Cruise control - weird performance

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devon556
Posts: 52
Joined: Tue Dec 04, 2018 9:19 pm

Cruise control - weird performance

Post by devon556 » Thu Nov 28, 2019 8:21 pm

I don't know whether its actually the car or if some cars I pass suddenly decide to speed up, but i've noticed several times that my seems to have a weird performance issue when on cruise control.

For example coming back from Torquay to Bristol a few weeks ago, Cruise control set to 70mph, and I had to go into the 3rd(fast) lane and was practically tearing past everything in the other two lanes. Over the past week my daily commute which involves a good amount of motorway driving i've noticed one minutes the Corsa want's to tear past everything and then after overtaking 10 or so cars, she seems to go slower, and some cars behind me catch me up and overtake. Given that she only went in for a big service and mot 2 weeks ago and the dealership found nothing I'm thinking it could just be idiots in BMW/Audi's who don't like being overtaken by a nippy little Corsa.

I don't know if anyone else has experienced similar issues or noticed a pattern?
2015 Corsa SE 1.4 90PS Automatic.


TheGeorge
Posts: 80
Joined: Tue Apr 25, 2017 6:26 am

Re: Cruise control - weird performance

Post by TheGeorge » Fri Nov 29, 2019 10:46 am

Run a GPS speedo on your smartphone

Waze has one I believe, otherwise there's a plethora of 'gps test' apps out there that can show you your true speed.
Run the app while you have cruise control activated, just make sure to keep the phone secure and that it doesn't interfere with your drive safety.

My results are that uphill it tends to loose 1 mph on gentle gradients; same downhill, where gains +1 mph. Larger inclines make for other results, but is to be expected.

On flat land it varies again +/-1 mph or less, depending on cross wind.

Note that this is 'steady speed', you will find that car speedo will show you slightly higher speed than the GPS. This is intended by car manufacturers, to make them not liable if you get a speeding ticket. The GPS shows you your true speed.

But overall I think you'll find that the cruise control is working fine, just certain drivers not enjoying being passed over by a corsa :D
Corsa E - 1.4T
MY 2016


devon556
Posts: 52
Joined: Tue Dec 04, 2018 9:19 pm

Re: Cruise control - weird performance

Post by devon556 » Fri Nov 29, 2019 7:44 pm

TheGeorge wrote:
Fri Nov 29, 2019 10:46 am
Run a GPS speedo on your smartphone

Waze has one I believe, otherwise there's a plethora of 'gps test' apps out there that can show you your true speed.
Run the app while you have cruise control activated, just make sure to keep the phone secure and that it doesn't interfere with your drive safety.

My results are that uphill it tends to loose 1 mph on gentle gradients; same downhill, where gains +1 mph. Larger inclines make for other results, but is to be expected.

On flat land it varies again +/-1 mph or less, depending on cross wind.

Note that this is 'steady speed', you will find that car speedo will show you slightly higher speed than the GPS. This is intended by car manufacturers, to make them not liable if you get a speeding ticket. The GPS shows you your true speed.

But overall I think you'll find that the cruise control is working fine, just certain drivers not enjoying being passed over by a corsa :D
Thanks for your help, i'll give it a try and let you know what happens :)
2015 Corsa SE 1.4 90PS Automatic.


Junx
Posts: 37
Joined: Wed Aug 15, 2018 9:47 pm

Re: Cruise control - weird performance

Post by Junx » Fri Nov 29, 2019 10:02 pm

teared everyone up on the M6 the other day, was only going 75.

Felt like I was going 90 at one point but that would get my insurance cancelled.

Cruise was set to 75 for over 40 miles and no issues.


devon556
Posts: 52
Joined: Tue Dec 04, 2018 9:19 pm

Re: Cruise control - weird performance

Post by devon556 » Sat Nov 30, 2019 10:02 am

Junx wrote:
Fri Nov 29, 2019 10:02 pm
teared everyone up on the M6 the other day, was only going 75.

Felt like I was going 90 at one point but that would get my insurance cancelled.

Cruise was set to 75 for over 40 miles and no issues.
:D The speed limit is only 70 though
2015 Corsa SE 1.4 90PS Automatic.


Rickardo
Posts: 278
Joined: Thu Jan 26, 2017 1:23 pm

Re: Cruise control - weird performance

Post by Rickardo » Sat Nov 30, 2019 11:14 am

74 is 70 if you use GPS


Junx
Posts: 37
Joined: Wed Aug 15, 2018 9:47 pm

Re: Cruise control - weird performance

Post by Junx » Sun Dec 01, 2019 11:25 am

devon556 wrote:
Sat Nov 30, 2019 10:02 am
Junx wrote:
Fri Nov 29, 2019 10:02 pm
teared everyone up on the M6 the other day, was only going 75.

Felt like I was going 90 at one point but that would get my insurance cancelled.

Cruise was set to 75 for over 40 miles and no issues.
:D The speed limit is only 70 though
ur allowed 10%


Marksparks
Posts: 70
Joined: Sun Feb 03, 2019 4:43 pm

Re: Cruise control - weird performance

Post by Marksparks » Mon Dec 02, 2019 5:52 pm

ur allowed 10%

Incorrect... the general rule of thumb is that Safety Camera units are set at 10%+2, however this is not national, and whilst a Police Officer may have discretion, the automated safety camera systems do not.

They pick up speed data, what they fail to capture is poor driving.


devon556
Posts: 52
Joined: Tue Dec 04, 2018 9:19 pm

Re: Cruise control - weird performance

Post by devon556 » Wed Dec 04, 2019 8:24 pm

Marksparks wrote:
Mon Dec 02, 2019 5:52 pm
ur allowed 10%

Incorrect... the general rule of thumb is that Safety Camera units are set at 10%+2, however this is not national, and whilst a Police Officer may have discretion, the automated safety camera systems do not.

They pick up speed data, what they fail to capture is poor driving.
In practice the 10% rule is actually rubbish and doesn't exist, if a police officer wants to pull you over for doing 31 in a 30 they can, most don't because it's too much paperwork.
2015 Corsa SE 1.4 90PS Automatic.


Junx
Posts: 37
Joined: Wed Aug 15, 2018 9:47 pm

Re: Cruise control - weird performance

Post by Junx » Sat Dec 07, 2019 8:26 pm

devon556 wrote:
Wed Dec 04, 2019 8:24 pm
Marksparks wrote:
Mon Dec 02, 2019 5:52 pm
ur allowed 10%

Incorrect... the general rule of thumb is that Safety Camera units are set at 10%+2, however this is not national, and whilst a Police Officer may have discretion, the automated safety camera systems do not.

They pick up speed data, what they fail to capture is poor driving.
In practice the 10% rule is actually rubbish and doesn't exist, if a police officer wants to pull you over for doing 31 in a 30 they can, most don't because it's too much paperwork.
Its not law but its policy.

No copper will ever do you if your under 10%

Its policy because you can easily beat it in court with several excuses such as speedo not correct etc


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