Gas Pedal Delay

Vegitto-kun · 06-21-2010, 10:26 AM

Quote:

Originally Posted by cossie1600

Stab your throttle real quick and back off in netural, you will see the noticeable lag

Don't seem to have any lag.

Jordo! · 06-20-2010, 10:17 PM

Hmm. Sounds (anecdotally, anyway) like a more common issue with 09's. Nissan might have made some sort of minor update to the TPS logic on the newer ECU's.

I wonder if it's a problem in the first batch of 09's and was corrected mid way through -- any TSB's on that?

m4a1mustang · 06-20-2010, 10:39 PM

Well, fwiw, seems like we are talking about a couple different things here. One is throttle input lag, the other is where the car responds to throttle input but doesn't accelerate.

IcedZ · 06-21-2010, 09:08 AM

Quote:

Originally Posted by m4a1mustang

Well, fwiw, seems like we are talking about a couple different things here. One is throttle input lag, the other is where the car responds to throttle input but doesn't accelerate.

Agreed. I have an early '09 with 24k+ miles on it, and I notice a slight lag if you stomp it and let off. But the other problem being addressed is a SERIOUS lack of response. I have never seen that on mine. I had an '07 350, that was VERY responsive.

KillerBee370 · 06-21-2010, 10:02 AM

Quote:

Originally Posted by IcedZ

Agreed. I have an early '09 with 24k+ miles on it, and I notice a slight lag if you stomp it and let off. But the other problem being addressed is a SERIOUS lack of response. I have never seen that on mine. I had an '07 350, that was VERY responsive.

This

IcedZ · 06-22-2010, 08:29 AM

Quote:

Originally Posted by IcedZ

Agreed. I have an early '09 with 24k+ miles on it, and I notice a slight lag if you stomp it and let off. But the other problem being addressed is a SERIOUS lack of response. I have never seen that on mine. I had an '07 350, that was VERY responsive.

Oh, forgot to add.. 6MT

CrownR426 · 06-22-2010, 08:35 AM

Get a tune if you don't like the delay

Nico 6 · 06-22-2010, 09:25 AM

Blitz Thottle Controller will get rid of that lag. I was thinking of installing it on my G.

BLITZ POWER SITE / THROTTLE CONTROLLER

YouTube - Blitz throttle Control

It wont let me embed the video from yuotube for some reason

cossie1600 · 06-22-2010, 10:35 AM

emission and fuel economy

dlmartin81 · 06-22-2010, 09:21 PM

Also...if I have the AC running, the symptoms are even worse.

Jordo! · 06-22-2010, 10:20 PM

With the A/C running, in part throttle at least, the compressor is syphoning off some power which will make it feel more laggy.

There's a bunch of little issues that might contribute to these driveability foibles (but again, I still see more 09 complaints... hmmm)

1. Hotter ambient temps (summer...) means less dense air, means less power,

2. No throttle cable means less response may be tuned in to improve emissions, ecomonmy, etc.

3. All EFI'd cars tend to have some spark retard on tip in to control torque and minimize drivetrain wear.

4. Some power will be lost as oil temps creep over 230*F.

5. Some power transfer may be minimized when VDC is on to improve traction.

Most of those issues are tunable/correctable...

m4a1mustang · 06-23-2010, 05:56 AM

Its not a tip in issue, though. Like I said before, initial response is there. It starts to pick up, then it faqlls on its face and throws you forward (because you were bracing for acceleration). The engine tries to wind up but there is no power... then 3-4 seconds later it takes off rather violently. It almost feels like it could be a problem with VVEL, where it is stuck in a limp mode then instantly switches over to full power.

ChrisSlicks · 06-23-2010, 07:27 AM

Quote:

Originally Posted by m4a1mustang

Its not a tip in issue, though. Like I said before, initial response is there. It starts to pick up, then it faqlls on its face and throws you forward (because you were bracing for acceleration). The engine tries to wind up but there is no power... then 3-4 seconds later it takes off rather violently. It almost feels like it could be a problem with VVEL, where it is stuck in a limp mode then instantly switches over to full power.

Hmm, that really doesn't sound good at all. Almost sounds like a fuel cut, but the question would be what is the cause of the cut? Could be VVEL, starvation or something else. I'm discounting VDC because you said it has happened with it switched off.

m4a1mustang · 06-23-2010, 08:00 AM

Quote:

Originally Posted by ChrisSlicks

Hmm, that really doesn't sound good at all. Almost sounds like a fuel cut, but the question would be what is the cause of the cut? Could be VVEL, starvation or something else. I'm discounting VDC because you said it has happened with it switched off.

