Cruise Control speed setting 1 mph out.

Faults and Technical chat for the Mazda CX-3
Posts: 83
Joined: Fri Jan 20, 2017 11:20 am
Location: N Ireland

Re: Cruise Control speed setting 1 mph out.

Post by Gordongilchrist » Wed May 16, 2018 5:24 pm

santa wrote:
Wed May 16, 2018 5:04 pm
Strangways wrote:
Wed May 16, 2018 2:54 pm
Santa, I don't know what spec the Optimum is, but I would guess it has 16" wheels. All the people who say there HUD is showing 1mph faster have 18" wheels. The difference in the overall circumference is 1" bigger on an 18" wheel. If the speedo has been based on revolutions of the 16" wheel then the car will actually be travelling faster if it is on 18" wheels. 70 mph on the 16" wheels will equate to 70.8 mph on 18" wheels.
Has that solved it or did I guess wrong on your wheel size?
The Optimum here in Scandinavia is the top spec with 18" wheels and there is No difference with My 16" winter wheels.
My Cruise control is spot on, only going up and down hills, will the speedo go over or under the set speed and pretty quickly find the correct speed again.
That's why I thought it might be the miles conversion that does it.
And the speedo is quite precise compared to the gps: 80 kmh on GPS is 82 kmh on the speedo/HUD on 18" wheels, on My 16" wheels it's more like 83/84 on speedo is 80 kmh on GPS.
No it's not related to tyre size. Mine is always 1mph over setting on cruise control. Either doing 40mph r 80mph. It is software related IMO. Can't understand why some are different to others tho. That's just strange.
2017 Mazda CX-3 sport nav 2WD Automatic 120 petrol in white :)

Posts: 546
Joined: Mon Feb 06, 2017 10:35 pm
Location: Edenbridge Kent

Re: Cruise Control speed setting 1 mph out.

Post by Strangways » Wed May 16, 2018 6:40 pm

It is 1 mph, it really doesn't matter, there are far more serious things to worry about in this life. I don't know why I'm even writing this, what has this site done to me :? I was never OCD before I joined :(
CX-3 2.0 Sport Nav+ Automatic in ETERNAL BLUE
MX-5 2.0 Sport Nav Manual in SOUL RED

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