im wondering if having this setup triggered my VCD. i think it was my VCD but i cannot verify. i was coming up a right ramp turn and i did it kinda tight as i was turning i heard a braking noise in my front left tire. if the problem is the front tire i have no issue replacing it, i just figured id run it low before doing new fronts.

my tire set up which was going to be a temp because i didnt wanna buy new fronts, so only bought rears, this is currently my set up

Front: 225/50/18
Rear: 245/45/18

could having the higher tire on my rims affect it?

 

No.
You are only about 1.75% larger than stock and the front/rear ratio is only about .7% difference. it's not the overall diameter, but the the F/R ratio difference that would affect the VDC.

Not sure what you mean by "as i was turning i heard a braking noise in my front left tire" the VDC cuts power output to reduce/prevent wheel spin.

 

it seems like the front left tire braked... it seem like there was a pull in the tire.i i guess to reduce the speed of it.

 

VDC doesnt cut power (brake) to each wheel indepndently. The power to the wheels (S) is cut evenly at the engine. It it would be like your clutch slipping severely, the car feels as though it lost 50% power to reduce slip.

 

VDC actually reduces power output AND brakes separate wheels, so you most likely took the turn a little too vigorously and understeered which caused the VDC to actuate the left front brake and put you on the correct path. VDC only cutting power is NOT TRUE.

 

Was unaware.

 

Nah it's cool. It's more than a simple TCS system which just cuts power. Alot of cars have them now. It's like TCS and Stability Management all wrapped into one.

This past winter I hit an icey overpass while coming to a stop before getting on the interstate. Saved my butt by keeping the car heading straight. Could feel it try to slip out side to side, but it kept it heading straight forward.

 

it felt like it was braking.. but would be like in pauses and heavy, did slow down

 

i dont know about you guys but i only notice the vdc working for oversteer. I dont really feel/notice any help with understeer.

 

You should probably lay off the throttle haha.

Here's a good explanation I found of how VDC works.


http://victorianissanblog.com/2009/1...vdc-explained/

 

^
good write-up.

I think the effects of the vdc with understeer does not seem like much because when you understeer your natural reaction would be to take your foot off the throttle therefore slowing the car and eventually regaining grip so when the vdc applies the brakes the effects are not as great but with oversteer if trying to whip the car generally i am pounding the throttle so when the brakes are applied and the power from the engine is reduced the effects are very noticeable