Gas Pedal Delay

zero

No problem here after technosquare.

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christian370z

Maybe there is an issue with the VVEL servos not responding properly? Since VVEL does much of the throttle work at lower RPMs, shouldn't the VVEL assembly be the primary suspect?

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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

zero

Good point or ECU is too slow to process throttle position, fuel mapping, etc. before mechanically activating the VVEL.

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SE

Has anyone encountered this issue with VDC disabled? Even with it off, I think the car may still be in sort of a hand-holding mode....

IcedZ

Yep.. some of us (me) even pulled fuses. I also disconnected the Bosch yaw sensor one time.

IcedZ

Incredibly unlikely. Even if the processor is running at 20MHz (this is on the slow side, I'm sure its clock is more like 100MHz?), That's 50ns per clock cycle. And let's assume for fun that it only triggers on up or down edges, not both, that's 100ns per instruction. This is absolute worst case scenario. No way.

IcedZ

Technosquare doesn't tweak VVEL, right? I'm assuming VVEL is still not really "cracked"?

zero

I don't know if they cracked VVEL but I am very happy with their ECU.

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6spd

try the techno reflash Iced?!

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-Jay- jonathanjamesphotographer.com

IcedZ

I haven't, but I would love to! Definitely don't have the $ for that =(

Jamaica

it has been cracked. the VVEL. Its in the works in the testing phase

DIGItonium

There has to be some reason why the car starts losing throttle response after driving it for awhile. If it's a lag in the actuator system, then it would lag from the start. As for DBW, I never had issues with the VQ35DE power delivery. It was fun giving people whiplash when I tap the throttle, but that eagerness isn't there in the 370Z. It was eager to rev and felt like it had a light flywheel when I test drove it. :dunno:

For owners staying N/A, I'd like to see what the results of ECU tweaks would bring especially after driving for long periods. I'm planning to force feed this motor next year, so hopefully the ECU tweak will also improve low end response.

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zero

After I got the exhaust installed, I definitely felt the low end responsiveness was not as quick as stock. After technosquare ECU re-flash, the low end responsiveness is back and the car is pulling harder. Also I have not experienced any lost of responsiveness for an extended period of driving. Also before oil cooler installed, my Z temperature was at 240 during a normal driving and it went up around 260+ for a spirited driving. Again, I didn’t see any change in responsiveness.

The yellow Z in the Technosquare video is KillerBee370's. His Z was a mule for the 09 370Z ECU tuning. He had the first hand experience during the development. He did experience gas pedal delay and went back to technosquare for a minor adjustment. Tadashi of Technosquare did his magic. I’ve heard that technosquare will not offer ECU re-flash on the 2010+.

There are many people on here with UpRev. Maybe they want to chime in if they have experienced with gas pedal delay.

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christian370z

The one reason that I heard is that once the car is modified in a way which affects sensors (MAF, o2), these parameters the sensors are reading is off from the stock inputs which causes the ECU to interpret and then adjust which may take slightly longer for the ECU to respond to input such as the throttle. I felt the throttle response was a bit faster and more punchy after my tune but I never had anything near what some of you guys are getting in terms of lag and diminishing power.

Granted, there is a problem with stock Zs as well so this isn't a meaningful explanation.

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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

DIGItonium

IIRC, IcedZ is bone stock. Mine only has the pulleys and exhaust, but I already noticed the response issues prior to installing the mods. The pulleys improved it, but it did not resolve the low end power loss.

What I wonder is the difference in throttle response with the VQ35DE and the VQ37. The DE definitely has a stronger punch and a bit more aggressive tip in.

For those wondering about dyno charts, how can one graph the power band under 3k RPM? How can we get a visual of the power being cut or held back? It would be nice to get a visual on the 2.5k RPM stall or the clunky feeling (tech describes as fuel cut) as the tach revs to redline with 50-80% throttle in 3rd or 4th.

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