VDC not very intrusive?

Red__Zed · 03-14-2012, 11:24 PM

Quote:

Originally Posted by UNKNOWN_370

Year model has to be considered. We know that nissan is forever tweaking there cars in general and not making any announcements. You feel difference when you had time in each car. For example: salesguys that take Z's home feel the difference from year to year. Or like I did going from an 09 to an 11 on the suspension. 11's spring response is more refined in absorption of bumps.
Its possible to VDC has been mildly tweaked enough not to be as intrusive in 11-12???Which are the cars you are familiar with. 09-10 basically went untweaked except for some TSB's, small feature upgrades like brighter nav, screen, backup cam heated mirrors and air filter. 2011 marked subtle tweaks to improve overall ride and drive quality that weren't made known to the gen-pop, like sound deadening added. But most dealers and car reviewers do know of the mild refinements which occured. That's why the 2011 was re-reviewed by a few car mags.

I heard they also added an adjustable rev limiter to a select number of autos.

Quote:

Originally Posted by ImportConvert

I was driving smooth, not pushing the car. Exiting a banked corner in 3rd gear and rolling onto the throttle while straightening the wheel. I rolled onto it just fast enough to try to move the back end gradually. I felt it more 1-2" or so it felt, and VDC prevented any more. For the street, this is just fine, if not preferable, for me.

I am unsure as to why you quoted my post to say this.

Mike · 03-15-2012, 12:36 AM

Quote:

Originally Posted by ImportConvert

I never provoked the traction control in my 'vette. It stayed out of my way, I stayed out of it's way. Either that, or it was so seamless and gave no indication, that I never noticed it.

I am comparing the VDC to the TC in my 2001 Trans Am, which was HORRIBLE.

I never had a problem with my vette either. Also, I used comp mode on the track in the vette and it rarely ever kicked in, and when it did, it was gentle. A much better system.

Mike · 03-15-2012, 12:39 AM

Oh yeah, the fun thing in the vette. I ran non stock tire sizes for the track, square I think, but definitely shorter in back. With everything on, traction control would engage at 84 mph when the rears were spinning faster than they were supposed to compared to the fronts

Jordo! · 03-15-2012, 12:45 AM

There's a nice comparison of the VDC on the 350 vs the 370 on Australian Top Gear. Summary of review: Instills confidence in the driver rather than takes away control.

Of course, that is all relative.

Overall, I'd say if it doesn't feel intrusive, don't worry about it, and if it does, just switch it off

I leave mine on when in the rain or if just cruising from point A to B. I switch it off if I plan on playing with the car a bit.

BTW, VDC Off is OFF, but the wheel slip icon will still flash if you lose traction.

shaun66 · 03-15-2012, 12:56 AM

VDCyo

wstar · 03-15-2012, 12:56 AM

Quote:

Originally Posted by _ace_

"Sport Mode" and ALL electronic throttle"

If you have a 6MT car, and you don't mind the loss of Synchro-Rev-Match, you *can* disable all the electronic throttle interference via UpRev. There's a setting near the bottom of the config for "ETC off". You definitely lose SRM, and you probably also lose throttle rev limits (but I didn't test that), so you'd be on your own and then the hard fuel cut rev limits (normally there's a soft throttle rev limit before that). The throttle control is amazing though, it feels like an old school cable throttle again.

I couldn't keep it like that on my 7AT though, because the 7AT relies on SRM to shift smoothly. It's horribly and clunky with ETC off.

Jordo! · 03-15-2012, 01:00 AM

Quote:

Originally Posted by wstar

If you have a 6MT car, and you don't mind the loss of Synchro-Rev-Match, you *can* disable all the electronic throttle interference via UpRev. There's a setting near the bottom of the config for "ETC off". You definitely lose SRM, and you probably also lose throttle rev limits (but I didn't test that), so you'd be on your own and then the hard fuel cut rev limits (normally there's a soft throttle rev limit before that). The throttle control is amazing though, it feels like an old school cable throttle again.

I couldn't keep it like that on my 7AT though, because the 7AT relies on SRM to shift smoothly. It's horribly and clunky with ETC off.

Interesting -- with ETC off will it still automatically down shift if you drop to about 1.5 K RPM or no?

If so, I may try it -- that's my ONE complaint about the 7AT. I'd like it to hold the gear even if the revs drop, unless it's approaching idle.

wstar · 03-15-2012, 01:03 AM

I didn't test the auto-downshift with ETC off, but in general ETC off + 7AT isn't a usable combination, I don't think. When you try to downshift it can't match right and goes all clunky. I only tried it for about a quarter mile then pulled over and re-programmed though. Maybe if I played with it more I could figure out whether you can match revs yourself with the 7AT in that mode, but I'm not sure how tricky the timing would be, given all the various internal bits engaging and disengaging on their own time and lagged from the button input.

UNKNOWN_370 · 03-15-2012, 01:06 AM

[QUOTE=Red__Zed;1600240]I heard they also added an adjustable rev limiter to a select number of autos.

you are so right loverboi.

