Tire pressures
- Thread starter IGOTASTi
- Start date
Listen to drew.
I'm running 38/36 but my tires are different.... and I don't even know if that's right for them. :lol:
Lots of factors will dictate what tire pressures I end up using, including:
+ Tire brand/model/construction
+ Size of tire relative to the wheel
+ Weight balance of the car (front/rear)
+ Handling of the car
+ Street or autox or track use.
Without knowing any of those variables for your car, I'll assume you meant for autocross use, that you're using stock 8" wide wheels and ~245mm tires, and the car is your STi. For a front heavy car like most Subarus end up being (60% F/40% R is common) I would ALWAYS bias the tire pressures to the front. Meaning: I'd run +5 psi on the fronts compared to the rears, at least.
+ To reduce understeer: run more front pressure or less rear pressure
+ To reduce oversteer: you shouldn't ever have a Subaru that oversteers!
I've autocrossed in a lot of Subarus with Bridgestones and usually end up with 38-40 psi front, 32-35 psi rear. Again, if the car isn't behaving I'll adjust the bias to try to alter it.
Cheers,
Terry Fair @ Vorshlag
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Terry,
isn't that exactly what I said?!
You just added bullet points and pictures.
if you look inside your door jam it's the suggested tire pressure for the rear. It will increase rear grip and the sidewall stiffness of the RE070s makes it ok. This is for the street only, a little more pressure all around works good for the stock bridgestone RE070s when autoxing.
isn't that exactly what I said?!
You just added bullet points and pictures.
if you look inside your door jam it's the suggested tire pressure for the rear. It will increase rear grip and the sidewall stiffness of the RE070s makes it ok. This is for the street only, a little more pressure all around works good for the stock bridgestone RE070s when autoxing.
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Good info. I'm glad to see you and T3h_Clap are on the same page. I'll take this into account next year. I was only having the rear -2 PSI from the front. I'll play with the settings and see how I like it. With correct tire pressure and Star Specs instead of my old RE760's it should be a fun season.
Terry,
isn't that exactly what I said?!
You just added bullet points and pictures.
if you look inside your door jam it's the suggested tire pressure for the rear. It will increase rear grip and the sidewall stiffness of the RE070s makes it ok. This is for the street only, a little more pressure all around works good for the stock bridgestone RE070s when autoxing.
Terry's post was much prettier than yours. :lol:
I'm all about the pretty.
For the street I run tire pressures as low as I can, for better ride quality. I drive pretty tame on the street, so 30-32 psi is as high as I go unless I plan on taking a back country blast through the twisties. Of course my truck has its tires at 80 psi all the time (rides like crap), but that's because we tow a 38' Gooseneck trailer behind it (80 psi is used for max load capacity); I'm too lazy to switch back to the normal 50 psi it needs for normal street use.
I'm off to SEMA! Pictures on Monday...
Bluedemon_II
New member
Any reason to lighter on the back, pressure wise? I always put mine to about 45psi. I'm Using nexen n3000 tires.
joey.lisano
New member
I run 40/40 on the stock wheels and tires because I like a harsh ride. There's absolutely nothing scientific behind that, and I know it's not correct for maximum performance. I just like to feel the road.
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