Tyre sizes - Including asbuilt Calculator

Thu Jan 10, 2019 1:11 pm

I may get the PCM relearn thrown back in for this model vehicle.

Original it was added when we were testing wheel size change on the Ranger, F150, 6 and 10 speed. In the end it functioned correctly on the 10 speed F150 but nothing else and any tyre size could be used. I will get it back to try on the 2.0 10 speed and let you know when ready to test.

Thu Jan 10, 2019 1:42 pm

Wazza-c12 wrote: ↑Wed Jan 09, 2019 2:30 pm Further to my previous post, a GPS test puts the speedo within 1% of actual - so if I increase to the max figure of "0977" the speedo should read about 3% over which is great.

The same GPS test puts the odometer reading approx 5% lower than actual, based on that intel, any suggestion as to what I should change to current PCM 0933 value to?

Cheers

Waz

Hi Waz, see this post viewtopic.php?f=12&t=214&p=7440#p7440 that you have here.

Thinky · Sun Jan 13, 2019 1:39 am

My original as built value was 0938 not 0936. It was an ex-demo with 2000km when I bought it. Does this mean someone had already changed it?

Tezza · Mon Jan 14, 2019 11:03 pm

Hi All

Just pulled the trigger on some new rubber for the Everest (2017 Trend)
Going from stock 265/60/18 to 265/65/18 AT’s

I know I need to change from
xxxx 0934 xxxx to
xxxx 0977 xxxx in the BCM.
Is there anything else I need to do / change?

Will also be putting in new tyre pressure sensors (new genuine ones from Ford) and I have the learning tool from the US. I will follow the instructions to activate via Forscan and set up once the tyres are on. I also have a scangauge, so will program the xgauges to get pressure readings.

Fingers crossed

Cheers

Tezza · Wed Jan 16, 2019 9:48 pm

Ok so update for those interested.

New tyres are on and change successfully made in Forscan. Mine was “934” and I have changed this to “977” so far with no issues.

I tested the speed prior to fitting the new tyres (the reading was 4km/h out) after fitting the tyres (the speedo was 0.5 - 1km/h out) and after changing to 977 in Forscan which bought it back exactly where it was before (4km/h out) so it looks to be successful in my case.

I also installed the new tyre pressure sensors, activated the two areas in forscan and programmed them with the learning tool. This was also super easy and worked well.

Lastly, I programmed in the xgauges in the scangauge and this also was a success. I know have pressure readings. While I won’t display these all the time (there are more important things to display on the scangauge) it’s good to know I can flick to them at any time if required.

sharky · Sat Feb 16, 2019 1:35 am

Shane_2 wrote: ↑Fri Sep 21, 2018 7:30 pm
saeb wrote:
Shane_2 wrote: ↑Wed Sep 19, 2018 3:43 pm Hey just like to get a bit more detail in what to change in PCM for adjusting the odo. I gather BCM and 0977 for auto to change the speedo? I'm running 285/70 R17 Mickey Thompson ATZ.

Is there any other new info or updates to consider changing?

Sent from my SM-G965F using Tapatalk
Yes that is correct 0977 is the highest you can go for the auto. It will be better than what it was.
Yes I have already completed that part of it and I am smack on the money gps 100kmh speedo 100kmh that's all good.

I want to know what I need to change in PCM to get the odo to be correct too.

Sent from my SM-G965F using Tapatalk

Hi Stewart, just to clarify...
I'm in the same boat and have the same 285/70/17 ATZP3 tyres on my auto ranger wildtrak. I have had the BCM changed to 0977 for a while now and 100kms speedo is 100kms GPS which is great. Now, by changing the PCM from the original 7E0-01-01 xxxx-5C08-xxxx to the 6298, you're saying that if I travel 10kms using a GPS app on my phone, then my car odometer should also say that I've travelled 10kms too?
Reason I ask is because I have just done this and taken the car for a drive and the GPS app has said I've travelled 5.5kms and my car odometer only said I had travelled 5kms. The speedo is still correct as before and both showing the same speed.
Is this right or have I done something wrong?

