VDC tried to kill me!
06-04-2007, 08:46 AM
#101
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Originally Posted by Spike100
Please forgive the "newbie" question, but since VDC is set to a staggered front to rear overall diameter... Why not install front to rear tires with overall diameter that match VDC's requirements?
--Spike
--Spike
A non staggered setup will allow for a more neutral car in corners. And the difference is very noticeable. VDC does not act up 99.9999998 percent of the time with a square setup. But it did, in fact, act up this one time. I just turn the thing off right now.
06-04-2007, 10:54 AM
#102
Originally Posted by Tubbs
A non staggered setup will allow for a more neutral car in corners. And the difference is very noticeable. VDC does not act up 99.9999998 percent of the time with a square setup. But it did, in fact, act up this one time. I just turn the thing off right now.
Not the same type of stagger...
06-04-2007, 11:01 AM
#103
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Originally Posted by Kolia
Spike is talking about the tire diameter while you are thinking of the contact patch width.
Not the same type of stagger...
Not the same type of stagger...
oops
sorry spike... my bad.
06-04-2007, 07:06 PM
#104
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Originally Posted by Tubbs
oops sorry spike... my bad.
sorry spike... my bad.
Kolia does describe my comments accurately. I was in fact referring to overall diameter (and not tire width) when I asked about using a staggered tire setup with VDC.
You started a very good thread. Anytime your thread attracts the attention of DavesZ#3 (a moderator on the Forum) or Kolia (or both on this/your Thread); you can be sure the Thread is of interest to the Z community. These guys consistently post accurate and useful information. I am grateful for their participation.
...Back to your original report and your Thread, and the advice posted by members on the Forum. Here is what I believe are some important points about VDC:
1) To be safe when running under VDC, you should maintain OEM overall diameter on your wheels/tires setup. Nissan recommends 225/45-18 front and 245/45-18 rear OEM (on models previous to the 2007 Grand Touring model which has 18" wheels on the front and 19" wheels on the rear, but also "respects" overall diameter front to rear) or the Nismo setup 245/40-18 front and 275/40-18 rear (along with Nismo sway bars and suspension, which may not be necessary).
2) You can run 17, 18, 19, or 20 inch wheels with VDC using appropriate tires as long as you maintain the OEM overall diameter measurement front to rear.
3) If you run the same overall diameter tires front-to-rear (ignoring Nissan's requirement running staggered overall diameter front-to-rear), VDC may not work as expected. Your report/experience on your/this Thread confirms this. Other people posting on this/your Thread also report similar experiences.
4) Running a staggered overall diameter front to rear, but running a non-staggered tire width probably has no effect on VDC function. I say this because I am running 245/40-18 front and 245/45-18 rear and also keep VDC on, and I have no problems with this setup. But, my experience is just that (one case) and is not statistically significant.
5) As Kolia points out: Any tests you do on new tires might be flawed since new tires drive/handle very differently until after the initial "break-in."
--Spike
06-04-2007, 09:15 PM
#105
Great that your are finding the limits of your Z!!!! I usually turn if the traction control on track days, this is to see what I am capable of doing without aid. If the brakes lock up as you stated you must not be driving a Z they have ABS, the computer pulses the brakes so that the car will stop in a controlled straight line. Yes this sounds like DRIVER ERROr, yes I too almost rolled my Z in the first week that I had it also, not being familiar with ABS braking and the car it get some push on roads from time to time. Chalk this 1 up to learning about your car, I usually put my foot into the pedal when the back end feels loose, it seems to bring the car back into control. And your buddy behind you on the bike glad to see that he didn't hit your A$$, gue
ss he was praying and hoping that you didn't end the game for the 2 of you.
ss he was praying and hoping that you didn't end the game for the 2 of you.
Originally Posted by Tubbs
I've never been a huge fan of electronic gizmos in control of my car, but forget to turn it off sometimes, anyways I was doing a bit of spirited driving (probably 8/10's) on a twisty road. I was doing about 80 mph on a dry road. I braked before an oncoming corner, rode the long and tight sweeper, when about half way through my rear brakes locked up, and the fuel was cut. (you know... what you DON'T want in a corner). My rear starts to fly out, and I had to do some serious quick steering manuevers to get that biatch straightened up. The Slip lighht was on throughout, then turned off. I checked the road... there was nothing on it. I got back in, scared shiatless, and continued on (with VDC off). I haven't had problems sice... but what the hell happened???
06-04-2007, 10:13 PM
#107
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Originally Posted by Korki Buchek
Spike --
Have you found that running a "square" setup -- i.e. same tire width -- has made handling more neutral?
Have you found that running a "square" setup -- i.e. same tire width -- has made handling more neutral?
I'm running Goodyear Eagle F1 GS-D3 (145/40-18 front and 145/45-18 rear). Handling is noticeably more neutral. I can hit a corner hard and begin accelerating out (pretty much full power) sooner then I ever would attempt with the OEM tires.
--Spike
Last edited by Spike100; 06-04-2007 at 10:17 PM.
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