Gas Pedal Delay

christian370z · 09-02-2010, 07:44 PM

Quote:

Originally Posted by DIGItonium

Are any of you guys finding out the car doesn't really accelerate that well when punching it in 2nd or 3rd from a roll? It's like accelerating in 6th. I literally floor it around 20-30mph, and it doesn't quite go anywhere. It does initially, but when I'm almost home it starts to get lazy.

Yes, and you know these cars have more bottom end than that. I find it frustrating that I can get more acceleration if I go part throttle low down than I can if I floor it in the situations you are describing.

I am hoping Seb at SpecialtyZ will be able to perk it up a bit but if I feel that it still needs to be sharpened up, I will get the SprintBooster without a doubt.

For those who bought it; have you tried it on the most aggressive setting? Does it make the throttle extremely sensitive?

Westwood · 09-02-2010, 07:46 PM

Quote:

Originally Posted by christian370z

Yes, and you know these cars have more bottom end than that. I find it frustrating that I can get more acceleration if I go part throttle low down than I can if I floor it in the situations you are describing.

I am hoping Seb at SpecialtyZ will be able to perk it up a bit but if I feel that it still needs to be sharpened up, I will get the SprintBooster without a doubt.

For those who bought it; have you tried it on the most aggressive setting? Does it make the throttle extremely sensitive?

from all the reviews they say its extremely sensitive. but you get used to it

IcedZ · 09-02-2010, 10:33 PM

I am going to talk to Nissan about this after this weekend. I almost got T-boned today due to near zero response for a full second+. Like others have stated, it tends to be ok toward the beginning, but half way through my trip it starts really lacking low end. I have 6MT, TC was OFF, outside temp 94F (approx). Oil was 220F.
This could be a SERIOUS safety issue. Especially if it's fine (or not terrible) at one instant, then DEAD in another. If I ease on the pedal, it actually responds better than if I stomp it. But when there is oncoming traffic, your gut is to stomp... not the best idea.

christian370z · 09-03-2010, 02:17 AM

Quote:

Originally Posted by IcedZ

If I ease on the pedal, it actually responds better than if I stomp it. But when there is oncoming traffic, your gut is to stomp... not the best idea.

Spot on, rolling into the throttle yields the best results. If you floor it immediately, it has a bit of hesitation as if it is thinking about going and then it takes off. I don't feel it as much above 4k rpm but low down is aweful.

IcedZ · 09-03-2010, 07:49 AM

Quote:

Originally Posted by christian370z

Spot on, rolling into the throttle yields the best results. If you floor it immediately, it has a bit of hesitation as if it is thinking about going and then it takes off. I don't feel it as much above 4k rpm but low down is aweful.

Yep and yep. I agree with the 4k RPM.

DIGItonium · 09-03-2010, 08:23 AM

You guys are right, this is a potentially dangerous issue (i.e., stuck on the railroad tracks type). After driving home from work yesterday, I don't think it's an oil temp issue though I use it as an indicator of how long the car was driven. On startup, the response is pretty good and better with VDC inactive. However, it is still not as peppy as the 350Z. In the 350Z, tapping the throttle can induce whiplash. After 10-15 minutes or so of driving the throttle response becomes increasingly laggy the longer I drive it.

Do you guys manually blip the throttle when downshifting? It's harder to manually rev match in this car than the 350Z. You literally have to tap the throttle over 50% and wait a little bit, or you'll end up bogging when downshifting. On the 350Z, the throttle is so sensitive simply resting your foot on it will cause it to rev quick.

Plus, on startup when progressively pressing down on the gas pedal in 2nd-4th the feeling is pretty linear. Later on, doing the same thing you will feel a bit of a "clunk" as if the car starts revving up at a certain rate and then abruptly cuts to a slower rate.

I messaged NNA a few days ago, and this is their response:

Quote:

Thank you for contacting Nissan North America, Inc. regarding your concern with your 2009 370Z. We apologize for any inconvenience this situation may have caused you.

Nissan relies on its authorized dealers to provide technical support to our valued customers. Please contact or visit your local Nissan dealer, as they are in the best position to address your vehicle concerns.

File #6918991 has been created to document your inquiry. If you have any further questions or comments, feel free to call Nissan Consumer Affairs at 1‑800‑647‑7261 and reference your file number.

Thank you again for contacting us and allowing us the opportunity to be of assistance.

Sincerely,

Nissan North America, Inc.

Zat_Zuma · 09-03-2010, 10:17 AM

I have the slight throttle response delay as well. One thing I've noticed is that when the throttle is pushed down, the oil pressure drops immediatly (roughly 5 psi) and then the car will accelerate. I would possibly suggest it may very well be the time delay in the VVEL opening up to accelerate the car. With heat soak and high oil temps, it could very well be the changes in VVEL position causing the delays.

my

Zeto · 09-03-2010, 10:40 AM

Quote:

Originally Posted by Zat_Zuma

I have the slight throttle response delay as well. One thing I've noticed is that when the throttle is pushed down, the oil pressure drops immediatly (roughly 5 psi) and then the car will accelerate. I would possibly suggest it may very well be the time delay in the VVEL opening up to accelerate the car. With heat soak and high oil temps, it could very well be the changes in VVEL position causing the delays.

my

OMG! I thought it was just me! I also installed an oil pressure guage. I just thought I had a faulty guage. But you are correct it does drop on oil pressure then rises back up when you accelerate.

jaedub · 09-03-2010, 01:08 PM

It could be the VDC. Turn it off if youre ever gonna floor your car. If VDC doesnt cut it, then work your way with the clutch

KusoSama · 09-03-2010, 01:19 PM

I think it's a combination of the VDC and the ECU's programmed throttle response thresholds based on current RPM.

