Can not find a person who actually knows proper tire pressures!
11-13-2008, 10:18 PM
#1
Can not find a person who actually knows proper tire pressures!
Ok I Have 19's from Ronjon with General Exclaim UHP (245/35/19) all around. Can someone tell me what the correct air pressure I'm suppose to be running in my tires to get optimal ride comfort and performance out of them, more towards ride comfort.
I have been running 37psi all around thus far and stupid me didn't realize till recently to check the General websiite where it said the maximum tire pressure that it can handle is 51 psi. My cold air pressure is about 37 but after driving I've seen it go up to about 40 nothing higher. I don't want to blow out my tires but I feel the car right now has poor handling.
Advice?
I have been running 37psi all around thus far and stupid me didn't realize till recently to check the General websiite where it said the maximum tire pressure that it can handle is 51 psi. My cold air pressure is about 37 but after driving I've seen it go up to about 40 nothing higher. I don't want to blow out my tires but I feel the car right now has poor handling.
Advice?
11-13-2008, 11:19 PM
#2
Registered but harmless
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1) Is there a recommendation from RonJon on the proper pressure? If yes, use that pressure as a start.
2) If not, go to at least 39F/36R, which is what Acura recommended for its 18" A-Spec wheels. I wouldn't run tires inflated above 40 psi on a regular basis unless the wheel manufacturer recommends it.
3) Check and adjust all tire pressures while each tire is COLD.
4) If your handling doesn't improve, your other option is to check (or alter) the alignment to make sure it is appropriate for the 19" wheels and suspension mods.
G/L.
2) If not, go to at least 39F/36R, which is what Acura recommended for its 18" A-Spec wheels. I wouldn't run tires inflated above 40 psi on a regular basis unless the wheel manufacturer recommends it.
3) Check and adjust all tire pressures while each tire is COLD.
4) If your handling doesn't improve, your other option is to check (or alter) the alignment to make sure it is appropriate for the 19" wheels and suspension mods.
G/L.
11-14-2008, 05:26 AM
#3
It's a mixed bag as the 19" tires that you have on the TL are actually XL rated, or an Extra Load tire, not designed for the lighter Acura. The XL tires normally will have a higher max inflation pressure eg 51 lbs and require a cold pressure somewhere around 41 lbs because of the heavier weight the tires are designed to carry. Having said that, lower pressures are fine as the tire will not flex because of the tire is much stiffer in construction. Can't tell you the exact air pressure to run, but tire manufacturers do have a formula as to the proper air pressure when tire size is changed, but it will be lower than 41.
Best I can say is to put a chalk line across each tread and ride in a straight line on a smooth surface and see where the line is removed, which will probably be in the center if running 40 lbs. Adjust the air pressure up or down accordingly.
On our TL, normal would be 32/32, so just out of curiosity I called Yohokama when I installed the S.4 245/45-17 for their input on the recommended tire pressure. It went to their Tech service dept. and the fellow called the next day with 31/31.
On some 4x4's equipped with large extra load tires, guys are running 30 lbs and see perfect tread wear, just because of the heavier construction within the tire.
Best I can say is to put a chalk line across each tread and ride in a straight line on a smooth surface and see where the line is removed, which will probably be in the center if running 40 lbs. Adjust the air pressure up or down accordingly.
On our TL, normal would be 32/32, so just out of curiosity I called Yohokama when I installed the S.4 245/45-17 for their input on the recommended tire pressure. It went to their Tech service dept. and the fellow called the next day with 31/31.
On some 4x4's equipped with large extra load tires, guys are running 30 lbs and see perfect tread wear, just because of the heavier construction within the tire.
11-14-2008, 11:16 AM
#6
in general -take the max cold and deduct 20%
start there and play within a few psi lower for max comfort
Watch the tire for even wear across the tread
I run 18" generals at 38 front 36 rear normal in town use, that keeps them just soft enough for bumps, and pump them up 2 psi when going to play on the mountain backroads
start there and play within a few psi lower for max comfort
Watch the tire for even wear across the tread
I run 18" generals at 38 front 36 rear normal in town use, that keeps them just soft enough for bumps, and pump them up 2 psi when going to play on the mountain backroads
11-16-2008, 04:34 PM
#7
I just pumped up my cold air pressure to 40psi all around and I definitely notice the increase in pickup feel. I wonder if I can put more air in it, maybe up to 42psi all around. I know the max is 51psi but is that max rated at 51psi cold air pressure or warm?
