Having a debate with someone in my office.

Figure a 1993 Z28 with decent compression.

Mac 1 5/8" shorties.
1.6 rockers.
LT4 valve springs.
Callaway Honker CAI.
Cat replaced with straight pipe.
2.5" cutout on stock intermediate pipe right before the axle.
Fastchip stage II chip to maximize above mods.

What would you ballpark the horsepower to be at with the above mods? At the motor not RWHP.

 

My guess would be 315hp at the flywheel. What's your guess, your no rookie?

 

315 flywheel sounds about right

 

Ditto on 315.

 

I'd expect that setup to put down around 290-295 rwhp, so I'd say the flywheel HP would be closer to 335.

 

I had said between 320-330 hp. The 93s also respond better to those mods.

I remember when I had those exact mods I was running 13.3s at the track. Can't remember the mph. 106?

My coworker was WAY off. He figured 350 hp.

 

335---could be. One can only take a WAG. Stock, the RWHP would probably be around 335-340, thereabouts if everything is working well. Then one would need to consider the contributions of the mods ----and whether the A/F numbers were maximized, etc. And...you really can't take each mod separately, but consider the combination and how each mod effects the other. E.g., the headers are 1 5/8, whereas with a 350 CID, 1 3/4 might work out better. Also, Dyno numbers can vary from machine to machine and one pull to another.

And...backing into the crank numbers from RWHP is also subject to WAGs.

It's pretty much a mystery.

 

My buddy's car with nearly that exact setup (minus a chip - he had the stock tune) put down 297 rwhp through a 6 speed, which is probably closer to 340 HP at the crank.

But yeah, this is all bench racing as there are too many variables involved. 315 to 345 is probably a good range.

 

I would guess it to be around 330-340ish as well.

 

290-295 at the wheels.

 

330 at the most