[Odin]

Drivetrain loss isn't fixed, it fluctuates depending on how much power you're making. Typically drivetrain loss decreases as you get higher up in the power numbers.

 

[shofear]

I second what bluestealth just said. It just doesn't seem right to say my car (for instance) makes 374awhp so that's 500 at the crank. Our cars just can't be loosing that much power, I can see my car closer to 450hp then 500hp. Then again I'm sure the tuners and other folks would much rather embelish that hp # to make things sound that much more impressive.

 

[JRC]

There is two different theories on drive train loss. Some say what you are saying, but personally myself and not being a physics professor, I look at it this way.
Friction multiplied by speed is directly proportunate to the desired time in which to attain that speed so looking at it that way, friction or drive train loss affected by shortened time increases. The people who own the dynos have come to the conclusion that our calculated drive train loss under a 3rd gear pull (depending on the model dyno) is 28% for the AWD models.
In saying that, I also believe the drive train loss varies with each gear, but is also proportunate to throttle position.
In my opinion a somewhat proof of this is the massive amounts of added horsepower to attain just tenths of a second faster times.

 

[obtt]

Talk about getting off track.

 

[sexy95vr4]

I don't think that's the correct way to figure the drive train loss. The HP loss would be a fixed amount wouldn't it, even if you increased your HP? The base flywheel HP is 300, and the AWHP would be 225. That is a 75 HP loss. This number wouldn't change; why would it take more power to power all four wheels if you bolt on more HP? So, you would actually have 366 AWHP and 441 flywheel HP.

you're wrong. so your telling me that a 300AWHP vr-4 and a 700AWHP both gain only 70hp at the flywheel? no. the fixed number isnt a number, its .25X, X being your hp at the wheels. i believe that would be the drivetrain loss if it is 25%.

 

[DarthStimpy]

you're wrong. so your telling me that a 300AWHP vr-4 and a 700AWHP both gain only 70hp at the flywheel? no. the fixed number isnt a number, its .25X, X being your hp at the wheels. i believe that would be the drivetrain loss if it is 25%.

well in reality it's neither.

while drive train loss does increase with additional power (it's not a static XXhp) it does not stay at 25% or what have you.

 

[bluestealth2003]

you're wrong. so your telling me that a 300AWHP vr-4 and a 700AWHP both gain only 70hp at the flywheel? no. the fixed number isnt a number, its .25X, X being your hp at the wheels. i believe that would be the drivetrain loss if it is 25%.

Prove me wrong and I will give you some credibility. I'm not saying that I'm correct either, but my theory seems to be more based on common sense. It seems that it would only take a certain amount of power to drive all four wheels. Based on your formula, that 700 AWHP VR-4 would require 175 HP to drive the wheels. What is the justification for that?

 

[TypicalStateGuy]

Anyways, back on topic:

Just add an ARC-2 (or MAF-T and AFC), some gauges, downpipe, gutted precats, 550s/pump, and a strong clutch, and you should have NO problem running solid 11s. Providing you can drive that is

Shit, I had all the above stuff and ran the times in my sig bouncing off the revlimiter in 3rd on the stock turbos. You should have no problem getting the power you want out those DR-500s. Good luck :bandit:

 

[DomGT]

Of course this isnt an exact calculation, but I use:

30% drivetrain loss for AWD 3/S
25% drivetrain loss for FWD ATX
20% drivetrain loss for FWD MTX