I know the psi goes up after driving some bit.
I know the psi goes up after driving some bit.
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11-16-2008, 08:04 PM
#8
Suzuka Master
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Why would you want to put anymore air in then what the sticker on the driver door sill says?
11-16-2008, 08:31 PM
#9
Senior Moderator
to the OP, what do you mean by handling, sharpness or loss of control? Higher PSI means loss of traction much more easily, but sharpness increased. Lower psi gives more traction, but sharpness decreased. I find that 35 all around works good for city driving comfort, MPG and tire wear.
11-16-2008, 10:32 PM
#11
on certain replacement brand tires with lower sidewall than stock- you need to run higher than 32 to get proper sidewall stiffness and best life from the tires.
Near 40 on generals is good
Cold Max psi is listed on the tire. That is based on the max allowable weight being placed on the tire. Since its carrying about 80 percent of that number- drop 20 percent of pressure and try that
For ultimate-is this the right pressure--, Use an infra-red thermometer and check the temp across the surface with tires hot from driving- looking for even temps or adjust pressure to increase or decrease contact patch and change temps.
Near 40 on generals is good
Cold Max psi is listed on the tire. That is based on the max allowable weight being placed on the tire. Since its carrying about 80 percent of that number- drop 20 percent of pressure and try that
For ultimate-is this the right pressure--, Use an infra-red thermometer and check the temp across the surface with tires hot from driving- looking for even temps or adjust pressure to increase or decrease contact patch and change temps.
11-16-2008, 10:34 PM
#12
lower psi does NOT increase DRY traction, but its larger contact patch will help in water~
try 80 percent of max cold and see how that works
Hydroplane in water can occur at any speed, but is most likely above 55
Wet is when you may have to play with pressure and run 36 instead of 38
try 80 percent of max cold and see how that works
Hydroplane in water can occur at any speed, but is most likely above 55
Wet is when you may have to play with pressure and run 36 instead of 38
11-18-2008, 07:26 PM
#16
There is a Cold PSI value on the sidewall of ALL tires
Thank you GeezerB ... it took everything I had not to say something sarcastic in response 
As soon as the stock tires are swapped out for different brand tires, different aspect ratios, different load rating, different wheel diameter, blah, blah, blah ... all bets ARE OFF! The door jam sticker is meaningless at this point unless the same OEM tire of the exact size is used as a replacement, which rarely happens around here
As soon as the stock tires are swapped out for different brand tires, different aspect ratios, different load rating, different wheel diameter, blah, blah, blah ... all bets ARE OFF! The door jam sticker is meaningless at this point unless the same OEM tire of the exact size is used as a replacement, which rarely happens around here
11-18-2008, 09:04 PM
#17
Thank you GeezerB ... it took everything I had not to say something sarcastic in response
As soon as the stock tires are swapped out for different brand tires, different aspect ratios, different load rating, different wheel diameter, blah, blah, blah ... all bets ARE OFF! The door jam sticker is meaningless at this point unless the same OEM tire of the exact size is used as a replacement, which rarely happens around here
As soon as the stock tires are swapped out for different brand tires, different aspect ratios, different load rating, different wheel diameter, blah, blah, blah ... all bets ARE OFF! The door jam sticker is meaningless at this point unless the same OEM tire of the exact size is used as a replacement, which rarely happens around here
11-19-2008, 12:14 AM
#18
Team Owner
Thank you GeezerB ... it took everything I had not to say something sarcastic in response
As soon as the stock tires are swapped out for different brand tires, different aspect ratios, different load rating, different wheel diameter, blah, blah, blah ... all bets ARE OFF! The door jam sticker is meaningless at this point unless the same OEM tire of the exact size is used as a replacement, which rarely happens around here
As soon as the stock tires are swapped out for different brand tires, different aspect ratios, different load rating, different wheel diameter, blah, blah, blah ... all bets ARE OFF! The door jam sticker is meaningless at this point unless the same OEM tire of the exact size is used as a replacement, which rarely happens around here
With aftermarket rims/tires the only thing you can get from the sticker is an idea of the % difference from front to rear otherwise it's useless.
11-19-2008, 05:50 AM
#20
I had mine like that a while a go, and it did not feel right.
Then, I had 41F/38R and it was OK. But I found out that 42F/39R works the best.
The reason I'm saying that is because when I drive on a not so smooth road, I felt that 40F/37R was not the proper pressure. I felt it needed more.
