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

 

You're probably heavier than you think. You should be on level ground and have the Gtech level too and in the middle. Gtech is also going to account for rolling resistance and air drag. It's only an accelerometer. It calculates hp based on an accurate weight and accurate acceleration readings.

 

My 86 LG4 car weighs in at 3520 with me in it and a 1/4 tank of gas and full intererior a 25lb speaker and box and 2 amps and an amp rack. I weigh 135lbs.
I got a GTech reading of 199rwhp with my 305 LG4 motor with my Edelbrock Carb and Intake installed. I run 14.9 @ 91.67mph in the 1/4.


High Speed Run: 157mph
Best 1/4 mile run: 14.94@91.67mph
WS6 Trans Am.

View My Ride @ thirdgen.org

 

I've used my G-tech on several cars and the results seem to coordinate very well with factory ratings. My friend's '96 Camaro V6 had a 172hp on the G-tech. Remember that these are rear-wheel horsepower numbers. With a 15-20% driveline loss, that equates to around 200 flywheel hp. My friend's '89 5.0 had around 210 hp and it runs 14 flats. My car with a stock intake had 300 hp, which equates to 345 flywheel horsepower. Make sure you weigh the car and run on level ground. Try to use first and second gear, that way air resistance does not slow you down.

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1992 Camaro Z28; Engine:383 w/Ported Edelbrock RPM heads. Lunati Solid Roller Cam 224/232 .502/.502, Fluidampr, Comp Cams 1.5 Roller rockers and lifters, Comp Cams Triple Valvesprings, SVO 30 lb injectors. Holley/Walbro 255 lph in-tank pump, Haltech E6GM DFI, SLP 1 3/4" headers, 4" Mufflex, T56, SLP Clutch, Pro-5.0 Shifter, 4.10 Gear, Auburn Offroad Pro Posi. Super Ram. 17" X 9.5" Ronal FireHawk Rims w/ 275 40ZR17 Bridgestone RE 730's up front and Nitto Drag NT 555R's out back.

Double-Pump This! EFI Rules!