First off, hello and yes I'm new here. I am a member of G35Driver and have heard that performance wise, there is a lot of information on this forum. So far, I have read many interesting things here and there certainly is a lot of useful info (particularly on F/I and suspension). However, I have not been able to find a thread that answers my specific problem. Hopefully someone can help.

I have a 2004 G35 Coupe, and I'm getting the weirdest handling I've ever experienced in any car.

Here is the issue:

When I'm taking a long right-handed sweeping corner at higher speeds (i.e. a loop exit ramp or a 90-degree sweeping exit ramp at +40mph), my cars starts to lose traction very easily.

The SLIP light comes on and it seems that the left front tire wants to plow ahead.

However, because the VDC is applying brakes, I cannot tell if it's correcting understeer or oversteer.

Once the VDC applies the brakes, it feels like understeer but it could be correcting oversteer to begin with.

One way to know for sure is to turn is off, but that would be stupid to do that at a 60mph looping exit ramp!

Again, this ONLY happens with right turns... On left handed sweeps, the car is rock solid and I have not yet been able to break traction.

I have the following suspension setup:

• KW Variant-2 set to "Middle" both front and rear and lowered 1.2" F&R
• Hotchkis Sway bars set to "Middle" both front and rear
• GT Spec Mid-Chassis brace
• GT Spec Rear Tie brace
• SPC Rear Camber Kit (Rear camber is -1.7 and Front camber is -2)
• OEM tires front and rear (Mich PS 225/45-18 and 245/45-18) with lots of tread.

I am very concerned since this only happens on right turns and I'm not sure how to cure it or really not even sure of what is happening.

Suspension experts, please chime in. Thanks.

 

I would turn off VDC and see if it happens.

My opinion of the traction control in these cars is that it's there to prevent you from spinning, not to improve handaling performnance. I know this is not the case in some sports cars, like Porsche, BMW, etc, but I only use my VDC in the rain.

It is way to intrusive in the dry and anyone who tracks their car disables it. It is VERY scarry to take a lap with VDC on. Cutting the throttle on a corner entry can be very bad!

I would try your test without VDC and see if the problem re-creates itself. If you are not comfortable with the car on the street, than please try a auto-x or some type of legal enviroment.

 

How's your car's alignment? Tire pressure?

These are amongst the first things to check.

 

Alignment is same on FL and FR and same on RL and RR.

Pressure is the same on all fours.

 

How about the actual alignment specs? When was the last time the car got aligned?

 

Just aligned a couple of weeks ago.

-1.7 RR and RL
-2.3 FR and FL

 

Tires are manufactured to be optimized for -0.5-0.7 maximium camber static.

 

nots that the allignment number we need toe front and rear as well. Also your camber is too extream it seems, 40 seems slow, so if im pictureing the corner the way i think i am your better off going with like -1.4-1.7 F&R

 

thats somewhere in the range, the front and the rear should be the same, that works like sex on my car Although my setup is diffrent,

Stance coilovers, hotchkis sways, Camber and toe bolts rear, kinetix front a-arms, and i run-1.9 it works great at the track on street tires. I was able to lap in A group with z06's just shy of there times when they were on R-compounds.

 

i dont have VDC so I don't know what ur talking about.. mines base..
just turn it off and try... slowly build up your speed.

 

The thing I noticed is that the OP said right hand turns only. Since the swaybars and coilovers are set equal front to back it seems likely (imho) that it may be an oversteer situation.

For my driving style, I would prefer a little more sway bar in the front (go up one more notch).

You may feel more planted in the left hand turns since now your body mass is on the inside of the turn.

As some of the other posters have mentioned, turn off VDC and build up speed slowly. If you can find a big open parking lot, try building up speed while driving in a wide circle with VDC off. Clockwise will put you on the outside of the turn (your right hand turn) and you should find out fairly quickly if it is understeer or oversteer
Repeat it again but this time counter-clockwise.

Let us know what you find out...

 

Might be a faulty wheel speed sensor, I have seen this happen on a couple G coupes