Then, I had 41F/38R and it was OK. But I found out that 42F/39R works the best.
The reason I'm saying that is because when I drive on a not so smooth road, I felt that 40F/37R was not the proper pressure. I felt it needed more.
11-19-2008, 08:26 AM
#21
be careful over-inflating the tire for the actual weight of the car
Look at the cars weight and determine actual percentage/weight on each wheel.
One of the tires jobs is to absorb some of the road bumps, too much air and it doesnt flex right.
18-19' general tires should have no prob around 40, and many of us on 18-19 rims are near that pressure.
At the racetrack- hot tires are 2-4 psi higher than when they went on course 20 minutes before.
If you really want to be exact, use a non contact thermometer and check hot temps across the tire. Higher or lower in center is pressure change needed, one edge higher or lower is suspension adjustment
perfect is even across the tire
Look at the cars weight and determine actual percentage/weight on each wheel.
One of the tires jobs is to absorb some of the road bumps, too much air and it doesnt flex right.
18-19' general tires should have no prob around 40, and many of us on 18-19 rims are near that pressure.
At the racetrack- hot tires are 2-4 psi higher than when they went on course 20 minutes before.
If you really want to be exact, use a non contact thermometer and check hot temps across the tire. Higher or lower in center is pressure change needed, one edge higher or lower is suspension adjustment
perfect is even across the tire
11-19-2008, 08:29 AM
#22
The reason to run a few psi lower in the back is to reduce the cars tendancy to oversteer --it improves handling
11-19-2008, 05:08 PM
#23
So,
are u saying that 42F is too much?
But then again, it should be around 40 psi, so 42 is not way too much over or is it? Hmmmmm
are u saying that 42F is too much?
But then again, it should be around 40 psi, so 42 is not way too much over or is it? Hmmmmm
be careful over-inflating the tire for the actual weight of the car
Look at the cars weight and determine actual percentage/weight on each wheel.
One of the tires jobs is to absorb some of the road bumps, too much air and it doesnt flex right.
18-19' general tires should have no prob around 40, and many of us on 18-19 rims are near that pressure.
At the racetrack- hot tires are 2-4 psi higher than when they went on course 20 minutes before.
If you really want to be exact, use a non contact thermometer and check hot temps across the tire. Higher or lower in center is pressure change needed, one edge higher or lower is suspension adjustment
perfect is even across the tire
Look at the cars weight and determine actual percentage/weight on each wheel.
One of the tires jobs is to absorb some of the road bumps, too much air and it doesnt flex right.
18-19' general tires should have no prob around 40, and many of us on 18-19 rims are near that pressure.
At the racetrack- hot tires are 2-4 psi higher than when they went on course 20 minutes before.
If you really want to be exact, use a non contact thermometer and check hot temps across the tire. Higher or lower in center is pressure change needed, one edge higher or lower is suspension adjustment
perfect is even across the tire
11-19-2008, 06:36 PM
#24
Instructor
General's tires are notorious for having a soft sidewall. Try slinging around a 3800 pound on $100 something tires. The 35 series will be a little better, but don't expect them to be better than anything in the $100 price range.
Don't get me wrong, Generals are a great daily driver tire that will have a good mix of tread life, noise, value. Unfortunately, with these tires, you get what you pay for, so don't think they will have any performance capabilities.
Don't get me wrong, Generals are a great daily driver tire that will have a good mix of tread life, noise, value. Unfortunately, with these tires, you get what you pay for, so don't think they will have any performance capabilities.
11-20-2008, 09:09 PM
#25
General's tires are notorious for having a soft sidewall. Try slinging around a 3800 pound on $100 something tires. The 35 series will be a little better, but don't expect them to be better than anything in the $100 price range.
Don't get me wrong, Generals are a great daily driver tire that will have a good mix of tread life, noise, value. Unfortunately, with these tires, you get what you pay for, so don't think they will have any performance capabilities.
Don't get me wrong, Generals are a great daily driver tire that will have a good mix of tread life, noise, value. Unfortunately, with these tires, you get what you pay for, so don't think they will have any performance capabilities.
11-20-2008, 09:26 PM
#26
Oh and also, my friend has these on this S4 and he says he loves them too, like I said I'm not saying these are the best tires, but they are DAM GOOD! Most people prolly would agree and I do know there are those who do spirited driving all the time. But can't the same be said for "ACURA" as a brand too, "great mix of noise, life and value, but dont get me wrong you get what you pay for, so don't think they will have any performance capabilities" that is comparing it to some of the German manufacturers?
