Car Jerks and Lose Traction When Shifting at High RPM

Alvin Mpower · 04-06-2023, 02:45 PM

Hi Guys,

I'm noticing this issue with my car when I shift above 6000 RPM the car rear wheel will jerk and traction light flash for couple times. This only happens in manual shift 3rd setting, but it doesn't do it when it shifts itself. is this normal? Why is this happening? I'm on BM3 stage 1 93. I don't think this was happening before I tuned the car, is it because too much torque? But why only in manual mode?

hC1001 · 04-06-2023, 03:11 PM

Quote:

Originally Posted by Alvin Mpower

Hi Guys,

I'm noticing this issue with my car when I shift above 6000 RPM the car rear wheel will jerk and traction light flash for couple times. This only happens in manual shift 3rd setting, but it doesn't do it when it shifts itself. is this normal? Why is this happening? I'm on BM3 stage 1 93. I don't think this was happening before I tuned the car, is it because too much torque? But why only in manual mode?

I have a 6 speed manual, BM3 stage 1 93 oct tune and i get this too or something similar on track. I turn off traction control tho. Car gets upset or floaty during the shift when trying to go for top speed on a long straight. I do think its the torque and the sudden off and on again action... best i can describe it is taking 1st gear to 5000rpm at WOT and then backing off to half throttle and then back to WOT...

Since you have traction control on, maybe thats whats causing your issue. Have you tried turning it off?

It could also be something in the tune as well. Maybe the mapping might make the engine do something that upsets it. I really dunno but wanted to let you know you are not alone.

clutchdj · 04-06-2023, 03:21 PM

try using 1 or 2bars OP.
On track anything above 2 would upset the balance of the car from what I remember.

Humdizzle · 04-06-2023, 03:28 PM

how are your tires and what are the outside temps?

warm weather and ps4s i had zero issues in the 2-3 shift.

Alvin Mpower · 04-06-2023, 05:40 PM

I have everyhing in sport plus and traction in MDM.
when if only sport and shift bar 2 it doesnt do this.
I have DWS06+ all season now but I had PSS before and it did the same.
I will have to try turning traction control off to see if that gets rid of it.

Idfkman · 04-07-2023, 11:57 AM

Sounds like wheel spin from the added power. The manual shifts are seemingly more abrupt which may cause the tires to chirp.

Stickier tires may be the solution. When I bought my car it came with all seasons and they were the first thing I changed.

kyrix1st · 04-07-2023, 06:50 PM

DCT adds forward inertia during a power upshift because the gear changes are so quick, causing the rear tires to momentarily slip. However, this only happens in a straight line because DME controls the ferocity of the shifts depending on the g-sensor inputs so you do not lose traction during cornering. Basically, it's the becauseracecar characteristic.

2016 M3 Comp · 04-07-2023, 10:15 PM

I would recommend opening the config option on the bm3 tune screen and setting torque reduction in 1st and 2nd gear. Personally I set mine to 20% in 1st and 10% in 2nd. Seemed to help keep the back end straight and reduced wheel spin/mdm intervention down.

hellokitty · 04-08-2023, 12:14 AM

Quote:

Originally Posted by Alvin Mpower

I have everyhing in sport plus and traction in MDM.
when if only sport and shift bar 2 it doesnt do this.
I have DWS06+ all season now but I had PSS before and it did the same.
I will have to try turning traction control off to see if that gets rid of it.

Either disable TC completely or code Euro MDM.

Car is cutting power on upshift due to loss of traction.

Wider 200TW tires and warmer weather will help.

dezzracer · 04-08-2023, 01:12 AM

Quote:

Originally Posted by Alvin Mpower

I have everyhing in sport plus and traction in MDM.
when if only sport and shift bar 2 it doesnt do this.
I have DWS06+ all season now but I had PSS before and it did the same.
I will have to try turning traction control off to see if that gets rid of it.

Nothing is wrong with your car. Also, why are you driving around in sport + on the street? The car won’t like it. Sport + settings are tuned for aggressive driving on a race track.

G35POPPEDMYCHERRY · 04-11-2023, 07:44 AM

Quote:

Originally Posted by dezzracer

Nothing is wrong with your car. Also, why are you driving around in sport + on the street? The car won’t like it. Sport + settings are tuned for aggressive driving on a race track.

car feels like a 60s roller coaster in sport plus for DD

kfresh · 04-12-2023, 12:39 PM

Quote:

Originally Posted by dezzracer

Nothing is wrong with your car. Also, why are you driving around in sport + on the street? The car won’t like it. Sport + settings are tuned for aggressive driving on a race track.

