Drive by wire throttle input lag

scheherazade · 04-09-2009, 02:45 PM

Do any of the tunes address the 1/3 second or so delay in throttle application?

(To see what I mean, just put the car in neutral, and *quickly* smack the throttle petal and let it rebound. You'll notice that the petal returns completely back to rest before the RPM needle even budges. At which point the RPM will jump and fall back down to idle. The throttle is simply late compared to the petal.)

It's something that I don't have to deal with in my crappy old honda (mechanical throttle)... so I'd think BMW wouldn't have this kind of issue.

-scheherazade

Jordan O · 04-09-2009, 03:40 PM

roadkillrob · 04-09-2009, 03:47 PM

buy a sprint booster

Mr. 5 · 04-09-2009, 05:02 PM

I think that this issue is worse with Autos.
My manual seems to be working fine.

scheherazade · 04-09-2009, 05:25 PM

Quote:

Originally Posted by Mr. 5

I think that this issue is worse with Autos.
My manual seems to be working fine.

I have a MT.

For the longest time I thought it was a momentary turbo lag... but one day just sitting at a light I got bored and started tapping the accelerator. To my surprise, the engine was responding way the hell later.

Not just slow pre-spool (lag) response, but ZERO response altogether, and then it would respond after the petal had already returned to rest.

So far I am just preemptively applying throttle. But IMHO it shouldn't be like this.

Sprint booster just re-scales the throttle signal voltage. It doesn't make the ECU react to that voltage any sooner.

-scheherazade

04-09-2009, 02:45 PM	#1
scheherazade Major 36 Rep 1,467 Posts Drives: 09 GTR (& 93' accord!) Join Date: Sep 2008 Location: DC metro area iTrader: (8)	Drive by wire throttle input lag Do any of the tunes address the 1/3 second or so delay in throttle application? (To see what I mean, just put the car in neutral, and quickly smack the throttle petal and let it rebound. You'll notice that the petal returns completely back to rest before the RPM needle even budges. At which point the RPM will jump and fall back down to idle. The throttle is simply late compared to the petal.) It's something that I don't have to deal with in my crappy old honda (mechanical throttle)... so I'd think BMW wouldn't have this kind of issue. -scheherazade
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04-09-2009, 03:40 PM	#2
Jordan O Private First Class 9 Rep 136 Posts Drives: 2008 335i Coupe Join Date: Jul 2008 Location: Honolulu iTrader: (0)	__________________ 08 E92 335i Sparkling G. 6-speed.
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04-09-2009, 03:47 PM	#3
roadkillrob Major General 857 Rep 5,446 Posts Drives: 08 335i,22 X3M, 2012 C63 Black Join Date: Jul 2007 Location: Boston iTrader: (15)	buy a sprint booster __________________ 2022 X3M Brooklyn Grey 2008 E93 335i FBO 2012 Mercedes C63 Black Series Alanite Grey
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04-09-2009, 05:02 PM	#4
Mr. 5 Modder Raider 753 Rep 8,633 Posts Drives: M3 Join Date: Apr 2007 Location: Surf City, HB iTrader: (31) Garage List 2007 e90 335i [8.00]	I think that this issue is worse with Autos. My manual seems to be working fine. __________________ e36 M3 Coupe, e36 325i Sedan e90 335i--SOLD Best 60-130-------------9.15 Seconds------------------WWW.MR5RACING.COM
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