Tire psi question

[Gr00v3]

what's a good aggressive street/occasional touge/autox setup for 14" azenis... tire pressure wise

DISCUSS!
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Angelinalove

[Digitalwave]

Occaisonal touge? You are out there every single time I talk to you :)

[Gr00v3]

Occaisonal touge? You are out there every single time I talk to you :)

just a lil bit

/50cent

NOBODY CARES! FUCK YOUR ASSHOLES
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Bubblers

[Bavarian3]

What are you running now?

[Gr00v3]

the shop put it at 38 up front and 36 in the rear...
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[nando]

38-36 psi is probably not nearly enough. that's a good value for the street but you're going to shred the outer tred blocks and sidewalls your first time out.

to start you can use chalk to check if you have enough pressure. on each tire make 3 marks on the outside sholders of the tire (making sure to go all the way to the sidewall). I'd probably start out at around 45psi (fill them cold!), you can always let some out if you have too much.

make your autox run, and check the chalk marks. if you have rubbed all the chalk off the sidewalls, you don't have enough pressure (this is more likely to happen on the front tires). if there's still chalk left on the shoulders then you have too much. it's not exact but it can give you a good idea. also, the RWD E30s I know usually run ~4psi less in the rear.

a better way to check is with a pyrometer, measuring the inside, outside and middle temps of the tire. probably not a good idea to buy one for occasional use but ask around, maybe somebody will be willing to take temps for you. A pyrometer can tell you a lot more about your suspension setup too, I found out that I don't have nearly enough negative camber up front (outsides of my tires were WAY hot).

you must fill your tires when cold, because driving even a mile will warm them up to where your pressure readings are not accurate. I start out with my fronts at 48psi and after 1-2 runs the heat causes the pressure to read up 5-7psi. if you try to fill them hot by the time you get to your last tire your pressure readings will have changed and they will be all uneven.