2012 questions and concerns

fdjizm said:

Checking this out, dude is running very well in that car but I notice not one 1/4 time was shown.
Sup with that?

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He writes in the comments of one of his videos that his average was 13.0@106 and his best was 12.91@106.

Time slips or it never happened


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There is no "industry standard" for 20% driveline loss when trying to estimate crank HP from wheel HP -- unless you're talking an AWD car.

For years, the standard for rear wheel drive cars was 15%. Even that is fishy at this point, because drivelines are much more efficient. The realistic number is probably 12%.

1950StangJump$ said:

There is no "industry standard" for 20% driveline loss when trying to estimate crank HP from wheel HP -- unless you're talking an AWD car.

For years, the standard for rear wheel drive cars was 15%. Even that is fishy at this point, because drivelines are much more efficient. The realistic number is probably 12%.

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Story I got was 12% for the 05-10 manual cars.....and 20% for the 05-10 automatic. And 25% for AWD. 15% for manual 07-14 GT-500's.

It would be pretty straightforward for Ford to measure at the crank...and also at the wheels.

Pentalab said:

Story I got was 12% for the 05-10 manual cars.....and 20% for the 05-10 automatic. And 25% for AWD. 15% for manual 07-14 GT-500's.

It would be pretty straightforward for Ford to measure at the crank...and also at the wheels.

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And as soon as you change one thing (fluid, parts wearing, tires, etc.) The numbers change.

One pet peeve of mine is people quoting supposed crank hp numbers, much less rwhp numbers. Dynos are great tools to dial in a tune but can be manipulated to show any number.


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01yellerCobra said:

And as soon as you change one thing (fluid, parts wearing, tires, etc.) The numbers change.

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Points well taken. I'm talking about oem, new production cars, oem everything, bone stock.
Most of the drive train losses are in the tranny, DS, LSD, ring + pinion gears, axles etc. I divide my rwhp/rwtq by .8 to get crank hp/tq (auto). Then multiply crank hp/tq by .88 to obtain rwhp /rwtq for a manual. The results come out dead on..... with same 2010 cars, same identical mods, same LSD, same rear gear ratio,same fuel/timing /boost/ TB etc. One is an auto, the other an automatic.

VMP + JDM have dyno'd enough cars to predict the expected results between an auto + a manual.... for a given set of mods. VMP has dyno'd 1000's of cars, with every mod you can think of... and can predict the dyno results beforehand with good accuracy.