Gas Pedal Delay

kenny's 370z · 08-01-2012, 12:52 PM

call it bs or whatever but i grounded the tb's last night and today i noticed the response has improved even further on the same 2 mile stretch that has 4 sharp turns in 93 degree heat with the ac on.so far,i have noticed an improvement from the stuttering or lag or whatever.anything to help with that hesitation.i feel when i get my catch cans on and change plugs,i should be good.

edit;check this page out.its on a mazda but still.
http://www.mazdas247.com/forum/showt...udboxer)/page9

wstar · 08-01-2012, 01:48 PM

I'm dubious of the benefits of grounding the TB's. Maybe if you had an existing wiring problem with the throttle position sensors and/or actuators in them or something. Seeing as how the TBs aren't naturally grounded (connected to plastic intake), I'd imagine they wouldn't bother having the body of the sensor/actuator ground out to the TB to begin with (meaning, grounding the TB may do nothing electrically regardless), but I have to admit I haven't pulled the sensor/actuator out and looked.

The only thing less reliable than a butt dyno is a butt impression of gas pedal responsiveness issues

IcedZ · 08-01-2012, 03:32 PM

Quote:

Originally Posted by wstar

I'm dubious of the benefits of grounding the TB's. Maybe if you had an existing wiring problem with the throttle position sensors and/or actuators in them or something. Seeing as how the TBs aren't naturally grounded (connected to plastic intake), I'd imagine they wouldn't bother having the body of the sensor/actuator ground out to the TB to begin with (meaning, grounding the TB may do nothing electrically regardless), but I have to admit I haven't pulled the sensor/actuator out and looked.

The only thing less reliable than a butt dyno is a butt impression of gas pedal responsiveness issues

If you want to try the grounding thing, do not pay the crazy $ for a kit. Do a hack job yourself first for trial. Any 12ga or bigger speaker wire will work FINE.
Source: I am an electrical engineer.

chops · 08-01-2012, 06:58 PM

Quote:

Originally Posted by IcedZ

If you want to try the grounding thing, do not pay the crazy $ for a kit. Do a hack job yourself first for trial. Any 12ga or bigger speaker wire will work FINE.
Source: I am an electrical engineer.

seriously, you can get the necessary wire from home depot for 20bucks with all the connections you'd ever want

prochobo · 08-01-2012, 06:25 PM

I've can honestly say I'm lucky and don't have this problem. In manual mode, throttle response isn't an issue; it just sucks waiting for the downshifting. VDC or no VDC, it's all good. Just my .02.

IcedZ · 08-02-2012, 08:18 AM

Quote:

Originally Posted by prochobo

I've can honestly say I'm lucky and don't have this problem. In manual mode, throttle response isn't an issue; it just sucks waiting for the downshifting. VDC or no VDC, it's all good. Just my .02.

If you read through the thread, for the most part you'll see this problem doesn't plague automatics for the most part.

wstar · 08-02-2012, 09:45 AM

Well there's certainly nothing in the 6MT itself that would contribute to the issue, seeing as it's just a gearbox. If anything more people would complain of something like this on a 7AT than a 6MT, as there's a whole host of additional possible problems with the 7AT that could cause similar effects, on top of whatever's going on prior to the trans that some 6MT guys are seeing.

IcedZ · 08-02-2012, 01:26 PM

Quote:

Originally Posted by wstar

Well there's certainly nothing in the 6MT itself that would contribute to the issue, seeing as it's just a gearbox. If anything more people would complain of something like this on a 7AT than a 6MT, as there's a whole host of additional possible problems with the 7AT that could cause similar effects, on top of whatever's going on prior to the trans that some 6MT guys are seeing.

Read through the other 52 pages.

wstar · 08-02-2012, 04:40 PM

Quote:

Originally Posted by IcedZ

Read through the other 52 pages.

My statement was based on logic, the other 52 pages are irrelevant in that sense.

binary0x01 · 08-02-2012, 04:59 PM

Quote:

Originally Posted by wstar

My statement was based on logic, the other 52 pages are irrelevant in that sense.

Lol, that's actually a valid statement.

