high RPM coasting?

ES_TRADER · 10-17-2010, 02:12 PM

Just a general question im curious to know about...i dont know much about mechanics or how an engine works but if u hold the car at a higher RPM, BUT DONT, step on the gas, say, if u going downhill coasting or something, does it burn fuel just as if you were stepping on the gas?

common sense tells me more rpm = more gas...but if u dont put on the accelerator, wouldnt it just be the same as taking your foot off the gas in any gear? be it 1,2 or 5 6?

thx

MasterDank · 10-17-2010, 02:20 PM

Throttle position has alot to do with injector %.. So no throttle means very little fuel but rpm does also change it a little, so you will use more gas at higher rpm with same throttle position.. Using the gears to slow the car is fine/correct.

Alex

Radiation Joe · 10-17-2010, 02:29 PM

I believe zero throttle = zero fuel if above something like 1200 rpm.

CarForHire · 10-17-2010, 04:39 PM

Like when you downshift into second gear, engine screaming as you come to a stop with no throtttle?

JCtx · 10-17-2010, 06:22 PM

Quote:

Originally Posted by Radiation Joe

I believe zero throttle = zero fuel if above something like 1200 rpm.

That's correct. Engines driven in that fashion are more likely to burn oil, rather than fuel, due to high vacuum.

10-17-2010, 02:12 PM	#1
ES_TRADER Colonel 344 Rep 2,928 Posts Drives: 328i, 335i, M3, 535i, X5, 36M Join Date: Oct 2010 Location: OC iTrader: (3) Garage List 2014 Ford Raptor [0.00] 2012 328i E92 [10.00] 2013 X5 [0.00] 2013 335i F30 [8.00] 1990 Toyota Previa [0.00] 1997 E36 M3 [10.00] 2011 E92 M3 [0.00] 2011 535i [0.00]	high RPM coasting? Just a general question im curious to know about...i dont know much about mechanics or how an engine works but if u hold the car at a higher RPM, BUT DONT, step on the gas, say, if u going downhill coasting or something, does it burn fuel just as if you were stepping on the gas? common sense tells me more rpm = more gas...but if u dont put on the accelerator, wouldnt it just be the same as taking your foot off the gas in any gear? be it 1,2 or 5 6? thx
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10-17-2010, 02:20 PM	#2
MasterDank Boats & Hoes 21 Rep 345 Posts Drives: 13 F10 M5 Sakhir Orang,Chohiba Join Date: Apr 2010 Location: K-Town HI iTrader: (0)	Throttle position has alot to do with injector %.. So no throttle means very little fuel but rpm does also change it a little, so you will use more gas at higher rpm with same throttle position.. Using the gears to slow the car is fine/correct. Alex
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10-17-2010, 02:29 PM	#3
Radiation Joe Veni Vidi Vici 89 Rep 2,750 Posts Drives: '11 JB/BBe-6sp-e90 Join Date: Jul 2008 Location: Macungie PA iTrader: (0) Garage List 2011 e90 M3-Sold [8.50] 2003 RS6 - Sold [0.00] 2009 e90 M3 - Gone [0.00] 2003 M3 SOLD [0.00] old 2002 [10.00]	I believe zero throttle = zero fuel if above something like 1200 rpm. __________________ Dinan compliment of stuff plus PF rotors and RG63s. Enough for now. Why, yes. I am an abrasive bastard.
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10-17-2010, 04:39 PM	#4
CarForHire Major 29 Rep 1,309 Posts Drives: Slow in the left lane. Join Date: Nov 2009 Location: NOVA iTrader: (0) Garage List 2007 E90 328i [0.00]	Like when you downshift into second gear, engine screaming as you come to a stop with no throtttle? __________________ Race car driving is like sex...all men think they are good at it. - Jay Leno
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