downshifting use fuel?

[DezzDash]

just wondering, in my manual sv6 if im going at 70 and downshift from 3rd to second to get the growl, does it use fuel as the rpm's go higher?

[josh_scott_1987]

some people should not have a car. think about it mate. yes it would the more your motor works the more fuel u use's

[maldotcom2]

Actually higher revs doesn't necessarily mean more fuel. Since the engine is being used as a brake during the downshift little to no fuel is being pumped in. I know the VS actually shuts off the injectors.

[theSeekerr]

No, the downshift doesn't use extra fuel, assuming you shift "normally" and let the clutch do the work (and don't continue to drive in that gear - obviously, maintaining that higher RPM will use more fuel). If you respect your car, you'll use the extra bit of fuel to match the revs and ease the load on your clutch.

[DezzDash]

haha thanks guys, apparently the first post shouldnt have a car, not knowing what ur going on about champion

[svsex]

yeh i actualy saw a doco on being green in ur car and they did say using ur gears to slow down does improve fuel ecocnomy and sounds fully sik wen u have a exaust sytem fitted haha.

[VzVzVz]

No fuel is being used in that situation, because the rear wheels are driving the engine when no throttle is being used. The best thing to do when rolling to a stop is to go to a lower gear and don't touch the pedals. let your momentum drive the engine

[f1tzy]

some people should not have a car. think about it mate. yes it would the more your motor works the more fuel u use's

Yep you should be one of them. As long as the throttle isn't blipped it won't use more fuel. Even if you did blip the throttle the fuel usage increase would be miniscule

[v6lux]

How about we just answer the question with where the TPS is at?

The TPS is controlled by the accelerator pedal, so if you are not pushing it, then no more fuel than to maintain engine IDLE is being asked for! I could be wrong, so corrections welcome!

[dbarnes]

the throttle body isn't going to be open so no you're not using more fuel

[DezzDash]

awesome thats so good to hear. cheers boys

[gslrallysport]

just wondering, in my manual sv6 if im going at 70 and downshift from 3rd to second to get the growl, does it use fuel as the rpm's go higher?

If you're not using the throttle to match the revs, then the motor will use no more fuel than any other normal deceleration...

Having said that you SHOULDN'T be using the engine to slow the car down to that degree. Helical cut gears are only designed to transfer load in one direct, that is, acceleration. Using the gears to slow the car down to that degree transfers load onto them in a manner for which they weren't entirely designed for. It's ok to blip the throttle in a heel and toe, and match the revs in the lower half of the rev range in a bid to grab a lower gear, because by blipping the throttle you haven't transferred that shock through the teeth.. It's also ok to grab a lower gear without blipping the throttle provided you're low enough in the rev range, and release the clutch out with some degree of mechanical sympathy.

But grabbing 2nd whilst doing 70 and bringing the revs up by dropping the clutch is doing nothing but wearing out your gearbox... Golden rule when I teach people to drive, is Gears are for going, brakes are for slowing! I'm not just saying that as someone who sells brakes pads, but as an advanced driving instructor (but circuit and rally)... Use your brakes to slow the car down, then grab the correct gear at the latest possible point before entry into a corner. Or in the case of straight line deceleration, at the lowest point possible in the rev range.

If you really are only doing it for the growl, and give no toss for the wear and tear on your gearbox... go nuts! Or install straight cut gears...

some people should not have a car. think about it mate. yes it would the more your motor works the more fuel u use's

I was going to write something harsh, but I think you get the message!

[sik_dose]

some people should not have a car. think about it mate. yes it would the more your motor works the more fuel u use's

HAHAHAHA! why dont you think about it mate. the throttle is closed, only idle air is geting into the engine, the engine can only burn as much fuel as air volume permits. lol you should not have a car, like the majority of 17 year old female red P platers who just think an engine is a magical thing that goes vroom.

[Jesterarts]

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