what bothers me more than the lag, is the bucking feel when the car is either cold or accelerating decently from a roll at low rpms in 1st/2nd gear.

Yup! I get that one as well even though the clutch is fully engaged and the pedal is still. It's like throttle movement is somewhat stuck and tries to apply more power to unstick itself. It happened to me over the weekend when I shifted to 3rd and kept steady acceleration close to redline before merging on the freeway. At times this is smooth, and other times it felt "clunky."

Then there are times where I'm in 2nd, steady throttle, the acceleration is a bit slow, car jerks, and it gets quicker as if I applied more throttle even though I didn't.

I'd like to go FI one day, which will void the warranty, but now I'm getting paranoid about VVEL actuator failure. :confused:

Welcome to the suck. I get that same hesitation as well.

This is what I've been suspecting, hence needing to record VVEL position and temperature data. Just been too busy! I'll be gone AGAIN this whole weekend (and not with my car). I think it's the ECU programming telling the VVEL to do something "wrong".

so after 19 pages no one has any idea yet?? ok i guess im in for updates

Same here. I'm bankin on DIGI pullin through on this one. He's the tech guy of the forums.

Haha not really :p Just curious mind with a bit of troubleshooting tendency at heart.

Fall weather is here with much cooler temperatures, so I'm not encountering laggy throttle response as often on my drive to and from work. It is still there, though. Easy test is to punch it in 3rd, and you can feel the car accelerate for a little bit and then it feels like you let off the throttle even though the foot is still planted. Go figure... :rolleyes:

Just get me a simple CSV file for each reading:
xxx,yyy
xxx,yyy
etc.

I finally got to spend some time looking at the service manual last night. I tried to follow the directions to read the values from the VVEL Actuator and sensors. None of the harnesses are very accessible. This is definitely not going to be easy. This is definitely an all day task.

well, i dont have what you guys are talking about. my car simps halls *** in all gears at all times no matter how hot or cold. i did unplug the bosch sensor to completely disable the VDC and Traction control so i have no interferance what so ever with the computer. i personally couldnt stand to drive a car that is acting the way you guys are describing. it sounds like the car is cutting power on you and thats what i use to feel before i disconnected the bosch sensor. well good luck to all of you because this would drive me insane enough to burn the car to the ground.

^ What I do notice about the 370Z is that VDC is a tad aggressive. Even slightly rough engagements will activate it. My 350Z came with TCS so I didn't remember it overreacting on dry pavement. The lagging does feel like VDC/TCS kicking in, but with no SLIP indicator even when it's [supposedly] disabled. O_o

Where is this sensor? Any drawbacks other than the lack of VDC/TCS at times when it is necessary?

Agreed. I was reading a couple of other threads on this last night, and apparently turning VDC off doesn't turn off ALL things related to traction control. Some people mentioned pulling a fuse; however that fuse controls your break lights too.
I second that... where is the sensor so I can try to unplug it.

No, the fuse trick is to allow you to left foot brake/brake torque the car. The ABLS kicks on if you have excessive wheel spin from one side, you will see a light coming on the dash when it is on. The throttle tune is very soft on the Z, that's why you dont get the immediate push. You just have to get used to it.

*sigh*
It's not that. I've put 29,500 miles on it... I think I'm "used to it" by now.

I'm still not sure about that. With the cool weather we've been having lately I haven't had the usual throttle lagging issues. If it's really the nature of the throttle programming, then temperature wouldn't be an issue.

True, unless the sensor gives wrong values when it's hot - a faulty sensor for example.