Jumpy downshifting?

Straight Dave · 07-19-2011, 10:01 AM

So yesterday I am out in the m3 and decided to take a back road on the way home from work, it was a nice day and the weather was suitable so I decided why not show my car some speed. Granted this was the first time I have done this with the car because it is still pretty new (1580 miles) When i started off by downshifting to 3'nd gear from 4'th gear the car started off smoothly gave me throttle response and everything I thought it would be, but then when i would slow down for a corner and drop down to first gear the car would be very jumpy and erratic. I used to do the same thing on my 09 335i and it was much smoother downshifting then the m3, is this normal???

1MOREMOD · 07-19-2011, 10:07 AM

yes depending on what your doing, it might be normal. the throttle is pretty sensitive particularlly if you are using power or power plus mode. smooth throttle imputs are rewarded. having said that the car will tend to buck a little if cold or if you shift and arent consistent with input. i notice this on 0-60 runs on the 1st to 2nd shift. if i am tenative after the shift it lurches but if i hammer it it keeps giving it back.

Straight Dave · 07-19-2011, 10:11 AM

Yea I also noticed that when I slowed down I faced the problem but when I would give it hell it seemed like it was at home again.

Caweran · 07-19-2011, 10:12 AM

I have no idea if it is normal or not, but my car did the same thing when downshifting in a corner... It hesitated a little and followed by a jumpy downshift... I did notice that it always happens between 2nd and 1st gear only.

1MOREMOD · 07-19-2011, 10:13 AM

i rarely try to take a corner in first gear if that helps? go faster.

Straight Dave · 07-19-2011, 11:59 AM

The moral of the story.... go faster

sameh · 07-19-2011, 12:03 PM

This car performs like an M3 ONLY when it's driven like an M3.

Seattle S65B40 · 07-19-2011, 12:30 PM

Why are you down shifting into first???

radiantm3 · 07-19-2011, 12:50 PM

Another question would be DCT or 6MT? I'm assuming your 335i was an auto.

Straight Dave · 07-19-2011, 02:05 PM

When im coming in at 15 mph I downshift to first so I can take off after the corner. It is DCT and the 335i was an auto.

Caweran · 07-19-2011, 02:13 PM

to turn the corner to a Chicago's Northside small road/alleyway/blind corner... need to slow down.

FVM3 · 07-19-2011, 02:14 PM

that's normal

Straight Dave · 07-19-2011, 02:36 PM

Well that kinda sucks but I assume it is one of those things that m3 owners deal to live with.

e92m3allday · 07-19-2011, 08:24 PM

I never downshift into first unless I am going literally like 2 mph. If I ever slow down for a corner the lowest I'll shift is 2nd gear. A lot smoother.

mdosu · 07-19-2011, 08:46 PM

why downshift to 1st? There should be plenty of power in 3k-2k range in 2nd gear.
What you're doing is like really hard with a 6MT to get perfect.

ersin · 07-19-2011, 08:47 PM

Quote:

Originally Posted by Straight Dave

When im coming in at 15 mph I downshift to first so I can take off after the corner. It is DCT and the 335i was an auto.

With DCT I'd say this is a function of the transmission. With a 6MT you should be able to match revs to get it smooth, but I don't know what the DCT is doing. I'd say as long as you're moving don't go lower than second gear. You should still be in the "power" part of the torque curve coming out of the turn.

Cheers.

Straight Dave · 07-19-2011, 11:05 PM

Well that def helps my dilemma because I tried the same thing on the way home today but kept it in second and it was much less erratic now just gotta figure out how to perfect it

Asiarush · 07-20-2011, 01:30 AM

Thats correct, imo, first gear should only be used from a complete stop.
even if you drive slow, take the corner on a second gear.

Quote:

Originally Posted by Seattle S65B40

Why are you down shifting into first???

