I'm just curious how this thing works and how accurate it is. I run the below car 1/4 in the mid 13's and usually at 105+, do 0-60 in 5.5 or less and I just did a horsepower reading with the GTECH for the first time. I input my weight at about 3450 with me in it and it said 203 hp. How can a car running those times only be putting 203hp. If I am correct I am supposed to hit it through a couple of gears up to redline and be accelerating hard. Is this right or am I doing something wrong. I just don't see how a car with that little power can run those times, thanks.

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87 GTA 350 L98
K&N filter, beefed up TH-700r4, Accel Manifold, Superram, Fuel Press. Regulator 49.5psi, air foil, modified MAF, SLP cold air box, Accel 24lb Injectors, Hypertech Thermomaster chip w/160 thermostat, MSD 6AL and Blaster 3, B&M shift kit & megashifter, Moser Ford 9in Rear with Richmond 3.50 and locker, Edlebrock TES headers and Cat Back,Gutted cat, removed emissions, Hotchkis setup in rear, Poly suspension and Koni in the front, relocated MAT, bypassed TB coolant, 300 lbs lighter

 

A 3450 pound car running 105 MPH should be putting out about 312HP.

Your car with you in it would need to be less than 2500 pounds to run 105 MPH and only 203 HP.

ET is only a result in traction. MPH is what determines how much HP you have. You can spin off the line, getting a poor ET but the MPH will stay the same.

I'm guessing you don't have the proper variables inputted into the gtech, gears etc or your getting your results wrong by not doing the procedure properly.

HP is how quickly work can be done. A typical car going down the highway only needs about 50 HP (VW bugs can cruise at highway speeds with less. It took them a long time to get going that fast but they can do it). HP can be seen when you try to pass someone on the highway. More HP and you can shoot right by them especially without dropping down a gear.

Chances are you did something wrong in getting the readings.


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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.69
Best MPH on a time slip: 121.52 altitude corrected to 127.76
Altitude corrected rear wheel HP based on power to weight ratio: 504.5
Best 60 foot: 1.546

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

[This message has been edited by Stephen 87 IROC (edited May 27, 2001).]

 

Weight needs to be accurate and keep in mind that a G-tech can only give you rear wheel horspower, but it is based solely on weight so if that is inaccurate the end result will also be.

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Iroc Z28 with several mods for domination of autocross courses. BFG T/A R1s for the courses and Yokahama AVS Intermediates for the street.