Pulling away from a stop, first 1/4 of throttle movement not linear.

335e92tx · 06-10-2008, 09:49 AM

So, when you press down the accelerator, why does it take about .2-.4 second for the car to respond (then it jumps not smoothly)? Is this 'fixed' with progman 29.2? (ugh).

I have gotten to where I move the accelerator well before the light turns green to account for the delay, then after the car moves, press it down the remainder for a smooth start.. but someone else driving the car wont know of this idiosyncrasy.

I imagine some will just write this off to electronic throttle actuation, but my Gs4 had the same and they got it right 9years before...!!

oncyte · 06-10-2008, 12:32 PM

I think it has to do with the stupid hill assist where it doesn't disengage the brakes for a couple seconds after releasing.

Maybe someone else can chime in. Hopefully there's a fix for this.

mrwma237 · 06-10-2008, 12:46 PM

Do a

on 29.2

There are a few threads in the N54-Turbo-Drivetrain forum about this.

Enjoy.

RedGT3 · 06-10-2008, 12:48 PM

Progman 29.2 wont fix the sticky brake problem. My dealer flashed my car (29.2)and I think the problem is worst. Do a search about sticky brake.

Tag · 06-10-2008, 12:53 PM

Quote:

Originally Posted by oncyte

I think it has to do with the stupid hill assist where it doesn't disengage the brakes for a couple seconds after releasing.

+1

This feature is worthless and I can't believe there's no fix for it or any way to turn it off. It's a PIA when the freaking brake abruptly clamps down or abruptly disengages when you lift your foot off it. Nicely job BMW! I cannot parallel park my car or park close to a wall without smashing my bumper/s and looking like an asshole as I jerk my car into position. Well done!

335e92tx · 06-10-2008, 12:53 PM

I sorta can feel when its the hill assist, theres a little clunk and then the car moves - with no gas on. This is about .2second after that and seems to be linked to the throttle more than anything.

And my car does NOT have 29.2

PaulBailey@ltbmw · 06-10-2008, 01:20 PM

No, i know what 335e92tx is talking about.
The feeling isn't hill assist, it isn't the rear brakes taking too long to let go. I have that problem on my 330i 6MT
What he is experiencing is the same thing i am with my 07 328i.
I'm not a auto mech. so i don't know what the problem is but i know it is the eqivalent to when an older car with a carborator's idle is too low. . . Like there is too much slack in the line and when you step on the accel. there is really bad lag and then you have to step a little harder and then the car jumps and jerks you back into your seat.

Very irritating.

GreenThree · 06-10-2008, 02:07 PM

Quote:

Originally Posted by 335e92tx

So, when you press down the accelerator, why does it take about .2-.4 second for the car to respond (then it jumps not smoothly)? Is this 'fixed' with progman 29.2? (ugh).

I have gotten to where I move the accelerator well before the light turns green to account for the delay, then after the car moves, press it down the remainder for a smooth start.. but someone else driving the car wont know of this idiosyncrasy.

I imagine some will just write this off to electronic throttle actuation, but my Gs4 had the same and they got it right 9years before...!!

I think you have step? For the acceleration hesitation. Hit DS mode. Any hesitation will be non existent. For you or anyone else with the sticky brake deal. I have it too. Just let off the brake slowly. I have done this from a stop and have found that there is no jerky brake deal.

DSXMachina · 06-10-2008, 08:35 PM

Guys, you absolutely should not tolerate this problem! You probably know that you have a 'drive by wire' system in which your throttle is electronically actuated through a device called a stepper motor. You press down X amount on the pedal and the throttle is designed to move Y amount. Unless someone has fiddled with the software the response should be linear, i.e. you press down X+A amount and your throttle response should be Y+A.
If the problem isn't in that system it could be in the injector contol/fuel delivery system. Whichever, a BMW tech who knows his stuff can track down the source of the problem. Your problem will be getting the dealer's service dep't to take you seriously. Be sure the SA goes for a ride with you.
Do NOT accept the "They all do that" BS, they don't.

