why 18'' wheels more popular on track?

synolimit · 01-26-2014, 07:37 PM

Quote:

Originally Posted by roplusbee

I actually learned something in this thread. Thanks guys!

Not feeling the tape, but it seems to be a valid means of NOT losing your wheel weights. It just makes me think that it will look silly, lol.

If the weights are on the inside you'll never see it. If you're tracking your car it's not for show, it's for go. No one cares about looks. Most tape also comes in colors so it will be kinda hidden. My fronts are plasti dipped so I should be ok since a thick layer of rubber is holding them on, also another option.

roplusbee · 01-26-2014, 08:11 PM

True!

Chuck33079 · 01-26-2014, 10:21 PM

They run inboard brakes, don't they?

Sh0velMan · 01-27-2014, 07:43 AM

No sir.

Sh0velMan · 01-27-2014, 07:45 AM

Teams run bigger wheels to fit bigger brakes, period. F1 gets away with a 16-17inch wheel it because they have the most potent friction materials available, bar none, plus the most aggressive cooling systems, and their cars are around 1200-1400 pounds fully loaded.

wstar · 01-27-2014, 08:39 AM

During one of our advanced classroom sessions at the track this weekend, the instructor (who seemed quite experienced) had a detailed discussion with us about all things related to tires and rubber and widths and heights and tradeoffs. I'm still digesting half of what he said, and there's no way I could repeat it all anyways, but suffice it to say I came away from the discussion still thinking that 18x10 square is best for this car in the overall. You could potentially see some very small benefit from going wider (at least in the rear), but only if there's another reason for the tradeoff (e.g. to use up leftover points because you were under expected weight for your class or something) - although I'd rather buy aero than wider wheels, I think, in situations where that's an option.

synolimit · 01-29-2014, 02:54 AM

Good to know. Selling 9.5 and 10.5 now to get 10" square with 285/35 or 295/30 or 295/35 if they make something I can afford.

Masterbeatty · 01-29-2014, 06:49 AM

Quote:

Originally Posted by synolimit

Good to know. Selling 9.5 and 10.5 now to get 10" square with 285/35 or 295/30 or 295/35 if they make something I can afford.

Check out A.M. Brian's offer. That is what he is trying to do is make them affordable. That's why I am waiting to see what happens with those. Races don't start in CT till end of March anyway so I have some time.

synolimit · 01-29-2014, 06:55 AM

Quote:

Originally Posted by Masterbeatty

Check out A.M. Brian's offer. That is what he is trying to do is make them affordable. That's why I am waiting to see what happens with those. Races don't start in CT till end of March anyway so I have some time.

Not sure I follow. He's making a tire or something? Is there a post?

SPOHN · 01-29-2014, 05:25 AM

I run square size tires but my wheels are a inch apart. Until I come a cross another set of just two 9.5 width or 10.5 RPF1's I can more than live with it for now.

synolimit · 01-29-2014, 05:57 AM

Ill sell you either or spohn.

carlitos_370z · 01-29-2014, 06:37 AM

nice info guys!!!

wstar · 01-29-2014, 09:11 AM

The thread is here: New/Better Wheel Option for Spec Z . He's making an 18x10 square set for the SpecZ crowd, and the offsets look good for us too on paper.

FWIW, my current square setup (that works and doesn't rub, with the APRacing BBK and the car lowered an inch or two on my coilovers) is Forgestar F-14 18x10 +34 all around, and using a 10mm spacer (the type that's just a plate with holes in it, from Z1) in the rear so they come out a little closer to the fender back there, with 275/35R18 rubber on them (RS3). I got the offset info from travisjb + Mike who have both run a similar setup at some point in the past. The upside of same-offset all around on the wheels themselves is you can rotate wheels between all 4 corners and flip tires on the wheels, etc. Less waste on un-rotate-able tires.

As I mentioned in Brian's thread, I think the offsets he's putting on his SpecZ setup will end up ~5mm further out than mine, so it's in the ballpark and will work, although who knows yet on brake fitment and whether you'd want a little spacer in the rear for looks.

synolimit · 01-29-2014, 09:18 AM

O I only care about tires. At the moment it looks like 285/35 RS3 or 295/30 R888.

I plan on rpf1 in 18x10 +38. Right now I have 18x9.5 +45 (w/ 20mm) and 18x10.5 +15. To me they stick out a little to much. Maybe 1/4" past the fenders. The new rpf1's will suck in 7mm front and 9mm rear by me moving the 20mm spacer from the front to the rear.

