18's on a 370z

NorthStyle · 12-13-2017, 05:22 AM

I'd move the proposed rears (18x9.5 et15) to the front and get 18x10.5 et15 for the rears

carlitos_370z · 12-13-2017, 05:53 AM

Quote:

Originally Posted by NorthStyle

I'd move the proposed rears (18x9.5 et15) to the front and get 18x10.5 et15 for the rears

Zcutty69 · 12-30-2017, 02:32 PM

So I've been pondering the idea of switching to 18"s. Mainly rpf1s 18x9.5/10.5 +15 or possibly other 18"s with comparable weight and price. I'm Currently on oem sport rays square rear setup 19x10 +30 (275/35/19). My question is are there any significant performance benefits of doing this ? If switching to a 18" wheel I would want to run a taller tire. 40 series at least. 18 pound fronts/19 pound rears (rpf1s) vs 23.8 pound wheels I'm currently running (oem sport rays) . Is reducing unsprung weight as important for say highway pulls and spirited canyon driving ?

TN.Z · 12-31-2017, 06:25 PM

Quote:

Originally Posted by Zcutty69

So I've been pondering the idea of switching to 18"s. Mainly rpf1s 18x9.5/10.5 +15 or possibly other 18"s with comparable weight and price. I'm Currently on oem sport rays square rear setup 19x10 +30 (275/35/19). My question is are there any significant performance benefits of doing this ? If switching to a 18" wheel I would want to run a taller tire. 40 series at least. 18 pound fronts/19 pound rears (rpf1s) vs 23.8 pound wheels I'm currently running (oem sport rays) . Is reducing unsprung weight as important for say highway pulls and spirited canyon driving ?

Reducing unsprung weight is important everywhere but as I recall the effects will be noticed most in low RPMs. But you are lightening the drivetrain you will feel faster response to inputs. I’d say it will help highway pulls but it will help canyon roads the most.

Either way you are reducing wheel sure but make sure you look at weights with tires. You are increasing tire and they weigh just as much as wheels in most cases. Don’t pick heavy tires for your light new wheels or you will just be wasting time.

Zcutty69 · 12-31-2017, 07:02 PM

Quote:

Originally Posted by TN.Z

Reducing unsprung weight is important everywhere but as I recall the effects will be noticed most in low RPMs. But you are lightening the drivetrain you will feel faster response to inputs. I’d say it will help highway pulls but it will help canyon roads the most.

Either way you are reducing wheel sure but make sure you look at weights with tires. You are increasing tire and they weigh just as much as wheels in most cases. Don’t pick heavy tires for your light new wheels or you will just be wasting time.

Thanks for the input. This is exactly what I was thinking when I said I would want to go up to a 40 series tire if I go 18s. Light wheels but taller, heavier tires might negate the weight savings of going with a smaller, lighter wheel. Decisions decisions.. Anyone here have experience with the more affordable side of summer tires? Like Toyo proxies or federal rsrr's?

Hotrodz · 12-31-2017, 09:35 PM

It is all about how far you want to chase that rabbit down its hole. You can buy two piece light weight rotor and reduce unsprung weight even more to negate the weight of the tire. Depending on what you are looking for if you go with a smaller diameter tire like a 295 or a 315 it will effective have the same effect as changing your gear ratio and the car will accelerate faster in short runs which is what you want for tracking and canyon runs.

cigarclifford · 12-31-2017, 09:38 PM

Quote:

Originally Posted by Hotrodz

It is all about how far you want to chase that rabbit down its hole. You can buy two piece light weight rotor and reduce unsprung weight even more to negate the weight of the tire. Depending on what you are looking for if you go with a smaller diameter tire like a 295 or a 315 it will effective have the same effect as changing your gear ratio and the car will accelerate faster in short runs which is what you want for tracking and canyon runs.

Zcutty69 · 12-31-2017, 10:41 PM

Quote:

Originally Posted by Hotrodz

It is all about how far you want to chase that rabbit down its hole. You can buy two piece light weight rotor and reduce unsprung weight even more to negate the weight of the tire. Depending on what you are looking for if you go with a smaller diameter tire like a 295 or a 315 it will effective have the same effect as changing your gear ratio and the car will accelerate faster in short runs which is what you want for tracking and canyon runs.

True. Also should have mentioned i have 4.08 gears ready to install. And I will eventually add lightweight rotors a little later down the road. Did some quick calculations on willtheyfit.com and a 305/35/18 has a diameter of 670.7mm vs 675mm for my 275/35/19 I'm currently running. More rubber and comparable diameter sounds good to me ? That and a summer 18" tire is probably lighter then my current 19" all season tire lol. Guess I'll start my search for a set of rpf1s.

jchammond · 01-01-2018, 12:29 AM

HotRodz Know's all about the "Rabbit-Hole"

jchammond · 01-01-2018, 12:33 AM

Being a 18's thread,,,Had to order a set of A/S's for my base wheel's-Cold weather sneaked up on me.
245/45,275/40/18's A/S 3+'s.

