Gas Pedal Delay

IcedZ · 09-09-2010, 02:13 AM

Quote:

Originally Posted by JayYoon

3-5 secs is a long time... r u sure thats the right amount of delay?

For me that's slightly exaggerated. It's more like 2 seconds (though I can't speak for everybody). However, I have been in situations where it feels like an eternity!

flashburn · 09-09-2010, 08:03 AM

So odd... I was doing a bunch of 0-60 runs last night to get my E-Tune done and didn't notice any real lag (maybe under half a second). I'm wondering if its tied to specific ECU's? I'm using the 1EA4B ECU.

m4a1mustang · 09-09-2010, 08:08 AM

Quote:

Originally Posted by cossie1600

Are some of you kidding me? 2 sec delay? Geez. That's right, there is a 2 sec delay in a car that runs 13 sec in the quarter mile.

Its no joke man. Its not a throttle response delay... throttle responds fine but immediately after gassing it the car bogs for 2-3 seconds before violently surging ahead. It feels like VDC is coming on and cutting power almost immediately after you get on the throttle. It happens anywhere below 4,000 rpm.

DIGItonium · 09-09-2010, 08:26 AM

With outside temps getting cooler I am not experiencing this problem as often compared to the summer temps that exceed 100F everyday.

There was once instance where I made a brief stop at Walgreens, went back out, started it up, and responsiveness came back. Try briefly shutting off the car and starting it back up to see if the problem goes away. I think it resolved the issue momentarily.

Does anyone experience jerking feeling (versus smooth and progressive) when gradually pressing the throttle down to the floor? It can be easily tested in 3rd gear. When it happens, giving it more gas in 1st feels like rough clutch engagement. Then in 2nd I quickly floor it briefly, and it doesn't push me back in the seat. It's like I went from 2nd to 6th.

I think we need to keep pouring in complaints to NNA.

cossie1600 · 09-09-2010, 08:48 AM

Quote:

Originally Posted by m4a1mustang

Its no joke man. Its not a throttle response delay... throttle responds fine but immediately after gassing it the car bogs for 2-3 seconds before violently surging ahead. It feels like VDC is coming on and cutting power almost immediately after you get on the throttle. It happens anywhere below 4,000 rpm.

You are driving a high revving V6, it's going to feel sluggish at the low RPM. My Prius felt stronger than my Z down low, but that is definitely not the case as verified by my datalogger

IcedZ · 09-09-2010, 09:09 AM

Quote:

Originally Posted by m4a1mustang

Its no joke man. Its not a throttle response delay... throttle responds fine but immediately after gassing it the car bogs for 2-3 seconds before violently surging ahead. It feels like VDC is coming on and cutting power almost immediately after you get on the throttle. It happens anywhere below 4,000 rpm.

PERFECT short description.

IcedZ · 09-09-2010, 09:12 AM

Quote:

Originally Posted by cossie1600

You are driving a high revving V6, it's going to feel sluggish at the low RPM. My Prius felt stronger than my Z down low, but that is definitely not the case as verified by my datalogger

Again.. it's *NOT* that. When the car is "normal" it's a linear feeling. With this problem, it's not linear in the least bit. You go from starting to accelerate, to *NO* power. Zip, nada, nothing... to an explosion. Like previously stated, it almost feels like VDC is kicking on for a sec.

RCZ · 09-09-2010, 09:14 AM

I have been experiencing this problem as well, but it seems like its related to heat because the car doesnt do it when its 180 oil temp or below.

m4a1mustang · 09-09-2010, 09:56 AM

Quote:

Originally Posted by cossie1600

You are driving a high revving V6, it's going to feel sluggish at the low RPM. My Prius felt stronger than my Z down low, but that is definitely not the case as verified by my datalogger

It's not that AT ALL.

You get on the throttle... the car responds instantly and takes off, only to immediately cut power, throw you forward in your seat (since you're bracing for acceleration), bog for a good 2-3 seconds, then all of a sudden violently take off again. It's got nothing to do with the fact that this is a high-revving V6.

IcedZ · 09-09-2010, 11:07 AM

Quote:

Originally Posted by RCZ

I have been experiencing this problem as well, but it seems like its related to heat because the car doesnt do it when its 180 oil temp or below.

I agree as well. I can't replicate the problem at night. I won't know what it's like during cooler weather for another month or 2.

cossie1600 · 09-09-2010, 12:29 PM

Quote:

Originally Posted by m4a1mustang

It's not that AT ALL.

