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YOUR RESEARCHTire pressures
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The manual says for 18" wheels (which is what I run), recommended pressure is 36/44 lbs.
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Suggestion
However, I think some degree of consideration has to be given to driving conditions and location, i.e., the track guys adjusting for warm tires, or if I lived in a pothole state, I would experiment adjusting the pressures to obtain a decent ride over bad roads and potholes.
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Suggestion
However, I think some degree of consideration has to be given to driving conditions and location, i.e., the track guys adjusting for warm tires, or if I lived in a pothole state, I would experiment adjusting the pressures to obtain a decent ride over bad roads and potholes.
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Suggestion
I have been reading for years to check the 'cold' tire pressure.
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Suggestion · Original poster
The manual says for 18" wheels (which is what I run), recommended pressure is 36/44 lbs.
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Adjust pressures
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Suggestion
However, I think some degree of consideration has to be given to driving conditions and location, i.e., the track guys adjusting for warm tires, or if I lived in a pothole state, I would experiment adjusting the pressures to obtain a decent ride over bad roads and potholes.
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Suggestion
Keep in mind those are recommended pressures, a little bit lower to "soften" the tires so the car is not being pounded to death on bad roads is not a bad thing.
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Suggestion
even on the street because that one time you need to avoid a ladder that just fell off a truck is when you will need that razor sharp response from a tire that does not load up deform and then change direction of the car.
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What kind of tire pressure are you guys running? The manual says for 18" wheels (which is what I run), recommended pressure is 36/44 lbs. That seems REALLY high, and ride at that pressure is really rough. I'm on Nitto NT-01s (drive to the track). Hot pressures at the track run about 32/36. But what about cold pressure on the street?
P.S. It's a '99 996 C2
36/44 on the street. I drop to 42 in the rear for autocross, but I have rear camber close to max at -2 degrees.
Keep in mind I bleed the pressures off between runs to keep the hot pressure the same. I have to pump them back up when I leave the event.
Same here with 18" wheels. I run the recommended pressures 36/44 psi. But I live in Florida so most roads and flat and smooth. However, I think some degree of consideration has to be given to driving conditions and location, i.e., the track guys adjusting for warm tires, or if I lived in a pothole state, I would experiment adjusting the pressures to obtain a decent ride over bad roads and potholes. Keep in mind those are recommended pressures, a little bit lower to "soften" the tires so the car is not being pounded to death on bad roads is not a bad thing.
Remember, more pressure-> less contact patch, less rolling resistance, less rollover onto sidewall when cornering
Less pressure-> more contact patch, more rolling resistance, more rollover onto sidewall
Lowering the pressure might "soften" the effective spring rate of the tire, but you will experience more rolling resistance, more likelihood of a big hit deforming the tire enough to debead or damage the wheel, and more deformation under cornering.
right. my main focus on tire pressure is handling not ride comfort. even on the street because that one time you need to avoid a ladder that just fell off a truck is when you will need that razor sharp response from a tire that does not load up deform and then change direction of the car.
I have been reading for years to check the 'cold' tire pressure. But what is 'cold' tire pressure? Somewhere it says a minimum of 3 hours after driving. In my garage in upstate NY it is 30 degrees F. right now, but at my condo in Florida it is 80 F. The 'cold' measurement will be dramatically different in each place, as will the tires' performance at the same inflation.
Can't find anywhere that sorts this out technically for me.
Check this out.
http://www.tirerack.com/tires/tirete....jsp?techid=73
Should give you the info you need. Your instincts are correct, tire pressure is affected by ambient air temperature and the variation in ambient air temp.
Thx - good link!
I see where their test says: "We monitored the changes in tire pressure in 5-minute intervals. "
Not sure how they do this, but it seems every time I put the gauge on the valve 1/2 pound leaks out!
https://rennlist.com/forums/images/smilies/frown.gif
BTW, I highly recommend this digital gauge
Amazon.com: Accutire MS-4350B Setpoint Tire Gauge: Automotive
Amazon.com: Accutire MS-4350B Setpoint Tire Gauge: Automotive
It waits for pressure to stabilize before taking the reading and will beep when the reading is ready. You get consistent reading all the time and don't lose 1/2 pound when you put it on.
This is a source reference. Confirm exact model applicability in the original material.