Thanks for all the help

Sat Feb 16, 2019 9:39 am

From what I understand, the speedo and odometer will never both read correctly as there is a % 'margin' built into the firmware for the speedo dial display to comply with ADRs.

So if your speedo is reading correctly then your odo will be out, or vice versa. However, the speed reported by an ultragauge, scangauge or forscan will be different as that will not have the 'margin' applied to it and is what the car uses for dte calculations and the like.

I've set mine so all the calcs are correct, but unfortunately this means my speedo still reads high.

rusty-pie · Fri Feb 22, 2019 9:14 pm

saeb wrote: ↑Wed May 30, 2018 5:49 pm So it appears that the IPC pulls the odometer value from the PCM.

Changing just the BCM will not affect the odometer then (speed and odometer 2 different things ), the change that will help keep the odometer correct needs to be made in line 7E0-01-01 of the PCM where tyre size is.

Ideally PCM and BCM should be changed.

Hi Stewart, I was wondering if you recommend to change the bmc and pcm to the same Tyre size when the wheels are larger that the size corresponding to 0977, ie both pcm and bcm to the “0977” size (I know the pcm field actual value would be different from 0977, but you know what I mean), or better to have the real size in the pcm and 0977 in the bcm?

Sun Feb 24, 2019 7:12 pm

I usually just do the BCM, I only ever changed the PCM on occasion and the only reason I mentioned it originally was after reading some service material.

0977 to dec is 2423 x 10 = 24230 to hex is 5EA6

Try the standard value in the PCM and do a run to check ODO then change it to 5EA6 and see if there is any difference.

If you feel there was a difference with the odometer then give me your true tyre size and I will give you a different value.

rusty-pie · Mon Feb 25, 2019 11:08 am

saeb wrote: ↑Sun Feb 24, 2019 7:12 pm I usually just do the BCM, I only ever changed the PCM on occasion and the only reason I mentioned it originally was after reading some service material.

0977 to dec is 2423 x 10 = 24230 to hex is 5EA6

Try the standard value in the PCM and do a run to check ODO then change it to 5EA6 and see if there is any difference.

If you feel there was a difference with the odometer then give me your true tyre size and I will give you a different value.

Cheers, I’ll try that. You have given me already the value for my size 285/65/18, 6234.

Tue Feb 26, 2019 6:58 am

Wazza-c12 wrote: ↑Wed Jan 09, 2019 5:00 pm My apologies for the repeated messages.

Ive just had my first attempt at making edits to MY19 Everest Trend, and it was a fail unfortunately

Changed
BCM 726-12-01 = 0977
After an ignition restart the car threw DTC P160A (indicator)
Clearing it did not resolve the DTC
A relearn PCM option that I have seen mentioned in other threads does not appear for me in forscan

Then tried to change
PCM 7E0-01-01 = 60AE (which I convinced myself was the correct value for 275/65/18)
When attempting to write this I got the following error "Writing blocks failed - incompatible configuration"

I then changed the BCM back to factory, cleared the codes and gave up for the day

Any feedback appreciated.

Cheers
Waz

Have you had a chance to try the PCM relearn and see what happens, I have not had feed back from anyone as yet to see if it will resolve the issue on MY19. Try BCM edit only, try relearn and see what happens.

biohazard69 · Mon Mar 11, 2019 9:34 am

hello I tell you, I'm from Chile and I follow their modifications by forscan, my truck I made a change of profile of Tyres and Tyres I did the calculation with the link of google Tyre calculator and I throw the code to modify it in the boxes that mention but I throw the error and accept, from that moment the check engine turned on in my vehicle. Can somebody help me?? My vehicle is in Kilometers not in miles

Mon Mar 11, 2019 12:28 pm

biohazard69 wrote: ↑Mon Mar 11, 2019 9:34 am hello I tell you, I'm from Chile and I follow their modifications by forscan, my truck I made a change of profile of Tyres and Tyres I did the calculation with the link of google Tyre calculator and I throw the code to modify it in the boxes that mention but I throw the error and accept, from that moment the check engine turned on in my vehicle. Can somebody help me?? My vehicle is in Kilometers not in miles

Do a search. 0977 is the maximum without errors on a Ranger or Everest. On base models this can be lower again.

