VDC not very intrusive?

m4a1mustang · 03-15-2012, 10:01 AM

Quote:

Originally Posted by UNKNOWN_370

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.

My guess is we probably can't without assistance.

UNKNOWN_370 · 03-15-2012, 10:12 AM

Has. Anyone tried to possibly test if when VDC is off? Maybe Rev-match works better from the paddles vs the stick or vice-versa? I know its connected into the same transmission but there is a noticeable performance between shifting on paddles vs shifting on the stick. The paddles snap much quicker. Maybe in the speed difference of gear changes may have an affect on "Rev-matching with VDC off???"

I'm just sayin'. Something to explore??? Maybe? I guess I won't be testing that one out.: lol

LMBmikeZ · 03-15-2012, 11:22 AM

Unknown I find the rev matching is perfect in my m6 with vdc on or off makes no difference. As for between a7 vs m6 that could be a little harder to compare.

As mentioned before if you modify the suspension you will have vdc kick in much more often! I found this to be true after I installed my springs and spacers. Ever since then I have been driving with it off because I find there is to much interference even with normal daily driving. It would kick in when it didn't need to at all.

kenchan · 03-15-2012, 11:30 AM

yah, VDC on/off does not seem to change the SRV on my car either.

wstar · 03-15-2012, 11:40 AM

Re manually rev-matching the 7AT:

Quote:

Originally Posted by ImportConvert

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

I don't think it would hurt it in the short term to play with it for a few days. They take a lot of abuse and keep ticking, and it's really just some shocky engagements while experimenting.

Quote:

Originally Posted by UNKNOWN_370

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.

SRM isn't disabled when VDC is off. This was just a side-topic that sprung up about SRM being disabled when ETC is off. ETC stands for Electronic Throttle Control, and can only be disabled via UpRev, not dash buttons. In the 7AT case, when you click a shifter paddle, after a short delay the compter goes through a sequence of clutching out of the old gear and into the new gear and blips the throttle in the middle. The question is whether it's practical to time that out manually and do it yourself or not. It's definitely theoretically possible, just possibly impractical.

The Service Manual has some pictorials about the underlying processes, e.g.:

The last line there "Engine Speed Control Demand" basically means "The time window for which the TCM wants to control your throttle for blipping purposes". With ETC off it can't do so, and you have to do the same with your foot.

slo · 03-15-2012, 12:20 PM

I think opinions will vary from driving skill, preferences, and situation. I have had the VDC kick in a couple of times and for the twisties, it was "ok", not pushing too hard. Still leaving that margin for error. But if I were doing a track day, it's a bit much for myself.

I got out of AWDs (sti and 2 evos) due to being what I call a cheater car. Meaning those cars are very easy to push hard, so many electronics, the evo's with neutral (IX) and slightly rear biased (X) and every eletronic aid you could ask for. Makes novice drivers look like they are veterans at the track as long as they are willing to push the car.

I feel that the 370z will not let you get that far. I don't know for sure since the car is new and I haven't been to the local race track yet so this is just my "temporary" haha $0.02.

2011_6Spd · 03-15-2012, 10:27 PM

Only times I've had VDC kick in is when I hadn't yet drive a few miles and warmed up the tires. Cold tires on the Z equals not much traction.

_ace_ · 03-16-2012, 02:38 PM

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.

I would miss SRM as I find the Z's pedals a PITA to heel toe with, but that's great to know! I won't be doing much to the car until our finances change in about 2-3 years, but that just pushed an Uprev tune up a few notches on my list of what to get when.

spearfish25 · 03-16-2012, 07:12 PM

Quote:

Originally Posted by ImportConvert

I provoked VDC today coming out of a corner. I didn't provoke it that much, but I saw the flashing light, and felt a slight taper in power delivery. It felt very intelligent and did not upset the car by "over compensating".

Does VDC maintain this intelligent personality throughout the performance envelope?

If you do something abrupt, VDC will be equally abrupt in its correction. Similarly, slowly approaching the envelope will invoke a much more subtle VDC interaction. I've noticed that when I use VDC track, VDC can be very 'sneaky'. I'll think I took a corner perfectly and everything feels great, and then I look down and see the VDC flashing (realizing the little Japanese engineers helped me take the corner). While its initial assistance is pretty subtle in those situations where you ease up to the limit, I do find it's painfully annoying on corner exit no matter what you do. It continues to retard power during the corner exit when it should really let you just drop the hammer out of the corner.

wstar · 03-17-2012, 03:17 AM

Aside from the corner exit scenario, the other situation I've seen it behave badly in was holding steady throttle while turning in (after braking, but before the apex). If you're slipping the wheels a bit during that, VDC sees the slip and backs off the throttle that you're using to hold the car steady, making things worse instead of better. I only saw this a couple times (and then went back to VDC Off always), but it was a little scary and I had to futz around with the car to get it stable again.

