Re: Transmission options
Quote:
Originally Posted by Ironhydroxide
Well finding Gear ratio's isn't hard. and calculating ratios and speed isn't hard either... SO. I guess i need that Dyno for the Stage 1.
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Even better, I found the original specs which say that peak torque occurs at 4400 RPMs. The stage 1 car on the dyno peaked at 4500-4600 RPMs. If you want that to correspond to, say, 75 MPH it would be a wicked low gear ratio. That would point to the 4.44 being your best option for fuel economy. But, again, I have no idea if it is true.
EDIT:
I'm sick but now you made me go and think. It occured to me that there may have been an assumption I was missing and now I may see the logic behind this claim that peak torque and peak efficiency occur at the same RPMs. Here goes:
Power = Torque * 2 * PI * RPM
Assumption: Rate of air and fuel consumption at a given throttle position is proportional to RPM or Fuel Consumption Rate = constant * RPM. Let's call that FCR.
Power is energy used per unit of time and fuel consumption rate is fuel used per unit of time. Efficiency would be energy obtained for a given amount of fuel so efficiency would be power divided by fuel consumption rate or Efficiency = Power / FCR = (Torque * 2 * PI * RPM)/(Constant * RPM) = Torque * 2 * PI / Constant
So efficiency should be torque multiplied by a constant and should peak when the torque peaks. This has a big assumptin built into it but maybe it makes sense.
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Tony
1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
Last edited by Huskymaniac; 08-30-2011 at 11:54 AM.
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