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Can you run 2 hours balls to the walls on a tank?


Can you run 2 hours balls to the walls on a tank?  

44 members have voted

  1. 1. Can you run 2 hours balls to the walls on a tank?

    • No problemo
      23
    • Some tracks, I slow down when AFR hits 19 and engine goes PING
      5
    • Fuel starvation after one hour with plenty gas left
      2
    • Does it look like I drive a Prius?
      14


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We're really sweating it if it goes green the whole way.   If that happens we are forced to 1 hour 55 minutes max for a margin of safety.   Still have our low fuel light working and it reads proper on straights.   So we have about a lap to a lap and a half warning depending on track length.   

 

We like a caution or two for ease of mind.  

 

 

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Yes, and with a factory Honda tank!  The caveat being we have been 10-15 seconds off-pace and spend less time at WOT than a lot of folks and don't push quite as hard as others might due to our current tires and their lack of grip.  And our engine, though a swap, is bone stock.

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90 minutes tops at 6k rpm. 5k rpm maybe 1 hour 40 minutes.

304 V8. Mild cam, Edlebrock carb and airgap intake. Gt40p heads. We are installing F.I. Hopefully this will help some..

 

17 gallon fuel cell in a Mustang.  The 4.0 liter supercharger will help with our fuel consumption.  :ph34r::huh:;)

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IMO Daytona is the biggest test since the car is at WOT for so long. 

This year, one of our fast drivers ran a full session with very few (any?) cautions and I think no FCY and we put ~17 gallons in the stock 300ZX tank and had no cavitation. We finished 6th overall. 

Our 2nd car seems to be burning ~5.2 gallons per hour running it at probably 85-90% on an open track at Sebring with zero traffic. However, at ~10 gallons I noticed the car hitch in T17 so we are going to put a piece of Hydramat in it. That's on a stock Mazda 626 tank. 

S. 

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It all depends no a lot of factors. The driver and track. Some track, yes. Some tracks, hecksss no.

 

Bad fuel tracks when green the hole time

Road America -like they ever fcy

VIR- purple flag helps

WGI- funny, thinking you would get a stint without fcy, good one

Road Atlanta- give or take

PIRC old configuration- new, depends on how you drive

 

Medium and Easy tracks on fuel

AMP

 

 

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On 8/18/2017 at 3:34 PM, DRVOLKS said:

I run a diesel VW TDI as it is setup now  we can run on a stock tank 4.45 HR to a stock  tank !!  Please don t get mad at me it took 3 years of testing to get there.

I still need to finish a full week end with out and long delays of fixing stupid  parts that should not break !

Bob Mann

www.DRVOLKS.com

bobtec@comcast.net

drvolkslogo.jpgtdtuninglogo.jpg

1_53.jpg

 

4 hours? Wow!

 Is a diesel more efficient at WOT as well and why?

What is the weight of the car, hp estimate and fuel capacity? 

 

 

So generally what is the best way to conserve fuel? Limit to only 80% throttle or something? 

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2 hours ago, turbogrill said:

Is a diesel more efficient at WOT as well and why?

Thermodynamics... you can do some reading on the differences between the "otto cycle" and the "diesel cycle". "Carnot cycle" is also good reading so you can understand the 'ideal'.

Diesel also often burns less fuel because they simply make less power than the gasoline engine which would otherwise be put into that chassis.

 

That diesel VW beetle may be going 4 hours on fuel, but is it competitive on lap times?

 

Quote

So generally what is the best way to conserve fuel? Limit to only 80% throttle or something?

That would definitely conserve fuel but at the cost of big performance losses. You want to shoot for a balance of less fuel used combined with not much less performance. In racing it is often better to stay full throttle but shift at a lower RPM. ICEs near redline are not operating in their optimal thermodynamic efficiency range... by short shifting at full throttle you are getting closer to the higher efficiency sweetspot.

Edited by enginerd
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1 hour ago, turbogrill said:

 

So generally what is the best way to conserve fuel? Limit to only 80% throttle or something? 

 

Absolutely, I recommend this for everyone and it will greatly reduce your racing costs as well.^_^

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We are pulling laps at Thompson with 100 car on it at 1.30.115 to 133.200 so we where 20th over all fastest lap  of 115 cars and 5th in B class. we weigh 2700 LB race ready.

tank is 14.7 GAL we run it in 3th and 4th for that track. HP is Ok Torque 300+ all in at 1800 RPM this took a lot of broken parts to get here and we still are having parts just fall off!!

here it is in side vid 

 

 

 

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