What Psi/Bar pressure with CSL's?

[Philly_Sweden]

I have CSL's with 235/35/19 and 265/30/19.

I currently have 44 psi (3.0 bar) and was recommended that from the tire shop.

What do you guys find the ultimate pressure?

Many members on the Swedish boards have way way less.

I don't track or race, just cruise.

Z4 M with H&R springs.

Thanks!

/Filip

 

[srhutch]

That's very high. I have 2.2 bar from memory, whatever is in the door jam.

 

[Lillywhite]

That's very high.

Ridiculously high. :thumbsdown:

 

[Philly_Sweden]

That's very high. I have 2.2 bar from memory, whatever is in the door jam.

Well the door jam is with OEM 18".

 

[mmm-five]

That's very high. I have 2.2 bar from memory, whatever is in the door jam.

Well the door jam is with OEM 18".

The weight of the car hasn't changed so why do you think you'll need more pressure in the tyres?

 

[inkey$]

BMW on standard 19s:
33 front
35 rear

 

[GP06Roadster]

32/34

 

[tomscott]

Should be 35 all round. But I put about 32-33

 

[inkey$]

Just posted a link to BMW tyre pressures but no 19s listed so you may want to replicate Tom et al.

http://www.puretyre.co.uk/bmw-tyre-pressures/

 

[Beedub]

bmw called for 35psi all round on the actual CSL. if its good enough for that car.... its definitely good enough for us.

 

[dgm]

My preferred pressures in these sizes is 33psi rear, 32psi front. Can't see anything wrong with a bit of experimentation around the low to mid 30s. 44psi is way off.

 

[DONDP]

Yep, 35psi when cold for the road. When on track with michelin PSS/PS2 I aim for 40 psi hot...

 

[mj2k]

35psi, would this be the same for a non M? Can't find a decent pressure for my Vreds presently.

 

[Franzino]

bmw called for 35psi all round on the actual CSL. if its good enough for that car.... its definitely good enough for us.

That's 100% correct… and this is the case for the CSL.
On the street I drive with 2.3 bar front and 2.4 bar rear. On track with very hot tyres I have them on 2.25 bar front and 2.35 bar rear for a little bit more grip. It was advised by Michelin tech people to keep a 0.1 bar difference between front and rear for optimal grip and balance with the 19" Michelin Supersports. Anything above 2.4 bar (35psi) is IMO to much pressure and makes the car slide more (hot tyres on track) so I keep the pressure on 35psi or slightly below this.

 

[Philly_Sweden]

Just emptied some air 2,6 front and 2,8 rear. Damn the car was hard earlier

 

[exdos]

On the street I drive with 2.3 bar front and 2.4 bar rear. On track with very hot tyres I have them on 2.25 bar front and 2.35 bar rear for a little bit more grip. It was advised by Michelin tech people to keep a 0.1 bar difference between front and rear for optimal grip and balance with the 19" Michelin Supersports. Anything above 2.4 bar (35psi) is IMO to much pressure and makes the car slide more (hot tyres on track) so I keep the pressure on 35psi or slightly below this.

Franzino, I'm with you on this. When I took my car to The Ring for the first time last year, I started out with my "Fast road" suspension settings and tyre pressures, to see how they performed when I could properly push the car to its/my limits. With the recommended cold tyre pressures the car would slide and squeal when the tyres got up to working temperature, but when I let some air out so that I was running the recommended pressures when the tyres were hot, I found that the grip considerably increased and the squealing stopped. I found that these pressures equated to 2 bar cold all round.


"

 

[Bigpow]

I've got h&r's and 19" csl reps with 32 to 34 psi. Feel perfect to me . Lots of poor surfaces in west wales worst luck but lots of awesome roads as well .

 

[Franzino]

Franzino, I'm with you on this. When I took my car to The Ring for the first time last year, I started out with my "Fast road" suspension settings and tyre pressures, to see how they performed when I could properly push the car to its/my limits.

What are the suspension settings that you used when driving the ring. I'm going tomorrow for the first time to the ring with my Bilstein PSS-10 fitted.

 

[exdos]

Franzino, I'm with you on this. When I took my car to The Ring for the first time last year, I started out with my "Fast road" suspension settings and tyre pressures, to see how they performed when I could properly push the car to its/my limits.

What are the suspension settings that you used when driving the ring. I'm going tomorrow for the first time to the ring with my Bilstein PSS-10 fitted.

There are 9 settings on the dampers on my ACS suspension. I settled at position 2 at the front and 3 at the rear (0 = hardest) with the tyre pressures at 2.2bar front and 2.35bar rear when hot with the OEM Conti M3 tyres. If I'd had longer I would have experimented with slightly stiffer settings.

 

[Franzino]

You advised me to put the rear a little softer then the front... I now have 5 for front and 4 for rear on my PSS-10 (1 = soft / 10 = hard). I'm going to experiment with 5/4 & 5/5 & 5/6... Harder then 5 or 6 seems to hard for the ring.