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Old 04-02-2003, 09:31 PM   #1
dookiebob
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Default G-Tech Competition Pro performance meter

I just got a G-Tech Competition Pro performance meter from www.subarustore.com (Titan Motorsports). They had the best price I could find on the web ($225 + shipping).

Anyway, to the review: I've only played with this thing for less than 1 hour, but I am already REALLY impressed. The unit is able to measure 1/8 mile (speed and time), 1/4 mile (speed and time), 0-60, 0-100 (or 0-whatever you set), and 330ft. And that's just for drag racing! There's also HP, Torque, RPM, fully functional shift light, lateral G sensor with warning light, and more that I haven't figured out yet.

Anyway, I took it out for a little spin...

It's amazing how difficult it is to find a level road with minimal traffic without potholes (in Philly). I was able to find a relatively short stretch around where I live and I got some baseline 0-60 times.

With an EXTREMELY conservative launch, I was able to record 5.7 0-60 (VF34 Ecutek tuned stage 4+). I thought that it was very accurate, as I know I could easily eat a second or more with a clutch-slippin', tire-squealin', tranny-breakin' launch. I wasn't ready to do a competition ready 0-60 because there were way too many distractions outside. We'll see how I do on Roosevelt Expressway at 6am tomorrow, when nobody is out on the road.

The HP monitor is accurate when you do a 2nd or 3rd gear pull. I have a feeling that 3rd gear will give slightly lower numbers, as the increase in aerodynamic drag at 90ish mph causes a decrease in observed HP. Also, I don't really have an accurate weight of my car with me in it, but I guesstimated about 3450, as my car has a bunch of weight added to it (Dynamat, leather seats, crap in trunk). We'll see what my car really weighs when I put it on a truck scale. I wasn't able to get a good HP measurement, as I was aiming for 0-60, but the HP I saw was about 235, which is not too shabby. I think this number will be slightly higher with a true 2nd gear dyno pull

The PC software is not out yet, but it will include real-time HP charting, course plotting with lateral G's (essential for auto-X), ability to save and compare runs, and much more I'm sure. Can't wait to see it...

So, in summary, I am VERY happy with the purchase. It does SO MUCH for so little cash. I will be sure to post updates after I tinker with it some more.

-Bob
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Old 04-03-2003, 02:48 AM   #2
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Hey, Bob
Could you measure my rex's 0-60 time and HP, too? I'm still living at same apartment which is close to your area.

Choi.
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Old 04-03-2003, 06:02 AM   #3
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Quote:
Originally posted by wrx2
Hey, Bob
Could you measure my rex's 0-60 time and HP, too? I'm still living at same apartment which is close to your area.

Choi.
No problem man... PM me and we can set up a time

-Bob
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Old 04-03-2003, 11:44 PM   #4
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Bob

Did you ever us the original G-Tech Pro? That is what I have, and thought I like it I think the Comp would be a nice upgrade. My biggest gripe with mine is having to monkey with it to get it level. I wondering if you had used the old one if you thought that this was a worth while upgrade.
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Old 04-04-2003, 12:05 AM   #5
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Quote:
Originally posted by roybfr
Bob

Did you ever us the original G-Tech Pro? That is what I have, and thought I like it I think the Comp would be a nice upgrade. My biggest gripe with mine is having to monkey with it to get it level. I wondering if you had used the old one if you thought that this was a worth while upgrade.
I've never used the old one, but from what I hear, this unit is LIGHT YEARS ahead of the old unit.

I'm having a blast with mine... 235 awhp and 227 TQ is what I got tonight. I figure that it would probably push a little more on the dyno, but for right now it's a great estimate. I'm gonna run it on WRXURV8 and wrx2's cars this weekend (hopefully) to get a baseline of how much my car is making. WRXURV8 has a cat back Borla and wrx2 has a TXS stage 2 without engine management I believe.

I can't wait for the software package to come out. Supposedly, it is right around the corner

-Bob
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Old 04-04-2003, 05:42 AM   #6
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Bob,
Just let you know that I'm running Vishnu stage1 with catless/samco hose mapped unichip with EMI adapter.
I can run my car on Sunday after evening time. I will call you anyway.
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Old 04-04-2003, 11:58 AM   #7
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G-Tech gives you better time/higher HP than you would measure at the track or on a dyno. When I had Probe GT I ran 15.3s a 1/4 mi at te track consistently. That was w/o subwoofer and amplifier (~100lb), tire and jack (~30 lb) and with me in the car by myself. One fella had a G-Tech, so we mounted it in my car with spare, jack, subwoofer, and this fella in the passenger seat. That was roughly 300lb extra. I did two runs and got 15.2 with G-Tech...
This fella friend of mine with G-Tech had it in his 220 hp maxima and was claiming low 14's all the time. I find that hard to believe.
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Old 04-04-2003, 01:23 PM   #8
kenchan
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yeh, but the g-tech is probably a useful tool to measure
before and after doing a mod.

