370z Drag Racing Reaction Times

[1SkyRacing]

Using a 2011 370z base as a test vehicle this past summer we were unable to get a competitive reaction time. Leaving on the last yellow light consistently produced a very slow (~.300s) slow reaction time while leaving on the second tom last yellow consonantly produced a red light (-150s).

Considering the 370 has throttle y wire and assuming it is not a direct connection between foot pedal position throttle valve body position I'm thinking that the pedal may be tunable through the ECU?

Has anyone overcome this problem and if so how? With an uPrev tune?

Thanks in advance for you thoughtful input to this problem.

[jerryd1987]

the 370z has the throttle body open 100% nearly all the time, rpm and throttle is controlled directly at the intake valve with vvel.

[1SkyRacing]

Is there anyway to make the gas pedal more responsive? Less responsive?

Thanks,

[BusyBadger]

Bee * R rev limiter has a launch control mode, I've also seen some mention of people using UpRev as a two-step launch control system.

[1SkyRacing]

BusyBadger, thanks for your input. the Bee * R would work for a manual. Our car is a 7AT. We just need either to have no restriction on the gas when floored so the car moves more instantly or be able to add a little delay to get in the range of one or the other if the starting lights.

[jerryd1987]

from my understanding some cars can have vvel unlocked by uprev but seeing as how i havnt had a vq37 person come to me for work yet it hasnt been a high priority for me. i have glanced around and it does seem that there is some limitations and people complain.

so far what im seeing is
1)turn off VDC/DVC/Traction control or whatever you choose to call it. people seem to report major improvements in this area.
2)get some way to check oil temps, the vq37 is notorious for overheating the oil temps even stock when racing.
3)to tie into the above people have reported major changes between hot and cold response times.
4)try to get the tune get ahold of technosquare and uprev to see what your options are.

[BusyBadger]

Sky, have you checked out PedalBox?

[1SkyRacing]

I have seen that and it may help. For the price I was hoping that perhaps an Uprev box might do this an more. Anyone know?

Thank you

[jerryd1987]

thats not going to work, all those pedal amplifiers do the exact same thing, they tell the ecu the pedal is being pressed more then it is, its not actually changing anything and the "lag" ill still be there. the uprev is completely retuning how it might work IF it can retune the vvel. ive heard it can and ive also heard its only some models, just another reason i despise the 370z. ok if you dont plan on modifying it, but thats about it.

should most definitely setup a way to monitor oil temps though see what thats doing and make sure its not just the ecu acting funky from oil temps.

[jerryd1987]

i have a feeling this is driver though, a sportsman tree has half a second delay between each bulb, going off that your saying if you leave on the second to last bulb it takes .85 seconds for the car to move and .8 seconds if you leave on the last bulb that alone says there isnt consistence. ive driven and ridden in 370z's and know thats not even close to accurate, my wifes focus isnt even that slow and its a automatic focus and the 370 responds better then her car. i have a feeling a significant portion of this is the driver no offense. are you having someone stage you? you cant possibly hope to get a quality time without that. shallow vs deep stage alone can result in 3-4 tenths of a second on the reaction time. how are you launching? you simply wait for your light and mash the gas? thats a no go too, there is a reason guys bring the car up on a two step for serious competitors regardless of class, you should be at the very least holding a rpm on a manual and getting ready to release the clutch or on a auto slightly power breaking at a much lower rpm(which has the added benefit of preloading components and reducing stress). i can very easily see this being a combination of vvel, driver, and possibly high operating temp since a 2011 didnt have the oil cooler yet.

[1SkyRacing]

The time examples I gave aren't actual times, I put them just to give an idea. The car is auto. We tested leaving from an idle all the way up the maximum rpm that the brakes would still hold the car. I've made more than 50 passes. Shallow stage, deep stage and can't find a good spot to leave and get a close reaction time.

Simply put if I leave on the last yellow I'm consistently late while if I leave on the second to last I'm consistently red. I'm not trying to go .005 on every pass but .100 is too slow and -.050 is too red.

The car has been tested with multiple drivers with the same results.

Thanks for your consideration and input.

[jerryd1987]

if your getting .1 and considering that "too slow" for a stock auto car, well hate to break it to yah man but your going to find very very very few cars to top that, thats damn good especially considering the autos that nissan use are sub par at best. hell even if your showing a reaction time of .25 on a stock auto thats pretty good. want quicker then that get a stall converter and a upgraded valve body, thats the entire reason for them.

[1SkyRacing]

I was thinking a portion of the delay maybe in the pedal. I am aware that thr reaction times are not bad, just looking to improve. Hopefully without the need to rebuild the mechanics of the car.

Thanks Jerry

[1SkyRacing]

Was actually wanting to slow down the reaction and leave on the second yellow. Add some delay.