What tyre pressure are you running?

[thebishman]

The 41 psi liseted by Audi is probably the high limit for sustained high speed driving, and if thte car is fully loaded.

IMHO it makes the car ride quite 'rough', and the tyres are noisy on the interstate.

Anyone tried running slightly lower psi, and if so what are your thoughts on ride, performance, etc.

Bish

[jriddle11]

I have a B7 on 19s and I run 37 psi.

[Zed 2.0]

The 41 psi liseted by Audi is probably the high limit for sustained high speed driving, and if thte car is fully loaded.

IMHO it makes the car ride quite 'rough', and the tyres are noisy on the interstate.

Anyone tried running slightly lower psi, and if so what are your thoughts on ride, performance, etc.

Bish

Where are you seeing 41 psi? Your manual has a chart of tire pressures listed depending on tire size, load and speed. For example, the 255/19s with normal load are 36F/33R.

[obriengp]

34 seems to be best for me.

[Leo]

Where are you seeing 41 psi? Your manual has a chart of tire pressures listed depending on tire size, load and speed. For example, the 255/19s with normal load are 36F/33R.

On Canadian models running 19"s, there is a sticker on B-Pillar, drivers side clearly indicating that 41psi should be used. I'm running 41 psi and have no issues with that pressure. Remember to check your tire pressures regularly (cold tire pressure) especially during seasonal temperature changes.

[Mick4]

On Canadian models running 19"s, there is a sticker on B-Pillar, drivers side clearly indicating that 41psi should be used. I'm running 41 psi and have no issues with that pressure. Remember to check your tire pressures regularly (cold tire pressure) especially during seasonal temperature changes.

Same sticker on US models.

[wwhan]

The Tirerack website lists the Audi 2010 S4 Maximum OEM tire pressure of 50-51 lbs/in^2, depending on the tire manufacturer,
so I guess operation at 41 lbs/in^2 should be just fine.

Maybe tyres take a different pressure level than tires (imperial pounds?)?

[Ynnekdude]

45psi all around.

but that's on an A6...

[decksurgeon]

running factory 255/19inch on the five arm tri-spoke wheels

have tried the lower differeing pressures in the door sticker, feels a bit lumpy here in tropics and 'not sharp'.

now running 2.8 Bar (thats 40.6 PSI folks) all round, car feels great and am leaving it at that.

[machattackii]

On Canadian models running 19"s, there is a sticker on B-Pillar, drivers side clearly indicating that 41psi should be used. I'm running 41 psi and have no issues with that pressure. Remember to check your tire pressures regularly (cold tire pressure) especially during seasonal temperature changes.

Same sticker in my car, 41 psi seems high though, should we be running 41 psi? I have mine at 32 psi

[L0U]

on my 19s ps2 oems, i use 2psi more in the front than the rear. 42,40 is the current numbers I have them filled to.

[HyperM3]

Topic discussed ad nauseam....


245/40 18 - 39 front 35 rear ONLY under full load conditions 41 all around
255/35 19 - 36 front 33 rear ONLY under full load conditions 41 all around

As always check your tire pressure when its cold.

[Blake P]

40 on all 4 corners for me. When in doubt, I'd rather go a little on the high side to avoid bent wheels.

[Seinsmeld13]

Correct pressure is 39r 35r when fully loaded 41 f and r. That is for the 18". Manual as always will tell the correct info, door jamb only lists for fully loaded car which rarely occurs for me.

[L0U]

The tires run hotter the lower the pressure. In the hotter weather I use more pressure. The difference between hot and cold pressures is 10% , so if you are 40 cold and 44 hot, it would be a decent setup. Or 30 cold and 33 hot, but it would more apt to be 35 hot due to the increased tire hot temperatures. My fx45 had the pressure reading in car, so it made finding the right pressures easier in that one. 30 mins of highway speed is enough for a hot reading. At the track the numbers for a street tire are different.

[thebishman]

Topic discussed ad nauseam....


245/40 18 - 39 front 35 rear ONLY under full load conditions 41 all around
255/35 19 - 36 front 33 rear ONLY under full load conditions 41 all around

As always check your tire pressure when its cold.

Please tell me exactly where on the car, or in the manual it states those numbers.
Bish

[HyperM3]

Please tell me exactly where on the car, or in the manual it states those numbers.
Bish

Page 278 for me. Also found it in the index as to what page to look. Seriously I'm amazed here.

[ahcow]

Crap, I am running 41psi all around but my car is never full. Need to adjust it now

[wwhan]

Most cars/trucks, list both the normal and the full load tire pressures inside the door jamb or gas cap cover.
My last three cars did and my wife cars lists, the different load tire pressures.

