Tyre Pressures

[Kenny]

Check all tyre pressures when they are cold, at least once every two weeks. Check them after the vehicle has been parked for at least three hours. Tire pressure can diminish over time and fluctuate with temperature. Do not reduce the tire pressure of warm tyres.

 

Recommended Pressures

 

Tyre Size	Normal Load		Full Load
	Front	Rear	Front	Rear
	bar	bar	bar	bar
235/35 R19	2.8 bar (41psi)	2.6 bar (38psi)	3.2 bar (46psi)	3.2 bar (46spi)

 

The recommended tyre inflation pressures are on the tire information label on the driver side B-pillar.

Note: Do not exceed a cold tire pressure of 3.4 bar for track use.

[J J]

Has anyone tried different tyre pressures to turn factory norm? Would be interesting to have some comparison s … Thanks

[PerfectlyPeter]

Last weekend I drove 35kms at a track day with tyre pressures set to the normal load recommendations of 41 and 38 psi  My tyre retailer expert told me that the pressure would have increased on the track to at least 45 psi. Inspecting the tyres he noticed that there was virtually no wear on the shoulders indicating that the tyres became over-inflated. For track use he suggested starting out at 37, 34  psi. The track I raced on was a very tight 1.2 km circuit.

 

[Kenny]

Thanks for the advice Peter.

Did you enjoy the track day?

[bobcat]

@Peter, thats in line with what I’ve read elsewhere and have been told. Reduce the tyre pressure down by 2psi all round as a minimum. Depending on the track short tight circuit down 2psi, long straight circuit down by 3psi?

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Honorary Member

 

[PerfectlyPeter]

Thanks for asking, Bobcat.  It was enjoyable after my being a bit apprehensive to begin with. Put me in a competitive situation and I tend to over-drive a car, brake late and hard which is not the fastest way around a track. But first time out I avoided that, kept quite calm, and to my pleasant surprise more than kept up with an M3 and some version or other of a turbo 911.  I switched to track mode and also found the stiff damper setting was good except for exiting slow bumpy corners when oversteering became twitchy rather than progressive.

[John Bovard]

Here in North America, I was told by my dealer legislation requires TPMS system to be set to 46PSI with a tolerance of 4-6 PSI.  So the TPMS low pressure warning light comes on below 39 PSI.  And the dealer is prohibited from adjusting the threshold downwards.  I wanted to run 37F, 35R on my daily driver setup (265/35ZR18 Michelin PSS)  for a vastly improved ride. So I need to find an unscrupulous mechanic with a scan tool to adjust the BCM downwards.

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2017 Z06/Z07 Coupe Admiral Blue – 7Manual
2002 Silverado 1500 LT Z71 4×4 Stepside Indigo Blue
2017 Escape Titanium Lightning Blue
2016 Focus RS Nitrous Blue:    ordered: Jan 10, built: Sept 9, shipped from plant: Sept 27,  shipped Rhea Leader: Oct 25,

  arrived Halifax: Nov 12,  delivered Vancouver Island: Nov 28, 2016

JacobZ06

Vancouver Island, British Columbia

[Emmett Hedigan]

I have had the exact same issue.  It happened firstly when I was driving pretty quickly on Irish back roads (we still have some great ones left).  I was shocked by how loose the whole front end / steering had become.   Ignored it and forgot about it until the next time and it has happened several times since.  I have a Golf R too in a car pool with some friends and it never ever did anything like this in fact no performance car I have ever driven has done this.  Going to try my tire pressures now, then go for a burn later.  Hope it works.

[white-rs2]

When I was introduced to the track, many many years ago (either racing or track days for fun) I was informed to always reduce tyre pressure by some 3-6 psi on standard, due to the heat build up and the water moisture in the air within the tyre expanding.

🙂

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RS Edition.

FPM375 Rocks

The rest of the “M” maps suck

[white-rs2]

@John Bovard

Hope this helps

To reset your TPMS sensors without a tool:
1. Make sure your tires are inflated to the recommended psi. 36psi.
2. Turn ignition to the on position. If you have a push button start, push the start button without pressing the brake pedal.
3. Push the hazard light button 6 times. The horn should honk and you should see “Train left front tire” in the LCD display between the tach and speedo.
4. Release air pressure in the front left tire until you hear the horn honk. The LCD display should now read “Train right front tire”.
5. Release air pressure in the right front tire until you hear the horn honk.
6. Repeat for the the right rear tire, and then the left rear tire.
7. You should now see “Training Complete” in the LCD display.
8. Fill your tires back up to the recommended pressure.

To Disable:
This disables TMPS. This is helpful in the winter when the cold makes your system think it has a flat when it doesn’t, or when you purchase new wheels that don’t have TMPS sensors. The procedure for this is almost the same as the DIY for Global Windows Open/Close except you change a different variable in FoCCCus.
See:
KeyFob Windows Up/Down

Follow all the same steps except for step 10.
At step 10 change the value in #101 to Without Monitoring System
TPMS disable

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RS Edition.

FPM375 Rocks

The rest of the “M” maps suck

[John Bovard]

That should work and I will try it.  But have you discovered where the TPMS threshold parameters live in the body control module?

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2017 Z06/Z07 Coupe Admiral Blue – 7Manual
2002 Silverado 1500 LT Z71 4×4 Stepside Indigo Blue
2017 Escape Titanium Lightning Blue
2016 Focus RS Nitrous Blue:    ordered: Jan 10, built: Sept 9, shipped from plant: Sept 27,  shipped Rhea Leader: Oct 25,

  arrived Halifax: Nov 12,  delivered Vancouver Island: Nov 28, 2016

JacobZ06

Vancouver Island, British Columbia

[white-rs2]

@JohnBovard

Sorry no luck on the confirmed TPMS threshold, it possibly could be the setting PSI of 36

But to get around this, just disable the function and if in the future it’s needed re-enable it.

🙂

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RS Edition.

FPM375 Rocks

The rest of the “M” maps suck

[John Bovard]

Disabled the TPMS.  Seems confirmed by the absence of any TPMS dash lights after running for 30 min at up to 120K.  Also, my TPMS app no longer shows tire pressures so the data is no longer  being fed into the OBD II bus.  This is good enough until I find the threshold parameter I was looking for.

 

Thanks white-rs2.

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2017 Z06/Z07 Coupe Admiral Blue – 7Manual
2002 Silverado 1500 LT Z71 4×4 Stepside Indigo Blue
2017 Escape Titanium Lightning Blue
2016 Focus RS Nitrous Blue:    ordered: Jan 10, built: Sept 9, shipped from plant: Sept 27,  shipped Rhea Leader: Oct 25,

  arrived Halifax: Nov 12,  delivered Vancouver Island: Nov 28, 2016

JacobZ06

Vancouver Island, British Columbia

[Emmett Hedigan]

I checked the tyre pressures and they were very high as you all suggested.   Front 47 + 49psi with 47 + 48psi Rear, way too hard.

I took the car for a spin afterwards and the ride was much more comfortable at low speeds and the norm at high speeds however Ford have a real issue with this car.  The steering just goes so light and waves at around 80mph especially as your going through the gears.   It happens around 3800 rpm in third or more in fourth.  It does not happen in 5th or 6th, don’t think so.   It could be linked to the turbo boost when it kicks in.  My guess is it must be linked to the electronic steering (it does have one???) and the software controlling the power to the wheels.    Ford really need to get this solved as its dangerous on back roads.

 

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