Do you coast your IS-F (Throw in Neutral)?
04-21-17, 06:24 PM
#1
Do you coast your IS-F (Throw in Neutral)?
I was wondering if anyone coasts their IS-F? Coming from cars that were either Manual or SMG, the IS-F is the first actual Automatic car that I've owned.
There are long stretches of highway that are hills where I live (over a mile) and I want to know if it's bad for the transmission to throw it into neutral then pop back in drive (or even try to rev match then put it in drive).
Any insight would be appreciated as I want this car to last but coasting definitely helps the car's efficiency.
There are long stretches of highway that are hills where I live (over a mile) and I want to know if it's bad for the transmission to throw it into neutral then pop back in drive (or even try to rev match then put it in drive).
Any insight would be appreciated as I want this car to last but coasting definitely helps the car's efficiency.
04-21-17, 07:53 PM
#2
Coasting in neutral doesn't actually help the cars efficiency, it still uses fuel to idle the engine. The greatest efficiency comes from coasting down a hill in gear (i.e. like engine braking), engines use 0 fuel when this is happening - if you don't believe me, take a ride in a car that has an A/F readout, and you'll see. Alternatively, look at your live mileage indicator on the dash. Not only are you saving fuel, but if you downshift to the right gear, you're also saving brakes. Ergo, coasting in a low gear is your max efficiency mode - anyone can step in here and prove me wrong if you have a better idea!
There's no advantage to coasting in an AT car. Also, you'll be putting more wear than necessary on your (expensive) brakes.
There's no advantage to coasting in an AT car. Also, you'll be putting more wear than necessary on your (expensive) brakes.
Last edited by cjblair; 04-21-17 at 08:46 PM.
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JohnMorgan (04-22-17)
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JohnMorgan (04-22-17)
04-22-17, 12:32 AM
#4
Cruise control- I've done on long stretches where I'm not familiar with the area or just want to not worry about speeding or drawing attention. But I've never thrown the car into neutral for the reason that if I ever needed to accelerate or maneuver the car using more speed or precision, that slight delay to throw it into DRIVE will be invaluable. That and I'm pretty sure it jerks the car a little bit, which, while these transmissions can take a beating, probably isn't the best approach to just coast around and save some gas.
04-22-17, 03:00 AM
#5
LOL. This sounds like what people used to do in the 70s to try to save gas
.
As as I understand it, when in gear and coasting the injectors are off and no gas is being used. When in neutral gas is being used constantly. Seems like you have it backwards.
.As as I understand it, when in gear and coasting the injectors are off and no gas is being used. When in neutral gas is being used constantly. Seems like you have it backwards.
Last edited by Jz39; 04-22-17 at 03:05 AM.
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chrisp1 (04-22-17)
04-22-17, 07:40 AM
#7
I obviously wouldn't do it on ISF, but some manufacturers have this as EcoMode feature, Automatic transmission jumps to neutral at certain conditions
Last edited by kolyan; 04-22-17 at 09:52 AM.
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04-22-17, 11:10 AM
#10
Intermediate
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chrisp1 (04-22-17)
04-22-17, 07:53 PM
#11
Thank you I did not know this about Autos, like I said I come from Manual / SMG's so this is a whole new world for me.
I had an E60 M5 that I would average about 23 MPG in with full bolt ons (499.7 WHP). With how much driving I do efficiency is something to consider when the tank is so small and I need range. I'm not complaining about the mileage, just asking how to maximize it.
I can't stand it when people are telling others to sell their car because it doesn't fit one facet of their desires, sell the F and get a prius? That's insane.
Coasting in neutral doesn't actually help the cars efficiency, it still uses fuel to idle the engine. The greatest efficiency comes from coasting down a hill in gear (i.e. like engine braking), engines use 0 fuel when this is happening - if you don't believe me, take a ride in a car that has an A/F readout, and you'll see. Alternatively, look at your live mileage indicator on the dash. Not only are you saving fuel, but if you downshift to the right gear, you're also saving brakes. Ergo, coasting in a low gear is your max efficiency mode - anyone can step in here and prove me wrong if you have a better idea!
There's no advantage to coasting in an AT car. Also, you'll be putting more wear than necessary on your (expensive) brakes.
There's no advantage to coasting in an AT car. Also, you'll be putting more wear than necessary on your (expensive) brakes.
I can't stand it when people are telling others to sell their car because it doesn't fit one facet of their desires, sell the F and get a prius? That's insane.
04-22-17, 09:18 PM
#12
If you're looking to maximize mileage (which is completely legitimate, no need to get a prius lol), the same advice applies to any car - doesn't matter if it's manual, auto, smg, dct, dsg, etc etc etc - coasting down a hill while you're in gear and operating under engine braking conditions be more efficient than coasting in neutral.
04-22-17, 10:44 PM
#15
Why can't someone want a car that has great performance capability, and also appreciate getting good mileage when they're not driving the nuts off it? The guy went to great lengths to get a car in a spec that we should all appreciate as fellow car guys. Don't be a d*ck.
Last edited by cjblair; 04-22-17 at 10:55 PM.
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supersonic (04-23-17)