Given how much you don't know about the number they gave you, I would not be concerned/upset/worried/fretting about it. Put her on a dyno to maximize power and get a real number (with some variance of its own)

However, 500 was not ever going to happen, I'm sorry to break your heart

 

I agree probably be around 415 to 420ish in a manual f-body, 440ish with a free flowing exhaust system.

 

Get rid of the shorty headers and add LTs. You'll pick up 20-25HP, easy. Two things that restrict these builds; air in and air out. The TBSS intake is plenty for your build but, those shorty headers are just the same as stockers...get rid of them.

 

those numbers seem decent to me given the combo. The only calculators you should trust are Dynos (somewhat) and Drag times. What did you do with those square port heads? You can throw them into my trash can

 

The app is just uses a GPS signal. It's just like a Dragy with out the box. You just use your phone. I heard it can be paired with a GPS device through your phone to make it more accurate.

 

If it doesnt know the weight, how is calculating the hp? If the entered weight isnt accurate, how does it know?

HP is unit of work. The math needs to know how much work (weight moved) is being done in a certain amount of time (rpms climbing/mph increasing)

 

Maybe he's talking about the calculated engine horsepower in the scanner. You can log that on just about any vehicle.

I use that channel all the time on the DI engines. I need the peak engine horsepower/torque very similar to predicted and calculated engine torque/horsepower.

 

so its based on engine size and fuel load?

Sorry for the redundant questions, I am not a tuner/ user of HPT, just trying to understand whats happening here

 

Yes the number cam from the scanner. Is it remotely accurate?

Tim

 

When I was a youngster, we weighed our cars at the track and then made three or four passes before making any more changes. After those runs we could mathematically calculate how many horsepower we were putting down to the rear wheels through the traps. Small, high stall converters certainly felt better off the line but nearly always resulted in lower elapsed times and a loss in horsepower through the traps.

Curb Weight*((MPH*0.00426)^3)