Guys: I am considering getting Racing Hart RS-721 wheels, 19x10.0 rear and 19x8.5 front, with Toyo 275/35/19 rear and 245/40/19 front tires. I am concerned that with the extra unsprung weight, it will adversely affect the acceleration of my G35 sedan. Offsets BTW are for the sedan.

I have an 03.5 Sedan with 5AT, Kinetix SSV intake, Stillen CAI/Ztube, Stillen Gen 2 exhaust. Since I am going from a 215/55/17 tire all around to a larger wheel and tire, will the added weight of the wheels and tires hurt my acceleration, or will the acceleration be the same as with the
stock setup? Also, have any of you noticed tramlining on the freeway or negative effects on the steering?

I would really appreciate your feedback. I am a noob on this forum and need some solid advice from those of you who have a setup similar to this. Can anyone help me out?

 

10.5" rims wont fit on the rear of a sedan. The most you can do is 10" with a +40 offset. And yes, with larger wheels and tires comes more weight. Thus affecting the performance of your car. If you dont track the car regularly i wouldnt worry about it though.
-GP-

 

Thanks bro.

 

I made a mistake about the rear size. It was 10.0, not 10.5. I changed my original post to make the correction.

 

if the difference between your OEM and aftermarket is > 4lbs each and aftermarket wheels are heavier, then you would REALLY feel it in term of acceleration! (not saying you wouldn't feel it if it is less...)
There would be more lag also when you shift gears with your heavier wheels. Basically 1 lbs difference in rims is like 4 lbs difference in your car's weight... so if the difference is 4 lbs x 4 (as in curb weight) x 4 wheels = feels like putting 64 lbs weight in your car (at least) ......just try to drive with heavier wheels for 3 months and then replace it with lighter wheels
Handling, however, is another topic....

 

Unsprung weight is a big deal. A couple pounds won't make a difference but if you go way up then you will feel it. It affects your acceleration, braking, and handling. If you get larger wheels and smaller tires that are the same overall diameter and same weight then you will be fine.

 

I installed lighter rims and felt a difference. Car felt a little bit peppier and off the line launches were better.

 

This is exactly what I was looking for. Thanks bro.

 

Nickk6: I see that you have Volk wheels in the 19" size. Are they lighter than the stock 17s that come with Sedan with sports tuned suspension?
I may end up getting a different wheel if I can find a 19" wheel that is similar in weight to the 17". Thanks for the help.

 

Thanks TTrank. I am trying to match specs as for overall diameter and revs per mile. I am thinking about going 245s all the way around. I think a 275 rear tire is simply too big for my lightly modded G.

 

I have 275/30/20 on the rear and it's just smaller than the oem 17" tire by a tiny bit.

 

I didn't feel the difference at all (on my butt dyno), but I felt the improvement in handling in the twisties immediately and the look of the wide buns can't be beat.

 

you should worry more about power loss from that without FI than from wheels

 

I know. For the time being, all I can do is envy you guys that have FI. I spent a bundle on a new intake, Stillen cold air package and Gen 2 exhaust. Now I am looking into wheels and tires. The spendometer is getting pegged. My wife's tolerance meter is at the redline right now, so I will have to fantasize about a supercharger or twin turbos.

 

but i thought samson pwns delilah