11-20-2008, 09:38 PM
#27
Also, sorry for the multiple posts, but I jsut checked my email. I emailed Continental Tires since Generals are basically manufactured by them regarding the tire pressure values... here's the email:
Customer (Raj) - 11/18/2008 12:08 PM
Hey I'm writing this email to seek expert advice on proper tire
inflation pressures on my set of General Exclaim UHP that I have on my
vehicle. I can't adhere to my manufacturers recommended tire pressure
posted on the door jam because I up-sized my wheels from the stock
size of 17's to 19's now. I spoke to Carmen yesterday at Customer
Service and was advised to write an email to seek this info. Here is
my vehicle info:
2006 Acura TL (WITHOUT the ASPEC package) Stock size that came with
the car was 17's.
The Wheels that I have upgraded to have the following specifications:
Size: 19
Width: 8.5
Offset: 42
Center bore: 64.1
Bolt Patter: 5x114.3
The tires that I'm running are:
Brand: General Exclaim UHP
Size: 245/35/19 all around
Many people tell me that I should run them with the following PSI which is what I'm currently doing:
Front: 42 PSI
Rear: 40 PSI
My concern is that, since I'm able to monitor tire pressures through
the electronic sensors I have, when I'm cruising on the highway they
climb up to 45 PSI in the front and 43 PSI in the rear and I know
according to your website, the max PSI is 51 for these tires and I'm
not comfortable being so close to the max. Please advise as to what
is the proper tire pressures I should be running to keep as close to
OEM specifications due to my up-sizing.
Thank You in Advance.
Raj
Here's the reply:
Response (Carmen) - 11/19/2008 02:26 PM
Dear Raj,
Your email was forwarded to one of our engineers Jose who has the capabilities to calculate the proper pressures for your car and his response is that you air pressures are correct. He states that 42 psi in front and 40 psi in the rear is what you should be using. Should you have any further questions please reference your inquiry number 081118-000010.
Thank you,
Carmen
So the proper tire pressure CONFIRMED from Continental Tires themselves for these tires and wheels is
Front: 42 PSI
Rear: 40 PSI
Someone posted something very similar with the -2 psi difference from front to rear so they were point on.
Customer (Raj) - 11/18/2008 12:08 PM
Hey I'm writing this email to seek expert advice on proper tire
inflation pressures on my set of General Exclaim UHP that I have on my
vehicle. I can't adhere to my manufacturers recommended tire pressure
posted on the door jam because I up-sized my wheels from the stock
size of 17's to 19's now. I spoke to Carmen yesterday at Customer
Service and was advised to write an email to seek this info. Here is
my vehicle info:
2006 Acura TL (WITHOUT the ASPEC package) Stock size that came with
the car was 17's.
The Wheels that I have upgraded to have the following specifications:
Size: 19
Width: 8.5
Offset: 42
Center bore: 64.1
Bolt Patter: 5x114.3
The tires that I'm running are:
Brand: General Exclaim UHP
Size: 245/35/19 all around
Many people tell me that I should run them with the following PSI which is what I'm currently doing:
Front: 42 PSI
Rear: 40 PSI
My concern is that, since I'm able to monitor tire pressures through
the electronic sensors I have, when I'm cruising on the highway they
climb up to 45 PSI in the front and 43 PSI in the rear and I know
according to your website, the max PSI is 51 for these tires and I'm
not comfortable being so close to the max. Please advise as to what
is the proper tire pressures I should be running to keep as close to
OEM specifications due to my up-sizing.
Thank You in Advance.
Raj
Here's the reply:
Response (Carmen) - 11/19/2008 02:26 PM
Dear Raj,
Your email was forwarded to one of our engineers Jose who has the capabilities to calculate the proper pressures for your car and his response is that you air pressures are correct. He states that 42 psi in front and 40 psi in the rear is what you should be using. Should you have any further questions please reference your inquiry number 081118-000010.
Thank you,
Carmen
So the proper tire pressure CONFIRMED from Continental Tires themselves for these tires and wheels is
Front: 42 PSI
Rear: 40 PSI
Someone posted something very similar with the -2 psi difference from front to rear so they were point on.
