VDC not very intrusive?

m4a1mustang

My guess is we probably can't without assistance.

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wstar

Re manually rev-matching the 7AT:

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.

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.

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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.

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ImportConvert

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

UNKNOWN_370

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

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.

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kenchan

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

slo

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.

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2011_6Spd

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.

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spearfish25

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.

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wstar

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.

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VABAM

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njobe89

holy old thread revival, but i dont have vdc

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VABAM

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njobe89

it was disengaged

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2 plus 2 times 2 = ? ... hint, it's not 8

Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq