Tracking the G37S...18's??

Lastchance · 08-27-2009, 11:00 PM

I am thinking of going to 18's for tracking purposes. I am told there will be less rotational mass leading to faster lap times. 18's are also cheaper to replace tires.

Has anybody done this for racing purposes (I'm not inquiring on 18's for a winter set up) ?? Any input?? Thanks

Gazan37 · 08-28-2009, 03:57 AM

I say get some nice lightweight 18" rays/volks for the track.

If it was me i wouldnt keep em on for daily driving but for track would be great. Just my opinion

G37Sam · 08-28-2009, 05:31 AM

Yup definitely light weight 18s for the track I say. Light weight brake rotors too while you're at it. Stainless Steel clutch & brake lines, Transmission oil cooler there's a whole list of upgrades you'll need to do.

rossab · 08-28-2009, 03:26 PM

Don't forget the other huge advantage of smaller diameter wheels,

19 + 6 (tires) = 25
18 + 6 (tires) = 24

24 / 25 = 96%

25 * 3.14 = 78.5 * .96 = 75.36

78.5 inches per rotation versus 75.36 inches per rotation.

Basically it equates to atleast a 4% gear reduction if you use tires with similar sidewall heights.

My first PDX was at Mid-Ohio and one of the first things my instructor said about my car, was that it had really long gears. I pretty much drove the whole track in 3rd.

Also don't forget that it will bring the majority of the rotional mass (surface area of the tire) 1 inch closer to the axis by radius. The larger the distance from the axis, the more the weight will affect the rotational inertia.

***I don't claim to be a physicist, I'm going by what I've been told

Gazan37 · 08-28-2009, 05:03 PM

Daym never would've put that much thought into it. Just figured smaller wheels= lighter weight= easier rotation, better grip, better steering response and pickup

Just the dumbed down version of what rossab said lol

Lastchance · 08-30-2009, 02:29 AM

Sounds Good...thanks...Has anybody with a sport model found some lighter weight 18's that fit properly??

Stoof@180Custom · 08-30-2009, 02:35 AM

you can get the 350z anniversary 18s

Gazan37 · 08-31-2009, 12:27 AM

I would think any 18" rays or volks that fit the z should b fine with the right spacers/offsets

TJHG37S · 08-31-2009, 02:20 AM

Might want to look into Rota wheels as well, they're lightweight and cheap, perfect for track. Huge in the Subaru and Evo crowd.

Mike · 08-31-2009, 12:15 PM

RPF1's. 18x8.5 and 18x9.5

Lightweight and cheap

08-27-2009, 11:00 PM	#1
Lastchance Registered User Trader Score: (0) Join Date: Oct 2007 Location: San Bernarino, CA Posts: 357	Tracking the G37S...18's?? I am thinking of going to 18's for tracking purposes. I am told there will be less rotational mass leading to faster lap times. 18's are also cheaper to replace tires. Has anybody done this for racing purposes (I'm not inquiring on 18's for a winter set up) ?? Any input?? Thanks __________________ KILL BILL

08-28-2009, 03:57 AM	#2
Gazan37 Registered User Trader Score: (0) Join Date: Jul 2008 Location: G-Dale, CA Posts: 877	I say get some nice lightweight 18" rays/volks for the track. If it was me i wouldnt keep em on for daily driving but for track would be great. Just my opinion __________________ 08 LP G37S/5% & 25% Tints/ LEDs/ valenced/ Midnight Grill/ Stillen Gen 3/ Eibach

