I rescently purchased the gtech-pro competition, upgraded the firmware, and did a small test run on a local "drag strip"

Here's the results... know that I have a bad secondary turbine shaft with a streetport, and a bunch of other goodies... that's not the point... this unit is very cool, and allows you to measure all kinds of forces.... even side to side, I hope they add a skidpad mode soon

Here's a screenshot of the software and one of my runs...

 

so did the gtech 1/4mile time match up with ur actual 1/4mile time at the track or was it off by a little and by how much?

 

Haven't taken this car to the track due to bad turbo, concidered it a waste of time...
Plus I entered 2700 lbs as weight, and I would Imagine if I get the ctual weight it would be closer... the idea for me is to be able to see if I made or lost HP, with mods I do... that way the whole discussion on well does it enhance performance can be settled...

-DC

 

I know for a fact that an upgraded software is in development for GTech Competition which will be able to provide data similar to Geez!

 

I'm using Geez! which uses sensors that are essentially the same as the G-Tech but has much more powerful software.

Info here: https://www.rx7club.com/race-car-tech-103/geez-chassis-plots-events-season-275348/

 

Nice !!

Does it create the map based on forces or do you have to provide a "Track" to the software !?

 

Geez creates the track map itself along with measuring all the accel/cornering forces along the plot.

 

Wow Damon, very cool. That seems like a dream come true for an avid auto-x'er like yourself.

DCrosby, how much was the upgraded firmware? I have been looking at the G Timer, but this may sway me towards the GTech Pro.....

 

That's the best part, Free Firmware upgrades

Can it figure out when you've come back to the same point and do lap times ?? That would keep me from getting one of those timing devices

 

Yes, but it's not perfect. A timer with an external beacon would be much more accurate.

The purpose of Geez isn't to record laptimes, horsepower, 0-60 or 1/4 mile times (though it can and is at least as accurate as any G-Tech) but to educate the driver on where he is under driving the car and giving up time he shouldn't. The track mapping is recorded in real time and then afterwards dozens and dozens of parameters can be compared and checked. I use it to try different approaches to the same section of track and then I can see what the tradeoffs or advantages were for each one.

 

Geez looks pretty slick.

I had a GTechPro once, and found it to be at the most marginally accurate. The internal horsepower calcuation was consistently inconsistent (pun), but I found that the accelerometer graph by itself was fairly decent. In order to get consistent peak HP numbers, I took the average linear acceleration over a few hundred RPM's range in the top of 2nd gear on a _smooth_ pull, and calculated back from the wheel diameter including the reductions of the gearbox to arrive at instantaneous torque at that point, and calculated horsepower. I got a a consistent 298-ish whp, which was pretty spiffy for my turbo'd 1.8L 4-banger at the time

 

I know, I know
I wanted Geez! also, but I find it a bit pricey. GTech would be more accessible

 

I use my gtech all the time, and i love it. I find that it is very accurate and consistant.
adam

 

How do you know it's accurate?

 

Consistent, probably. Accurate? In the absolute loosest definition of the word, marginally.

 

Here we go again.. . "My Laser calculated, atomic clock timing device is much better @ $5,000.00 than your $50.00 POS....

Accuracy? Well it's cheaper than going to the dyno, everytime you change something, and I lost count as to the posts on inaccuracies of a dyno when the barometric pressure changes, or heat soak.... Mustang / vs / Dynopack do I need to go on... ???

Fact is HP varies with some Cow Farting upwind from you on the road and the added methane burns in the combustion chamber....

The software Damon is speaking of does look nice, but since it is software I'm hopefull that someone will either write similar software or Gtech will finally release theirs....

 

Heh, yeah, definitely, here we go again. "My little wonder gadget that I have no idea how it works is so great..." Hey, no need to get all defensive. Sure, the GTech can be consistent, meaning it can tell you whether a change you made gained some power or acceleration, provided that the test conditions are consistent, just like any other true test.

When I mentioned accuracy, I'm referring to the "Gee, lookee here how much horsepower I'm making, who needs a dyno?" or "Wow, lookee at the 0-60mph or quarter-mile time my car did, who needs a dragstrip?" that the more gullible purchasers of this product sing about.

 

Perhaps this is the wrong place to ask this, but I'll go ahead anyway...

Does the Geez have 3 axis accelerometers? With the new software for the GTechPro (And the new RR) it can calculate/adjust for corners that are off camber etc. I'm just wondering if the Geez software can do the same. The only shortcoming I now see is the pretty map, however the new software does allow you to compare lap to lap. Hopefully I'll be able to test this all out next week and report what i find if people are interested.

 

I weighed my modified base FD recently at one of the certified truck scales for $9. It was 2980 lbs with a full tank of gas and me inside. So that is what weight I use for my power meter - which by the way is pretty much useless for power calculation (though the boost vs speed rocks!).

I didnt remove anything so I figure remove stereo amps/subs and spare tire and loose 100 lbs. Then put the roll bar in and get right back up to 2980 - oh well good thing I have 350 rwhp and dont really worry about weight too much .

Look for one of the yellow CAT scale signs - only takes about 5 min an dcosts less than $10 to know what it weighs exactly.

 

No. As you said this only effects the map and there are easy adjustments in hte Geez software that can be made to display the map up properly. The recorded data is still valid, it's just that the display of the map can be impaired when the surface is not flat. I spend no more than a couple minutes adjusting maps now since I know what to look for.

Think of G-Tech as a car performance tool and Geez as a driver performance tool.

 

As promised here's a comparison from over the weekend between my (not quite operating properly) FD and a 'stock' (as in - not really stock) Z06 driven by a good driver with much more experience than myself. As you can see I was about 10 seconds slower than him. Ignore the RPM graph on the Z06 as it wasn't calibrated properly.

This was my first event in any car on a 'real racetrack' at speed. The track was Mid American Motorplex, which is right near Omaha Nebraska.



Here's the full size screenshot

On a few of the turns I was a little slow getting on the gas coming out (2 and 14 - partially due to above engine problems) and in the straight I let off early also due to the engine issues. A few spots I also hit the brakes a little too much probably due to bad line (entry to turn 5 and turn 7).

You can see in the friction circle I'm getting 1.08 G's of cornering force. I'm also maxing out the turning+brake/accel at about 1.2-1.25 G's which is pretty good.

My current setup:
Yok ES100's - 245/45/16 on stock wheels.
Tein Flex Coilovers on setting 10 from full hard in the front and 12 from full hard in back, 25" ride height
-1.65 camber front, -1.1 camber back
No toe front, 1/20th" in the back
New pillow bearings/Toe Links/Trailing Arms in back
Stock Twins with 11-12 lbs max boost, with pettit intake, dp, mp, cb and ecu
Fluidyne Rad, Evans coolant
Stock brakes, EBC Green pads
3000 lbs total weight
Miscellaneous other stuff.

His setup:
Really wide R compound Hoosiers
Fast 'stock' Z06 (I think he said 380 to the wheels)
About 3300-3400 lbs total weight

My fuel pump is on its way out and my turbos are not great. Also I have a turbo control issue that causes no primary boost when the car is hot.

Anyone have any comments/suggestions?