TN.Z · 01-01-2018, 07:35 AM

Quote:

Originally Posted by jchammond

Being a 18's thread,,,Had to order a set of A/S's for my base wheel's-Cold weather sneaked up on me.
245/45,275/40/18's A/S 3+'s.

I am liking my A/S 3+ so far. I’d love to hear a second opinion on them when you get some miles on them.

jchammond · 01-04-2018, 07:25 PM

Quote:

Originally Posted by TN.Z

I am liking my A/S 3+ so far. I’d love to hear a second opinion on them when you get some miles on them.

Changed up on my sizes to 225/50,255/45’s....wanted to stay closer to 27”.
Gonna behave at low speeds/ as these will be quicker than them fat summer tires!

Sent from my iPhone using Tapatalk

jchammond · 01-09-2018, 05:54 AM

Quote:

Originally Posted by TN.Z

I am liking my A/S 3+ so far. I’d love to hear a second opinion on them when you get some miles on them.

Ride quality,handling,road noise,etc... Excellent; couldn’t have made a better decision on tire.
As these were installed for cold weather use.
I’m not gonna “Roast” the tread from these & hopefully get a few winters of driving out of them....they sure are narrow vs. 285/35,345/30/19’s,,,but are put on for serving a purpose & are doing well.

OptionZero · 01-05-2018, 12:23 PM

There's only 1 way to pull off 18's on the Z34 wheel arches:

Full track setup (@TonyZ34)

everything else looks sad to me. even the stock nismos come with 19's

Eagle · 01-05-2018, 12:54 PM

Quote:

Originally Posted by OptionZero

There's only 1 way to pull off 18's on the Z34 wheel arches:

Full track setup (@TonyZ34)

everything else looks sad to me. even the stock nismos come with 19's

You can certainly hit the track with Tony's old setup from 2016 as referenced in the picture, but i'd be hesitant to call it a "full track setup".

Also regarding 19's on a track car, most grassroots racers try to stay away from anything larger than 18's for the following reasons...

More limited tire choices than 18's
Cost of tires and wheels
Cannot rotate tires with the stagger of most 19's
Weight
Did i say cost?
Oh yeah and cost

12-31-2017, 09:35 PM	#6 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684386	It is all about how far you want to chase that rabbit down its hole. You can buy two piece light weight rotor and reduce unsprung weight even more to negate the weight of the tire. Depending on what you are looking for if you go with a smaller diameter tire like a 295 or a 315 it will effective have the same effect as changing your gear ratio and the car will accelerate faster in short runs which is what you want for tracking and canyon runs. __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

01-01-2018, 12:29 AM	#9 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	HotRodz Know's all about the "Rabbit-Hole" __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

01-01-2018, 12:33 AM	#10 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	Being a 18's thread,,,Had to order a set of A/S's for my base wheel's-Cold weather sneaked up on me. 245/45,275/40/18's A/S 3+'s. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

01-05-2018, 12:23 PM	#14 (permalink)
OptionZero A True Z Fanatic Join Date: Apr 2011 Location: Sacramento Posts: 3,270 Drives: 15 370Z Nismo 6MT Rep Power: 214101	There's only 1 way to pull off 18's on the Z34 wheel arches: Full track setup (@TonyZ34) everything else looks sad to me. even the stock nismos come with 19's __________________ OptionZero Build Thread

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12-13-2017, 05:22 AM	#1 (permalink)
NorthStyle A True Z Fanatic Join Date: Aug 2015 Location: Deutschland + SC/FL USA Posts: 1,309 Drives: 2011 370Z Nismo Rep Power: 24278	I'd move the proposed rears (18x9.5 et15) to the front and get 18x10.5 et15 for the rears

12-30-2017, 02:32 PM	#3 (permalink)
Zcutty69 Enthusiast Member Join Date: Apr 2016 Location: NC Posts: 251 Drives: 13' Base Sport M6 Rep Power: 26	So I've been pondering the idea of switching to 18"s. Mainly rpf1s 18x9.5/10.5 +15 or possibly other 18"s with comparable weight and price. I'm Currently on oem sport rays square rear setup 19x10 +30 (275/35/19). My question is are there any significant performance benefits of doing this ? If switching to a 18" wheel I would want to run a taller tire. 40 series at least. 18 pound fronts/19 pound rears (rpf1s) vs 23.8 pound wheels I'm currently running (oem sport rays) . Is reducing unsprung weight as important for say highway pulls and spirited canyon driving ?