Delayed acceleration-hesitation in Z4M roadster

mousitch · 02-04-2010, 11:05 AM

Has anyone noticed a delayed reaction from the time you floor your car and to the time it responds at speed? Say I downshift to second and nail it, sometimes there is a small noticible delay before the engine kicks in. Could this be DSC kicking in? Not at a speed where tire spin would be an issue I don't think. I don't notice the DSC light when this happens. Its not noticeable from a dead stop just say when i'm already at speed and nailing the throttle after I downshift.Thought this could be just because of the throttle by wire setup in our cars. Or maybe I have a bad tune on my chip. Just throwing this out there(slow day at work).

Shorestyle031 · 02-04-2010, 03:48 PM

They make a sprint booster that amplifies the signal so it eliminates that delay, but idk if they make it for the z4 m.

Hawkeye · 02-04-2010, 06:51 PM

Only time I have heard of acceleration issues on a Zed M is with the RPI scoop and no tune.

If you are downshifting and nailing the accelerator... you don't think your tires would spin? Are you talking 6th-5th or something? Maybe your foot is on the clutch?

mousitch · 02-04-2010, 08:07 PM

Quote:

Originally Posted by Hawkeye

Only time I have heard of acceleration issues on a Zed M is with the RPI scoop and no tune.

If you are downshifting and nailing the accelerator... you don't think your tires would spin? Are you talking 6th-5th or something? Maybe your foot is on the clutch?

I need to try with dsc off first(weather now sucks). Say I ride the rpm up in second to 4000 hold it for a second or two and nail it, there will be a delay before the car kicks in and hits 7800 for a shift to third. No dsc light, just no throttle response for like a 1/2 second maybe less. I guess it could be just delaying itself to stop any wheelspin.

pbdm4k · 02-05-2010, 03:33 PM

Quote:

Originally Posted by Shorestyle031

They make a sprint booster that amplifies the signal so it eliminates that delay, but idk if they make it for the z4 m.

Biggest scam and piece of garbage ever.

Your money is better spent elsewhere. For example... a mod that actually ADDS horsepower instead of makes you think you have more horsepower.

mousitch · 02-05-2010, 03:42 PM

Quote:

Originally Posted by Shorestyle031

They make a sprint booster that amplifies the signal so it eliminates that delay, but idk if they make it for the z4 m.

I believe that is what the sport button does. And yes it's on when I'm having the delay

Also I have removed the carbon filter. Might put it back and see if that's the problem. Don't see how it could be though.
Called Powerchip and they have claimed not to have heard of his problem but would reflash my DME with an more agressive program for $190. Don't know, already have given them over $800 of my hard earned cash. Not that I wouldnt do it again (I would' though just use ESS's for a change)

thekurgan · 02-05-2010, 07:27 PM

Quote:

Originally Posted by Hawkeye

Only time I have heard of acceleration issues on a Zed M is with the RPI scoop and no tune.

If you are downshifting and nailing the accelerator... you don't think your tires would spin? Are you talking 6th-5th or something? Maybe your foot is on the clutch?

Have never had that issue or that of the OP. The only thing I've heard from removing the charcoal filter is some idle problems, taking it out doesn't give much.

Luminor · 02-06-2010, 08:21 AM

The charcoal filter is very likely not the problem and you can't rule out the PowerChip tune, that very well may have something to do with it, but...

I will say that I had a similar issue with my 2006 Z4MC prior to any mods the car. It turned out to be an issue with the Vanos. That may be something you want to look into as well.

mousitch · 02-06-2010, 09:59 AM

Quote:

Originally Posted by Luminor

The charcoal filter is very likely not the problem and you can't rule out the PowerChip tune, that very well may have something to do with it, but...

I will say that I had a similar issue with my 2006 Z4MC prior to any mods the car. It turned out to be an issue with the Vanos. That may be something you want to look into as well.

