BruceH

......

Nuke

Correct. Any type of Forced Induction.

Conn337

yeah im thinking its about 330 flywheel.. then around 270-290 at the wheel for a 4.6L.

breathegood

IMO the standard formula is crap, but everyone continues to estimate hp this way. There has got to be a better way to estimate drivetrain loss. I realize that not everyone does a baseline dyno, but using a percentage just doesn't seem right to me. This says that the more power you make, the more power you lose through the drivetrain. I just don't think it works that way.

Example:

Lets just say a stock '05-'09 GT has 300bhp. Using .85 (15% drivetrain loss) translates to 255whp. Actuall loss is 45hp. Seems a tad steep, but this is just an example.

Without changing anything else, lets put a turbo on it (parasitic loss of a S/C is an added variable that we won't be introducing here) and put it on a chassis dyno. Say it measures 450whp. Put back in 15% drivetrain loss and you are at 530bhp. Now you're saying the actuall drivetrain loss is 80hp. Nothing has changed, but now your drivetrain is taking nearly double the hp to turn.....I don't think it works that way unless someone has re-written the laws of physics.

This is why a baseline dyno is such a useful thing to have. I am of the opinion that saying the stock drivetrain eats up anywhere from 20-40 hp is a better way to estimate power at the crank. When you start talking about parasitic loss of superchargers or thermal efficiency of turbos, it gets a little more complicated, but it still doesn't change what your drivetrain takes to turn. I could be wrong, but until someone wants to take the time and spend the coin to do both chassis and engine dyno testing, the baseline dyno I ran tells me that the drivetrain on my car takes ~30hp to turn regardless of what kind of power I'm making at the crank.

Formula

I made 232 whp stock on a mustang dyno, now I have around 350 whp

DLZ314

Formula, even with my assumption that your s197 is an auto, that whp figure seems extremely low. How conservative is your tune?

Formula

Its a manual. It was tested on a mustang Dyno SAE corrected for weather - and not all the way up to redline (let off around 5500 rpm).

Its the standard v3 brenspeed kit and tune that makes around 400whp on a dynojet.

808muscle

Yeah dude, dont worry about dyno numbers...............they dont put a huge smile on your face. Get yourself a good tune from a reputable tuner (brenspeed, bama, tillman etc...), a cai and your car will feel like a entire new vehicle.

patrick

DLZ314

No ****, huh?
I keep threatening to look more deeply into their V3 kit, but if I go that route I'd want a few more hp to hit the tarmac. Did you install it yourself?

DLZ314

Sorry to wander off topic in my last post kids.
To the OP, Patrick is right. That $600 spent on a Tuner/CAI combo is WELL worth it.