I got G-tech result of 230hp and 204torque for 10psi run.
Engine related mods: K&N intake, y-pipe, Greddy SMIC, downpipe, hf cat, N1-Dual, flywheel.

 

sounds like you might have input the weight on the higher than what it really is. Was the road straight and flat and did you do a run back the other way and average them?

I weighed my car at the track and feel I was within 10 to 15 lbs of that weight when I did my g-tech runs (how full the tank was). Mine was within 6 rwhp and when I went to the dyno a couple of days later.

Tim

 

The opposite run gave me 180hp.
I ran 3/4 tank, and I am 155#. I put in 2950 for weight.
The car is base FD with no spare tire.

 

well I'd throw both values out if there is that much variance between the 2 runs on the same road, same day. was it windy?

Tim

 

not windy....I do suspect the tires slip...when it goes into secondary turbo.
I am still new to G-tech.
But maybe you can help. I have been doing this in second gear. How to do it in third gear. Because the Gtech starts as soon as I pull up in first gear.

 

is it the new model or the old model (black with red numbers)? I used the older version when I made the 289. Luckily I had a street/road that was about a 3/8 of a mile long. I'd zero it out on the hp setting, then when it's flashing go, get on it a bit in first and second, then take 3rd and 4th to redline. After I slowed down it would display the estimated rwhp.

Tim

 

this is the new pro comp ones. with nice display...
start to feel like kids meal toys...

 

I have that one now for the hell of it...not sure why I got it since I haven't used the damn thing or the software that comes with it. Have you yet?

Tim

 

I went to real dyno today.
My car gets 278.xxhp and 244.xx ft/lbs
An hour later, I G-tech it at 245.1 and 221.1 ft/lbs.

So there are about 33hp difference, which is close to 15% difference between the G-tech and the dynojet.

The PASS software that comes with it is a piece of crap.
Just use it to download, and export into CSV. Then do your graph with Excel...

I can't wait for the 4.0 firmware which can take lateral G measurements as well.

 

Actually - its the other way around. If you put in too LOW of a weight, you get lower HP reading. It makes sense - no ?

What GTech measures is acceleration.
And lower weight vehicle SHOULD accelerate faster given the same horsepower, right ?
So given the same acceleration, if you increase the weight, also the measured horsepower increases (it must increase to hold the same acceleration).

 

Do you have the .gtp files to share? Much can be determined by reviewing the Gs page.

 

NVM...engine blew up a week later after dyno at autocross.

 

No wonder with those mods on stock ECU.

 

reza... I know that name from somewhere... wasn't he a racer in cannonball run?