From what I understand regarding these devices is that they are very accurate for calculating net HP. They use a mathematical calculation for HP that consider the weight of the vehicle and the passengers. If you know the weight of a vehicle and the time it takes a vehicle to change speed over time, you have all you need to calculate HP.
These devices "absorb" the effects of road surfaces and wind resistance. Dynos do not. So, if you get say 250 hp on a dyno, the reading will be less when using a computer because wind resistance will impart force to try to slow the car down. So what you see displayed on the unit is really "net HP".
Definitions:
1. Max HP - HP at the Fly Wheel
2. RWHP - HP from the Fly Wheel minus transmission losses (this is what you get from a dyno).
3. Net HP - RWHP minus wind resistance and road resistance loss
One advantage of a G-Tech Pro device (or similar) is that if you make changes to improve the aerodynamics of the car (or make it worse), you will see it show up as an increase in HP or Net HP with no impact, of course, on RWHP. Kind of neat if you think about it.
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My Stang:
2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)
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