not sure about you netting less than before though.
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Old 04-04-2003, 01:59 PM   #9
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Quote:
Originally posted by il96
G-Tech gives you better time/higher HP than you would measure at the track or on a dyno. When I had Probe GT I ran 15.3s a 1/4 mi at te track consistently. That was w/o subwoofer and amplifier (~100lb), tire and jack (~30 lb) and with me in the car by myself. One fella had a G-Tech, so we mounted it in my car with spare, jack, subwoofer, and this fella in the passenger seat. That was roughly 300lb extra. I did two runs and got 15.2 with G-Tech...
This fella friend of mine with G-Tech had it in his 220 hp maxima and was claiming low 14's all the time. I find that hard to believe.
Actually, it gives you lower HP than you would measure on the dyno. The losses incurred to drag and rolling resistance are significant, and lead to a HP loss. The only way a G-Tech would over-estimate HP is if you did your runs on a decline (cheating) or if you grossly overestimate the weight of your car (also cheating). My runs are on a FLAT road (next to a water reservoir) and I estimated about 3450 lbs for my car and me. If you've seen my car, you know that I have a bunch of extra weight in it. Plus, I weigh about 180 (about 200 with clothes, shoes, books), so that has to be added in.

Your anecdote about the differences in measured 1/4 mile times has far too many variables to have any credence. You need to measure the difference on the same time, same track, same day, and same run. Those persons who set up the G-tech properly usually see a difference of +/- 0.1 seconds vs. track times.

Also, remember that I have the G-Tech Competition Pro model:


and not the old G-Tech:


The old unit has only 1 accelerometer, and it is not temperature calibrated. This unit has 3 temperature compensated accelerometers, and is much more accurate than the first. It also looks cooler and has more features...

It really is a great buy

-Bob
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Old 04-04-2003, 07:09 PM   #10
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Bob

To use all the features of the Comp do you need to tap any of the ECU wires.

Troy
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Old 04-04-2003, 07:13 PM   #11
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Quote:
Originally posted by roybfr
Bob

To use all the features of the Comp do you need to tap any of the ECU wires.

Troy
This is the best part! You don't have to cut ANY wires whatsoever Believe it or not, it just hooks right into your cigarette lighter.

The only "problem" I have found is that for my RPM to track correctly, I have to turn on my headlights. No biggie

-Bob
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Old 04-05-2003, 12:02 PM   #12
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Your HP does not drop with air resistance. Your speed does. Eventually at top speed ALL the power of your engine is going to be equal to the force of friction in the drivetrain + force of air resitance. That's when you stop accelerating.

I don't know how good your new G-Tech is, but you're right, we were using the older model.
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Old 04-05-2003, 12:46 PM   #13
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Quote:
Originally posted by il96
Your HP does not drop with air resistance. Your speed does. Eventually at top speed ALL the power of your engine is going to be equal to the force of friction in the drivetrain + force of air resitance. That's when you stop accelerating.

I don't know how good your new G-Tech is, but you're right, we were using the older model.
Horsepower is calculated by this unit as a function of force times distance.

HP = F x d

The force of air resistance contributes a significant amount of loss to observed HP. The rolling resistance also contributes a loss to observed HP. Thus we have:

HP (obs) = {F(engine) - [F(air resistance) + F (rolling resistance)]} x d

This unit measures acceleration, and thus by putting in an accurate mass, it calculates observed force.

F(obs) = m(user input) x a(measured variable)


You could do a similar equation by calculating torque, but I'm not doing the math The equation for calculating HP from torque is as follows:

HP = TQ x RPM / 5252

The force variable is incorporated into torque in this method of solving for HP.


Thus, observed HP will be lower with the G-Tech competition pro than a dyno due to the force of air resistance and the force of rolling resistance. It even makes that caveat in the user's manual.

Sorry to get all technical... The unit is really a lot of fun. I'm gonna see how good I can make my 0-60 times now

-Bob

Last edited by dookiebob; 04-05-2003 at 12:56 PM.
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Old 06-18-2003, 05:43 PM   #14
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Firmware version 3.0 and PC software version 1.0 just released -> http://autos.groups.yahoo.com/group/gtechpro/

Chieh
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Old 06-26-2003, 08:33 PM   #15
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G-Tech PASS 1.1 just released.

Chieh
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