2-5 PSI change the entire feel of the car
#1
Cold Racketeer
Thread Starter
2-5 PSI change the entire feel of the car
Welp, I just decided to bump my PSI up 2.5 in the front and 4 in the rear... and all I can say is holy cow. I'm going to take a lot more consideration of tires and PSI from now on. The car feels lighter, turns easier, and accelerates better, all in a "very noticable" way.
#2
Dragging knees in
iTrader: (2)
Originally Posted by tzakiel
Welp, I just decided to bump my PSI up 2.5 in the front and 4 in the rear... and all I can say is holy cow. I'm going to take a lot more consideration of tires and PSI from now on. The car feels lighter, turns easier, and accelerates better, all in a "very noticable" way.
![Nod](https://acurazine.com/forums/images/smilies/nod.gif)
#4
Burning Brakes
100% correct. you car will be more of a stiffer balance ride with more air and more of a mushy ride with less. I always chekc my pressure every 3 days to make sure its where I want it.
#5
Cold Racketeer
Thread Starter
Originally Posted by NFLblitze1
did u add the PSI in ur tires...because they were low on air? or did u add 2.5 psi and 4 psi to the stock specs
#6
Originally Posted by tzakiel
No, I am running a PSI that i can only guess is close, since i have aftermarket rims and tires. I'm at 41 front 43 rear right now and it seems good. 245/45/18 toyo proxes 4 and 18x8.5 wheels.
What does it say on the sidewall about maximum tire pressure?
Not that it matters for this conversation, because that is way too much air, but I am just wondering.
#7
Banned
iTrader: (1)
Join Date: Jul 2002
Location: Floyds Knobs, IN
Age: 59
Posts: 680
Likes: 0
Received 1 Like
on
1 Post
Originally Posted by tzakiel
No, I am running a PSI that i can only guess is close, since i have aftermarket rims and tires. I'm at 41 front 43 rear right now and it seems good. 245/45/18 toyo proxes 4 and 18x8.5 wheels.
You might pay attention the the wear patterns and if the center of the tire shows more wear than the sides, you might need to drop the air pressure a couple of pounds.
Trending Topics
#8
Burning Brakes
hmm.. ths is making me think...
how much do would i have to put? outside is just at the freezing point (32 deg.) and i have tsx rims w/ falken 512.... i put them at 35 psi (i checked this last week when it was about 55-60 degs)... should i stay? or add more to compensate for the colder temperature..?
how much do would i have to put? outside is just at the freezing point (32 deg.) and i have tsx rims w/ falken 512.... i put them at 35 psi (i checked this last week when it was about 55-60 degs)... should i stay? or add more to compensate for the colder temperature..?
#9
Banned
iTrader: (1)
Join Date: Jul 2002
Location: Floyds Knobs, IN
Age: 59
Posts: 680
Likes: 0
Received 1 Like
on
1 Post
Originally Posted by whatwasthat
hmm.. ths is making me think...
how much do would i have to put? outside is just at the freezing point (32 deg.) and i have tsx rims w/ falken 512.... i put them at 35 psi (i checked this last week when it was about 55-60 degs)... should i stay? or add more to compensate for the colder temperature..?
how much do would i have to put? outside is just at the freezing point (32 deg.) and i have tsx rims w/ falken 512.... i put them at 35 psi (i checked this last week when it was about 55-60 degs)... should i stay? or add more to compensate for the colder temperature..?
If you look in the driver's door jam it recommends what you need to be running for 17"s
#10
Cold Racketeer
Thread Starter
Originally Posted by Ron A
Nobody should ever run tires for street use at 41 and 43 lbs. If you set them when they were cold, the pressure will increase, depending on the outside temperature and the speed you are driving, at least 3 lb, which makes it even more worse (bad English but I'm making a point here).
What does it say on the sidewall about maximum tire pressure?
Not that it matters for this conversation, because that is way too much air, but I am just wondering.
What does it say on the sidewall about maximum tire pressure?
Not that it matters for this conversation, because that is way too much air, but I am just wondering.
the max pressure for the toyo proxes 4 245/45/18 is 50 lbs. I have not been able to have anyone tell me what the correct pressure is for my car, including my dealer, ronjon (i have ronjon rims), the tire shop (they said they filled it correctly the first time but dont have a record of what that was) or this forum.
#13
Instructor
Join Date: Dec 2001
Location: Atlanta, GA
Age: 67
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by tzakiel
No, I am running a PSI that i can only guess is close, since i have aftermarket rims and tires. I'm at 41 front 43 rear right now and it seems good. 245/45/18 toyo proxes 4 and 18x8.5 wheels.
With those higher pressures, you would need to stiffen the suspension to optimize such a setting. It's all about tuning, not maximizing one parameter alone.
rw
#14
The DVD-A Script Guy
Since "sidewall chalking" is no longer recommended for modern tires I guess you'll just have to get a pyrometer
and measure the temps.
Seriously, aren't the a-spec rims 18" ? If so what are they all running ?
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
Seriously, aren't the a-spec rims 18" ? If so what are they all running ?
#15
Cold Racketeer
Thread Starter
I made a mistake in my reporting of my PSI, somehow they must have alreayd been hot even though i had only gone 1.5 miles.
