Gas Pedal Delay

wilsonp

But I think the 1-2s lag combined with it happening primarily when warm means it should be possible to narrow it down, just a lot of work.

__________________
2014 Cayman S PDK Sport Chrono White/Black
Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon
Was 1991 NSX Auto Black/Black

6spd

sound like you guys have a good grasp on this. good luck! Im very interested in the results if you can get any!

__________________
-Jay- jonathanjamesphotographer.com

DIGItonium

I've not had time to write the graphing program. Once I know what the log file looks like, then I can write the code to parse the rows and columns of data.

Today ambient temps hovered around 65F for the high. With the engine bay cooler than usual throttle response is the way it should be. I can press the pedal close to 50% in 1st and 2nd and be able to get the car moving immediately with no delay.

Of course, after a longer duration of the drive (15+ min.) the throttle starts lagging and doesn't open up as much as anticipated. I can floor it in 2nd and 3rd. The exhaust gets loud, but the car doesn't seem to accelerate much at all. It's very gradual as if throttle isn't opening up fully.

Then I make a quick stop to get stuff. Get back in and get moving, and throttle response is normal again for several minutes.

I'm not quite sure if Sprint Booster is going to fix this problem especially when I try to floor it and the car barely accelerates, but only when it's cooler.

__________________

DIGItonium

Heh... I'm pretty sure you guys are annoyed by my bump posts for this thread. I'm wondering if all this lack of response has to do with the current programming of the VVEL actuators. After doing some reading about the VVEL TSB for G37 owners, some owners were complaining that the reprogrammed ECM made the engine unresponsive. So for those who wonder about VVEL software adjustments, it is possible, but at the price of enduring the knocking noise?

Here's a quote and response:
MyG37 - View Single Post - ITB08-028a - Noise from bank 2 VVEL actuator (amended 9/3/08)

From FreshAlloy:

__________________

IcedZ

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".

Valentino

^ Interesting

__________________
Lou Fusz Nissan | KW V3 | SPL rear camber and toe bolt | OS Giken LSD | Nismo Diff cover | Engine Oil cooler | F.I. TDX Cat Back 18" Resonators | F.I. Resonated Test Pipes | Injen cold air intake | COBB AccessPORT | JWT Clutch Flywheel |

J. Dub

If this problem were a dinosaur, it'd be a failaciraptor.

Count me in as someone w/ the lagging acceleration problem.

6spd

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.

__________________
-Jay- jonathanjamesphotographer.com

DIGItonium

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.

__________________

J. Dub

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

__________________
My car is not responding.

kevin8086

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

J. Dub

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

__________________
My car is not responding.

DIGItonium

Haha not really 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...

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

__________________

IcedZ

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.

kevin8086

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.