Not 100% if the front will fit, if it doesn't then a 5mm spacer should do it I hope.

cossie1600 · 01-29-2014, 12:22 PM

285 35 18 is too small, it's annoying to rub everywhere

01-26-2014, 08:11 PM	#2 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 24	True! __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

01-26-2014, 10:21 PM	#3 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29540	They run inboard brakes, don't they? __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

01-27-2014, 07:43 AM	#4 (permalink)
Sh0velMan A True Z Fanatic Join Date: Jan 2012 Location: Dallas/Ft.Worth Posts: 3,349 Drives: Noisily. Rep Power: 22	No sir. __________________ Buy My Car! \| Build Thread

01-27-2014, 07:45 AM	#5 (permalink)
Sh0velMan A True Z Fanatic Join Date: Jan 2012 Location: Dallas/Ft.Worth Posts: 3,349 Drives: Noisily. Rep Power: 22	Teams run bigger wheels to fit bigger brakes, period. F1 gets away with a 16-17inch wheel it because they have the most potent friction materials available, bar none, plus the most aggressive cooling systems, and their cars are around 1200-1400 pounds fully loaded. __________________ Buy My Car! \| Build Thread

01-27-2014, 08:39 AM	#6 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	During one of our advanced classroom sessions at the track this weekend, the instructor (who seemed quite experienced) had a detailed discussion with us about all things related to tires and rubber and widths and heights and tradeoffs. I'm still digesting half of what he said, and there's no way I could repeat it all anyways, but suffice it to say I came away from the discussion still thinking that 18x10 square is best for this car in the overall. You could potentially see some very small benefit from going wider (at least in the rear), but only if there's another reason for the tradeoff (e.g. to use up leftover points because you were under expected weight for your class or something) - although I'd rather buy aero than wider wheels, I think, in situations where that's an option. __________________ 7AT Track Car! Journal thread / Car setup details

01-29-2014, 02:54 AM	#7 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3391	Good to know. Selling 9.5 and 10.5 now to get 10" square with 285/35 or 295/30 or 295/35 if they make something I can afford. __________________ 13 370z-

01-29-2014, 05:25 AM	#10 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 47 Posts: 14,844 Drives: Waiting on next Z Rep Power: 223	I run square size tires but my wheels are a inch apart. Until I come a cross another set of just two 9.5 width or 10.5 RPF1's I can more than live with it for now. __________________

01-29-2014, 05:57 AM	#11 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3391	Ill sell you either or spohn. __________________ 13 370z-

01-29-2014, 06:37 AM	#12 (permalink)
carlitos_370z A True Z Fanatic Join Date: Jul 2013 Location: Puerto Rico Posts: 7,157 Drives: 13 Nissan 370Z SP M6 Rep Power: 7587	nice info guys!!!

01-29-2014, 09:11 AM	#13 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	The thread is here: New/Better Wheel Option for Spec Z . He's making an 18x10 square set for the SpecZ crowd, and the offsets look good for us too on paper. FWIW, my current square setup (that works and doesn't rub, with the APRacing BBK and the car lowered an inch or two on my coilovers) is Forgestar F-14 18x10 +34 all around, and using a 10mm spacer (the type that's just a plate with holes in it, from Z1) in the rear so they come out a little closer to the fender back there, with 275/35R18 rubber on them (RS3). I got the offset info from travisjb + Mike who have both run a similar setup at some point in the past. The upside of same-offset all around on the wheels themselves is you can rotate wheels between all 4 corners and flip tires on the wheels, etc. Less waste on un-rotate-able tires. As I mentioned in Brian's thread, I think the offsets he's putting on his SpecZ setup will end up ~5mm further out than mine, so it's in the ballpark and will work, although who knows yet on brake fitment and whether you'd want a little spacer in the rear for looks. __________________ 7AT Track Car! Journal thread / Car setup details

01-29-2014, 09:18 AM	#14 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3391	O I only care about tires. At the moment it looks like 285/35 RS3 or 295/30 R888. I plan on rpf1 in 18x10 +38. Right now I have 18x9.5 +45 (w/ 20mm) and 18x10.5 +15. To me they stick out a little to much. Maybe 1/4" past the fenders. The new rpf1's will suck in 7mm front and 9mm rear by me moving the 20mm spacer from the front to the rear. Not 100% if the front will fit, if it doesn't then a 5mm spacer should do it I hope. __________________ 13 370z- Last edited by synolimit; 01-29-2014 at 09:21 AM.

01-29-2014, 12:22 PM	#15 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 32	285 35 18 is too small, it's annoying to rub everywhere

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