08-28-2009, 05:31 AM	#3
G37Sam Administrator 2008 Infiniti G37 Trader Score: (0) Join Date: Aug 2008 Location: UAE Posts: 6,613	Yup definitely light weight 18s for the track I say. Light weight brake rotors too while you're at it. Stainless Steel clutch & brake lines, Transmission oil cooler there's a whole list of upgrades you'll need to do. __________________ '08 AG G37S 5AT \| Fully Loaded \| Tint \| Clear Bra \| FI CF Catback \| PC Rims \| BB's V2 GK \| Eibach Pro Kit \| Painted Grille \| 4x20mm H&R Spacers \| Stillen 3rd Gen Intakes \| FI Non-Res Test Pipes \| Customized Fox Resonators \| FR:245/40 RR:275/35 \| UR Crank Pulley \| PIAA Fogs \| Debadged & Valenced \| Painted Headlights Before you post: - Check out this lovely feature! - Read our Guidelines - Read the forum rules - Learn how to post Getting lost in this place? \| Want to become premier? \| Want to mod but don't know where to start? \| Need specs of OEM wheels? \| Got G? Check In! \| We know what a G looks like, what do you look like? \| Classic post? Post it up

08-28-2009, 03:26 PM	#4
rossab Registered User Trader Score: (2) Join Date: Jul 2008 Location: Cincy, OH Posts: 147	Don't forget the other huge advantage of smaller diameter wheels, 19 + 6 (tires) = 25 18 + 6 (tires) = 24 24 / 25 = 96% 25 * 3.14 = 78.5 * .96 = 75.36 78.5 inches per rotation versus 75.36 inches per rotation. Basically it equates to atleast a 4% gear reduction if you use tires with similar sidewall heights. My first PDX was at Mid-Ohio and one of the first things my instructor said about my car, was that it had really long gears. I pretty much drove the whole track in 3rd. Also don't forget that it will bring the majority of the rotional mass (surface area of the tire) 1 inch closer to the axis by radius. The larger the distance from the axis, the more the weight will affect the rotational inertia. **I don't claim to be a physicist, I'm going by what I've been told __________________ http://myg37.com/forums/wtb-want-to-buy/204313-wtb-a-lot-of-stuff-serious-buyer.html Last edited by rossab; 08-28-2009 at 03:37 PM.*

08-28-2009, 05:03 PM	#5
Gazan37 Registered User Trader Score: (0) Join Date: Jul 2008 Location: G-Dale, CA Posts: 877	Daym never would've put that much thought into it. Just figured smaller wheels= lighter weight= easier rotation, better grip, better steering response and pickup Just the dumbed down version of what rossab said lol __________________ 08 LP G37S/5% & 25% Tints/ LEDs/ valenced/ Midnight Grill/ Stillen Gen 3/ Eibach

08-30-2009, 02:29 AM	#6
Lastchance Registered User Trader Score: (0) Join Date: Oct 2007 Location: San Bernarino, CA Posts: 357	Sounds Good...thanks...Has anybody with a sport model found some lighter weight 18's that fit properly?? __________________ KILL BILL

08-30-2009, 02:35 AM	#7
Stoof@180Custom MYG37.COM Sponsor 2008 Infiniti G37 Trader Score: (1) Join Date: Mar 2007 Location: Staten Island, NY Posts: 2,011	you can get the 350z anniversary 18s __________________ ON VACATION G37NYC~180°~Iforged~Mastergrade~Seibon~Injen~Berk~ HKS~JIC~Hotchkis~GTSpec~Stoptech~

08-31-2009, 12:27 AM	#8
Gazan37 Registered User Trader Score: (0) Join Date: Jul 2008 Location: G-Dale, CA Posts: 877	I would think any 18" rays or volks that fit the z should b fine with the right spacers/offsets __________________ 08 LP G37S/5% & 25% Tints/ LEDs/ valenced/ Midnight Grill/ Stillen Gen 3/ Eibach

08-31-2009, 02:20 AM	#9
TJHG37S LA G Club Trader Score: (10) Join Date: Feb 2009 Location: L.A. Posts: 2,759	Might want to look into Rota wheels as well, they're lightweight and cheap, perfect for track. Huge in the Subaru and Evo crowd. __________________ 08 G37S VR/Graphite - Team LA:G's \| Los Angeles G's (Infiniti G37)

08-31-2009, 12:15 PM	#10
Mike Registered User Trader Score: (0) Join Date: Feb 2008 Posts: 1,975	RPF1's. 18x8.5 and 18x9.5 Lightweight and cheap

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