She's acting up....

onekneedown · 03-06-2010, 01:18 PM

Quote:

Originally Posted by KingZee

I was approaching the on ramp pretty fast in 3rd, I rev-matched and put it into second at about 4k rmp (possibly higher), the car was in gear before I took the turn and noticed it's not engine breaking for s***! I almost went into the f'ing curb and if I wasn't somewhat experienced I probably would have.

:

This is a question not a comment: When you match the revs when you down shift either with SRM or manually, would that reduce some of the engine braking?

speedworks · 03-06-2010, 02:56 PM

Quote:

Originally Posted by onekneedown

This is a question not a comment: When you match the revs when you down shift either with SRM or manually, would that reduce some of the engine braking?

I'm not exactly sure what you are asking, but if you downshift, and match the revs, yes 'engine braking' will occur. If you don't exactly match it, and maybe release the clutch at a lower rpm, then you will get that jerk feeling, and a little more initial 'engine braking' until the engine/rpms catch up to the proper rpm for that gear, and then you get the normal amount of 'engine braking'. Does that answer it?

IMWEZL · 03-04-2010, 02:47 AM

Yeah I only had it happen during Auto-x. I'll try to replicate somewhere safe since the car is going to Korea with me. If there is something Nissan could do I would like to get it done before then.

Pharmacist · 03-04-2010, 06:55 PM

why would the problem only happen on turns? how would g forces affect the throttling system? do the cars even have g sensors? if so they'd tie in with vdc. but vdc only cuts engine power, not increase it.

speedworks · 03-04-2010, 08:10 PM

Quote:

Originally Posted by Pharmacist

why would the problem only happen on turns? how would g forces affect the throttling system? do the cars even have g sensors? if so they'd tie in with vdc. but vdc only cuts engine power, not increase it.

Can't answer this question. I did get the impression from the service manager that Nissan engineering kind of already knew of the issue, and that it was related to the ecu program (which I believe). I used to own an SVT Focus when I worked for Ford, I was able to work with the SVT engineers to diagnose an issue with the throttle map (it would surge at constant cruising speeds) - it took them some time then to develop a new map for the ecu. So much electronics in these things, this issue doesn't surprise me. As for the other person above concerned about buying the car - all cars have issues, and my guess is most people won't be putting their cars in this situation that often (unless you drive close to the limit on turns). It bothers me when I feel it, but I now can predict it. I just look forward to the fix - ecu update is my guess.

Pharmacist · 03-04-2010, 09:59 PM

Quote:

Originally Posted by speedworks

Can't answer this question. I did get the impression from the service manager that Nissan engineering kind of already knew of the issue, and that it was related to the ecu program (which I believe). I used to own an SVT Focus when I worked for Ford, I was able to work with the SVT engineers to diagnose an issue with the throttle map (it would surge at constant cruising speeds) - it took them some time then to develop a new map for the ecu. So much electronics in these things, this issue doesn't surprise me. As for the other person above concerned about buying the car - all cars have issues, and my guess is most people won't be putting their cars in this situation that often (unless you drive close to the limit on turns). It bothers me when I feel it, but I now can predict it. I just look forward to the fix - ecu update is my guess.

still doesn't answer why it only happens on turns. are there any g force sensors or sensors for steering angle or yaw?

speedworks · 03-05-2010, 07:17 PM

Quote:

Originally Posted by Pharmacist

still doesn't answer why it only happens on turns. are there any g force sensors or sensors for steering angle or yaw?

That's why my first sentence says I can't answer that.

ChrisSlicks · 04-23-2010, 09:09 PM

Quote:

Originally Posted by speedworks

Can't answer this question. I did get the impression from the service manager that Nissan engineering kind of already knew of the issue, and that it was related to the ecu program (which I believe). I used to own an SVT Focus when I worked for Ford, I was able to work with the SVT engineers to diagnose an issue with the throttle map (it would surge at constant cruising speeds) - it took them some time then to develop a new map for the ecu. So much electronics in these things, this issue doesn't surprise me. As for the other person above concerned about buying the car - all cars have issues, and my guess is most people won't be putting their cars in this situation that often (unless you drive close to the limit on turns). It bothers me when I feel it, but I now can predict it. I just look forward to the fix - ecu update is my guess.

Any update there speed? My car just started exhibiting this behavior tonight while taking a ramp at speed. Wasn't close to the edge of traction but I was going quicker than average, around 5K in 3rd gear. While holding constant speed I felt the engine surge a couple of times pushing the car a little. Happened earlier in the day as well but at much lower speed, around 2K in 2nd or 3rd. Really don't like the feeling and I haven't experienced it up to this point. Only thing I changed recently was the Berk CBE.

speedworks · 04-27-2010, 10:05 AM

Nothing yet. I was away on vacation for the last week, and before that I called the dealership again, and still no solution (that they have been told). Honestly, until enough people bring these in, and complain about it, it won't be a priority.

"the squeaky wheel gets the grease"

I was actually hoping you didn't feel this issue, so we could meet up and see if I could make it happen - oh well. I'm so disappointed with this issue, that it makes me want to sell it, I can duplicate it on almost every on/off ramp (assuming no-one is in front of me).