06-10-2008, 09:49 AM	#1
335e92tx ahat 1036 Rep 2,592 Posts Drives: Was '07-335e92 - Now '13-335IS Join Date: Mar 2008 Location: Texas iTrader: (6)	Pulling away from a stop, first 1/4 of throttle movement not linear. So, when you press down the accelerator, why does it take about .2-.4 second for the car to respond (then it jumps not smoothly)? Is this 'fixed' with progman 29.2? (ugh). I have gotten to where I move the accelerator well before the light turns green to account for the delay, then after the car moves, press it down the remainder for a smooth start.. but someone else driving the car wont know of this idiosyncrasy. I imagine some will just write this off to electronic throttle actuation, but my Gs4 had the same and they got it right 9years before...!! __________________ '13 335IS N54 (1 of 373 LeMans Blue out of 3597 total production e92)- Grey interior (1 of 24 in LMB with any trans- 1 of 14 with DCT)-MODS -MFactory LSD/MHD-BQ custom Tune/ATM-IC/AFE Momentum GT Intake/Konis/Mfront&HeimJoint Rear rods&arms/Brembos. https://photos.app.goo.gl/Lo6aHZRo7XqtPkhL8
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06-10-2008, 12:32 PM	#2
oncyte First Lieutenant 29 Rep 334 Posts Drives: E92 Join Date: Mar 2008 Location: Vancouver iTrader: (3) Garage List 2007 E92 335i [0.00]	I think it has to do with the stupid hill assist where it doesn't disengage the brakes for a couple seconds after releasing. Maybe someone else can chime in. Hopefully there's a fix for this. __________________ E46 Retired....................................Project E92 SB 335i
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06-10-2008, 12:46 PM	#3
mrwma237 Polytech Trooper 44 Rep 190 Posts Drives: 2018 F36 440i Gran Coupe Join Date: Dec 2007 Location: 310/South Bay Beach Cities Los Angeles iTrader: (0)	Do a on 29.2 There are a few threads in the N54-Turbo-Drivetrain forum about this. Enjoy. __________________ Drive w/ Passion Bucket!
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06-10-2008, 12:48 PM	#4
RedGT3 Major 76 Rep 1,253 Posts Drives: .2 GT3/M3cs Join Date: Jun 2007 Location: FL iTrader: (3)	Progman 29.2 wont fix the sticky brake problem. My dealer flashed my car (29.2)and I think the problem is worst. Do a search about sticky brake.
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06-10-2008, 12:53 PM	#6
335e92tx ahat 1036 Rep 2,592 Posts Drives: Was '07-335e92 - Now '13-335IS Join Date: Mar 2008 Location: Texas iTrader: (6)	I sorta can feel when its the hill assist, theres a little clunk and then the car moves - with no gas on. This is about .2second after that and seems to be linked to the throttle more than anything. And my car does NOT have 29.2 __________________ '13 335IS N54 (1 of 373 LeMans Blue out of 3597 total production e92)- Grey interior (1 of 24 in LMB with any trans- 1 of 14 with DCT)-MODS -MFactory LSD/MHD-BQ custom Tune/ATM-IC/AFE Momentum GT Intake/Konis/Mfront&HeimJoint Rear rods&arms/Brembos. https://photos.app.goo.gl/Lo6aHZRo7XqtPkhL8
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06-10-2008, 01:20 PM	#7
PaulBailey@ltbmw General 663 Rep 26,878 Posts Drives: 2-325 330 2-335 2-Z4 2-135 X5d Join Date: Mar 2007 Location: Huntington Beach, CA iTrader: (34) Garage List 2008 BMW 335i E90 [7.00] 2011 BMW 335i E92 [7.96]	No, i know what 335e92tx is talking about. The feeling isn't hill assist, it isn't the rear brakes taking too long to let go. I have that problem on my 330i 6MT What he is experiencing is the same thing i am with my 07 328i. I'm not a auto mech. so i don't know what the problem is but i know it is the eqivalent to when an older car with a carborator's idle is too low. . . Like there is too much slack in the line and when you step on the accel. there is really bad lag and then you have to step a little harder and then the car jumps and jerks you back into your seat. Very irritating.
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06-10-2008, 08:35 PM	#9
DSXMachina If I don't get reincarnated I'm screwed. 1 Rep 196 Posts Drives: E92, 6MT, TiAg, Walnut, Saddle Join Date: Dec 2007 Location: New Hampsha iTrader: (0)	Guys, you absolutely should not tolerate this problem! You probably know that you have a 'drive by wire' system in which your throttle is electronically actuated through a device called a stepper motor. You press down X amount on the pedal and the throttle is designed to move Y amount. Unless someone has fiddled with the software the response should be linear, i.e. you press down X+A amount and your throttle response should be Y+A. If the problem isn't in that system it could be in the injector contol/fuel delivery system. Whichever, a BMW tech who knows his stuff can track down the source of the problem. Your problem will be getting the dealer's service dep't to take you seriously. Be sure the SA goes for a ride with you. Do NOT accept the "They all do that" BS, they don't.
	Appreciate 0 Quote