You get on the throttle... the car responds instantly and takes off, only to immediately cut power, throw you forward in your seat (since you're bracing for acceleration), bog for a good 2-3 seconds, then all of a sudden violently take off again. It's got nothing to do with the fact that this is a high-revving V6.

if the engine actually stops and sounds quiet, its fuel cut due to starvtion.

oil temp doesnt effect the car as much as you think. i have a datalogger, car can accelerate just as fast at 270 oil temp vs 220

m4a1mustang · 09-09-2010, 12:33 PM

The engine doesn't cut. It's still running. It just feels like a fuel starvation event... that's the best way I can describe it.

All I know is some cars experience this, some don't. For those of us that do (or did) it's very annoying and sometimes dangerous.

6spd · 09-09-2010, 05:38 PM

Quote:

Originally Posted by WarmAndSCSI

The throttle plates on the VHR are fully open during normal operation - the VVEL actually throttles the engine by adjusting lift.

no ****! i didnt know that, im not familiar with new VQ's much at all, hardly ever have to work on them. the way i was describing the actions were just generalized concepts used in "most" electronic throttle cars. im glad you enlightened me!

WarmAndSCSI · 09-09-2010, 06:17 PM

Somebody needs to log the throttle plate position while this is happening.

I know on the Evo X, you can log the accelerator position separate from TPS - lets you know what the ECU is actually doing to limit throttle.

I'm guessing this won't tell you anything if what I've learned about the VVEL system is true - you'd have to be logging some other value that tells you how much valve lift the ECU is requesting of the VVEL system.

IcedZ · 09-09-2010, 10:30 PM

Quote:

Originally Posted by WarmAndSCSI

Somebody needs to log the throttle plate position while this is happening.

I know on the Evo X, you can log the accelerator position separate from TPS - lets you know what the ECU is actually doing to limit throttle.

I'm guessing this won't tell you anything if what I've learned about the VVEL system is true - you'd have to be logging some other value that tells you how much valve lift the ECU is requesting of the VVEL system.

Do you know of an affordable system that will allow me to do this?

09-09-2010, 08:03 AM	#227 (permalink)
flashburn A True Z Fanatic Join Date: May 2009 Location: Central Florida Posts: 1,884 Drives: '12 Corvette GS 6M Rep Power: 19	So odd... I was doing a bunch of 0-60 runs last night to get my E-Tune done and didn't notice any real lag (maybe under half a second). I'm wondering if its tied to specific ECU's? I'm using the 1EA4B ECU. __________________ Current Ride: 2012 Chevrolet Corvette Grand Sport Centennial Edition Carbon Flash 6M Previous Ride: 2009 Nissan 370Z Sport Platinum Graphite 7AT

09-09-2010, 08:26 AM	#229 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	With outside temps getting cooler I am not experiencing this problem as often compared to the summer temps that exceed 100F everyday. There was once instance where I made a brief stop at Walgreens, went back out, started it up, and responsiveness came back. Try briefly shutting off the car and starting it back up to see if the problem goes away. I think it resolved the issue momentarily. Does anyone experience jerking feeling (versus smooth and progressive) when gradually pressing the throttle down to the floor? It can be easily tested in 3rd gear. When it happens, giving it more gas in 1st feels like rough clutch engagement. Then in 2nd I quickly floor it briefly, and it doesn't push me back in the seat. It's like I went from 2nd to 6th. I think we need to keep pouring in complaints to NNA. __________________

09-09-2010, 12:33 PM	#237 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	The engine doesn't cut. It's still running. It just feels like a fuel starvation event... that's the best way I can describe it. All I know is some cars experience this, some don't. For those of us that do (or did) it's very annoying and sometimes dangerous. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

09-09-2010, 06:17 PM	#239 (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	Somebody needs to log the throttle plate position while this is happening. I know on the Evo X, you can log the accelerator position separate from TPS - lets you know what the ECU is actually doing to limit throttle. I'm guessing this won't tell you anything if what I've learned about the VVEL system is true - you'd have to be logging some other value that tells you how much valve lift the ECU is requesting of the VVEL system. __________________ '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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09-09-2010, 09:14 AM	#233 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	I have been experiencing this problem as well, but it seems like its related to heat because the car doesnt do it when its 180 oil temp or below.