[WS6FirebirdTA00]

I have noticed this on other BMWs I have driven that there is a delay on take off when you hit the throttle.

I assume this is normal? I have heard all sorts of things to the extent that it is adaptive and learns the driver. I don't know about that one.

Response is fine when rolling in other gears, it just seems to be an issue in 1st and when taking off. Bothers me sometimes if I am trying to pull out quick, I feel like I have to give it more throttle and then it is too much. Is this just some sort of torque management/traction logic the computer does to slowly open the throttle or?

[chancejat]

its called turbo lag.....

[WS6FirebirdTA00]

No, I mean I give it throttle, it waits a second or two and then responds to my input. I am not talking about hard throttle acceleration, I am talking about leaving a light around 10% throttle or so. I notice the same thing on NA auto cars as well.

[WS6FirebirdTA00]

http://www.e90post.com/forums/showth...throttle+delay

Found this after getting through about 15 pages of search, now time to read lol

[scheherazade]

Originally Posted by WS6FirebirdTA00

No, I mean I give it throttle, it waits a second or two and then responds to my input. I am not talking about hard throttle acceleration, I am talking about leaving a light around 10% throttle or so. I notice the same thing on NA auto cars as well.

Yeah, I felt that on mine too.

I could actually tap my throttle, and hear it rebound completely to zero, and THEN see the rpm just begin to rise.

Granted the lag was maybe a quarter second or so - but I could feel it driving around. Pretty annoying.

-scheherazade

[Willizm]

Nice bird btw, I have noticed the same thing. It's hard to say exactly what it is, but you do get use to it. I was expecting it to almost react similar to my T/A, but it does seem to delay itself. First I thought it was the torque converter, but I don't think it's that. It feels like it's limiting itself from a standstill and it is not turbo lag. Haven't felt that with any other car I've driven.

[WS6FirebirdTA00]

Thanks man. I just wanted to make sure this was considered "normal". If I let the car roll then give it gas it acts fine. Didn't know if it was an issue or not, but it sounds like it isn't. Most new cars are feeling like this, makes me love the cable drive TB on the T/A lol

[bo.benson]

It's usually due to not acutally having a mechanical linkage straight to the throttlebody. I've noticed it on almost every "fly by wire" vehicles I've driven, my last truck an 06 Dodge 2500 Cummins was the worst. You could put the accelerator to the floor and back quick as possible and you could easily have your foot off the pedal for a second or two before the rpms started to fall. It also would prevent you from doing many quick spool ups in traffic because you had to fight the truck to slow down with the brakes as the rpms were still climbing. Nothing to me replaces the cable, I have an 04 GTO and if I ever go the ls3 or lsx route you can bet there will be no fly by wire TB on the car. Cable is responsive as your foot is, with no electronics involved.

[Fried_rice]

I haven't noticed this on my 6spd 335i. My step dad's Lexus LS430 is horrible, literally more than a 1 second delay. It's so bad it's made the difference of switching lanes and not. I know companies make modules that reduce the "lag time" for Lexus, maybe there is one for BMW too.

[WS6FirebirdTA00]

I have my buddy's C6 Corvette tuned to where the throttle response of the ETC is just as good as a cable TB. Just depends on how the software is setup unfortunately. I was hoping it was something else with this car lol

I have driven two manual 335s here lately and one of them had a horrible delay and the other did not. This was very noticeable on a downshift when trying to rev match.

[bo.benson]

Originally Posted by WS6FirebirdTA00

I have my buddy's C6 Corvette tuned to where the throttle response of the ETC is just as good as a cable TB. Just depends on how the software is setup unfortunately.

Yea I'm not really saying its all of them, as my duramax and most other chevrolet trucks are very responsive. Just seems as some manufacturers software systems are a little slow. I just like the fact that my foot actually controls the cable and not a sensor, wires, a computer, a motor and electricity. Even though this is the route that almost everyone has gone.

[Alan l.]

Noticed this with a auto 328 loaner that i got a few weeks ago. I could stab the throttle and release it quick.....the rpms on the tach would barely move. Never noticed this with my 335 MT though.

Alan

[M4TW]

Are you sure it just isn't DSC intervention? Try turning DTC on or turn DSC completely off. It seems like horrible lag when it may just be DSC cutting power to stop wheel spin

[WS6FirebirdTA00]

I am not sure, I meant to check that as well. That was another thought that it was some logic to prevent wheel spin on takeoff in 1st by limiting throttle. I'm not used to all this fancy stuff, I unplugged the motor in the T/A for TCS so it is always off (becuase it sucked)

[E90 87ss]

The n/a cars have this problem too. Fixed with PBX, get a JB3, Procede or possibly sprint booster... Honestly, I think the lag is pretty dangerous. I'm coming from a throttle cable...

[bo.benson]

With a traction issue it should be illuminating on the dash as it happens...just a thought.