I've been driving in Sports+ on the street for years, my car loves it.

04-06-2023, 02:45 PM	#1
Alvin Mpower Lieutenant 405 Rep 464 Posts Drives: 2016 M4 ZCP Join Date: Jun 2020 Location: RI iTrader: (0)	Car Jerks and Lose Traction When Shifting at High RPM Hi Guys, I'm noticing this issue with my car when I shift above 6000 RPM the car rear wheel will jerk and traction light flash for couple times. This only happens in manual shift 3rd setting, but it doesn't do it when it shifts itself. is this normal? Why is this happening? I'm on BM3 stage 1 93. I don't think this was happening before I tuned the car, is it because too much torque? But why only in manual mode? __________________ Current car: 2016 M4 DCT/Competition Pack/Executive Pack/Lighting Pack Previous car: 2017 440i 6MT M-sport/Track Handling/MPPSK/CTS Turbo catted downpipe/BM3 stage 2
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04-06-2023, 03:21 PM	#3
clutchdj Colonel 1909 Rep 2,408 Posts Drives: a few cars Join Date: May 2015 Location: NY iTrader: (6)	try using 1 or 2bars OP. On track anything above 2 would upset the balance of the car from what I remember.
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04-06-2023, 03:28 PM	#4
Humdizzle Brigadier General 6140 Rep 3,662 Posts Drives: GT3 + M2c Join Date: Oct 2016 Location: Missouri iTrader: (0)	how are your tires and what are the outside temps? warm weather and ps4s i had zero issues in the 2-3 shift. __________________ 2018 Porsche GT3 6MT 2021 M2C DCT Previous: Ferrari 458 \| R35 GTR \| F80 M3 \| E46 M3 \| E36 M3 \| Scion FRS
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04-06-2023, 05:40 PM	#5
Alvin Mpower Lieutenant 405 Rep 464 Posts Drives: 2016 M4 ZCP Join Date: Jun 2020 Location: RI iTrader: (0)	I have everyhing in sport plus and traction in MDM. when if only sport and shift bar 2 it doesnt do this. I have DWS06+ all season now but I had PSS before and it did the same. I will have to try turning traction control off to see if that gets rid of it. __________________ Current car: 2016 M4 DCT/Competition Pack/Executive Pack/Lighting Pack Previous car: 2017 440i 6MT M-sport/Track Handling/MPPSK/CTS Turbo catted downpipe/BM3 stage 2
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04-07-2023, 11:57 AM	#6
Idfkman Lieutenant 473 Rep 468 Posts Drives: F80 M3 Join Date: Sep 2018 Location: Maryland iTrader: (1)	Sounds like wheel spin from the added power. The manual shifts are seemingly more abrupt which may cause the tires to chirp. Stickier tires may be the solution. When I bought my car it came with all seasons and they were the first thing I changed. __________________ 10 E90 M3 /// Dinan Intake, X Pipe, Exhaust, Underdrive, 3.62 Diff, Coilovers, Alpine e85 Tune - sold 16 F80 M3 /// MaxPSI 4 Pin, DP, CP, SL Mid-Pipe, TMIC, KW HAS, EU5's, AB Performance Flex Tuned
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04-07-2023, 06:50 PM	#7
kyrix1st Colonel 2380 Rep 2,370 Posts Drives: G87 M2; E92M3 MT&DCT; M3 euro Join Date: Sep 2014 Location: nyc iTrader: (0) Garage List 2004 BMW Z4 [0.00]	DCT adds forward inertia during a power upshift because the gear changes are so quick, causing the rear tires to momentarily slip. However, this only happens in a straight line because DME controls the ferocity of the shifts depending on the g-sensor inputs so you do not lose traction during cornering. Basically, it's the becauseracecar characteristic. __________________ Pass me if you can.
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04-07-2023, 10:15 PM	#8
2016 M3 Comp Registered 2 Rep 3 Posts Drives: F80 Comp, 97' M3, 99' 328is Join Date: Apr 2023 Location: California iTrader: (0)	I would recommend opening the config option on the bm3 tune screen and setting torque reduction in 1st and 2nd gear. Personally I set mine to 20% in 1st and 10% in 2nd. Seemed to help keep the back end straight and reduced wheel spin/mdm intervention down.
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