Do you know the specifics of your VANOS problem? Were you throwing codes? I'm taking it in to the dealer and want to be armed with something. I'm afraid this is a problem that could get worse and it's so easy for the dealer to discount or replicate as "nothing". Then in two months when warranty is out, the VANOS unit decides to go south. Bad very bad.

thekurgan · 02-06-2010, 10:10 AM

I'd put the charcoal filter back in before your trip to the dealership.

mousitch · 02-06-2010, 10:49 AM

Quote:

Originally Posted by thekurgan

I'd put the charcoal filter back in before your trip to the dealership.

Yes. They would love seeing that.

pal · 02-06-2010, 01:10 PM

Could you be experiencing the lag of the stock CDV that causes clutch engagement at constant rate? If you shift and nail the throttle very fast, the clutch engagement may take a split second longer ...

mousitch · 02-06-2010, 01:52 PM

Quote:

Originally Posted by pal

Could you be experiencing the lag of the stock CDV that causes clutch engagement at constant rate? If you shift and nail the throttle very fast, the clutch engagement may take a split second longer ...

CDV deleted. It could just be the DSC. Gonna go out today and run some tests in a remote area

ga41 · 02-07-2010, 05:26 AM

Keep us updated as i also notice something similar.

mousitch · 02-07-2010, 11:07 AM

Quote:

Originally Posted by ga41

Keep us updated as i also notice something similar.

Had it out last night but could not replicate. I have some good straightaways on the way to the gym and Ill try again. Both with DSC on and off and the sport mode on and off.

Starscream · 02-07-2010, 11:27 AM

Have you tried resetting the throttle adaptation?

Might be worth a try,
I see you have software, I used to have an occasional feeling in my M very intermittent where some days it would feel low on power and unresponsive,
Then the next time I drove it the feeling was back to normal at full power,
I got the ESS tune and never had that since, but before I got the car tuned I did reset the throttle that a board member (epbrown) mentioned and it actually made the car better and more responsive

RussRamz · 02-07-2010, 12:13 PM

Quote:

Originally Posted by thekurgan

I'd put the charcoal filter back in before your trip to the dealership.

I would start my grill with the worthless charcoal filter. Then with the fat chick on the passenger seat!!

My wife wishes I had a charcoal filter in my pants right now. She is not happy with the smell of my ass...

mousitch · 02-07-2010, 12:16 PM

Quote:

Originally Posted by Starscream

Have you tried resetting the throttle adaptation?

Might be worth a try,
I see you have software, I used to have an occasional feeling in my M very intermittent where some days it would feel low on power and unresponsive,
Then the next time I drove it the feeling was back to normal at full power,
I got the ESS tune and never had that since, but before I got the car tuned I did reset the throttle that a board member (epbrown) mentioned and it actually made the car better and more responsive

Ill get the watch out and reset the throttle adaption. Haven't done that in a while. Good advice.

Hawkeye · 02-08-2010, 11:35 AM

Quote:

Originally Posted by thekurgan

Have never had that issue or that of the OP. The only thing I've heard from removing the charcoal filter is some idle problems, taking it out doesn't give much.

