I coast, a lot.. dunno why, I just happen to like it which is probably why my brake pads need replacing so often as I don't let the engine slow me down. But, question is.. am I saving petrol?
hmm a tough one as repid de-acelleration menas yoru car spits a lot of unburnt petrol out the back i wonder if theres any studies of it /me goes to google
It won't save that much at all - In fact, if you have an automatic tranny, it'll shorten the life of it. The tranny fluid won't circulate and cool down if it's not in gear causing excess heat and friction. It'll be like watercooling your system and relying on convection to circulate your water instead of a pump.
i don't think i've ever left a car go downhill in neutral..... i think it'd gain too much damn speed.... as it is, i try to downshift while going downhills so i don't have to ride the brakes and I'll agree.. only good time to have an automatic is when you're getting a bj in traffic
Well, it's not strictly in neutral.. let's say I'm coming up to traffic lights. Most people will brake, drop through the gears then push the clutch down and roll, I dunno.. 5-10 yards? Usually, if I have enough speed I'll just drop the clutch and roll using the brake to slow me down. My question, I guess, is that if I do this enough am I saving fuel?
I sometimes just let go of the gas when I pull up to a traffic light, and then just brake a little at the end. (I only do this when there are no one behind me). This makes it more fun, I don't have to stand and wait at the lights for so long. I drive an automatic, but it's ok as long as I have it in D and not N?
Yea, that's fine. As long as it's in gear, the fluids will circulate KNA... Technically I would think that you would use less fuel since the engine RPM's are down to idle. However, you would probably spend it replacing brake shoes
Most ECU's now switch off the earth feed to the injectors when the throttle is closed, revs are over 1500rpm & a certain engine temp. Thats what the Haynes Manual says for the Rover 200 1.4l K series engine anyways. So in theroy, when your coasting would use as much petrol as lifting off the clutch. Must admit though, even knowing this, i drop my car into neutral about 1000m before a 30 limit on the way to work (60mph to 30mph limits)
Coasting is fun, but without the gyroscopic effect from the faster spinning flywheel in the engine and the general extra control on speed fluctuations you get from the engine, coasting can be quite a hair raising experience! So what's your longest coast? Mine is 12 miles down a mountain road quite late at night, therefore = no traffice... although it got slightly mundane rolling along at 3mph in some places
my record is coasting at around 103mph going down a huge hill on my way out to ohio through west virginia.... no idea how far I went, but it was fun to try and shift back into 5th when i was going that fast in my truck....
if i hadn't been wearing a seatbelt, i probably would have..... thats when i decided i needed to get a transmission that was geared for higher speeds...
