Gas Pedal Delay

XwChriswX · 06-10-2010, 03:35 PM

I get the same thing, which is why I gradually press harder, instead of just flooring it... The delay is kind of an annoyance... Apparently the computer's reaction time from signal input to throttle response is not at the speed my mind wants it at lol.

cfleming2226 · 06-10-2010, 03:41 PM

Quote:

Originally Posted by XwChriswX

I get the same thing, which is why I gradually press harder, instead of just flooring it... The delay is kind of an annoyance... Apparently the computer's reaction time from signal input to throttle response is not at the speed my mind wants it at lol.

I guess as long as its not a problem with the car I will adjust ... i just really get a kick when it tosses me back in my seat, and with I can make "racers" look silly!

Thanks for the responce!

xiven · 06-10-2010, 03:43 PM

just be careful...don't want to draw unnecessary attention to your car

LennyZCSD · 12-08-2012, 12:00 AM

Quote:

Originally Posted by cfleming2226

I guess as long as its not a problem with the car I will adjust ... i just really get a kick when it tosses me back in my seat, and with I can make "racers" look silly!

Thanks for the responce!

Try disabling the VCD control...

cheshirecat · 12-12-2012, 09:25 PM

Quote:

Originally Posted by LennyZCSD

Try disabling the VCD control...

Eh, I shouldn't have to disable VDC to make a somewhat rushed left turn.

Just to elaborate, there was no traction loss and the clutch was fully disengaged. The car just kind of fell on its *** for a few seconds, then surged forward.

It was without a doubt an engine management issue. The management and engine (other than intake/exhaust) is stock. I agree that some sort of torque management is to blame.

It's a lot like what other people have described here.

Definitely an eye-opener.

wstar · 12-13-2012, 07:12 AM

Quote:

Originally Posted by cheshirecat

Eh, I shouldn't have to disable VDC to make a somewhat rushed left turn.

Just to elaborate, there was no traction loss and the clutch was fully disengaged. The car just kind of fell on its *** for a few seconds, then surged forward.

It was without a doubt an engine management issue. The management and engine (other than intake/exhaust) is stock. I agree that some sort of torque management is to blame.

It's a lot like what other people have described here.

Definitely an eye-opener.

You'd be surprised how subtly intrusive VDC can be. "Torque Management" is exactly what it's doing. It's a nice safety feature for the careless random driver who bought a Z for looks, but the way it operates it has no business being engaged on a sportscar being driven properly. I sometimes leave mine on for everyday driving in rainy conditions on unknown roads, where perhaps I can't predict every puddle I might slip on. But, IMHO, it's hard to accept any complaint about the throttle/engine/etc with VDC engaged, especially for remote diagnosis over the intarwebs. Step one is turn that button off and reproduce your scenario.

OMGiGOTaZ · 12-13-2012, 07:24 AM

Quote:

Originally Posted by wstar

You'd be surprised how subtly intrusive VDC can be. "Torque Management" is exactly what it's doing. It's a nice safety feature for the careless random driver who bought a Z for looks, but the way it operates it has no business being engaged on a sportscar being driven properly. I sometimes leave mine on for everyday driving in rainy conditions on unknown roads, where perhaps I can't predict every puddle I might slip on. But, IMHO, it's hard to accept any complaint about the throttle/engine/etc with VDC engaged, especially for remote diagnosis over the intarwebs. Step one is turn that button off and reproduce your scenario.

I've started using sport mode more for turns rather than trying to finesse the Pedal... Even with VDC off... It's like the Manual guys say, the higher the RPM's the less bogging

IcedZ · 12-13-2012, 08:02 AM

Quote:

Originally Posted by wstar

Step one is turn that button off and reproduce your scenario.

Read the WHOLE thread. MANY of us HAVE. (ME!!) I turned that damn button off 90% of the time. I almost got into TWO accidents because of this problem. Hence why the car is gone. Well, one accident, and then I got rid of it because it wouldn't give me enough power to get going off of a hill and stalled out.

This is incredibly frustrating when people keep blaming VDC. It is NOT this. I even pulled that fuse.

bushman66 · 12-13-2012, 11:15 AM

Quote:

Originally Posted by wstar

You'd be surprised how subtly intrusive VDC can be. "Torque Management" is exactly what it's doing. It's a nice safety feature for the careless random driver who bought a Z for looks, but the way it operates it has no business being engaged on a sportscar being driven properly. I sometimes leave mine on for everyday driving in rainy conditions on unknown roads, where perhaps I can't predict every puddle I might slip on. But, IMHO, it's hard to accept any complaint about the throttle/engine/etc with VDC engaged, especially for remote diagnosis over the intarwebs. Step one is turn that button off and reproduce your scenario.

It is NOT the VDC. Repeat it is NOT the VDC. When it is hot outside the car flat out falls on its face off the line. Now that we are seeing cooler temps outside, no bogging or delay whatsoever. I run the Z1 34 row cooler and never see oil temps above 200-205, even in 110 degree PHX summer temps. When it is warm outside, the car bogs 100% of the time...including when the VDC is switched off.

LennyZCSD · 02-28-2014, 05:53 PM

Quote:

Originally Posted by cfleming2226

I guess as long as its not a problem with the car I will adjust ... i just really get a kick when it tosses me back in my seat, and with I can make "racers" look silly!

Thanks for the responce!

You also have an automatic, so there is an extra step in the response. The rev up and the tranny downshift. That's why I only run a manual it's in gear and out of the gate a like gunshot..

juld0zer · 05-17-2014, 08:05 PM

aside from the obvious causes (intake air temp, coolant temp and oil temps), what else could be causing this throttle lag???

