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OP, nice ride. I love that color; you will have a lot of fun with it. Good luck.
I am confused about the brake compound tire pressure variance. Although tires in fact, stop ones car, I am not familiar with tire pressures being predicated / dependent on brake lining material. For a full out race car, different story but this is a more complex dynamic system, but for a street and even occasional track day use, I do not see a relationship. Can anyone shed light on this or is the comment a red herring?
OP, nice ride. I love that color; you will have a lot of fun with it. Good luck.
I am confused about the brake compound tire pressure variance. Although tires in fact, stop ones car, I am not familiar with tire pressures being predicated / dependent on brake lining material. For a full out race car, different story but this is a more complex dynamic system, but for a street and even occasional track day use, I do not see a relationship. Can anyone shed light on this or is the comment a red herring?
I've never seen anything about ceramic or steel brakes requiring different air pressures in any of my manuals.
Last edited by JohnEnglish; 04-12-2023 at 12:45 PM.
I've never seen anything about ceramic or steel brakes requiring different air pressures in any of my manuals.
Originally Posted by Unicorn123
Nor have I. Thank you for the confirmation.
While @JohnEnglish 's statement is literally true, it's indirectly not accurate. On page 348 of my MY19 A5/S5/RS5 owner's manual (attached), note (b) states that "... [a] value before the forward slash applies to vehicles with a maximum speed up to 155 mph (250 km/h); the value after the slash is for up to 174 mph (280 km/h)." What vehicles have a maximum speed of 174 mph (280 km/h)? RS5s with Dynamic Plus. What kind of brakes does Dynamic Plus include? Ceramic brakes. Other vehicles limited to 155 mph (250 km/h) have standard steel brakes. So there is a link between tire pressures and brake types, but it depends on the ECU's limit on maximum speed. @Dan99 was correct in a way.
While @JohnEnglish 's statement is literally true, it's indirectly not accurate. On page 348 of my MY19 A5/S5/RS5 owner's manual (attached), note (b) states that "... [a] value before the forward slash applies to vehicles with a maximum speed up to 155 mph (250 km/h); the value after the slash is for up to 174 mph (280 km/h)." What vehicles have a maximum speed of 174 mph (280 km/h)? RS5s with Dynamic Plus. What kind of brakes does Dynamic Plus include? Ceramic brakes. Other vehicles limited to 155 mph (250 km/h) have standard steel brakes. So there is a link between tire pressures and brake types, but it depends on the ECU's limit on maximum speed. @Dan99 was correct in a way.
Not true. Carbon ceramics in Canada are not linked to the increased maximum speed ("Audi Sport" package in Canada). CCB's are a standalone option that you could get on a base RS5.
It's a huge difference with the correct tire pressure. Yes, the RS5 has a soundaktor. It can be turned off (or turned down) with OBD11.
Every time I look at this forum, I learn something new!! I had no idea the RS5 had this. Mine is a 2023 (I see very few changes outside of the touch screen and a few others..) from my MY2019 RS5. Does anyone know if the soundaktor can be shut off in the MMI?
I believe I pulled a fuse from under the drivers footrest on my (pre RS5) MY19 A5 Prestige...
I haven't seen anything referencing different pressures for ceramic vs steel brakes. Where do you see this?
Sorry for the delay in my response. I had a track day yesterday.
Page 348 in my printed and on-line manual...
First column: RS5 Sportback, 275/30 R20 97Y
Top row for 2/3 people says 38/32
Second row says 41/36(b)
(b) says it's for vehicles with maximum speed pf 174, which is only relevant to cars with ceramic brakes, although, I really don't know how this affects cars sold in the Canadian market. Ceramic brakes or not, if your car can go over 155, the recommended tire pressures are different.
We all use our cars differently, so I would like to add some detail around tire pressure. In my case, I like the car to handle well in corners and I also attend a few track-oriented events each year. So, I use slightly modified pressures to improve handling.
The oem Continental SportContact6 tires did well on the street, but not as I became more aggressive in corners. I needed a little more air in the front to reduce sidewall scraping in turns, and used 39/32.
My replacement tires, Michelin PS4S, needed more to avoid sidewall scraping during aggressive cornering. I use 41/35. I tried the 41/36 in the manual for cars with Dynamic Plus (which I don't have) and found that it made the rear end more loose than I like. I use this same setting (41/35) on the street and track. On the street I will set the suspension on Auto, and move to Comfort on bad roads. On the track I use Dynamic.
I arrived at the 41/35 by using the marker on the side of the tires, and confirmed all of this with a pyrometer. All high performance tires have a marker on the sidewall that indicates the maximum amount of sidewall involvement in cornering. On the PS4S tires, the marker is the Michelin Man. Notice the scraping comes to the top of that marker. If scraping goes below the marker, your tires are under-inflated. If the scraping does not reach the top of the marker after aggressive cornering, your tires are over-inflated.
The pressures in the manual will work for most situations, but one size does not fit all. So, my advice is to start with the pressures in the manual, then drive drive through corners however you like to drive and check scraping, then fine tune the pressures as needed. It's also helpful to put some type of marker on the tire for testing. For example, a chalk line by the marker makes it easier to see the impact of a recent change
04-12-2023, 11:41 AM
