6MT needs to warm up? What do you think is inside the transmission case if it is not some form of oil? All oils have slightly different viscosities and are designed to to provide the optimum performance/protection when at the engineered operating temperature. I sure hope you don't abuse your engine by not allowing it to warm up to the operating temperature before red-lining it. Some of your statements sound like you could be characterized as abusing your M3. Note the warranty does not cover abuse. __________________

06-25-2009, 11:30 PM	#19
sard Major Drives: 2008 M3 Join Date: Oct 2008 Location: Southern California Posts: 1,304 iTrader: (1)	Yeah..I dunno why you guys are flaming him. Markymarc, this is a known characteristic of many m3 6mt's. Although some ppl claim they don't have it. There are manual cars out there that I've raced that you can easily powershift, everytime, without grinding. __________________ E92 M3 - DCT - 20" BBS LM-R - KW Clubsport - Akrapovic Exhaust - Powerchip Tune - Arkym Aero Kit - HID Halo

06-25-2009, 10:15 AM	#4
markymarc1979 Lieutenant Colonel Drives: 10 P TURBO + 12 750 + 09 E93 Join Date: Feb 2008 Location: Oakville, Ontario Posts: 1,802 iTrader: (2)	So no more power shifting at redline? I thought M cars were built for the track?

06-25-2009, 10:21 AM	#5
Cisco-M3 Enlisted Member Drives: 00 t/a Join Date: May 2009 Location: Colorado Posts: 30 iTrader: (0)	Clutch??

06-25-2009, 10:25 AM	#6
markymarc1979 Lieutenant Colonel Drives: 10 P TURBO + 12 750 + 09 E93 Join Date: Feb 2008 Location: Oakville, Ontario Posts: 1,802 iTrader: (2)	Actually the same thing used to happen to me with my 335, but usually in the morning when I first started driving the car normally. Not redlining. I wonder if this is a common problem with all BMW 6MT?

06-25-2009, 11:39 AM	#13
!Xoible Banned Drives: .... Join Date: Nov 2006 Location: . Posts: 46,045 iTrader: (4) Garage List 2008 M3 [3.50] 2007 335i [4.50] 2008 528i [4.00] 2006 Infiniti - G35 ... [4.00]	"powershifting is hella fun" - Rockape.com

06-25-2009, 04:39 PM	#17
Z4dave First Lieutenant Drives: 2012 STI Join Date: Apr 2008 Location: Castro Valley-NoR-CaL Posts: 388 iTrader: (0)	Glad I got a DCT

06-25-2009, 08:48 PM	#18
mvagusta Lieutenant Drives: 2008 m3 coup Join Date: Jun 2008 Location: michigan Posts: 476 iTrader: (1)	Listen no need for trash talk. Same thing happens to a lot of aggresive drivers. To power shift just make sure you hit the clutch to the floor then shift fast. I tried it like this and it was perfect plus there is other drivers that said the same. It's a little tricky but it can be done. The m3 is made for the 2nd gear to be fully engaged for it to be powershifted into 2nd just before redline.

06-26-2009, 03:21 PM	#21
markymarc1979 Lieutenant Colonel Drives: 10 P TURBO + 12 750 + 09 E93 Join Date: Feb 2008 Location: Oakville, Ontario Posts: 1,802 iTrader: (2)	Thanks for the feedback. Some forum members obviously have a lot more class then others. BMW markets this car as performance oriented and bred for the race track. Even in their owners manual they discuss tracking the car. This transmission should be able to handle whatever I give it. Why did I spend $100K+ on a sports car and I'm not able to drive it in an aggressive fashion. If I want to abuse my car, then I will do so. My original post was inquiring on how to prevent the grinding that comes from powershifting. For those of you that track your car, you know that every millisecond counts. A powershift into 2nd or 3rd can be the difference between achieving a good time and achieving a great time.

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