ChipsWithDips · 08-02-2012, 01:40 PM

I have done some datalogs my 370 and noticed that the throttle never opens all the way until RPM is above 2000. Is this what you guys are experiencing?

kenny's 370z · 08-02-2012, 03:17 PM

interesting link here.from my understanding of how the vvel works,it is my assumption that in the higher rpm band,the intake valves are letting more blowback in via higher valve lift vs lower rpm band via lower valve lift.could this be the culprit ? letting too much blowback in ?
Nissan Introduces New Engine Valve Control Technology - Variable Valve Event & Lift (VVEL)

IcedZ · 08-03-2012, 08:25 AM

Quote:

Originally Posted by kenny's 370z

interesting link here.from my understanding of how the vvel works,it is my assumption that in the higher rpm band,the intake valves are letting more blowback in via higher valve lift vs lower rpm band via lower valve lift.could this be the culprit ? letting too much blowback in ?
Nissan Introduces New Engine Valve Control Technology - Variable Valve Event & Lift (VVEL)

I've been suspecting something to do with this, but it isn't all the time which leads me to believe some sensor is malfunctioning under certain conditions, causing erroneous data to be input to the computer.

kenny's 370z · 08-03-2012, 09:27 AM

Quote:

Originally Posted by IcedZ

I've been suspecting something to do with this, but it isn't all the time which leads me to believe some sensor is malfunctioning under certain conditions, causing erroneous data to be input to the computer.

i agree.this morning my car was losing alot of power and what seemed to be missing like i was running on 4 plugs periodically.maybe in my case,its the cats.this is twice now since ive owned it that this has happened.

tb grounds are coming back off today.last time i ran the car it was 95 with a heat index of 102.this morning it was 75 degrees.is it possible to run the car with vvel unplugged for testing purposes ?

what about the people that run test pipes,do they have this problem also ? i want to try an eliminate troubleshooting the 02's before i waste my time unhooking the exhaust to have a look at the cats

lemon-fresh · 08-02-2012, 06:39 PM

Quote:

Originally Posted by ChipsWithDips

I have done some datalogs my 370 and noticed that the throttle never opens all the way until RPM is above 2000. Is this what you guys are experiencing?

Pretty sure that's the issue. MT guys can just ride the throttle and then drop the clutch so they don't really experience the delay in the same way. Which makes me wonder why the AT is always rated as having quicker accel.

08-01-2012, 12:52 PM	#1 (permalink)
kenny's 370z Base Member Join Date: Jun 2012 Location: TN Age: 60 Posts: 243 Drives: 2012 frontier sv v6 Rep Power: 14	call it bs or whatever but i grounded the tb's last night and today i noticed the response has improved even further on the same 2 mile stretch that has 4 sharp turns in 93 degree heat with the ac on.so far,i have noticed an improvement from the stuttering or lag or whatever.anything to help with that hesitation.i feel when i get my catch cans on and change plugs,i should be good. edit;check this page out.its on a mazda but still. http://www.mazdas247.com/forum/showt...udboxer)/page9 Last edited by kenny's 370z; 08-01-2012 at 01:20 PM.

08-01-2012, 01:48 PM	#2 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	I'm dubious of the benefits of grounding the TB's. Maybe if you had an existing wiring problem with the throttle position sensors and/or actuators in them or something. Seeing as how the TBs aren't naturally grounded (connected to plastic intake), I'd imagine they wouldn't bother having the body of the sensor/actuator ground out to the TB to begin with (meaning, grounding the TB may do nothing electrically regardless), but I have to admit I haven't pulled the sensor/actuator out and looked. The only thing less reliable than a butt dyno is a butt impression of gas pedal responsiveness issues __________________ 7AT Track Car! Journal thread / Car setup details

08-02-2012, 09:45 AM	#7 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	Well there's certainly nothing in the 6MT itself that would contribute to the issue, seeing as it's just a gearbox. If anything more people would complain of something like this on a 7AT than a 6MT, as there's a whole host of additional possible problems with the 7AT that could cause similar effects, on top of whatever's going on prior to the trans that some 6MT guys are seeing. __________________ 7AT Track Car! Journal thread / Car setup details

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08-01-2012, 06:25 PM	#5 (permalink)
prochobo Base Member Join Date: Apr 2011 Location: Louisville, KY Posts: 54 Drives: 09 370Z T/S 7AT Rep Power: 16	I've can honestly say I'm lucky and don't have this problem. In manual mode, throttle response isn't an issue; it just sucks waiting for the downshifting. VDC or no VDC, it's all good. Just my .02.

08-02-2012, 01:40 PM	#11 (permalink)
ChipsWithDips Enthusiast Member Join Date: Mar 2011 Location: Austin, TX Posts: 279 Drives: '11 Gunmetal 370Z MT Rep Power: 16	I have done some datalogs my 370 and noticed that the throttle never opens all the way until RPM is above 2000. Is this what you guys are experiencing?

08-02-2012, 03:17 PM	#12 (permalink)
kenny's 370z Base Member Join Date: Jun 2012 Location: TN Age: 60 Posts: 243 Drives: 2012 frontier sv v6 Rep Power: 14	interesting link here.from my understanding of how the vvel works,it is my assumption that in the higher rpm band,the intake valves are letting more blowback in via higher valve lift vs lower rpm band via lower valve lift.could this be the culprit ? letting too much blowback in ? Nissan Introduces New Engine Valve Control Technology - Variable Valve Event & Lift (VVEL)