[rktskicar]

Most cars/trucks, list both the normal and the full load tire pressures inside the door jamb or gas cap cover.
My last three cars did and my wife cars lists, the different load tire pressures.

This one does not though. Only list full load psi on door jamb. Need to look at users manual to see other load conditions.

Bruce

[Seinsmeld13]

This one does not though. Only list full load psi on door jamb. Need to look at users manual to see other load conditions.

Bruce

Ya kinda f$&ky isn't it. I'm sure there will be a mail out for this as running 41 on all four corners will cause premature wear especially to the center of the rear tires. Do I smell a US law suit?

[L0U]

you would need a lot more than 41 to wear the centres off a 35 profile tire that is rated for 186mph. It has more to do with comfort/traction/noise/wear/mpg ratings for the car itself during the testing it undergos. I don't think the 50 max would even cause uneven wear. Any uneven wear I have seen in the last 20 years has been camber related.

ask road and track what pressure they used, or car and driver, or edmunds. bet it was more than 41 on the track time section.

[thebishman]

The law has changed so that on door jams in the future there will be only one psi listed, that being the 'full-load/high speed' #. Reason being is that having two numbers was deemed too difficult for some to understand, and there were cases of owners running the 'lower speed/partial load' psi during high speed conditions, (autobahn/interstate?), resulting in tyre failure. Hence only one number listed now.

Bish

[thebishman]

Page 278 for me. Also found it in the index as to what page to look. Seriously I'm amazed here.

Thanks for the info.

Bish

[wwhan]

But yes, the real reason, to lower the pressure is comfort. The higher full load pressure would generate less heat
on the highway and provide better gas mileage. It obviously handles fine with full load pressure.

[Leo]

Topic discussed ad nauseam....


245/40 18 - 39 front 35 rear ONLY under full load conditions 41 all around
255/35 19 - 36 front 33 rear ONLY under full load conditions 41 all around

As always check your tire pressure when its cold.

The numbers you quote are on my page 264, however..........they are for a 4 CYL 2.0T. My S4 will be a year old next week, they may not have had enough time to update the S4 booklet I got and copied straight from the A4 booklet. Can you confirm that the page you list references tire pressures for a V6 3.0T?

[HyperM3]

The numbers you quote are on my page 264, however..........they are for a 4 CYL 2.0T. My S4 will be a year old next week, they may not have had enough time to update the S4 booklet I got and copied straight from the A4 booklet. Can you confirm that the page you list references tire pressures for a V6 3.0T?

Does it really matter???? If you have the same size tires run those pressures. Do you really think theres that much of a weight difference between the A4 and S4 to all of a sudden be like HOLY SHIT WE GOTTA GET THESE PRESSURES CHANGED IN THE MANUAL QUICKLY OTHERWISE PEOPLE WILL HAVE NO IDEA WHAT TO SET THEIR PRESSURE TO?

No, I dont think so. Im done with this stupidity. Put whatever pressure you want in your tires. Just please, nobody ask about this again. This is like "What kind of gas should I put in the car?".

[Leo]

Does it really matter???? If you have the same size tires run those pressures. Do you really think theres that much of a weight difference between the A4 and S4 to all of a sudden be like HOLY SHIT WE GOTTA GET THESE PRESSURES CHANGED IN THE MANUAL QUICKLY OTHERWISE PEOPLE WILL HAVE NO IDEA WHAT TO SET THEIR PRESSURE TO?

No, I dont think so. Im done with this stupidity. Put whatever pressure you want in your tires. Just please, nobody ask about this again. This is like "What kind of gas should I put in the car?".

Did not mean to offend.

The weight difference is about 500lbs, enough to make a difference in the handling characteristics of the vehicle.

[HyperM3]

Did not mean to offend.

The weight difference is about 500lbs, enough to make a difference in the handling characteristics of the vehicle.

Completely not true, where do you get these numbers from? Just took me 10 seconds to google "Audi A4 weight" and a billion sites came up. Two for instance: Motortrend has the weights as: A4 3626.6 S4 3714.8 and Edmunds has the weights as: A4 3626 S4 3847. Both are Quattro premium w/manual options. At the most theres a 221 weight difference divided by 4 thats 55.25 more over each tire(hypothetically for arguments sake). Still not enough to warrant a whole change in tire pressure concern.

[K1speeder]

I run 40 in the back and 39 in the front on 19" wheels. It is the perfect balance. I have tried having them be the same, the front lower, and the back lower. This give me the most consistent acc., least amount of freeway noise, and is by far the most fun to drive!