11-20-2008, 09:46 PM
#28
Team Owner
Also, sorry for the multiple posts, but I jsut checked my email. I emailed Continental Tires since Generals are basically manufactured by them regarding the tire pressure values... here's the email:
Customer (Raj) - 11/18/2008 12:08 PM
Hey I'm writing this email to seek expert advice on proper tire
inflation pressures on my set of General Exclaim UHP that I have on my
vehicle. I can't adhere to my manufacturers recommended tire pressure
posted on the door jam because I up-sized my wheels from the stock
size of 17's to 19's now. I spoke to Carmen yesterday at Customer
Service and was advised to write an email to seek this info. Here is
my vehicle info:
2006 Acura TL (WITHOUT the ASPEC package) Stock size that came with
the car was 17's.
The Wheels that I have upgraded to have the following specifications:
Size: 19
Width: 8.5
Offset: 42
Center bore: 64.1
Bolt Patter: 5x114.3
The tires that I'm running are:
Brand: General Exclaim UHP
Size: 245/35/19 all around
Many people tell me that I should run them with the following PSI which is what I'm currently doing:
Front: 42 PSI
Rear: 40 PSI
My concern is that, since I'm able to monitor tire pressures through
the electronic sensors I have, when I'm cruising on the highway they
climb up to 45 PSI in the front and 43 PSI in the rear and I know
according to your website, the max PSI is 51 for these tires and I'm
not comfortable being so close to the max. Please advise as to what
is the proper tire pressures I should be running to keep as close to
OEM specifications due to my up-sizing.
Thank You in Advance.
Raj
Here's the reply:
Response (Carmen) - 11/19/2008 02:26 PM
Dear Raj,
Your email was forwarded to one of our engineers Jose who has the capabilities to calculate the proper pressures for your car and his response is that you air pressures are correct. He states that 42 psi in front and 40 psi in the rear is what you should be using. Should you have any further questions please reference your inquiry number 081118-000010.
Thank you,
Carmen
So the proper tire pressure CONFIRMED from Continental Tires themselves for these tires and wheels is
Front: 42 PSI
Rear: 40 PSI
Someone posted something very similar with the -2 psi difference from front to rear so they were point on.
Customer (Raj) - 11/18/2008 12:08 PM
Hey I'm writing this email to seek expert advice on proper tire
inflation pressures on my set of General Exclaim UHP that I have on my
vehicle. I can't adhere to my manufacturers recommended tire pressure
posted on the door jam because I up-sized my wheels from the stock
size of 17's to 19's now. I spoke to Carmen yesterday at Customer
Service and was advised to write an email to seek this info. Here is
my vehicle info:
2006 Acura TL (WITHOUT the ASPEC package) Stock size that came with
the car was 17's.
The Wheels that I have upgraded to have the following specifications:
Size: 19
Width: 8.5
Offset: 42
Center bore: 64.1
Bolt Patter: 5x114.3
The tires that I'm running are:
Brand: General Exclaim UHP
Size: 245/35/19 all around
Many people tell me that I should run them with the following PSI which is what I'm currently doing:
Front: 42 PSI
Rear: 40 PSI
My concern is that, since I'm able to monitor tire pressures through
the electronic sensors I have, when I'm cruising on the highway they
climb up to 45 PSI in the front and 43 PSI in the rear and I know
according to your website, the max PSI is 51 for these tires and I'm
not comfortable being so close to the max. Please advise as to what
is the proper tire pressures I should be running to keep as close to
OEM specifications due to my up-sizing.
Thank You in Advance.
Raj
Here's the reply:
Response (Carmen) - 11/19/2008 02:26 PM
Dear Raj,
Your email was forwarded to one of our engineers Jose who has the capabilities to calculate the proper pressures for your car and his response is that you air pressures are correct. He states that 42 psi in front and 40 psi in the rear is what you should be using. Should you have any further questions please reference your inquiry number 081118-000010.
Thank you,
Carmen
So the proper tire pressure CONFIRMED from Continental Tires themselves for these tires and wheels is
Front: 42 PSI
Rear: 40 PSI
Someone posted something very similar with the -2 psi difference from front to rear so they were point on.
I run the exact same pressures in my BFG G-forces that are rated at 45psi max. On the freeway they will hit 45psi.
11-20-2008, 11:13 PM
#29
Woah! Dont do that, each tire differs and this info is specific for the Generals Exclaim UHP. Plus you are saying your max is 45psi and ur running at MAX!? One wrong pothole and your tires will blow, reduce the pressure immediately.
11-20-2008, 11:23 PM
#30
Team Owner
The max pressures are cold pressures. It's fine to exceed it when hot.
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