The thing is, it even happens below full throttle as well. Case in point this morning... making a right turn from a stop sign onto a slow road, I eased out of the clutch and gave it probably 25% throttle at ~1500 rpm to briskly accelerate and again... nothing... then a surge of power after a few seconds of absolutely nothing.

I don't know if it's just me being over sensitive to the serious lack of torque in the 370Z, or if something may actually be wrong. I need to get the car on a dyno and probably see if I can drive another Z to compare the dynamics... Not quite sure what the hell is going on.

Above 4k RPM, though, the car feels like a champ.

IcedZ · 06-23-2010, 09:07 AM

When I put the car in neutral and hood up with stereo, A/C off (so I can listen), I press the pedal down and I can hear a "woosh" of air being sucked into the intake, but no response for a couple of seconds. Again, I would like to point out that this is occurring only at temps ABOVE 220F.

06-20-2010, 10:17 PM	#2 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 420	Hmm. Sounds (anecdotally, anyway) like a more common issue with 09's. Nissan might have made some sort of minor update to the TPS logic on the newer ECU's. I wonder if it's a problem in the first batch of 09's and was corrected mid way through -- any TSB's on that? __________________ Enjoy it. Destroy it.

06-20-2010, 10:39 PM	#3 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6964	Well, fwiw, seems like we are talking about a couple different things here. One is throttle input lag, the other is where the car responds to throttle input but doesn't accelerate. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

06-22-2010, 08:35 AM	#7 (permalink)
CrownR426 A True Z Fanatic Join Date: Nov 2008 Location: South Korea Posts: 4,676 Drives: Manual Rep Power: 849	Get a tune if you don't like the delay __________________ Love + Hardwork + Passion RIP SVTRacer

06-22-2010, 09:21 PM	#10 (permalink)
dlmartin81 Track Member Join Date: Dec 2008 Location: Chalfont, PA Age: 45 Posts: 923 Drives: 09 370Z Rep Power: 609	Also...if I have the AC running, the symptoms are even worse. __________________ Dan F.I. SS CBE 18-R \|\| Llumar 40% tint

06-22-2010, 10:20 PM	#11 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 420	With the A/C running, in part throttle at least, the compressor is syphoning off some power which will make it feel more laggy. There's a bunch of little issues that might contribute to these driveability foibles (but again, I still see more 09 complaints... hmmm) 1. Hotter ambient temps (summer...) means less dense air, means less power, 2. No throttle cable means less response may be tuned in to improve emissions, ecomonmy, etc. 3. All EFI'd cars tend to have some spark retard on tip in to control torque and minimize drivetrain wear. 4. Some power will be lost as oil temps creep over 230F. 5. Some power transfer may be minimized when VDC is on to improve traction. Most of those issues are tunable/correctable... __________________ Enjoy it. Destroy it. Last edited by Jordo!; 06-22-2010 at 10:23 PM.*

06-22-2010, 09:25 AM	#8 (permalink)
Nico 6 Base Member Join Date: Aug 2009 Location: Naples, FL Posts: 54 Drives: G37 Coupe Rep Power: 18	Blitz Thottle Controller will get rid of that lag. I was thinking of installing it on my G. BLITZ POWER SITE / THROTTLE CONTROLLER YouTube - Blitz throttle Control It wont let me embed the video from yuotube for some reason

06-22-2010, 10:35 AM	#9 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 32	emission and fuel economy

06-23-2010, 05:56 AM	#12 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6964	Its not a tip in issue, though. Like I said before, initial response is there. It starts to pick up, then it faqlls on its face and throws you forward (because you were bracing for acceleration). The engine tries to wind up but there is no power... then 3-4 seconds later it takes off rather violently. It almost feels like it could be a problem with VVEL, where it is stuck in a limp mode then instantly switches over to full power. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

06-23-2010, 09:07 AM	#15 (permalink)
IcedZ Base Member Join Date: Feb 2009 Location: Gainesville, FL Posts: 194 Drives: 09 370 Yellow, 6MT Rep Power: 18	When I put the car in neutral and hood up with stereo, A/C off (so I can listen), I press the pedal down and I can hear a "woosh" of air being sucked into the intake, but no response for a couple of seconds. Again, I would like to point out that this is occurring only at temps ABOVE 220F.

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