Can read about it here http://www.zpost.com/forums/showthre...I+ESS+throttle

02-04-2010, 11:05 AM	#1
mousitch Dark Sider 129 Rep 1,779 Posts Drives: 2008 Space Gray Z4MC Join Date: Jan 2010 Location: Missouri iTrader: (11) Garage List 2008 Z4M Coupe [7.50]	Delayed acceleration-hesitation in Z4M roadster Has anyone noticed a delayed reaction from the time you floor your car and to the time it responds at speed? Say I downshift to second and nail it, sometimes there is a small noticible delay before the engine kicks in. Could this be DSC kicking in? Not at a speed where tire spin would be an issue I don't think. I don't notice the DSC light when this happens. Its not noticeable from a dead stop just say when i'm already at speed and nailing the throttle after I downshift.Thought this could be just because of the throttle by wire setup in our cars. Or maybe I have a bad tune on my chip. Just throwing this out there(slow day at work). __________________ [URL=http://imageshack.us/photo/my-images/153/071jt.jpg/] 2008 Space Grey M Coupe-Euro headers-RPI Scoop-Gruppe M CAI-Eisenmann Race Cans-RE X-pipe-ECU Remap with O2 and EGT delete-H&R Sport springs-Zeck CDV delete-Stock Gloss black powder coated wheels-LED Tekarbon Angel Eyes Project-Michelin Super Sports-Hardwired Uniden R7-H&R front and rear spacers-Alarm module added-stereo amp recoded to vert spec settings Last edited by mousitch; 02-04-2010 at 11:22 AM.. Reason: title
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02-04-2010, 03:48 PM	#2
Shorestyle031 Private First Class 39 Rep 170 Posts Drives: 08 M roadster Join Date: Dec 2009 Location: Point Pleasent, NJ iTrader: (0)	They make a sprint booster that amplifies the signal so it eliminates that delay, but idk if they make it for the z4 m. __________________ 08 M roadster
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02-04-2010, 06:51 PM	#3
Hawkeye Brigadier General 2070 Rep 4,365 Posts Drives: '07 Z4 Coupe, '21 X3, '16 GMC Join Date: Aug 2007 Location: Iowa iTrader: (0) Garage List 2016 GMC Sierra SLT [10.00] 2008 Yamaha R6 [9.00]	Only time I have heard of acceleration issues on a Zed M is with the RPI scoop and no tune. If you are downshifting and nailing the accelerator... you don't think your tires would spin? Are you talking 6th-5th or something? Maybe your foot is on the clutch? __________________ 2007 Z4 3.0si Coupe • 6 MT • Black Saphire Metallic • PP • SP 2016 GMC Sierra SLT Z71 Premium Plus 4x4 2017 Harley StreetGlide • Denim Black • V&H Tune 2021 BMW x30i • Phytonic Blue Metallic • Fully loaded
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02-06-2010, 08:21 AM	#8
Luminor New Member 1 Rep 15 Posts Drives: M Coupe Join Date: Jun 2007 Location: Chicago, IL USA iTrader: (0)	The charcoal filter is very likely not the problem and you can't rule out the PowerChip tune, that very well may have something to do with it, but... I will say that I had a similar issue with my 2006 Z4MC prior to any mods the car. It turned out to be an issue with the Vanos. That may be something you want to look into as well.
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02-06-2010, 10:10 AM	#10
thekurgan Bad Lieutenant 233 Rep 3,517 Posts Drives: E90M3 Join Date: Aug 2007 Location: Sacramento iTrader: (0) Garage List 2008 BMW M3 [0.00]	I'd put the charcoal filter back in before your trip to the dealership. __________________ 02 E39M5 \| TiAg/Schwartz \| Tubi Rumore \| Ultimate Ti Pedals \| E60 SSK \| Jim Blanton 3.45 40/100% \| Coby Alcantara \| StrongStrut STB
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02-06-2010, 01:10 PM	#12
pal Captain 433 Rep 753 Posts Drives: Z4 M Coupe Join Date: Nov 2007 Location: Seattle, WA iTrader: (2)	Could you be experiencing the lag of the stock CDV that causes clutch engagement at constant rate? If you shift and nail the throttle very fast, the clutch engagement may take a split second longer ...
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02-07-2010, 05:26 AM	#14
ga41 Lieutenant 31 Rep 503 Posts Drives: Z4 M Coupe Join Date: Jun 2009 Location: Paphos iTrader: (0) Garage List 2006 Z4 M Coupe [0.00]	Keep us updated as i also notice something similar. __________________
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02-07-2010, 11:27 AM	#16
Starscream Colonel 135 Rep 2,120 Posts Drives: ///M Roadster + E92 335i 6MT Join Date: Dec 2007 Location: Park Ridge NJ + Windermere FL iTrader: (23)	Have you tried resetting the throttle adaptation? Might be worth a try, I see you have software, I used to have an occasional feeling in my M very intermittent where some days it would feel low on power and unresponsive, Then the next time I drove it the feeling was back to normal at full power, I got the ESS tune and never had that since, but before I got the car tuned I did reset the throttle that a board member (epbrown) mentioned and it actually made the car better and more responsive __________________ Imola Red Roadster
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