HOpefully this question isn't too stupid. . .but what would be a better setup for tracking the G? as in, better handling and what not. . .

having 4, 19x8.5" rims all around with 245/35/19 rubber or. . .

having a staggered set up. . . qty 2, 18 x 8.5 for the rears with 245/45/18 rubbers and 18x7.5 for the fronts with 225/45/18 rubbers.

FYI, the 19" rims are RUff Racing aftermarket rims

The 18" rims are OEM 2004 G35 coupe rims. . .

18"rims would be lighter for sure. . .does being staggered help here?

This setup would be for my 2005 sedan 6MT. . .thanks!

 

18" coupe wheels arent staggered.. .they're 18x8 +30 all around. I'd run with the 18's since they'll be lighter.. but make sure you put some good rubber on there.
-GP-

 

really? i've been under the assumption all coupes come in staggered setup. . .taht's what i get when i only stick to the sedan forums. Reason being, someone is selling their 2004 coupe rims and said they are staggered. . .
i found this site cause i was trying to confirm the rim dimensions, and in the last paragraph the tire sizes are staggered. . .

http://www.automedia.com/2004/Infini...ts20040501gc/1

or perhaps just teh tires are staggered and the rims are the same dimensions? i'm still a little confused, but thanks for the input.

 

the wheels itself aren't staggered but the tires are

 

i've had the wheels and worked on countless G coupes with em. The wheels are all the same size. Just the tires are a 225/245 staggered setup.
-GP-

 

Got it, good to know, thanks!

 

although i believe the 05-07 OEM coupe 19's are staggered wheels AND staggered tires...19x8 in the fronts and 19x8.5 in the rear still having the 225/245 staggered tires.

 

this is true and pretty widely known.
-GP-

 

I track my JWT TT G35 on a regular basis. My previous track wheels/tires were 18x8.5 245/35 front and 18x9.5 265/35 rears. I still had some understeer on hard cornering, and power induced oversteer coming out of turns if I gave it too much throttle. These were R-Comp tires (BF Goodrich G-Force R1's)

My new set of wheels tires are the same wheels, and 255/35 front and 275/35 rear. These will be Toyo R888's, Still R-comps, but 100 UTQG, versus 40 UTQG on the R1's, which means longer life, but slightly less traction. Once I get these on, I'll do a good review of them, posted over on my350z, which has a better track/autocross section, with more info.

 

I've been competing in road racing and time attacks for over 10 years, currently racing in the Canadian Touring Car Championship in my Civic and will be doing a race or two in the SPEED World Challenge in a factory-backed Scion. One thing I've learned over the years is that front grip is king if turning the fastest possible lap time is your objective.

I've only had my G coupe at the track once since buying it back in July, running on the stock 19'' wheels and Bridgestone tires (225's front and 245's rear). Just like caelric noticed, my G exhibited a lot of initial understeer on corner entry, which I could transition to power-on oversteer from mid-corner to corner exit as a way of combating the understeer. Clearly the front tires were being overwhelmed on turn-in, which is why it was understeering so much. A car this big and heavy needs A LOT more front tire, not to mention better brakes (at a bare minimum a good aggressive track pad and upgraded brake fluid).

To eliminate the severe understeer problem, I'm going to use a non-staggered setup for the track, so that I can generate the required front grip. I can then use the throttle to control the balance of the car throughout the turn, which is of course the beauty of RWD. And the G's chassis seems very responsive and well balanced, so with enough front grip I think the car will be a real joy to drive at the track.

I'm going to try 18x10'' wheela all around (since you can't get r-compound tires in a 19'' other than Hoosiers, which are too pricy and short-lived for my taste), equipped with 265/40-18 Eagle F1 Asymmetrics to start and once I wear those out will switch to a true track tire in 275/35-18 Toyo R888's or BFG R1's. I'll let you guys know how it works out once I do some testing this spring/summer, but I'm certain a non-staggered approach will be the fast setup. Just look at the JIC S15 Time Attack car and its non-staggered setup for proof that front grip is king!

 

I'll be suprised if 275's fit up front; I would go with something that large up front, but I test fitted my old 265 rears up front, and they barely fit.

 

haha, i won't be anywhere near that wide all around, but for now, i'm def goign to stick to non-staggered set up. get that front grip, and its nice to be able to rotate tires. yea, talking to a few, it seems the best way to go at least first is just to get a good set of track pads. . . i almost went the whole new rotor/caliper etc (bbk), but will save the money instead for future mods. this year i'll get enough good feedback from tracking the G on my current set up, to see where i need to go next. . .hoorray!

 

caelric, agreed that 275's will be a tight fit up front. My buddy Sasha at SG Motorsport just put 275's on the front of his Z roadster on +15 offset Enkei RPF1's and they actually fit surprisingly well. Admittedly he needs to run a fair bit of negative camber up front to clear the fender lips, but I'm going to run more positive offset on my wheels (probably about +25 or so) plus I don't mind rolling the fender lips and running 2-3 degrees of negative camber. Gotta stuff as much rubber as I can on the car to see what works best!

 

275 isn't hard to fit at all, just need to run the right offset. BTW, here's 285's on the front of one of the local's cars http://www.my350z.com/forum/showthread.php?t=336970

 

Agreed. I have 275/35/18 (F) and 295/35/18 (R) on Enkei NT03s and stock suspension. No excessive camber settings. Fronts are 18x9.5 +27 with a 10mm spacer to clear the Brembos (effective offset of +17). Rears are 18x10.5 +30.