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That must mean your mom was white, too, right?

What changes to a percentage? The fuel gauge?

Anybody know what kind of tires those are?

Oh, I was very confused . . . 😆

You can clearly see on the graph the horsepower is still climbing sharply and has a ways to go.

WHY?

A pair? There are two in the center?

So the Whipple tune cut it off at that rpm?

Wow!

You are just sayin' . . . but why?

Track package and Gurney Flaps Installed . . . have you tracked it yet?

No stock Dark Horse is hitting the speed limiter in a standing mile.

That was just the tune. The other parts were in the baseline number. So custom tuning increased horsepower by 4%, or, stated another way, adding the aftermarket parts (headers, ported intake, etc.) added horsepower, but left 4% on the table using the stock Ford tune. It's kind of a lot when...

There is a lot more to tuning than timing, especially on this engine. spark timing - and there is more to it than simply adding timing, in fact, retarding timing at the top end of the quarter mile is used by professional and serious amateur drag racing teams Example...

In an older thread @Q6543 says is is advisable to swap belts when going fro 3.5 to 3.75 K060815 is for the smaller pulley. Still, this is monster power. I wish he had shown the SAE number instead of just STD, but it is what it is (marketing).

ARGH I just noticed the "STD" in the upper right hand corner.

827 rwhp 659 rwtq No Tuning (standard Whipple tune) He does say the car has long tube headers. This was run on E30, basically adding some E85 to your tank. The kit comes with a 3.75 pulley for when you want to run 91-93. So E30 definitely helps in some situations. I wonder what tuning...

Well, at least now I know this much, the Dark Horse is not limited to 155.

LOL, I did not mean to start a fight. I just assumed the concrete would have more traction, and as a plus it was arrow straight and flat and empty, but, yeah, I was skidding around like I was on ice. Maybe I'll try it again on asphalt and report back.

Very useful information with actual experience. Thanks. This is helpful to several here, I am sure.