Gas Pedal Delay

L8N8

Hotter weather does make the issue worse but I've had the delay happen on a morning where it was no warmer than 60 F.

The ONLY time that I don't get this problem is in the first 15min after I start the car. After that, the delay is there every time I hit the gas.

DIGItonium

I wonder if the G37 community still has or still has similar issues. All I remember was the complaint about not using the ester oil causing throttle response problems with VVEL.

Although VVEL is neat-o and keeps the torque band flat I wouldn't mind switching to the VQ38HR from the 380RS. I never had throttle response issues with the 350Z other than the transmission killing the fun. Nowadays when I'm in the passenger seat of a 350Z, I'm usually pinned to the seat at low revs... something I miss

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christian370z

Can't a good tune add some low end torque to the car's power band? I was under the impression that there is a bit of headroom to make some more torque down low which would be a great asset as the VQ37 is a bit gutless down low.

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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

6spd

no, a honda is gutless down low. the z is good down low, but nothing to write home about.

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-Jay- jonathanjamesphotographer.com

Zeto

oro

We suffer from the same crap. Accelerate - Pause- Launch.

6spd

ive been driving around all morning here in south florida, 90+ degree heat, 210 oil temps, vdc off, and no problems at all. power on demand, as long as the gear and rpm were appropriate. to me, vdc is such a buzz kill with its throttle cutting that ive decided to only turn it on when the temps outside are real low, when it rains, and on the highway.

now i dont know if vdc has anything to do with this problem, as some of you say you have experienced he problem even with vdc off, but it may be that. or it may be operator error, vvel, or some other problem. Until we get a cooperative dealer or tuner to tell us what is going on, we're left with our thumbs up our asses.

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-Jay- jonathanjamesphotographer.com

WarmAndSCSI

I experienced this first hand today since I had the Z to myself... I'd downshift from 7th to 3rd or 4th and punch it as it was shifting into the destination gear, and it would result in a 1 second pause or so before power delivery really kicked in. I don't know if I want to just buy an Osiris tuner and tune out the lag, or if one of the modules would be worth my money.

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6spd

i personally would rather have a tune than lose the ability to better modulate the throttle, which i would expect from a chip that goes WOT in a shorter pedal press.

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-Jay- jonathanjamesphotographer.com

Westwood

agree but how much will it be for a tune 600$+

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Mods: Stillen G3 | Stillen lightweight crank pulley | Berk hfc's | Top speed pro 1 CBE | Jic Magic y pipe | 20" Vossen 9.5/10.5 | Megan Coilovers | Smoked JDM tail lights | Blacked out headlights | Sprint booster | Shine Auto CF Front/Rear lip kit | Evor R CF Side blades,CF fang cover,CF Nose Audio: Kenwood Excelon DNX9960 | JL 1000w | JL 12W6v2

6spd

yep. it would seem that for getting rid of the slight delay and it being worthwhile, you'd either have to have money to burn or a damn good reason, like the z being your competitive track car. neither are probably in the realm of possibility for a lot of us, rendering the need for this gadget or a tune (strictly for this reason) relatively unneeded.

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-Jay- jonathanjamesphotographer.com

Zeto

Once again guys, I have an Uprev tune and still have this issue.

christian370z

Yes, but that could just be that your tuner did not play with the throttle mapping. From what I have been told by popular tuners like SpecialtyZ and Technosquare (along with members who have been tuned) is that effective tuning of the throttle maps can make a big difference.

This coming wednesday, I am getting my Z tuned so I will be letting you know!

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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

cossie1600

Also note how the problem seems to be more noticeable on automatic cars? I bet Nissan just dumbs down the throttle response even more to protect the AT. If I recall correctly, the automatic I drove did the same exact thing

DIGItonium

The automatic Z I test drove over a year ago did not have this issue, and the temps were cooler at the time it was being tested. It was the first time testing a 370Z, and my initial impression was that it was eager to rev to past 3k with little throttle tip in. I was sold and ordered the 6MT.

What I would like to see done since I don't have the funds to get the appropriate tools, is to get a data acquisition board of some sort to record the voltages for the gas pedal, ECU outputs, VVEL outputs, stepper motor inputs, and temperatures in different areas including the stepper motor assembly. All of this data would be logged and graphed to observe temperature and the relationship of the signals controlling throttle response.

The gas pedal voltage should be 100% linear from 0-5V.
The ECU throttle output may not have a 1:1 correlation to the gas pedal potentiometer.
The VVEL controller, which I know nothing about, I will assume is a black box with input and output to control the stepper motor.

Somewhere along the lines of capturing this data and graphing it we should see somewhere in the system of gas pedal travel (2nd gear, pressing pedal from position 0 to max) we should be able to graph the delays and compare it to temperature. Obviously something's getting hot and slow. Has anyone felt the stepper motors? That thing is scorching hot. I'd be curious to know where the VVEL "box" is located as well.

[EDIT] Service manual indicates there are terminals for the VVEL Control Shaft Position sensor, so the voltage levels can be measured here. Then there's the VVEL Actuator motor which we can probably log and compare with the sensor values. Just for kicks, we can log the TPS sensor as well.

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