Got a track related question? I'll try to answer. - Page 95 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

becauseracecar1 · 05-27-2014, 02:36 PM

Nitrogen vs regular air in the tires for track day? Thanks!!

Sent from my iPhone using Tapatalk

ayau · 05-27-2014, 02:43 PM

Quote:

Originally Posted by becauseracecar1

Nitrogen vs regular air in the tires for track day? Thanks!!

Sent from my iPhone using Tapatalk

Unless you can get nitrogen for free, I'd just use regular air and bleed as necessary. We're not professional racecar drivers here, lol.

7thgear · 05-27-2014, 02:48 PM

Quote:

Originally Posted by becauseracecar1

Nitrogen vs regular air in the tires for track day? Thanks!!

do you have the ability to completely suction/cycle out the regular air and then refill with only nitrogen.. and then have support for a nitrogen refill?

kinda pointless for the everyday joe

CSG David · 05-27-2014, 02:54 PM

Quote:

Originally Posted by becauseracecar1

Nitrogen vs regular air in the tires for track day? Thanks!!

Sent from my iPhone using Tapatalk

You should just buy a good tire pressure gauge and a good bicycle pump.

ZDan · 05-27-2014, 03:12 PM

Quote:

Originally Posted by CSG Mike

Assuming motion ratios of 0.95 front, and 0.75 rear, look at this ratio:

Front effective spring = 550
Rear effective spring = 500 * 0.75 = 375
Front effective spring % = 59.45
Rear effective spring % = 40.54

Keep in mind that motion ratio in the rear is probably lower than 0.75, so my numbers are off.

Actually, it's worse than that.
Wheel rate is spring rate multiplied by the SQUARE of the motion ratio, so his wheel rates are:
550 lb/in * .95^2 = 496 lb/in front wheel rate
500 lb/in * .75^2 = 281 lb/in rear wheel rate

I'd swap the springs front to rear to get:
500*.95^2 = 451 lb/in front wheel rate
550*.75^2 = 309 lb/in rear wheel rate

And probably reconnect the rear sway, but then more likely to lift the inside rear...

How on earth did this car end up with 57/43 weight distribution?

CSG Mike · 05-27-2014, 03:13 PM

Multiple posts got combined into one post there.. >>,

dradernh · 05-27-2014, 04:47 PM

Quote:

Originally Posted by CSG David

You should just buy a good tire pressure gauge and a good bicycle pump.

Every track rat should have one of each. Bike pumps can come in very handy!

CSG David · 05-27-2014, 04:50 PM

Quote:

Originally Posted by dradernh

Every track rat should have one of each. Bike pumps can come in very handy!

Everybody laughs at me for bringing a bike pump. I'm also the guy everybody asks to borrow the bike pump to pump up their tires after the track day.

See. I solved the obesity problem already.

jvincent · 05-27-2014, 04:51 PM

I brought a bike pump with me. Makes perfect sense to me.

Sent from my Nexus 5 using Tapatalk

gramicci101 · 05-27-2014, 04:52 PM

A [ame="http://www.amazon.com/250-PSI-12-volt-Air-Compressor/dp/B000KHH3U8"]12V air compressor[/ame] wouldn't work?

*note: not recommending that specific air compressor, merely providing a representative example.

CSG Mike · 05-27-2014, 05:05 PM

Quote:

Originally Posted by CSG David

Everybody laughs at me for bringing a bike pump. I'm also the guy everybody asks to borrow the bike pump to pump up their tires after the track day.

See. I solved the obesity problem already.

You do realize you have a Honda air compressor in the trunk of your CR...

gramicci101 · 05-27-2014, 05:09 PM

This is like the family that only communicates via text. Don't you guys work together?

CSG David · 05-27-2014, 05:16 PM

Quote:

Originally Posted by gramicci101

This is like the family that only communicates via text. Don't you guys work together?

We work from everywhere. I AM BATMAN! Batman...baatman...ba...

CSG David · 05-27-2014, 05:16 PM

Quote:

Originally Posted by CSG Mike

You do realize you have a Honda air compressor in the trunk of your CR...

I'm not going to blow that one up from using it so much. It's also going to blow the fuse on non-CR cars too.

05-27-2014, 02:36 PM	#1317
becauseracecar1 Senior Member Join Date: Mar 2014 Drives: Posts: 167 Thanks: 143 Thanked 52 Times in 35 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Nitrogen vs regular air in the tires for track day? Thanks!! Sent from my iPhone using Tapatalk __________________ 2014 Ultramarine Scion FR-S facebook.com/86motorsports

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Simple question, hard to find answer...	Mango22	Suspension \| Chassis \| Brakes -- Sponsored by 949 Racing	5	05-16-2013 06:23 PM
Silly question about protecting track rims	sw20kosh	Tracking / Autocross / HPDE / Drifting	16	04-25-2013 12:34 PM
Asking the question that I already know the answer to. Are the engines the same?	Bigmaxy	Engine, Exhaust, Transmission	10	01-19-2013 07:47 PM
Random dog-related question for those who have their BRZ	GMU-BRZ	BRZ First-Gen (2012+) -- General Topics	11	05-31-2012 07:48 AM
Got my answer - BRZ comes with HID headlights as STD	Z_Rocks	BRZ First-Gen (2012+) -- General Topics	20	01-10-2012 09:54 AM

05-27-2014, 03:13 PM	#1322
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,535 Thanks: 8,927 Thanked 14,181 Times in 6,837 Posts Mentioned: 966 Post(s) Tagged: 14 Thread(s)	Multiple posts got combined into one post there.. >>,

05-27-2014, 04:51 PM	#1325
jvincent Senior Member Join Date: Sep 2013 Drives: 2022 WRB BRZ Sport-Tech Location: Ottawa, Canada Posts: 1,746 Thanks: 131 Thanked 1,410 Times in 715 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	I brought a bike pump with me. Makes perfect sense to me. Sent from my Nexus 5 using Tapatalk

05-27-2014, 04:52 PM	#1326
gramicci101 Off Topic Join Date: Feb 2014 Drives: 2014 Subaru BRZ Limited Location: Vegas, baby! Posts: 4,610 Thanks: 2,369 Thanked 4,243 Times in 2,170 Posts Mentioned: 43 Post(s) Tagged: 3 Thread(s)	A [ame="http://www.amazon.com/250-PSI-12-volt-Air-Compressor/dp/B000KHH3U8"]12V air compressor[/ame] wouldn't work? *note: not recommending that specific air compressor, merely providing a representative example.

05-27-2014, 05:09 PM	#1328
gramicci101 Off Topic Join Date: Feb 2014 Drives: 2014 Subaru BRZ Limited Location: Vegas, baby! Posts: 4,610 Thanks: 2,369 Thanked 4,243 Times in 2,170 Posts Mentioned: 43 Post(s) Tagged: 3 Thread(s)	This is like the family that only communicates via text. Don't you guys work together?

User Name		Remember Me?
Password