As above really, will it hurt the haldex to free wheel down hills occasionally?
I know your not supposed to do it as you're not in full control of the car etc
just wondered
As most have said, it will no effect your haldex at all.
But I wanted to inform you that if the point of you free wheeling down the hill is to save fuel, then leave the car in gear and let it roll down with engine braking. Because the fuel injectors will switch off and use no fuel for you anyways, whilst keeping control of your car.
As most have said, it will no effect your haldex at all.
But I wanted to inform you that if the point of you free wheeling down the hill is to save fuel, then leave the car in gear and let it roll down with engine braking. Because the fuel injectors will switch off and use no fuel for you anyways, whilst keeping control of your car.
Surely if the injectors switch off and you are using no fuel why doesn't the engine stop firing?
Surely if the injectors switch off and you are using no fuel why doesn't the engine stop firing?
Surely if the injectors switch off and you are using no fuel why doesn't the engine stop firing?
Does it still demand fuel while using the gear box to brake if you have the foot off the pedal??
Think how a car works... Engine fires, turns the crank, which turns the gearbox, which turns the wheels.
If you let off the loud pedal when rolling down hill BUT STILL IN GEAR, you essentially reverse this... The wheels turn, the gearbox turns and the engine turns, but doesn't fire because the injectors turn off when your engine is on what is called "over-run". The engine doesn't stall because the injectors cut back in either when you press the accelerator or when the engine speed drops to just above idle speed (about 1200 rpm) So you save loads in fuel.
Next time you're going down hill, reset your MPG meter and it wont register anything... Because you're doing about a billion light years to the gallon
Oh and just in case you were wondering, on the over-run, the spark plugs DO still fire. It's only the injectors that cut off.
Hope this clears up any confusion
Ben
I'm not so sure everone here is right about the original question..... A bold statement I know but in the S3 manual it says if the car is being towed, it must not exceed 30mph as it may cause damage to the 4wd system. Don't shoot the messenger mind, I have no idea why it could hurt but Audi says it does.