Different rear tire pressures for heavy driver?
09-07-2006, 10:25 AM
#1
Melting Slicks
Thread Starter
Different rear tire pressures for heavy driver?
Im seeing my LR likes about 3 psi more than my RR in the visible wear pattern on the edge of the tire (Nittos have arrows to check outside edge wear contact surface). I have Nittor R2's and Im assuming my weight of 255 lbs is the cause and if I run same psi on rears the LR shows much more wear towards the edge.
Anyone else notice this occuring?
Anyone else notice this occuring?
09-07-2006, 02:10 PM
#3
Le Mans Master
No, I don't think it's your weight; they're not *that* sensitive.
Let's do some math:
Assume your car weighs 3200 lbs, has a 50/50 weight distribution, and your ride heights are dead on (i.e., each wheel has 800 lbs load).
You get into the car. The car now weighs 3455, or 864 lbs load. 64 pounds isn't going to make that much difference.
Two thoughts: Are you taking the psi difference off of the tire sensors? They do have some deviation in them. 3 of the four of mine are really close to outside measurements; one reads about 2 psi high. So, that could be your difference.
Second, it could be that that specific tire likes 3 psi more air pressure. Unusual, but again there's variation in what tires like.
HTH, and have a good one,
Mike
Let's do some math:
Assume your car weighs 3200 lbs, has a 50/50 weight distribution, and your ride heights are dead on (i.e., each wheel has 800 lbs load).
You get into the car. The car now weighs 3455, or 864 lbs load. 64 pounds isn't going to make that much difference.
Two thoughts: Are you taking the psi difference off of the tire sensors? They do have some deviation in them. 3 of the four of mine are really close to outside measurements; one reads about 2 psi high. So, that could be your difference.
Second, it could be that that specific tire likes 3 psi more air pressure. Unusual, but again there's variation in what tires like.
HTH, and have a good one,
Mike
09-07-2006, 04:03 PM
#4
Team Owner
Member Since: Mar 2001
Location: small town in S.E Pa. PA
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St. Jude Donor '03-'04
If your weight was an issue then you would also have to be conscious of driving with a full tank ( = +120 lbs ) or something less... You have an alignment issue.
09-07-2006, 04:25 PM
#5
Melting Slicks
Thread Starter
Just had it aligned by the most reputable Vette shop/tech around here as I thought that first also. That would be pretty big camber camber issue being off, but ill have to have it rechecked.
PSI is being taken with a Rebco 0-30 dial gauge and checked with a different 0-45 dial gauge also..
PSI is being taken with a Rebco 0-30 dial gauge and checked with a different 0-45 dial gauge also..
Last edited by briann510; 09-07-2006 at 05:21 PM.
09-07-2006, 04:59 PM
#6
Team Owner
Originally Posted by Evil-Twin
If your weight was an issue then you would also have to be conscious of driving with a full tank ( = +120 lbs ) or something less... You have an alignment issue.
I agree
(Nice to see you are alive ET !!)I weigh 100 lbs less than you ......na,na,na,na,na,na.......
Seriously, I run the same tires ..... they are soft. I run less PSI in the rears so I can get better traction on the street and I track the car .... and still I get even wear.
DH
09-07-2006, 05:12 PM
#7
Burning Brakes
Your driver weight will not be distributed evenly between all 4 wheels when you are setting in the left rear of the car.
Try getting alignment done/readings while sitting in car.
Try a different alignment shop.
You can also get a infrared temp sensor and check your tire temps, outer, middle, inner.
Try getting alignment done/readings while sitting in car.
Try a different alignment shop.
You can also get a infrared temp sensor and check your tire temps, outer, middle, inner.