07-19-2011, 10:01 AM	#1
Straight Dave Lieutenant 27 Rep 444 Posts Drives: 2011.5 e92 m3 Join Date: Jun 2010 Location: Houston iTrader: (0)	Jumpy downshifting? So yesterday I am out in the m3 and decided to take a back road on the way home from work, it was a nice day and the weather was suitable so I decided why not show my car some speed. Granted this was the first time I have done this with the car because it is still pretty new (1580 miles) When i started off by downshifting to 3'nd gear from 4'th gear the car started off smoothly gave me throttle response and everything I thought it would be, but then when i would slow down for a corner and drop down to first gear the car would be very jumpy and erratic. I used to do the same thing on my 09 335i and it was much smoother downshifting then the m3, is this normal???
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07-19-2011, 10:07 AM	#2
1MOREMOD - 11817 Rep 23,187 Posts Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors iTrader: (5)	yes depending on what your doing, it might be normal. the throttle is pretty sensitive particularlly if you are using power or power plus mode. smooth throttle imputs are rewarded. having said that the car will tend to buck a little if cold or if you shift and arent consistent with input. i notice this on 0-60 runs on the 1st to 2nd shift. if i am tenative after the shift it lurches but if i hammer it it keeps giving it back. __________________ 02 Tiag e46 M3\|6MT\|GC plates\|MCS c.o.\|GC bars\|GC race control arms\|GC bushings\|BW eng. & tran. mounts\|subframe kit\|BW race shifter\|BW Jaffster\|Euro header\|BW exhaust\|K&N c.a.i.\|Epic race tune\|Rouge pulleys\|Seibon CF hood\|CSL bumper\|apr gt 250 & splitter\|ST-40\|XR-2\|SS lines\|half cage\|Recaro profi\|Profi 2 harness\|BMWpedals\|BW studs\|
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07-19-2011, 10:11 AM	#3
Straight Dave Lieutenant 27 Rep 444 Posts Drives: 2011.5 e92 m3 Join Date: Jun 2010 Location: Houston iTrader: (0)	Yea I also noticed that when I slowed down I faced the problem but when I would give it hell it seemed like it was at home again.
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07-19-2011, 10:12 AM	#4
Caweran Enlisted Member 1 Rep 39 Posts Drives: E90 M3 Join Date: Mar 2011 Location: SF iTrader: (0)	I have no idea if it is normal or not, but my car did the same thing when downshifting in a corner... It hesitated a little and followed by a jumpy downshift... I did notice that it always happens between 2nd and 1st gear only.
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07-19-2011, 10:13 AM	#5
1MOREMOD - 11817 Rep 23,187 Posts Drives: Race car-> Join Date: Mar 2009 Location: check your mirrors iTrader: (5)	i rarely try to take a corner in first gear if that helps? go faster. __________________ 02 Tiag e46 M3\|6MT\|GC plates\|MCS c.o.\|GC bars\|GC race control arms\|GC bushings\|BW eng. & tran. mounts\|subframe kit\|BW race shifter\|BW Jaffster\|Euro header\|BW exhaust\|K&N c.a.i.\|Epic race tune\|Rouge pulleys\|Seibon CF hood\|CSL bumper\|apr gt 250 & splitter\|ST-40\|XR-2\|SS lines\|half cage\|Recaro profi\|Profi 2 harness\|BMWpedals\|BW studs\|
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07-19-2011, 11:59 AM	#6
Straight Dave Lieutenant 27 Rep 444 Posts Drives: 2011.5 e92 m3 Join Date: Jun 2010 Location: Houston iTrader: (0)	The moral of the story.... go faster
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07-19-2011, 12:03 PM	#7
sameh Lieutenant Colonel 171 Rep 1,530 Posts Drives: 2015 Porsche 911S Join Date: Aug 2010 Location: Texas iTrader: (0)	This car performs like an M3 ONLY when it's driven like an M3. __________________ 2011 E92 JB/BL/DCT--->80K Miles 2015 F80 SS/SO/DCT?->28K Miles 2015 Porsche 911S
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07-19-2011, 12:30 PM	#8
Seattle S65B40 Major 213 Rep 1,395 Posts Drives: 2008 e92 M3 Join Date: Jan 2011 Location: PNW iTrader: (0) Garage List 2008 BMW M3 [0.00]	Why are you down shifting into first??? __________________ Club 6MT 2008 E92 M3 6MT, AW/Blk Ext., brushed aluminum 2006 E46 M3 ZCP 6MT Carbon blk/blk(sold) 2001 E46 325Xi 5MT Jet Blk/Blk (sold)
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07-19-2011, 12:50 PM	#9
radiantm3 Apex Everything! 976 Rep 4,378 Posts Drives: 2007 Honda S2000, 2017 GT350 Join Date: Sep 2008 Location: Cedar Park, TX iTrader: (6) Garage List 2011 E92 M3 [9.35] 2014 BMW i3 [10.00]	Another question would be DCT or 6MT? I'm assuming your 335i was an auto. __________________ 2011 E92 M3(Sold). 2007 Honda S2000 (Track Car). 2016 Cayman GT4 (Sold). 2017 Shelby GT350 (AKA Crowd Killer). My pet project: https://stickershift.com
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07-19-2011, 02:05 PM	#10
Straight Dave Lieutenant 27 Rep 444 Posts Drives: 2011.5 e92 m3 Join Date: Jun 2010 Location: Houston iTrader: (0)	When im coming in at 15 mph I downshift to first so I can take off after the corner. It is DCT and the 335i was an auto.
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07-19-2011, 02:13 PM	#11
Caweran Enlisted Member 1 Rep 39 Posts Drives: E90 M3 Join Date: Mar 2011 Location: SF iTrader: (0)	to turn the corner to a Chicago's Northside small road/alleyway/blind corner... need to slow down.
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07-19-2011, 02:14 PM	#12
FVM3 Major General 273 Rep 5,751 Posts Drives: e92 m3, f30 328i Join Date: Sep 2010 Location: Los Angeles iTrader: (2)	that's normal
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07-19-2011, 02:36 PM	#13
Straight Dave Lieutenant 27 Rep 444 Posts Drives: 2011.5 e92 m3 Join Date: Jun 2010 Location: Houston iTrader: (0)	Well that kinda sucks but I assume it is one of those things that m3 owners deal to live with.
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07-19-2011, 08:24 PM	#14
e92m3allday Second Lieutenant 70 Rep 236 Posts Drives: 2024 X5 M40i Join Date: May 2010 Location: Wayne NJ iTrader: (1)	I never downshift into first unless I am going literally like 2 mph. If I ever slow down for a corner the lowest I'll shift is 2nd gear. A lot smoother.
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07-19-2011, 08:46 PM	#15
mdosu Banned 314 Rep 8,496 Posts Drives: Double Vanos'd Civic-M3 Join Date: Oct 2009 Location: San Francisco iTrader: (6)	why downshift to 1st? There should be plenty of power in 3k-2k range in 2nd gear. What you're doing is like really hard with a 6MT to get perfect.
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07-19-2011, 11:05 PM	#17
Straight Dave Lieutenant 27 Rep 444 Posts Drives: 2011.5 e92 m3 Join Date: Jun 2010 Location: Houston iTrader: (0)	Well that def helps my dilemma because I tried the same thing on the way home today but kept it in second and it was much less erratic now just gotta figure out how to perfect it
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