ChrisSlicks · 04-27-2010, 10:40 AM

Quote:

Originally Posted by speedworks

Nothing yet. I was away on vacation for the last week, and before that I called the dealership again, and still no solution (that they have been told). Honestly, until enough people bring these in, and complain about it, it won't be a priority.

"the squeaky wheel gets the grease"

I was actually hoping you didn't fee this issue, so we could meet up and see if I could make it happen - oh well. I'm so disappointed with this issue, that it makes me want to sell it, I can duplicate it on almost every on/off ramp (assuming no-one is in front of me).

I've only had it twice and haven't been able to reproduce it at will. I am going to report it to the dealer anyway even though they won't be able to do anything.

KingZee · 03-05-2010, 01:12 PM

I'll take it in to the dealer as soon as I get a chance...I'll let you know what they say.

Zeto · 03-05-2010, 01:25 PM

Pharmacist, do you have a bigger pic of your avatar?

Slynky · 03-05-2010, 01:35 PM

Shades of Toyota...

Imagine with all the areas of the car a computer has control if Microsoft did the software design for it !

As to saying it might not affect a lot of people because a lot of people don't drive that hard, it's when a car is being driven hard that a computer logic fault is at its most dangerous point !

Nissan needs to take these things seriously and NOT "Toyota-Up"

j.arnaldo · 03-06-2010, 01:11 PM

The Toyota syndrome keeps spreading...

Hi-Step'n370Z · 03-06-2010, 03:16 PM

Is this only happening with the 6 speed manual, or does the 7 speed auto do it too?

03-04-2010, 06:55 PM	#4 (permalink)
Pharmacist A True Z Fanatic Join Date: May 2009 Location: Toronto, Ontario Posts: 1,249 Drives: 09 370z Sport 6MT Rep Power: 19	why would the problem only happen on turns? how would g forces affect the throttling system? do the cars even have g sensors? if so they'd tie in with vdc. but vdc only cuts engine power, not increase it. __________________ 2009 370z Sport Touring/Nismo shift Knob/Z1 motorsports 34 row oil cooler

04-27-2010, 10:05 AM	#9 (permalink)
speedworks Track Member Join Date: Jan 2009 Location: Boston, MA Posts: 550 Drives: PW purchased 01/09 Rep Power: 18	Nothing yet. I was away on vacation for the last week, and before that I called the dealership again, and still no solution (that they have been told). Honestly, until enough people bring these in, and complain about it, it won't be a priority. "the squeaky wheel gets the grease" I was actually hoping you didn't feel this issue, so we could meet up and see if I could make it happen - oh well. I'm so disappointed with this issue, that it makes me want to sell it, I can duplicate it on almost every on/off ramp (assuming no-one is in front of me). Last edited by speedworks; 04-27-2010 at 01:31 PM.

03-05-2010, 01:35 PM	#13 (permalink)
Slynky Track Member Join Date: Oct 2009 Location: McDonough, GA Posts: 595 Drives: 2010 Red 370Z T/S/N Rep Power: 17	Shades of Toyota... Imagine with all the areas of the car a computer has control if Microsoft did the software design for it ! As to saying it might not affect a lot of people because a lot of people don't drive that hard, it's when a car is being driven hard that a computer logic fault is at its most dangerous point ! Nissan needs to take these things seriously and NOT "Toyota-Up" __________________ A veteran is someone who, at one point in their life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including my life."

03-06-2010, 03:16 PM	#15 (permalink)
Hi-Step'n370Z Enthusiast Member Join Date: Dec 2009 Location: new york Posts: 425 Drives: '10ZR S/B AT Tour NV Rep Power: 278	she's acting up Is this only happening with the 6 speed manual, or does the 7 speed auto do it too?

03-04-2010, 02:47 AM	#3 (permalink)
IMWEZL Track Member Join Date: Apr 2009 Location: HNL Posts: 603 Drives: 370Z/MKVII GTI Rep Power: 18	Yeah I only had it happen during Auto-x. I'll try to replicate somewhere safe since the car is going to Korea with me. If there is something Nissan could do I would like to get it done before then.

03-05-2010, 01:12 PM	#11 (permalink)
KingZee A True Z Fanatic Join Date: Feb 2010 Location: Glendale, CA Age: 42 Posts: 2,612 Drives: Focus ST Rep Power: 424	I'll take it in to the dealer as soon as I get a chance...I'll let you know what they say.

03-05-2010, 01:25 PM	#12 (permalink)
Zeto Track Member Join Date: Apr 2009 Location: North NJ Age: 41 Posts: 766 Drives: 09 Pearl White 370Z Rep Power: 268	Pharmacist, do you have a bigger pic of your avatar?

03-06-2010, 01:11 PM	#14 (permalink)
j.arnaldo Banned Join Date: Oct 2009 Location: Puerto Rico Posts: 937 Drives: Nissan 350Z, 2004 Rep Power: 0	The Toyota syndrome keeps spreading...