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Is there a low cost way to fill tires with nitrogen for HPDE events?

Roushdude

TMO Beginner
I know often times you can order new wheel and tire combination with a nitrogen fill, but does anyone know of a cheap way to bring your own nitrogen to the track say in a Longacre air tank or something similar?
 

racer47

Still winning after 30+ years
252
264
SE WI
W2W Racing
20+ Years
Its not worth the effort imho. If you have an air compressor at home, drain it once in a while and you'll be good.
 

Fabman

Project: "Frankenstang"
2,758
1,715
Pleasanton: 1/2 way between Sonoma and Laguna Seca
W2W Racing
20+ Years
Try a welding supply shop: Praxiar, Airgas, etc. You should be able to buy a small bottle and regulator and have it refilled whenever you need to.
This is exactly what I do. I have a big bottle that I fill the sticker tires with and a small bottle that I bring to the track for pressure adjustments.
There is a lot of debate about whether or not nitrogen is necessary for a track car.
I'd say in most situations it probably isn't. But I've \been racing on slicks for decades and have always done it, so I continue to do so. My pressures grow far less, far more predictably, so...why not? First few laps while other drivers are getting their tires up to temp and pressure I'm already there...so again, why not?
 
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Fabman

Project: "Frankenstang"
2,758
1,715
Pleasanton: 1/2 way between Sonoma and Laguna Seca
W2W Racing
20+ Years
I'll tell you a little story, and how I know how much nitrogen and air differ in expansion rate, I ran late model stock cars for decades. We use a fully locked rear end...a "Spool" so both rear tires are solidly locked together. One major tuning tool we had was to adjust the rear stagger (RR tire is bigger than the LR tire) to help it around the corner. Problem is, when you buy tires you don't always get the exact stagger you wanted no matter how much you plead with the tire guy. So when I fell short on stagger I would put Nitrogen in my LR and Compressor air in the RR and as the tires warmed up on track the stagger would increase. I could start with an under-steering pig and end up with a neutral or over steering car within a 25 lap race on as small as a 1/4 mile track. I've seen the Hoosier full slicks that we ran grow as much as 1 1/2 ". That's a bunch. Granted they were bias plys, so they stretch more easily than radials, but the pressure grows regardless of the tire type and whether or not its actually getting bigger. Winston cup cars fine tune spring rate with pressure, a tire is also a spring so small changes in PSI have a noticeable effect on handling beyond deformation rate. You're adjusting the spring rate as well. Again, this is probably not critical for most track day situations but know that its real and totally appropriate in the right situations.
 

byronj

TMO Addict
1,903
723
Bay Area
IMHO, it’s not worth it. Yes we haul ass, heat up tires, but we are not doing 30,000 plus feet above sea level flights and going ove r600 mph. Now if you're a LSR racer then look into it.
 

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