I ran my car a bunch of times the other night with my Gtech. I was getting consistent 13.7 @ 107 which seems close, but for horsepower numbers it was showing 289. Doesnt that sound a little high considering my mods (in my sig)?

 

Assuming you were on a truely level road, and installed the g-Tech accurately on all 3 axes, it will routinely turn out decent ET results that are +/-2/10ths from what you would see at the track, and typically gives you an over-stated MPH number that is 4 to 8 MPH higher than what you would see at the track - and this MPH difference is not a result of "average speed over the last 60-ft" vs. "true speed at 1,320-ft". That difference is less than 1 MPH. I don't think the HP numbers are valid in any way.

You can cancel out the "level road" issue to some extent by running the car in both directions and averaging the results, but there is little you can do to correct the over-stated MPH results.

No substitute for taking it to the track.