- 11,660
- GTP_Orido
Who are you quoting? Race gas vs 91 octane consistently adds 10 hp? In what cars? You can use a bloody million octane fuel in a car tuned to run 91 and it won't add anything. Octane rating is just a measurement of a fuel's knock resistance. Unless you're changing the tune on a car, using higher octane fuel than the car has been tuned for makes no difference other than costing more.
This reminds me of a friend of mine who was convinced he could "feel the difference" in his crappy old Commodore when he ran 98RON premium in it lol.
For the quote, you can read here : http://f80.bimmerpost.com/forums/showpost.php?p=16459929&postcount=11
Also read here :
http://f80.bimmerpost.com/forums/showpost.php?p=16517925&postcount=190
"I believe that there is a lot of misinterpretation of the term "drivetrain" losses in the discussion here (and in general). By definition, drivetrain losses are the losses incurred by friction in the transmission, bearings, differential and CV joints. However tire drag and slip losses, engine ancillary losses and inertial effects should not be included in drivetrain losses.
10% pure drivetrain loss is not an unreasonable number IMO. Looking at the Rototest results, I found drivetrain losses to be in the 6-10% range. Add to this tire drag and inertial effects and the difference between crank power and WHP can easily reach 15-18%. But that 15-18% is more than just "drivetrain" losses."
Interesting discussion there
I wonder what your friend would say if he drive Commodore or Falcon running on gas like the taxis
There's also aftermarket solutions to allow storing of multiple maps, and change of mapping at user discretion ( been in a car that can change maps using cruise control switch )
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