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" :mad:

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

The Toyota syndrome keeps spreading...

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?

she's acting up
 

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

Manual is what I have

speedworks - I know exactly what you're talking about. Mine did the same thing and it was ANNOYING... if not dangerous... When I downshift and stay off the gas, I expect the car to engine brake... NOT maintain speed and/or accelerate... especially going into a turn aggressively.

My Z is currently at the dealership due to a massive oil consumption issue. Seems I have bigger issues to deal with....

^^ Since you already have the car at the dealership, tell them about this problem too. The more people that bring the car in for this issue, the faster the solution.

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.

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).

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.

Hey, heading to NHMS this weekend for my first race, if you are interested.

Is that the SCCA event? Sounds like fun, unfortunately I already have an auto-x event that day.

Yep, first SCCA race of the year - where's the solo?

Ayer, MA at the old Fort Devens army air strip. SCCA had their solo event there last Sunday. This week it's one of the smaller club's turns, which is my preference as it means less cars, more seat time and a longer course.

http://www.the370z.com/north-east-re...a-may-2nd.html

my 7AT only does the pulling bit when I go to second gear

all the others seem to engine brake just fine

I noticed it again this afternoon in 3rd gear on an exit ramp. I think it is related to the stock tune not liking after market exhaust parts.

I don't think it is related to exhaust parts - mine did it before any aftermarket parts (I only have an FI exhaust). What the exhaust did do though, was make it easier to hear it when it happens.

Could just be coincidence then but mine only starting doing it a couple of weeks after installing the Berk CBE. Do you think any of the 3rd party maps would help or is it something native to the ECU behavior?

Update: heard nothing from the dealer, but had a theory that the stability control was causing this issue so I started to run without the stability control on. No stability control, no problem. So...the stability control was maintaining throttle in the turn - and that is the answer. I think the mapping is too conservative - but maybe for basic drivers it could save them from a spin. So now when I want to be real aggressive, I turn off the stability control (ironic).

I can't believe you guys haven't figured this out yet.

This is caused by the emissions standards we have in this country. Almost all DBW cars do this now. When moderately heavy on the gas if you suddenly come completely off the gas the car is tuned to burn off all the gas that has already been injected into the head/intake manifold (depending on car). It's not much gas, but it is plenty to maintain rpm's for a second or two or even to make the rpm's jump when the clutch is put in.

This has happened on every DBW car I have driven (that is fairly new). My '09 Wrangler does it, and I noticed it in a '08 WRX, a '07 Civic, and a Genesis Coupe I test drove. I didn't notice it when I drove the 370z, but it was a 40th edition and it only had 15 miles so I didn't want to ruin someones future baby by driving it hard.

Try loading up the engine in 5th gear with fairly heavy throttle then jump off the gas and wait for a second or so then put in the clutch... you should see the revs hang or possibly even jump.

Again, I've been told time and time again it is an emissions control device where the car burns off all the gas that has already been injected to avoid it just moving through the engine un-burned or partially burned and emitting worse emissions.

I'm sure if I could find some articles on it online somewhere (I seem to remember even edmunds mentioning it), but I'm heading out the door to visit family out of town. I'll post more info later

These are not the symptoms. The car is inducing throttle in a turn for as long as it takes until the turn ends (not an emissions thing, but a stability control thing) to prevent any weight shifting. I was able to duplicate it at high speeds in turns (on/off ramps), with aggressive driving.

Just took the time to re-read what I posted this morning in a hurry, sorry if it came across as rude!!

That's an interesting thing about it only happening during a turn, must have missed that when reading the previous pages. It sounds similar though just only happening during a turn, really weird.

Just a thought, have you gone out to a large empty parking lot and induced this while just running a large circle and see how long it lasts? ...as in does it just maintain it for 30-40 seconds, or even more than a minute? Seems like a dangerous "feature"

Subscribed...

Just want to verify so I can try and replicate... high speed freeway exit (roundabout or what?) and downshift to a gear that will give me 4-5k of RPM, and let off the gas? This should cause me to keep accelerating or just get no engine braking?

No, I haven't done it in a parking lot. Usually I can do it on an off or on ramp, usually I have been in 3rd gear, 4-5k rpm. Make sure you have some experience at that speed in a turn - I usually scare my passenger :) I can make it last through a turn, about 5 seconds, but then the off/on ramp straightens out and then it decelerates like normal.

Honestly, when it first happens, it will scare the crap out of you, if you are entering the turn at high speeds (which is the requirement). I usually enter the turns at high speed, lift to scrub some speed off, and hope to accelerate out, but with the stability control on and when I take my foot off the pedal, it continues to drive - real freaky and uncomfortable. But, now I just turn off the stab. control.

Yes those are the exact symptoms I have experienced. I was carrying partial throttle in the turn but with slight deceleration to increase turn in. The car decided that the throttle should be enough to maintain constant speed which is not what I wanted because the corner tightens slightly. I ended up having way more speed at the end of the corner than I wanted which was a little dangerous, fortunately I left a little on the table and was able to safely negotiate the corner, but this safety feature can be dangerous. I would like to know which elements trigger the stability program to intervene like that.

^^ yeah, I don't think it was well thought out. I think it would work great for a car that had serious weight transfer problems during throttle lift at high rpm, but I don't think this car has that problem. It will eventually make someone wreck because of their response to the unexpected continuous stability control throttle. Oh well, now that I know, I turn it off.

I never noticed the connection between stability control and this problem. I always assumed it was an SRM problem. Makes sense i guess. I usually do turn the stability control off, but sometimes i forget to push that button before the urge to push the car a bit. Ill pay attention to see if i can duplicate it with the stability control on and off.

Thanks for the updates.

Well, after reading this thread on Sunday morning, I experienced the exact thing you are describing in a fast, constant radius ramp where I downshifted from 6th to 5th and then 4th.
If it wasn't for this thread, would have been a bit unnerved seeing as I wasn't trying to recreate the scenario you've been describing and my car was hurtling towards slower moving traffic on the ramp. Instead I kind of chuckled and said to myself "how 'bout that?"
Another reason to turn the VDC off, I guess.