Well I finally got to use a G-tech Pro to get some idea of what my ride will do in the 1/4 mile. My friend rode with me cause I didn't know how to work it. He told me after my runs that all my runs would have been slightly better if I were by myself. I logged the weight of the veh with driver at 3279 lbs (did not incl my friend @ 210lbs) and shift point was 8500 rpm. I launched between 5000 - 6000 rpms each time with the dsc off. I ran a consistant mid to high 14 with an avg speed between 90 -93 mph in the 1/4. My slowest time was a 14.8. I am only running a Greddy SP2 exhaust and a custom CAI I made several months ago. Overall I was pretty happy especially since I was carrying an extra person that weighs more than I do. I cant wait to add more mods and do a couple runs by myself.

Best times:

60ft - 2.25
1/8 - 9.33 @ 77 mph
1/4 - 14.5 @ 93.6 mph
0-60 was 5.88 sec
AVG WHP was 175.6


60ft - 2.5
1/8 - 9.6 @ 74mph
1/4 - 14.6 @ 92.3 mph
0-60 was in the low 6's

Like I stated above my friend thinks my true numbers will be around 14.3 to 14.4 in the 1/4 @ 93 - 96 mph. He also feels I may have around 180 -185whp.

 

I need to figure out how to get mine working properly. I put in 3300 lbs for car weight, a "2" for tilt, but the rpm reading was sketchy at idle... It was telling me I made about 140 hp. On the real dyno on friday I had about 255 before it was tuned up a bit to 270. So the numbers are a bit different.

I did a decent 1st gear launch, no dropping the clutch, rpms started at 900, and floored it once I was about 3k rpm in 3rd gear.

using the pro SS model.

 

I had "1" for tilt and my rpms were dead on the entire time. Initially mine said 154 hp. My friend told me to drive it like I stole it and my hp registered at 175 on average. My best time when I launched around 5000 rpms.

I take it you have a turbo.........270 hp.

 

yeah, I wonder if I decrease the car's weight till I get consistent results (always launching from 3k rpm in 3rd gear) that match up with the current dyno, if that would be a good way to proceed (as a baseline) and be able to test mods.

Otherwise, if what you're saying is true, it's really not graphing my car's power, it's graphing how well I launch it :P

 

That's what it seemed to be doing to me. When I first launched I did so around 3000 rpms and it said 154 hp an 15.8 in the qtr mile. When I dumped the clutch I got 175 hp and ran a 14.5 qtr mile.

 

quarter mile and 0-60 times are different in that you need to actually go 0 to 60, and you have to travel 1/4th of a mile to get the times. The HP and torque readings should not care if you're dropping the throttle from 3,000 rpm or 5,000 rpm. In fact, you'll want to start the throttle from a low rpm range so that you can see the entire power curve.

 

G-Tech blows. Get it dynoed and take it to the drag strip.

 

good idea, maybe I should go visit a dyno! *rolls eyes*

 

I'm very aware of all that you mentioned. I was just saying when I tached my car up and dropped the clutch the G-tech gave a higher hp reading than it did when I eased of the line before getting down on it. I thought it was strange the way it worked.

 

nice numbers

 

I have a 10 second car, a G-tech told me so!

 

i'm sure u know this, but wanted to add the info anyway.

g-tech has to be mounted perfectly perpendicular to the ground & the road ahead.

 

It was.....attached it to the windshield with the suction cup mount.

 

Not true. That's why it calibrates itself. Its fairly simple math - the accelerometers register change in acceleration in a direction. This is how velocity and distance are derived. It doesn't give two ***** about where it begins, especially with those that have a 3-axis sensor, like the Gtech Pro. Now, if you don't have a flat road, then you're going fawk up it all up because it has no way to distinguish acceleration from simple changes in pitch caused by an undulating road.

Does it replace a dragstrip or dyno? No (not yet), but it's an interesting and pretty damn accurate tool for measuring acceleration. The horsepower part its calculations are affected greatly by the parameters you input into the device - better for measuring a delta in hp (before and after mods, for example)

 

LOL yah, I have a 10 second run too... i can show you the readout on the GTech!!!
All I had to do is hold the gtech in my hand, hit the start button, and tilt it about 45 degrees for 10 seconds. I think I was going about 145 mph too.

 

To the OP thanks for sharing the G-tech data. I have had a G-tech thats been used on many cars and trucks for many years and although I know its not dead accurate, it is pretty consistent for baselining. It also really helps you realize how easy it is to botch a launch or a shift, or understand the differences of launching with esp or dsc on or off. Its a great tool for working on technique if you have a nice flat straight river-bottom highway available for testing. FWD cars are a real test to hook especially when they are running higher boost, and without the G-tech it would have been harder to recognize the best methods to use .

JR