I just got my Gtech pro performance meter about a week ago and have only had the chance to make a few late night runs with it. So far I have put down a 15.4 at 94 mph and a 0-60 time of 6.96. I dont doubt these times for accuracy although the trap speed for the 1/4 mile time seems a bit high, I believe with some work on launching w/o spinning or bogging too much should result in high 14s in the 1/4 and maby low 6s 0-60. I do have a quaetion concerning the HP function of the machine. I tryed this twice and input the weight of the car approx 3700 lbs plus the driver me at a lithe 240 and the tools and car seat est at 50 lbs also the rims are slightly heavier so figure about another 15 lbs for a grnad total of about 4005 lbs running, however with all this inputted it is showing approximately 175 hp at the wheels which seems EXTREMELY low due to the fact that my car shoul be putting out more than that stock, anyone else have this problem with HP accuracy on there Gtechs and if so is there anything I can do to cure it?

I appreciate your help

I dont have the Gtech but find your experience to be the same as others who have used it.
I think your weight estimate is a bit high, should be more like 3700lbs. Which would bring your horse power closer to 240 at the wheels for 15.4 quarter.
Your trap speed to be accurate you would measure over 300hp.

I think the Gtech is good when based against itself and is of use when tunning and modding your car. It shows if improvement is being made but cannot substitute actual track data.

My experiences with the Gtech Pro are varying. I've seen as high as 244 hp at the wheels. No way in hell. Remember that you're losing 25% through the drivetrain, so if you measured 200 at the wheels, it would be roughly 250 crank.

I was just out running mine again, and I'm determined now to calibrate the thing correctly after the transmission is fixed. Think of the Gtech as a rough estimate. In all seriousness, I think a stopwatch in a passenger'* hands on a paced-off 1/4 stretch of road is about as accurate.

What is everyone using for their weight???? I estimated 3750 lbs... However, I'm Going to get mine weighed thiis week...

Old Man Salmanman