The real PSI I am at that feels good is 38 front, 40 rear. And that seems really sweet. Like I said when they came out of the tire shop they were at 40f and 45r which I thought was bizzare.
Also I do have the comptech RSB so that helps handling in general too.
The real PSI I am at that feels good is 38 front, 40 rear. And that seems really sweet. Like I said when they came out of the tire shop they were at 40f and 45r which I thought was bizzare.
Also I do have the comptech RSB so that helps handling in general too.
#16
Cold Racketeer
Thread Starter
Originally Posted by sparky57
I'm with Hondafans concerning reducing understeer, not increasing it. I run 245/40-18s as well and use the factory A-Spec settings of 39/36 front/rear.
With those higher pressures, you would need to stiffen the suspension to optimize such a setting. It's all about tuning, not maximizing one parameter alone.
rw
With those higher pressures, you would need to stiffen the suspension to optimize such a setting. It's all about tuning, not maximizing one parameter alone.
rw
#17
Instructor
Join Date: Dec 2001
Location: Atlanta, GA
Age: 67
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by tzakiel
The real PSI I am at that feels good is 38 front, 40 rear... Also I do have the comptech RSB so that helps handling in general too.
rw
#18
Instructor
Join Date: Dec 2001
Location: Atlanta, GA
Age: 67
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by tzakiel
But you have the MT or the AT? The specs are different for PSI.
Twenty five years ago, however, I biased the front tires of my '81 Accord for the same reason. There is a current Pontiac that achieves the same result by putting larger tires on the front than the rear.
rw
#19
Cold Racketeer
Thread Starter
I heard back from Toyo. Using the information I gave them about size and model of the car, they tell me the correct PSI is at least 39 PSI all the way around. So that's what I'll be using.
#20
Dragging knees in
iTrader: (2)
Originally Posted by sparky57
I have the manual. While the suspension stiffness is slightly different between the two, the overall assumption is that those who choose the manual want better cornering.
Twenty five years ago, however, I biased the front tires of my '81 Accord for the same reason. There is a current Pontiac that achieves the same result by putting larger tires on the front than the rear.
rw
Twenty five years ago, however, I biased the front tires of my '81 Accord for the same reason. There is a current Pontiac that achieves the same result by putting larger tires on the front than the rear.
rw
As for the tire shop... do you honestly believe they know what they are doing? They just fill it up to whatever pressure they "think" is okay and that's that. I've never once gotten the correct tire pressure at a tire shop. Only the tire company knows it best, and this information is pretty easy to find. Any major tire manufacturer has web sites with the specs of their tires listed with the range of proper air pressure, and you can choose whatever pressure you want from there.
#21
Originally Posted by Adobeman
Since "sidewall chalking" is no longer recommended for modern tires I guess you'll just have to get a pyrometer
and measure the temps.
?
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
?
sidewall chalking....
#22
Dragging knees in
iTrader: (2)
Originally Posted by mbwmn
wow, dude we're OLD.
sidewall chalking....
sidewall chalking....
![rofl](https://acurazine.com/forums/images/smilies/rofl.gif)
![rofl](https://acurazine.com/forums/images/smilies/rofl.gif)
I've heard of this sidewall chalking....
![Big Grin](https://acurazine.com/forums/images/smilies/biggrin.gif)
Actually, I think the Spec Miata guys still use this method, don't they? I was reading an article on the Spec Miata Racing not too long ago and I believe they mentioned it.
![Shrug](https://acurazine.com/forums/images/smilies/shrug.gif)
#23
Instructor
Join Date: Dec 2001
Location: Atlanta, GA
Age: 67
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Pure Adrenaline
As for the tire shop... do you honestly believe they know what they are doing?
I go for the manufacturer's recommendations since they tuned the suspension for a given setting. The tire manufacturer has no idea whether the tire is going to be used on a FWD, RWD, or mid engined car where the ideal front to rear pressures are all different.
rw
#24
Dragging knees in
iTrader: (2)
Originally Posted by sparky57
Was that question directed to me?
I go for the manufacturer's recommendations since they tuned the suspension for a given setting. The tire manufacturer has no idea whether the tire is going to be used on a FWD, RWD, or mid engined car where the ideal front to rear pressures are all different.
rw
I go for the manufacturer's recommendations since they tuned the suspension for a given setting. The tire manufacturer has no idea whether the tire is going to be used on a FWD, RWD, or mid engined car where the ideal front to rear pressures are all different.
rw
You're right, though. Tire manufacturers don't know the application of the tires. However, they do know the range of pressure that the tire should be inflated to. hence the reason I said, once you find that info from the manufacturer, find the pressure you want to inflate it to within that range.
Tire shops generally don't know the recommended pressure, much less the owner's preference. So they just pump 'em up and send 'em out. That was my point. For instance, my T1-S were pumped to over 44 psi in all 4 of them when I had them mounted at Belle Tire, and that is pretty high for 235/40/18 on a 2G TL. I currently run them at 38F/35R and that's a bit on the stiff side with soft damping rates on the street. I tend to mess around a lot with my damping rates and tire pressure.
Thread
Thread Starter
Forum
Replies
Last Post
divac
5G TLX Tires, Wheels & Suspension
16
08-29-2018 10:13 AM
Oakes
Wash & Wax
10
10-12-2015 11:17 AM