RE: boosted Gas Mileage, wow
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RE: boosted Gas Mileage, wow - 11/16/2005 11:28:16 PM
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sacicons
Posts: 7674
Joined: 6/26/2004
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well, the auto probably helps in that department.
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Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.
quote:
ORIGINAL: Forty04
I choose the rear ending
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RE: boosted Gas Mileage, wow - 11/17/2005 4:38:55 AM
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yamahaSHO
Posts: 177
Joined: 10/23/2005
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quote:
ORIGINAL: sacicons
anything other than displacement that adds power does so by increasing the efficiency of the motor, so if you are using the more powerful motor approximately the same as you would have used the less powerful motor, then mileage should go up. notice he said he wasnt grannying it either, but he didnt say he was driving noticeable harder than norrmal either. hell, if he did granny it, hed probably break 50 mpg.
This doesn't make sense. Regardless of the power adder, it still takes X amount of power to move the car X amount if speed. You still are using the same motor to get the same work done. During cruising speeds, you shouldn't even see boost. If you were comparing a larger, heavier motor to that of the boosted Civic motor making the same power where the added weight of the blower does not overcome what the added weight of a bigger motor would be, then you could probably compare gas mileage figures.
Boosted cars sometimes get good/better gas mileage because the compressors heat up the air which helps atomize the fuel better. Once you start hitting boost, you require more fuel which will not increase mileage.
Between Phoenix and Denver I got a best of 31-32 mpg on my stock SHO. Once I put a Vortech supercharger on, my milage went to 26 mpg @ 80-85 mph and 24 @ 100+ mph. Obviously, as you go faster you work with more drag. Much of the loss in gas mileage was due to my foot and the richer tuning during engine deceleration.
< Message edited by yamahaSHO -- 11/18/2005 3:55:50 AM >
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Jason
2002 Honda Civic EX Coupe
1995 Taurus SHO
www.cardomain.com/id/yamahasho
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RE: boosted Gas Mileage, wow - 11/17/2005 9:11:33 AM
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sacicons
Posts: 7674
Joined: 6/26/2004
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but comparing a smaller boosted motor with a larger one that weighs the same doesnt work out in favor of the larger motor, because a boosted engine (usually) has higher VE, which will make more power, while wasting less. and im thinking your mileage went down partly because it was boosted previously, so you are probably messing with the VE of your stock motor, and its probably running pretty rich, esp with a supercharger, which runs kinda hot anyway, so it would need to run a little rich if you raised the boost, unless you had water/alcohol injection or something similar to lower intake temps. a turbo can raise the VE even more, since it is using wasted exhaust gas heat to compress the air, instead of the crankshaft.
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Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.
quote:
ORIGINAL: Forty04
I choose the rear ending
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RE: boosted Gas Mileage, wow - 11/17/2005 9:28:56 AM
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yamahaSHO
Posts: 177
Joined: 10/23/2005
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The smaller engine and larger engine in comparison would not weigh the same. The supercharger would not make up the missing weight you would find in a larger engine. Both motors, small and large, at 50 hp are burning approximately the same amount of air:fuel.
Also, my motor was orginally normally aspirated. I later added a supercharger with 11 PSI. Even if I was boosted stock, adding more boost would only burn more fuel under higher boost pressures as MORE air is making it into the motor. I DO have water injection, 2-stage to be exact, but it is not activated until you see boost. The first stage is at 4 PSI and the second is activated at 8 PSI. Regardless, cruising would not be affected.
Under cruise conditions, the engine does NOT need to run any richer. The extra heat created under little to no load is not enough to cause detonation at part throttle. If anything, the extra heat will help atomize the fuel better.
VE does not refer to the parasitic loss through being run off a crank versus exhuast driven. If you look at the definition of VE, you'll find it says nothing about parasitic loss. It is about how much air you can get into the cylinders.
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Volumetric Efficiency
The ratio of air inducted per cycle to the total displacement of the engine. Commonly referred to as the engine's ability to "breathe."
< Message edited by yamahaSHO -- 11/17/2005 9:39:36 AM >
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Jason
2002 Honda Civic EX Coupe
1995 Taurus SHO
www.cardomain.com/id/yamahasho
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RE: boosted Gas Mileage, wow - 11/20/2005 8:11:39 AM
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luke6450
Posts: 245
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can anyone convert 42 mpg to km/lt
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RE: boosted Gas Mileage, wow - 11/20/2005 2:13:04 PM
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Pete
Posts: 7169
Joined: 2/28/2005
From: Jersey
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quote:
ORIGINAL: XCM828
. What kind of gas mileage do you think I'll get on the highway with the turbo?
its insane man, youll be amazed.
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1994 Civic coupe. B18C, A few Bolt Ons.
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RE: boosted Gas Mileage, wow - 11/21/2005 1:10:27 AM
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sacicons
Posts: 7674
Joined: 6/26/2004
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quote:
ORIGINAL: luke6450
can anyone convert 42 mpg to km/lt
about 18.5.
_____________________________
Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.
quote:
ORIGINAL: Forty04
I choose the rear ending
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