S2000 in the INdy 500. Hypothetical
Joined: May 2001
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From: Nowhere
Originally Posted by S2k-Takara,Jun 21 2007, 10:34 PM
You mean leanest 
I dont know about you guys, but going down 5 at 100+ I get 30+ mpg.
Also, our engine creates less drag as the rpms increase.
I dont know about you guys, but going down 5 at 100+ I get 30+ mpg.Also, our engine creates less drag as the rpms increase.
As for the reduced drag, I suggest a physics class.
Thread Starter
Joined: Jul 2001
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From: This is not my house!
I may be confused S2k-T... You're saying you get 30mph going 100mph (and more) in 5th gear? I'm afraid I don't believe your numbers.
... and Billy is right about drag. You've got that wrong too.
... and Billy is right about drag. You've got that wrong too.
Joined: May 2001
Posts: 93,305
Likes: 820
From: Nowhere
I'm still not sure about the fuel assumptions, notably 2 stops... 
IMS: 2.5 miles, 100% duty cycle, approximately 1 minute/lap (150 MPH)
LS: 2.24 miles, 70% duty cycle, approximately 2 minutes/lap (67 MPH)(10 MPG)
70% is an estimate based on my Forza playing (my only empirical data point
). I didn't figure on load, even though it's much easier to accelerate in 2nd or 3rd than it is in 6th, mainly because I'm lazy and math is hard.
So (very) roughly speaking, on-duty fuel consumption is 10 gallons/hr below 100 MPH. That works out to be about 35 gallons for the Indy 500 (slightly better than 13 MPG, actually) assuming 140+ average speed. If you put in the load factor (more drag @140+ vs 60-100) it would probably slide up to 40-45 gallons.
Realistically that is at least 3 stops. You're not going to run the car on vapors so I'd say you get 12 gallons usable. In the end a small change, I guess. And lots of wasted brain power.
IMS: 2.5 miles, 100% duty cycle, approximately 1 minute/lap (150 MPH)
LS: 2.24 miles, 70% duty cycle, approximately 2 minutes/lap (67 MPH)(10 MPG)
70% is an estimate based on my Forza playing (my only empirical data point
). I didn't figure on load, even though it's much easier to accelerate in 2nd or 3rd than it is in 6th, mainly because I'm lazy and math is hard. So (very) roughly speaking, on-duty fuel consumption is 10 gallons/hr below 100 MPH. That works out to be about 35 gallons for the Indy 500 (slightly better than 13 MPG, actually) assuming 140+ average speed. If you put in the load factor (more drag @140+ vs 60-100) it would probably slide up to 40-45 gallons.
Realistically that is at least 3 stops. You're not going to run the car on vapors so I'd say you get 12 gallons usable. In the end a small change, I guess. And lots of wasted brain power.
Joined: May 2001
Posts: 93,305
Likes: 820
From: Nowhere
Originally Posted by jedwards,Jun 22 2007, 08:18 AM
I may be confused S2k-T... You're saying you get 30mph going 100mph (and more) in 5th gear? I'm afraid I don't believe your numbers.
... and Billy is right about drag. You've got that wrong too.
... and Billy is right about drag. You've got that wrong too.
Joined: Jun 2002
Posts: 111,885
Likes: 2,035
From: SoCal
Originally Posted by WestSideBilly,Jun 22 2007, 08:32 AM
I'm still not sure about the fuel assumptions, notably 2 stops...
IMS: 2.5 miles, 100% duty cycle, approximately 1 minute/lap (150 MPH)
LS: 2.24 miles, 70% duty cycle, approximately 2 minutes/lap (67 MPH)(10 MPG)
70% is an estimate based on my Forza playing (my only empirical data point ). I didn't figure on load, even though it's much easier to accelerate in 2nd or 3rd than it is in 6th, mainly because I'm lazy and math is hard.
So (very) roughly speaking, on-duty fuel consumption is 10 gallons/hr below 100 MPH. That works out to be about 35 gallons for the Indy 500 (slightly better than 13 MPG, actually) assuming 140+ average speed. If you put in the load factor (more drag @140+ vs 60-100) it would probably slide up to 40-45 gallons.
Realistically that is at least 3 stops. You're not going to run the car on vapors so I'd say you get 12 gallons usable. In the end a small change, I guess. And lots of wasted brain power.
IMS: 2.5 miles, 100% duty cycle, approximately 1 minute/lap (150 MPH)
LS: 2.24 miles, 70% duty cycle, approximately 2 minutes/lap (67 MPH)(10 MPG)
70% is an estimate based on my Forza playing (my only empirical data point
). I didn't figure on load, even though it's much easier to accelerate in 2nd or 3rd than it is in 6th, mainly because I'm lazy and math is hard. So (very) roughly speaking, on-duty fuel consumption is 10 gallons/hr below 100 MPH. That works out to be about 35 gallons for the Indy 500 (slightly better than 13 MPG, actually) assuming 140+ average speed. If you put in the load factor (more drag @140+ vs 60-100) it would probably slide up to 40-45 gallons.
Realistically that is at least 3 stops. You're not going to run the car on vapors so I'd say you get 12 gallons usable. In the end a small change, I guess. And lots of wasted brain power.