I've pretty much eliminated IAT as the cause.

I'm now leaning towards the EGR system which involves the CVTC system. EGR is intended to reduce emissions by reducing combustion temperatures....by filling part of the cylinders with exhaust gas to effectively reduce the available volume for oxygen to enter/fill the cylinder.

This is no easy fit-a-blank experiment and will need someone with tuning experience to chime in... i've got an Uprev tuner license so if someone can guide me, i am happy to guinea pig my car for the benefit of everyone as we try to solve this mystery once and for all.

SouthArk370Z · 05-18-2014, 02:25 AM

Quote:

Originally Posted by juld0zer

aside from the obvious causes (intake air temp, coolant temp and oil temps), what else could be causing this throttle lag???
...

Knock sensor could be causing the problem. Going by what I've read on this site, vibration from the drivetrain or exhaust can also bang the sensor.

juld0zer · 05-18-2014, 10:43 AM

i've pondered that possibility but eliminated it because it seems a bit bizarre for an engine to develop a vibration or harmonic issue at certain operating temperatures. It's not impossible because i know the engine does vibrate a lot. I have the plastic engine covers removed and to avoid losing the nuts/bolts, i just nipped them up on the intake collector. I pop the hood once a week and 70% of them have become loose by several turns.

Cant be a bad batch of knock sensors either because of the widespread awareness of the problem.

The other issue is it seems that most people are complaining about the lag in 1st gear only. Assuming that most folks are running stock intakes, i'm willing to bet that they are experiencing heatsoak of the IAT sensor - ie, ecu sees the air entering the engine as being hotter than it actually is; due to radiant heat influences from the headers, radiator airflow etc.

There is, without a doubt a difference in throttle response between oil at 90*c or less with coolant at 87*c or less versus oil and coolant temps above these approximate figures. The simple stab-the-pedal test shows this in a no load scenario. Someone on here datalogged the lag and it clearly shows a delay of several seconds between pedal activity and throttle body activity with VDC off during a 1st gear takeoff - this was done with IAT at 104f/40c which is definitely in the high territory. This is the lag that keeps you at the lights while the wanker in the bone stock Civic takes off.

I have experienced severe 'heatsoak' by intentionally using a different IAT sensor (one which reads higher, ie different resistance curve for those familiar) and it will affect you even when you're moving. Overtaking is scary. Gaining speed takes an eternity. Not fun.

I'm wondering, for those of you with remapped throttle tables - do you still experience the acceleration lag both on take off and in-gear acceleration?

06-10-2010, 03:35 PM	#1 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 452	I get the same thing, which is why I gradually press harder, instead of just flooring it... The delay is kind of an annoyance... Apparently the computer's reaction time from signal input to throttle response is not at the speed my mind wants it at lol. REVRAY likes this. __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

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06-10-2010, 03:43 PM	#3 (permalink)
xiven A True Z Fanatic Join Date: Jun 2009 Location: Atlanta Age: 44 Posts: 4,128 Drives: Cookie Monster Rep Power: 294	just be careful...don't want to draw unnecessary attention to your car

05-17-2014, 08:05 PM	#11 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	aside from the obvious causes (intake air temp, coolant temp and oil temps), what else could be causing this throttle lag??? I've pretty much eliminated IAT as the cause. I'm now leaning towards the EGR system which involves the CVTC system. EGR is intended to reduce emissions by reducing combustion temperatures....by filling part of the cylinders with exhaust gas to effectively reduce the available volume for oxygen to enter/fill the cylinder. This is no easy fit-a-blank experiment and will need someone with tuning experience to chime in... i've got an Uprev tuner license so if someone can guide me, i am happy to guinea pig my car for the benefit of everyone as we try to solve this mystery once and for all.

05-18-2014, 10:43 AM	#13 (permalink)
juld0zer Enthusiast Member Join Date: Nov 2012 Location: Sydney Posts: 428 Drives: 11 Nissan 370Z MB M6 Rep Power: 139	i've pondered that possibility but eliminated it because it seems a bit bizarre for an engine to develop a vibration or harmonic issue at certain operating temperatures. It's not impossible because i know the engine does vibrate a lot. I have the plastic engine covers removed and to avoid losing the nuts/bolts, i just nipped them up on the intake collector. I pop the hood once a week and 70% of them have become loose by several turns. Cant be a bad batch of knock sensors either because of the widespread awareness of the problem. The other issue is it seems that most people are complaining about the lag in 1st gear only. Assuming that most folks are running stock intakes, i'm willing to bet that they are experiencing heatsoak of the IAT sensor - ie, ecu sees the air entering the engine as being hotter than it actually is; due to radiant heat influences from the headers, radiator airflow etc. There is, without a doubt a difference in throttle response between oil at 90c or less with coolant at 87c or less versus oil and coolant temps above these approximate figures. The simple stab-the-pedal test shows this in a no load scenario. Someone on here datalogged the lag and it clearly shows a delay of several seconds between pedal activity and throttle body activity with VDC off during a 1st gear takeoff - this was done with IAT at 104f/40c which is definitely in the high territory. This is the lag that keeps you at the lights while the wanker in the bone stock Civic takes off. I have experienced severe 'heatsoak' by intentionally using a different IAT sensor (one which reads higher, ie different resistance curve for those familiar) and it will affect you even when you're moving. Overtaking is scary. Gaining speed takes an eternity. Not fun. I'm wondering, for those of you with remapped throttle tables - do you still experience the acceleration lag both on take off and in-gear acceleration?