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Re: Crippled PTG M3 GT3 (archive)

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Posted by Bill on July 26, 2000 at 12:59:43:

In Reply to: Re: Crippled PTG M3 GT3 posted by Steve_D on July 26, 2000 at 11:28:40:

Thanks for the PTG site info. And of course thanks also for the condescending “examples” (your suppositions) provided.

Tom Milner said, “This was a brand-new car which we had just finished and we had not checked the capacity of the fuel tank.  When we measured the tank, we put fuel-displacement balls in it.  We then had the capacity checked at the gas pumps and it came up to about
three-quarters of a gallon below.” They were measured as having half a gallon too much capacity, and they ended the race with 2 1/2 gallons. So obviously, you can believe whatever you like. That said, what still interests me is how close together these two cars were for two hours, and the fact that once past the Porsche, the BMW finished twenty seconds ahead of the Porsche. Maybe you can find something nice to say about Stuck and the M3?

“Hans Stuck drove the second stint, took the lead at the two-hour mark and crossed the finish line 20 seconds ahead of the second-place Porsche. ”

Bill


-The question of whether a dollop (or a liter, 5 liters or whatever) of ‘extra’ fuel allowed the M3 to have fewer stops seems to be a question apart from this part of the contest.-

Please, do you really believe this? Do I have to explain everything?

Lets say Racer B has 100 gallons of fuel, and Racer P has 95 gallons. Let's also assume Fuel Economy (FE) is roughly equal for both cars.

Another assumption, on 95 gallons of fuel, both cars can run a constant 90% of power (this is endurance racing) and still complete the laps needed to be competitive.

With me so far?

OK, now what do you do with the extra 5 gallons if you are racer B? Well, if the race is long enough you can run at 90% power and maybe save a fuel stop in the long run, which gains you X amount of seconds from not having to pit the extra time. Agreed?

ALTERNATELY, Racer B can run , say, 92% of power for the same number of laps as Racer P. Due to the extra fuel, Racer B has a 2% power advantage everywhere. Thus Racer B walks away from Racer P due to slightly less FE concerns,.

Get it?

A truer "all out" indication of lap times comes in qualifying, where conservation of gas, tires, brakes, etc... are much less part of the equation than the actual endurance event.

Anyway, I don't really care about all this besides the fact it makes interesting discusion, I'm waiting for database updates, and I have time to kill.

I'm waiting to hear back on whether Mark Anderson knows the true overage.





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