heres the problem im running into. i baught a set of kuhmo 712 tires instock 16 inch cavy size. the sidewall is too damn soft on this tire for cornering. so i put on a 7 inch rim and it made a big difference but im still getting some tire roll from this tire. more than my radial t/a 14 inch winter wheels even and thats a 60 series tire. whats the most air i can run in this tire without having it buldge and create a worn out spot in the center?
parting out my built and boosted 97 z24 so4x4.com/cavy.html for pics and a parts list
The max should me written on your tire. Max is usually
about 45 I think.
But obviously you should never go that high.
I believe 30 - 35 psi max is where you should be at,
but I could be wrong.
try 35-40
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- Sold my beloved J in April 2010 -
Accually try 32 pounds...i use to work for goodyear and that is what they told us to set all tires at..
NEVER inflate a tire to the maximum listed on the sidewall!!
When you drive and the tires heat up, the pressure increases. You don't want it going beyond the max when it does.
Thahydro wrote:Accually try 32 pounds...i use to work for goodyear and that is what they told us to set all tires at..
Are you kidding me??? Regardless of size or car or anything? That's the most ridiculous thing I've ever heard!
Besides it being an utterly rediculous idea to set every tire to the same thing regardless of what it is or what it's on, 32 is generally on the low side for our cars if you want to stiffen the ride.
I'm not sure what the stock recommendation is (my sticker is gone) but I seem to recall it being 34 or something around there.
Regardless, I run my 225/40/18's at 37 right now and am happy with them. I was running around 35 and found too much roll during an autox. Then I bumped them up to 40 (max on mine is 50) and was happy with that for the autox but over time I found the wear seemed to favour the sides a bit so I've settled on 37 as being ideal for me.
Sometimes it takes a bit of experiment and tuning to get what you want.
actually, 32 is not rediculous. in most of all the cars i've seen (even on a few trucks and stuff) the normal operating psi has been about 32. if not, somewhere in the immediate close range of 32 (30-35). our jbodies to be specific are 30.
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- Sold my beloved J in April 2010 -
i work at a volvo dealership, we set all the cars to 34 psi and the xc90 trucks to 36 psi. my cavvy i usually set to 33-34 or so.
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heres an attached list of tire pressures per size, as listed from nittos site. depending on the rating, the sidewall, things can be different by 2-7 or more psi.
all sizes listed deal with the J body.
- Attachments
- TP.JPG (57k)
<img src="http://registry.gmenthusiast.com/images/eventomega/TP.JPG">
Viper98912 wrote:actually, 32 is not rediculous. in most of all the cars i've seen (even on a few trucks and stuff) the normal operating psi has been about 32. if not, somewhere in the immediate close range of 32 (30-35). our jbodies to be specific are 30.
It's not the number 32 itself that is ridiculous. It's the idea that you can just set EVERYTHING to 32 regardless of what it is.
Hummer? 32. Aveo? 32. Ferrari? 32.
I mean, at least LOOK at the sticker on the door to see what the engineers thought was appropriate!!
i have to agree with wild weasel: i set mine at 40, and my tires wear great.....and i have 215/40/18's. been doing it for over 2 years and no problems at all
ClassGlass / RkSport / Eibach / Motegi / Ractive / Borla / K&N
thanks for all the info guys, i havent had a chance to check this in a bit and just popped back in. i had the tires set to 32 and now to 34 and it seems better and more controlled. id like to inflate them as much as i can without haing them bubble and loose a bit of traction. so far 34 seems to work good. i mgonna get a twistys run in with this setup and then try again at 36 all around and see what i find to work better for me. i think the max for the 712's is like 46 psi. thanks again for the input
parting out my built and boosted 97 z24 so4x4.com/cavy.html for pics and a parts list
All of GM's cars wether it be a Impala, Cavalier, Park Avenue, Regal, Bonnieville, etc are 30psi recommendation from the factory only exception is the Malibu which is 29psi front and 26psi rear. Now the older cavys like late 80's early 90's were 35psi. I would say that 30psi except for the Malibu is standard on all Pontiac, Chevrolet, Olds, and Buick cars from like 95-up. I would say of all the cars we service at my garage the avg psi wether domestic or foreign is 30psi best bet is to check your door jam, glove box, trunk lid, gas door, center counsel lid for the recommended tire inflation. Never go by the sidewall that number is Max pressure of the tire to carry the max load.
last year on my stock rims with RSA'a daily was 38front and 34 rear... autoX 44 front and 38 rear
this year i'm on falken 451 17" 42 front and 40 rear daily... autoX 48 front 44 rear. Max tire psi 51
the wear on the tires are even so far
nice, thats always good to hear, i might bump my tires up to 36 and see how it rides at that prssure. ive probably said that a hundred times, ill do it today though, lol
parting out my built and boosted 97 z24 so4x4.com/cavy.html for pics and a parts list
i keep all of my cars around 35 psi
judgez24 wrote:nice, thats always good to hear, i might bump my tires up to 36 and see how it rides at that prssure. ive probably said that a hundred times, ill do it today though, lol
keep in mind though tire size makes a difference, a huge difference on the tire pressure you will use... his tire sizes are different than yours i believe.
oh i know that, im jut trying to find the best setting for them without wearing them unevenly
parting out my built and boosted 97 z24 so4x4.com/cavy.html for pics and a parts list
Cavalier Tire pressure is stated on the driverside door
Every model is different................Cavaliers, Sunfires, Sunbirds, Berettas, Corsica are supposed to be set at 30psi (cold) so 32 on a warm tire is fine
This is a standard thing, it's either written on the driverside door, Trunk Lid, or Gas Filler door on every car, regardless of make or model. This should be used as law, if it says 30(cold) on the door........then do it. This is for straight street driving for even tire wear, for drag racing or Autocross it can be changed, for a stiffer corners or better traction, but I wouldn't go on a long trip like that
The manufacture puts this sticker on for a reason, the didn't just pick a random PSI out of the sky, there was calculations involved in this
Duro
joey davis wrote:i have to agree with wild weasel: i set mine at 40, and my tires wear great.....and i have 215/40/18's. been doing it for over 2 years and no problems at all
Mine didn't look like they were wearing badly or anything but if you look at my old tires, you can see that there's clearly less tread left around the middle than at the edges.
I've decided to run 36 on the new ones to see how it goes.
Cameron Diebold wrote:Cavalier Tire pressure is stated on the driverside door
Every model is different................Cavaliers, Sunfires, Sunbirds, Berettas, Corsica are supposed to be set at 30psi (cold) so 32 on a warm tire is fine
This is a standard thing, it's either written on the driverside door, Trunk Lid, or Gas Filler door on every car, regardless of make or model. This should be used as law, if it says 30(cold) on the door........then do it. This is for straight street driving for even tire wear, for drag racing or Autocross it can be changed, for a stiffer corners or better traction, but I wouldn't go on a long trip like that
The manufacture puts this sticker on for a reason, the didn't just pick a random PSI out of the sky, there was calculations involved in this
Remember though that this number is based on the tire size that comes with the car. You'll want to run a bit higher pressure if you're running lower profile tires on larger wheels. This is where the experimentation comes in. You're absolutely right if you're using stock tire sizes. Go with what's on the door.