NathanSA · Thu Apr 04, 2019 7:41 pm

Hi Stewart,

I had a look at my BCM value:
726-12-01-013B 0910 51E6
Doesn't this 0910 = 2320mm circumference?

My Tyres are factory standard 255/70 R16 which should be 2398mm therefore 095E for BCM?

Not sure if I should change this or not?
I have been trying to get my consumption figures correct...

Speedo is about 5km/h out at 120km/h.
Speedo = 125km/h, GPS = 120km/h

Thanks

Thu Apr 04, 2019 9:53 pm

NathanSA wrote: ↑Thu Apr 04, 2019 7:41 pm Hi Stewart,

I had a look at my BCM value:
726-12-01-013B 0910 51E6
Doesn't this 0910 = 2320mm circumference?

My Tyres are factory standard 255/70 R16 which should be 2398mm therefore 095E for BCM?

Not sure if I should change this or not?
I have been trying to get my consumption figures correct...

Speedo is about 5km/h out at 120km/h.
Speedo = 125km/h, GPS = 120km/h

Thanks

It is meant to be this way or DTE will also be wrong, ODO will be wrong and and and.............................. 4% from factory is correct. Ford do not need millions of drivers spamming them because they got a fine a 101 in a 100 zone. This is by design.

What are the fuel figures on the cluster vs. properly calculated fuel figures?

NathanSA · Thu Apr 04, 2019 11:15 pm

Was thinking that the 4% would be fine, however, as you saw in the other thread regarding AFE Bias, my consumption is off.

I'm 0.3l/100 off on a standard tank with DTE warning on at 80km with a fill up taking only about 66l.
That's 14l lost somewhere!
And yet the vehicle is over optimistic on the consumption figures...

Saw in a Forscan post someone worked out that the value to put in the BCM is about 96.7% of the tyre circumference.
This works out to my current BCM value of 2320mm. 96.7% of 2398mm (255/70 R16) is roughly 2318mm...
So not sure why consumption is off.

My Vehicle Tracker device (anti theft) GPS distance log matches my odometer reading. Well, off by 30km but that's nothing over 3300km...
So it seems the odo should be correct along with current tyre size.
This is why the AFE bias caught my eye...

me too · Fri Apr 05, 2019 2:35 pm

saeb wrote: ↑Sat Jul 08, 2017 7:31 pm New tyres so best I sort it.

Maximum size in hex in the BCM the Ranger will take before throwing PCM and TCM codes is 0977.

Standard XLT 265/65 R17 circumference is approx 2438mm

MT ATZ P3 at 265/70 R17 circumferance is approx 2519mm

What a massive difference.

Hex in BCM 726-12-01 xxxx-XXXX-xx was 0936 and I have changed to the maximum 0977.

0936 = 2438 265/65 R17 Factory Tyre
0977 = 2505 265/69 R17 - Non existent but closest we will get
0987 = 2520 265/70 R17 - Fault codes

So I have gained back 67mm and only fell 15mm short.

265/65 R17 410 Revolutions per kilometre
265/69 R17 399 Revolutions per kilometre
265/70 R17 396 Revolutions per kilometre

All in all I will probably pull back 2 of the 3 kph lost by putting lager tyres on and my DTE will be very close to what it should be. Also it will get even more accurate as the tyres wear down.

So if you have 265/70 or even 285's then max it out to 0977 as it will still be an improvement to your DTE and ODO. Imagine over 100k running larger tyres and no changes your car would actually be lying about how many kilometres it has travelled.

Good luck all.

