Enkei RPF1's in 18 x 8.5 +30. I dropped about 13 pounds per corner going with these...



I went with 245/45/18 Hankook V12's.



The butt dyno is pleased...

 

Put those 4 corners on a serious diet, very nice indeed. Black window trim would finish it off nicely. Nice job!

 

aaah finally Macs, glad your butt like those new wheels. Now you got me seriously thinking about these RPF1s. Hows the clearance with the bbk?

 

I've been seriously thinking about blacking all the chrome.

Cleared it, no problem at all. These are a +30 offset, whereas the Vossens were +32. Since these are only 8.5 wide instead of 9, they sit almost exactly the same. Very flush with the well. I need to drop the fronts just a touch... easy fix (couple twists on each side).

 

Hey Macs, how much do the OEM wheels weight?

I think I might just go with the G35 OEM rays instead of the G37 coupe rims. G37 rims definitely looks better on our car but they are significantly heavier than the rays. I heard shedding 5 lbs of rotational weight is like shedding 40 lbs of actual weight on the car.

 

The stock wheels on the LE sedan were 26 front and 27+ in the back.

I'm not certain of the actual sprung v unsprung weight formula, but the Enkei website says 1 pound is equal to 20.

 

Niiiice. What performance differences can you confidently say you feel?

 

Very nice. 18.3lbs per wheel? Looks great.

Did you do 18x8.5 all around?

Edit: Out of curiosity, why Hankook V12's? Wouldn't Michelin PSS drop another 3lbs or so?

 

Acceleration from a dead stop is improved. Acceleration at freeway speeds is also improved. I just filled the tank yeterday, so I'll get back to you on the MPG, but I am expecting an improvement.

I did keep the same size all around to facilitate rotation.

I went with the Hankooks because A: I had them on the car before and loved them aside from the fact they wore out too fast (16k miles - done) B: They are much less expensive than the Michelin PSS, and rated #2 behind the PSS in a test that was done by one of the car mags (can't remember which one).

Edit: After doing a little research, the PSS might be worth the extra coin, as they are 3 lbs lighter and have a 30k treadlife warranty, whereas the Hankook's have nada. If I go through these in 16k again, I WILL switch to the PSS.

 

Found it: It was Car and Driver. Here is the link...
Tire Test: Nine Affordable Summer Tires Take On the Michelin PS2 Comparison Tests - Page 10 - Car and Driver

 

I also use the Enkei RPF-1 in NASA and SCCA road racing. It's a great lightweight alloy wheel, but needs a hub spacer to get it to fit properly. You don't want the lugs to supply both the clamping force and load bearing properties. I assume the OP used some aftermarket 3 mm hub rings to get the RPF-1 to work properly on the G37.

 

Yes, hub rings came with the wheels when I ordered them. So did the lug nuts and socket.

 

That's a 3 year old review that compared tires against the old Michelin Pilot PS2, not the contemporary Pilot Super Sports (PSS). Similar tires, but still different models.

Just saying.

I respect the priority of lightweight rims... good for you. Those Enkie's seem to have a good reputation. I just wish they were more attractive. At least your BBK makes up for it in the looks department.

 

Ahhh, didn't realize the article was so dated. Still... a pretty impressive showing by the V12.

Like I said, the PSS have a 30k warranty when most summer tires don't. That may be worth the premium in itself.

 

What about bump compliance and general handling... Notice anything there?