I'd be interested to know if the SB actually does anything beneficial.

Westwood · 09-03-2010, 04:52 PM

hey guys just did a lil review bout the sprint booster

Sprint Booster review for 370z 7 speed AT

WarmAndSCSI · 09-03-2010, 05:41 PM

This is interesting. On the Evo X, which is also DBW, there is a 2D table that lets you ramp up the throttle response just like the SprintBooster does. In fact, in stock form, there is quite a bit of throttle input ramping on the Evo X. This must not be the case for the 370Z.

I wonder if such a table that maps throttle input to actual throttle plate movement exists on the 370Z. I'm sure UpRev knows about it if it does.

6spd · 09-03-2010, 05:55 PM

Quote:

Originally Posted by Westwood

hey guys just did a lil review bout the sprint booster

Sprint Booster review for 370z 7 speed AT

great review!

ChrisSlicks · 09-03-2010, 06:32 PM

Quote:

Originally Posted by KusoSama

I think it's a combination of the VDC and the ECU's programmed throttle response thresholds based on current RPM.

I'd be interested to know if the SB actually does anything beneficial.

The stock pedal sends a voltage of 0 to 5V to the ECU to let the ECU know the pedal position, the voltage change is linear but the ECU can react to this voltage anyway it likes. The SprintBooster simply increases the voltage coming from the pedal such that you reach full voltage more quickly, i.e. you are shorting the pedal travel because the 3/4 pedal position is now WOT. You can do the same exact thing inside the ECU, so I say don't waste money on this just buy an UpRev license and do much more.

Kcuba370z · 09-03-2010, 06:34 PM

the delay is its downshifting ,remm its a 7 speed so the higher gear your in the longer the delay..downshift on your own and see what happens..

09-03-2010, 10:17 AM	#172 (permalink)
Zat_Zuma A True Z Fanatic Join Date: Nov 2008 Location: Edmonton, Alberta ...eh Posts: 1,171 Drives: 2017 Touring auto Rep Power: 19	I have the slight throttle response delay as well. One thing I've noticed is that when the throttle is pushed down, the oil pressure drops immediatly (roughly 5 psi) and then the car will accelerate. I would possibly suggest it may very well be the time delay in the VVEL opening up to accelerate the car. With heat soak and high oil temps, it could very well be the changes in VVEL position causing the delays. my __________________ [B]2009 & 2017 370Z Touring Sport Autos SOLD

09-03-2010, 04:52 PM	#176 (permalink)
Westwood Track Member Join Date: Feb 2010 Location: Ottawa,Canada Posts: 745 Drives: C63 AMG Rep Power: 16	hey guys just did a lil review bout the sprint booster Sprint Booster review for 370z 7 speed AT __________________ 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

09-03-2010, 05:41 PM	#177 (permalink)
WarmAndSCSI A True Z Fanatic Join Date: May 2010 Location: SLC, UT Posts: 1,671 Drives: '08 Evo X \| '10 370Z Rep Power: 18	This is interesting. On the Evo X, which is also DBW, there is a 2D table that lets you ramp up the throttle response just like the SprintBooster does. In fact, in stock form, there is quite a bit of throttle input ramping on the Evo X. This must not be the case for the 370Z. I wonder if such a table that maps throttle input to actual throttle plate movement exists on the 370Z. I'm sure UpRev knows about it if it does. __________________ '10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake '08 Evo X - built motor+trans \| BB-X @ 32 psi \| CH3OH \| self-built+tuned - ??? WHP '01 Galant V6 - built motor \| GT35R \| self-built+tuned - 550+ WHP (retired)

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09-02-2010, 10:33 PM	#168 (permalink)
IcedZ Base Member Join Date: Feb 2009 Location: Gainesville, FL Posts: 194 Drives: 09 370 Yellow, 6MT Rep Power: 16	I am going to talk to Nissan about this after this weekend. I almost got T-boned today due to near zero response for a full second+. Like others have stated, it tends to be ok toward the beginning, but half way through my trip it starts really lacking low end. I have 6MT, TC was OFF, outside temp 94F (approx). Oil was 220F. This could be a SERIOUS safety issue. Especially if it's fine (or not terrible) at one instant, then DEAD in another. If I ease on the pedal, it actually responds better than if I stomp it. But when there is oncoming traffic, your gut is to stomp... not the best idea.

09-03-2010, 01:08 PM	#174 (permalink)
jaedub Track Member Join Date: Aug 2010 Location: Los Angeles Posts: 906 Drives: 2010 Black 370Z MT Rep Power: 305	It could be the VDC. Turn it off if youre ever gonna floor your car. If VDC doesnt cut it, then work your way with the clutch

09-03-2010, 01:19 PM	#175 (permalink)
KusoSama Base Member Join Date: Jul 2010 Location: UP Posts: 127 Drives: 2010 370Z Sport MB Rep Power: 15	I think it's a combination of the VDC and the ECU's programmed throttle response thresholds based on current RPM. I'd be interested to know if the SB actually does anything beneficial.

09-03-2010, 06:34 PM	#180 (permalink)
Kcuba370z Enthusiast Member Join Date: Aug 2010 Location: New York Posts: 340 Drives: Z34 Rep Power: 15	the delay is its downshifting ,remm its a 7 speed so the higher gear your in the longer the delay..downshift on your own and see what happens..