Hi Saeb,
I am trying to adjust the tiresize in my 2015 BT50 but unfortunately I can not find the entry 726-12-01 under BCM.
The values I see are between 726-01-xx to 726-02-xx.
Does that mean I cant change it at all or do I need to get deeper in the guts of the software?
Cheers
Mike

Fri Apr 05, 2019 5:32 pm

Me too, you cannot change your tyre size, well you can but they will already be at the maximum size.

Please see this thread for what you can and cannot do on a PX1 viewtopic.php?f=12&t=1213

Please do not touch the as-built data on a PX1.

me too · Sun Apr 07, 2019 9:58 am

saeb wrote: ↑Fri Apr 05, 2019 5:32 pm Me too, you cannot change your tyre size, well you can but they will already be at the maximum size.

Please see this thread for what you can and cannot do on a PX1 viewtopic.php?f=12&t=1213

Please do not touch the as-built data on a PX1.

Thanks for that info.
Is the value set to the maximum by default?
But why can I not see it in forescan as an editable option?
I read the thread viewtopic.php?f=12&t=1213, hence my question a.
It it doesn't show up under forescan at all.
I am using the latest version and the extended license
Cheers
Mike

Waynder · Mon Apr 15, 2019 3:17 pm

Just upgraded to ZOkohamas Gelonader 33s...

There is still no way to change size that much?

Mon Apr 15, 2019 8:28 pm

me too wrote: ↑Sun Apr 07, 2019 9:58 am
saeb wrote: ↑Fri Apr 05, 2019 5:32 pm Me too, you cannot change your tyre size, well you can but they will already be at the maximum size.

Please see this thread for what you can and cannot do on a PX1 viewtopic.php?f=12&t=1213

Please do not touch the as-built data on a PX1.
Thanks for that info.
Is the value set to the maximum by default?
But why can I not see it in forescan as an editable option?
I read the thread viewtopic.php?f=12&t=1213, hence my question a.
It it doesn't show up under forescan at all.
I am using the latest version and the extended license
Cheers
Mike

Please post a screen shot of the asbuilt screen in Forscan.

Mon Apr 15, 2019 8:29 pm

Waynder wrote: ↑Mon Apr 15, 2019 3:17 pm Just upgraded to ZOkohamas Gelonader 33s...

There is still no way to change size that much?

32 Inch approx max 0977.

Mon Apr 15, 2019 8:31 pm

Stewart, does the manual transmission model still allow a bit more, up to 0987 (from memory)?

Mon Apr 15, 2019 8:35 pm

GerryP wrote: ↑Mon Apr 15, 2019 8:31 pm Stewart, does the manual transmission model still allow a bit more, up to 0987 (from memory)?

Some yes, some no. I have still had DTC on some and is why I do not push it higher just because of the time involved with rectify the issue, whether it be by messages or getting the vehicle to go for drives between testing.

Happy for anyone with a manual to test though.

me too · Mon Apr 29, 2019 6:40 pm

saeb wrote: ↑Mon Apr 15, 2019 8:28 pm
me too wrote: ↑Sun Apr 07, 2019 9:58 am
saeb wrote: ↑Fri Apr 05, 2019 5:32 pm Me too, you cannot change your tyre size, well you can but they will already be at the maximum size.

Please see this thread for what you can and cannot do on a PX1 viewtopic.php?f=12&t=1213

Please do not touch the as-built data on a PX1.
Thanks for that info.
Is the value set to the maximum by default?
But why can I not see it in forescan as an editable option?
I read the thread viewtopic.php?f=12&t=1213, hence my question a.
It it doesn't show up under forescan at all.
I am using the latest version and the extended license
Cheers
Mike
Please post a screen shot of the asbuilt screen in Forscan.

I just realized that my post from before Easter doesn't appear yet.
So second try...
I still cant do direct forescan screenshots (some computer gremlins) but the attached screen shots are the as build data which are the same entries like what I can see in forscan.
Any thoughts why I am not being able to see the Tyres size entries?
Cheers
Mike

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