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Thread: Cruise control on GSi auto wants to speed up.

  1. #1
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default Cruise control on GSi auto wants to speed up.

    Now my understanding of cruise control is that it maintains a set speed regardless of changes in road - on the flat, uphill, downhill.

    So today, on a nice gentle bit of dual carriageway, set the cruise to 50mph. Sat there for about a mile on the flat and then the road starts to go downhill. Not a steep hill, just a gentle gradient over about 2 miles.

    Realised the car now is not maintaining 50mph, something like 55mph. So I carry on down hill, still on the cruise but watching the speedo - 55, 60, 65, 70. Then I switch the thing off (surprised it came on when asked in the first place!).

    Is this "normal" behaviour because I sure ain't had this before on my previous motors (Octavia, Peugeot 406, Volvo 760) ?

  2. #2
    Regular Member Karl's Avatar
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    if the hill is steep enough the car would increase speed in the same manner as if you were driving off the cc (I assume with your foot OFF the gas)
    Never noticed mine increase that much down a hill though.....

  3. #3
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default

    Quote Originally Posted by Karl View Post
    if the hill is steep enough the car would increase speed in the same manner as if you were driving off the cc (I assume with your foot OFF the gas)
    Never noticed mine increase that much down a hill though.....
    I can see your point Karl. What I might try is the same road, no cruise and lift off from 50 mph as the hill starts to go down and see if we still pick up speed. I guess it will but to what degree?

  4. #4
    Regular Member parapaul's Avatar
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    You're right, and there's nothing wrong with your CC. The CC cannot apply any braking force, so on a downhill gradient you will pick up speed.

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