Jordo! · 03-15-2012, 01:12 AM

Quote:

Originally Posted by wstar

I didn't test the auto-downshift with ETC off, but in general ETC off + 7AT isn't a usable combination, I don't think. When you try to downshift it can't match right and goes all clunky. I only tried it for about a quarter mile then pulled over and re-programmed though. Maybe if I played with it more I could figure out whether you can match revs yourself with the 7AT in that mode, but I'm not sure how tricky the timing would be, given all the various internal bits engaging and disengaging on their own time and lagged from the button input.

Hmm. I see -- if you do some more experimenting let me know

UNKNOWN_370 · 03-15-2012, 01:40 AM

How would you rev match without a clutch?

ImportConvert · 03-15-2012, 01:56 AM

Quote:

Originally Posted by UNKNOWN_370

How would you rev match without a clutch?

Automatics have clutches. Even ones with tq converters. Also, hydraulic lock-up is indeed following the same concept as a clutch, it's just viscous.

wstar · 03-15-2012, 07:59 AM

Exactly. Our 7AT's actually really good about the lockup part too, it's only squishy for a brief moment mid-shift. The shifting logic relies on the 7AT's own version of SRM though, which dies when you turn ETC off. Now I'm really tempted to go play with it more and see if it's possible to make up for the loss of ETC by trying to manually match. I think the problem is going to be that the window for blipping is going to be very tiny and a little bit unpredictable though.

ImportConvert · 03-15-2012, 08:02 AM

Quote:

Originally Posted by wstar

Exactly. Our 7AT's actually really good about the lockup part too, it's only squishy for a brief moment mid-shift. The shifting logic relies on the 7AT's own version of SRM though, which dies when you turn ETC off. Now I'm really tempted to go play with it more and see if it's possible to make up for the loss of ETC by trying to manually match. I think the problem is going to be that the window for blipping is going to be very tiny and a little bit unpredictable though.

I wouldn't. Unless of course you are cool with replacing the 7AT on your dime.

UNKNOWN_370 · 03-15-2012, 10:00 AM

Quote:

Originally Posted by ImportConvert

Automatics have clutches. Even ones with tq converters. Also, hydraulic lock-up is indeed following the same concept as a clutch, it's just viscous.

I understand that. But I mean functionally. If DRM is disabled or not working properly when VDC is off? And we need to blip the throttle with no manual clutch? How do we still achieve rev-matching manually without computer assistance? That's my question.

03-15-2012, 12:39 AM	#63 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2186	Oh yeah, the fun thing in the vette. I ran non stock tire sizes for the track, square I think, but definitely shorter in back. With everything on, traction control would engage at 84 mph when the rears were spinning faster than they were supposed to compared to the fronts __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

03-15-2012, 12:45 AM	#64 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	There's a nice comparison of the VDC on the 350 vs the 370 on Australian Top Gear. Summary of review: Instills confidence in the driver rather than takes away control. Of course, that is all relative. Overall, I'd say if it doesn't feel intrusive, don't worry about it, and if it does, just switch it off I leave mine on when in the rain or if just cruising from point A to B. I switch it off if I plan on playing with the car a bit. BTW, VDC Off is OFF, but the wheel slip icon will still flash if you lose traction. __________________ Enjoy it. Destroy it.

03-15-2012, 01:03 AM	#68 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	I didn't test the auto-downshift with ETC off, but in general ETC off + 7AT isn't a usable combination, I don't think. When you try to downshift it can't match right and goes all clunky. I only tried it for about a quarter mile then pulled over and re-programmed though. Maybe if I played with it more I could figure out whether you can match revs yourself with the 7AT in that mode, but I'm not sure how tricky the timing would be, given all the various internal bits engaging and disengaging on their own time and lagged from the button input. __________________ 7AT Track Car! Journal thread / Car setup details

03-15-2012, 01:06 AM	#69 (permalink)
UNKNOWN_370 A True Z Fanatic Join Date: Jul 2009 Location: ny'r livn in tx Posts: 8,687 Drives: well over 130m.p.h. Rep Power: 14858	[QUOTE=Red__Zed;1600240]I heard they also added an adjustable rev limiter to a select number of autos. you are so right loverboi. Last edited by UNKNOWN_370; 03-15-2012 at 01:09 AM.

03-15-2012, 07:59 AM	#73 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Exactly. Our 7AT's actually really good about the lockup part too, it's only squishy for a brief moment mid-shift. The shifting logic relies on the 7AT's own version of SRM though, which dies when you turn ETC off. Now I'm really tempted to go play with it more and see if it's possible to make up for the loss of ETC by trying to manually match. I think the problem is going to be that the window for blipping is going to be very tiny and a little bit unpredictable though. __________________ 7AT Track Car! Journal thread / Car setup details

03-15-2012, 12:56 AM	#65 (permalink)
shaun66 Track Member Join Date: Mar 2010 Location: n Posts: 837 Drives: MB 370z 7AT Rep Power: 16	VDCyo

03-15-2012, 01:40 AM	#71 (permalink)
UNKNOWN_370 A True Z Fanatic Join Date: Jul 2009 Location: ny'r livn in tx Posts: 8,687 Drives: well over 130m.p.h. Rep Power: 14858	How would you rev match without a clutch?