andyc1234
Member
Registered: 7th Nov 06
Location: Lancashire
User status: Offline
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more to do with having lights and heaters and everything on than anything else
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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quote:
Originally posted by Carl
will having the heaters blasting out hot air alot more also effect it?
Yeah, as will heated screens.
My car nearly stalls if I've just started it up, turn on the heated rear screen, heated door mirrors and fan onto 4. It then gets interesting when I have to dry steer to get out a parking space, with EPS 
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Superlite Ltd.
Member
Registered: 9th Jan 07
User status: Offline
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quote:
Originally posted by deano87
quote:
Originally posted by Carl
will having the heaters blasting out hot air alot more also effect it?
Yeah, as will heated screens.
explain that? 
What has more electrical useage got to do with petrol consumption? Your alternator is still using the same amount of drive from the crank as normal. Air-con is different, that uses another belt/pulley to take power from the crank.
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ScottBeck
Member
Registered: 7th Dec 06
Location: Hemel Hempstead, Hertfordshire
User status: Offline
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don't you get more fuel for your tho this time of year as with the cold temperatures the petrol is more dence?
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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quote:
Originally posted by Superlite Ltd.
quote:
Originally posted by deano87
quote:
Originally posted by Carl
will having the heaters blasting out hot air alot more also effect it?
Yeah, as will heated screens.
explain that?
What has more electrical useage got to do with petrol consumption? Your alternator is still using the same amount of drive from the crank as normal. Air-con is different, that uses another belt/pulley to take power from the crank.
Surely the alternator needs to work harder. I heard on here that heated rear screens use a huge amount of power, as opposed to something like a CD player.
My 12v. You switch everything on, all the revs drop, until the engine revs up again, surely this is using more petrol?
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22B
Member
Registered: 9th Sep 04
User status: Offline
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quote:
Originally posted by deano87
quote:
Originally posted by Superlite Ltd.
quote:
Originally posted by deano87
quote:
Originally posted by Carl
will having the heaters blasting out hot air alot more also effect it?
Yeah, as will heated screens.
explain that?
What has more electrical useage got to do with petrol consumption? Your alternator is still using the same amount of drive from the crank as normal. Air-con is different, that uses another belt/pulley to take power from the crank.
Surely the alternator needs to work harder. I heard on here that heated rear screens use a huge amount of power, as opposed to something like a CD player.
My 12v. You switch everything on, all the revs drop, until the engine revs up again, surely this is using more petrol?
Yep all things like using a heated front and rear screen use more fuel, as you are applying a load on the engine, the revs dropping is because of the load you are applying on the engine, the idle control valve does exactly what it says on the tin, basically controls base idle speed when the car is stationary and when a load is being applied it will increase the idle speed so the engine doesn't stall. As soon as you come off the throttle the idle control valve takes over, remember at uni on engine test rigs we would simulate load by squeezing one of the vacuum pipes for a couple of seconds and watch the idle speed increase/decrease.
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whitter45
Member
Registered: 15th Nov 02
Location: Norton
User status: Offline
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quote:
Originally posted by ScottBeck
don't you get more fuel for your tho this time of year as with the cold temperatures the petrol is more dence?
the difference is very small due to the density of petrol
You will not get that much more that you notice it
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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quote:
Originally posted by 22B
Yep all things like using a heated front and rear screen use more fuel, as you are applying a load on the engine, the revs dropping is because of the load you are applying on the engine, the idle control valve does exactly what it says on the tin, basically controls base idle speed when the car is stationary and when a load is being applied it will increase the idle speed so the engine doesn't stall. As soon as you come off the throttle the idle control valve takes over, remember at uni on engine test rigs we would simulate load by squeezing one of the vacuum pipes for a couple of seconds and watch the idle speed increase/decrease.
Knew I was right 
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