Best Tyre Pressure ?

[Johnathan198705]

Hi guys I drive the New M4 F82 AW I currently am using the Michelin Super Sport 19 inch and running 2.5 bar on all four tyres.

What is the best pressure to run on all four tyres I'm trying to see what your guys thoughts are and deduce what's best I personally am happy with 2.5 but would like to know what others are using and happy with for best performance.

[Drizz]

Is that 35psi? I run 32 all around and it works for me. No science behind that though.

[ciaranob]

Originally Posted by Drizz

Is that 35psi? I run 32 all around and it works for me. No science behind that though.

Its 36.3 psi if my converter is correct! I've run between 32-34 psi all round which feels fine - recommended being 33 psi for the 19" wheel/tire combo.

[MrMoo]

No wonder my ride feels so rough, I am running 40 lol

[JTmarlin]

What does factory door panel recommendations state?

[ajag]

Door panel states 32 F/R, been pretty good w/ that so far.

[MyFragileHalogen]

psi changes a lot with temperature, so better include it!

[RJVIII]

32psi cold.

[CanAutM3]

33psi front and 31 psi rear cold.

Note that I am running a 275-295/35R19 PSS setup.

[stranger]

I'm runningb32 front and 34 rear but I'm on 20"

[aboulfad]

So since my FTM came on erroneously and I acquired a nice joes racing tire pressure gauge, I have been checking tire pressure more often. First, if you look inside the drivers door, it recommends for speeds less than 160km/hr to set stock tires both front and rear to 32psi.

I did that in my garage, in the morning, a week ago, and temperature inside the garage was 30C. Fast forward to today, ambient temperature in my garage this morning was 24C and my 4 tires read 31psi on my Joes racing gauge. Rule of thumb is for every 5C there is a change by 1psi.

So at what ambient temp should we set the tire pressure? Wiki returned an interesting chart, kinda indicating saying a reference temp at 24C (75F)... https://en.m.wikipedia.org/wiki/Cold_inflation_pressure

So I decided to set them to 32psi at 24C ant go from there. This is more important in extreme winter conditions where the difference between a heated garage and outside could be up to 5psi. And no I don't race, I am a mild OCD case

[aboulfad]

Originally Posted by Johnathan198705

Hi guys I drive the New M4 F82 AW I currently am using the Michelin Super Sport 19 inch and running 2.5 bar on all four tyres.

What is the best pressure to run on all four tyres I'm trying to see what your guys thoughts are and deduce what's best I personally am happy with 2.5 but would like to know what others are using and happy with for best performance.

2.5 bar is 36psi, BMW recommends 32psi for stock 19". And as you see above I adjusted to 32psi@24Celsius

[Racer20]

Typically automakers fill their tires inside the garage before testing. "Cold" pressure is set at approximately 70F.

[aboulfad]

Originally Posted by Racer20

Typically automakers fill their tires inside the garage before testing. "Cold" pressure is set at approximately 70F.

Good to know so it's pretty close to 75F, only a diff of 0.5psi with the wiki reference. Knowing that and the current ambient temp one could adjust how much air you are pumping in the garage.

So example, if reference OEM pressure is 32 psi@70F, then at 80F one should inflate to 33psi, I.e. Increase/decrease by 1 psi for an increase/decrease of 10F (5 C) in ambient temp. Correct?

[Sahbatage]

Originally Posted by CanAutM3

33psi front and 31 psi rear cold.

Note that I am running a 275-295/35R19 PSS setup.

I have the same tire set-up. When you say cold do you mean at 70 degrees Fahrenheit? Also, what's a better measuring tool, the cars tpms or my standard gauge?

Thank you!

[CanAutM3]

Originally Posted by Sahbatage

I have the same tire set-up. When you say cold do you mean at 70 degrees Fahrenheit? Also, what's a better measuring tool, the cars tpms or my standard gauge?

Thank you!

Cold means whatever ambient is for that time of the year. Hot means after the tires were rather aggressively run (such as right after a track session).

Note that I have since re-adjusted my cold pressures for the 265-295/35R19 PSS. I now use 35psi cold in front and 33psi cold in the rear.

I use a pressure gauge, it is more convenient when inflating the tires. Further, my car does not have TPMS.

[Drift307]

I have the below Wheel setup..
Front: 255 / 35 R19 92 ZR(Y)
Rear: 275 / 35 R19 100 ZR(Y)

When I first had the car all tyres were set to 35 psi all around, I have driven that for a month to begin with.

I've tried a few different psi setups so far, all my tires are Michelin so if you check their web site they suggest running: 35(Front) and 38(Rear).

However My Car manual states different and shows: 34(Front) and 37(Rear)

I have tried all the above and what I have found is that I had more grip and stability when the car tires were set to 35 all around.

I was loosing rear wheel control more with the other settings specially when turning corners,

My suggestion is to stick with 35 psi all around, works well with my tires.

[Aapparition90]

Originally Posted by MrMoo

No wonder my ride feels so rough, I am running 40 lol

You will go through tyres quickly. I am also running low 30s like others on 19's. 33-32 .

[Bahn360Photo]

Originally Posted by MrMoo

No wonder my ride feels so rough, I am running 40 lol

damn!!! you get less traction but more MPG