Limeybastard · 08-15-2014, 04:47 AM

Quote:

Originally Posted by Thechidz

that wasnt VDC that kicked in it was traction control. VDC has to do with the way the car accelerates. With it on my car revs to red line before really taking off. with it off I get a much better shift dynamic

So thats what it was. I dont normally drive hard but the few times I did it from standstill I noticed the same thing.

VABAM · 08-15-2014, 09:12 AM

njobe89 · 08-15-2014, 09:17 AM

holy old thread revival, but i dont have vdc

VABAM · 08-15-2014, 09:22 AM

Quote:

Originally Posted by njobe89

holy old thread revival, but i dont have vdc

Arrvaxx · 08-15-2014, 10:10 AM

Quote:

Originally Posted by cossie1600

The 370Z VDC is more intrusive than the one on my Prius, it is pathetic. It's not learning jack $hit other than keeping people away from cars and solid objects

What he said.

03-15-2012, 11:22 AM	#78 (permalink)
LMBmikeZ A True Z Fanatic Join Date: May 2010 Location: Ontario, Canada Posts: 12,237 Drives: 40th Rep Power: 10350	Unknown I find the rev matching is perfect in my m6 with vdc on or off makes no difference. As for between a7 vs m6 that could be a little harder to compare. As mentioned before if you modify the suspension you will have vdc kick in much more often! I found this to be true after I installed my springs and spacers. Ever since then I have been driving with it off because I find there is to much interference even with normal daily driving. It would kick in when it didn't need to at all. __________________ CUSTOM NISMO \| BERK \| H&R \| STANCE \| SPL everything \| EVO-R \| 34 Setrab \| WHITELINE \| Redline \| Carkitcompany \| Zspeed \| UpRev \| SEIBON

03-15-2012, 12:20 PM	#81 (permalink)
slo Base Member Join Date: Mar 2012 Location: denver Posts: 240 Drives: 370, TBSS, ZX10r Rep Power: 13	I think opinions will vary from driving skill, preferences, and situation. I have had the VDC kick in a couple of times and for the twisties, it was "ok", not pushing too hard. Still leaving that margin for error. But if I were doing a track day, it's a bit much for myself. I got out of AWDs (sti and 2 evos) due to being what I call a cheater car. Meaning those cars are very easy to push hard, so many electronics, the evo's with neutral (IX) and slightly rear biased (X) and every eletronic aid you could ask for. Makes novice drivers look like they are veterans at the track as long as they are willing to push the car. I feel that the 370z will not let you get that far. I don't know for sure since the car is new and I haven't been to the local race track yet so this is just my "temporary" haha $0.02. __________________ My introduction Thank you to my 2012 season motorcycle sponsors Colorado Powersports - TFOG Wheelsports - SIDI Boots - Scorpion Helmets TechSpec USA - HotBodies Racing - ASV Inventions

03-15-2012, 10:27 PM	#82 (permalink)
2011_6Spd Base Member Join Date: May 2011 Location: Orlando, FL Age: 44 Posts: 124 Drives: 2011 370z 6spd sport Rep Power: 14	Only times I've had VDC kick in is when I hadn't yet drive a few miles and warmed up the tires. Cold tires on the Z equals not much traction. __________________ 2011 Brilliant Silver 6spd w/sport pkg 2008 Silver CBR600RR

03-17-2012, 03:17 AM	#85 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Aside from the corner exit scenario, the other situation I've seen it behave badly in was holding steady throttle while turning in (after braking, but before the apex). If you're slipping the wheels a bit during that, VDC sees the slip and backs off the throttle that you're using to hold the car steady, making things worse instead of better. I only saw this a couple times (and then went back to VDC Off always), but it was a little scary and I had to futz around with the car to get it stable again. __________________ 7AT Track Car! Journal thread / Car setup details

08-15-2014, 09:12 AM	#87 (permalink)
VABAM A True Z Fanatic Join Date: May 2010 Location: No Where VA Posts: 4,003 Drives: with VDC off. Rep Power: 196	__________________ 2009 370Z Touring W/SP

03-15-2012, 10:12 AM	#77 (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	Has. Anyone tried to possibly test if when VDC is off? Maybe Rev-match works better from the paddles vs the stick or vice-versa? I know its connected into the same transmission but there is a noticeable performance between shifting on paddles vs shifting on the stick. The paddles snap much quicker. Maybe in the speed difference of gear changes may have an affect on "Rev-matching with VDC off???" I'm just sayin'. Something to explore??? Maybe? I guess I won't be testing that one out.: lol

03-15-2012, 11:30 AM	#79 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	yah, VDC on/off does not seem to change the SRV on my car either.

08-15-2014, 09:17 AM	#88 (permalink)
njobe89 A True Z Fanatic Join Date: May 2014 Location: Atlanta, GA Posts: 5,227 Drives: 2013 370z BS 6MT Rep Power: 174284	holy old thread revival, but i dont have vdc __________________ 2 plus 2 times 2 = ? ... hint, it's not 8 Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq