G-Tech Results

[BSoldie]

I finally conceded and spent the $130 for a G-Tech. I have to say, it has proven to be a hot topic of conversation to all of those with whom I've spoken to about it. My truck has the following mods: #5 plate, gov. springs adjusted, BHAF, gauges. The trans is a stock auto, gears are 3. 54 and the truck is a regular cab 2500. Here are the G-Tech results:



0-60: 9. 85 sec.



1/4 Mile: 17. 25 @ 82. 7 mph



HP: 286



This was on fairly level ground, with minimal wind. The best times were achieved without brake torquing, when I brake stood it, the times were much worse due to excessive wheelspin. Also, for the HP reading, I entered in 7,000 lbs. The truck weighed 6,500 empty when I put it on a scale, but with full fuel plus me I felt 7,000 to be in the ball park. Clearly the stock trans proved to be a big handicap as I thought it would.



Overall, the 0-60 was quicker than I thought it would be. The 1/4 mile was about as I expected, and the horsepower was a little higher than I thought it would have registered. Has anyone else ever tried one of these G-Tech's?

 

[RottnDogue]

Brian are you going to the Dyno in May? I would be curious to see how it compares to the #'s you have... .



Darren

 

[BSoldie]

Darren,



Yes, I will be at Dyno day. According to the G-Tech instructions, the calculation for horsepower is done through a complex mathematical formula that figures in the vehicle weight versus the rate acceleration obtained through the accelerometer within the G-Tech. Therefore, the actual results obtained on a dyno are usually up to 3% higher than those of the G-Tech due to variations in headwind, road grade, etc.

 

[RottnDogue]

Higher than 286 would be sweet... . What is a Number 5 plate rated at?

 

[BSoldie]

From my understanding, the #5 plate is the 270/675 plate. Of course, the plate HP levels and plate numbers are dependent on the configuration of your truck. For example, #11 plate in an auto equipped truck will have a different power level than one in a manual truck. The year of the truck can also determine the power level of the plate whereas a 160 hp pump will differ from a plate installed in a 180 hp truck, I think.

 

[HoleshotHolset]

Having NO plate will yield different results as well.....



Matt

 

[RottnDogue]

OK Matt you showing anything besides the New Bumpah's off at the next dyno?

 

[HoleshotHolset]

24-valve intercooler, my well rounded belly, my #_ plate, new transmission lines..... um... . that's about it... other than the bumpers.

The GF will NOT be there... so I can't show her off... .

 

[RottnDogue]

****The GF will NOT be there... so I can't show her off... . ****



Damn I think me constantly Picking on her, wore her down in the end. .

 

[HoleshotHolset]

She just couldn't stand 15 hours of pure Cummins diesel bliss..... she may never understand my obsessions. Then again, I hate literature... . and she's getting her MA in it... . so it all works out in the end.

 

[RottnDogue]

Originally posted by HoleshotHolset

She just couldn't stand 15 hours of pure Cummins diesel bliss..... she may never understand my obsessions. Then again, I hate literature... . and she's getting her MA in it... . so it all works out in the end.

I hear ya. . if I ever brought the Wife we would be :-{} before Lunch..... She has her things, that she tells me about and I try to look interested, and she does the same for my things...

 

[HoleshotHolset]

I hear ya... .

I'm surprised my GF lasted that long... .

Oh well, we live and learn.



Matt

 

[Diver-Dave]

I used the G-Tech as well and got some very strange results. I must say that with the mods I've made I expected much greater HP readings.

My g-tech times/figures were:



0-60 6. 55 seconds

1/4 mile 15. 5 seconds at 95 mph

305 HP for a 0-60 run



I've got a '97 3500 that I estimated my fully loaded weight at 7300#. I also have a Warn brush guard with a 9500 winch.



Using trap speed calculators, I should be putting out over 400HP!



'97 Driftwood 3500, 370 injectors, JRE TC, transgo shift kit, TST AFC Spring Kit, TST #5, Piers 3000 RPM GSK, 191 Delivery Valves, Timing @ 15. 5, Banks Turbo, Non-California intake. KDP stopped with CPFF jig!

 

[RottnDogue]

Yeah Dave 305 seems low, with your mods, and based on what others have gotten you should be in or at least very very close to the 400 club.

 

[Diver-Dave]

Funny thing though, if I make a run up past say 65mph and then floor it, the readings shoot way up past 400Hp. One time I got a reading of 500hp+ when going up hill. I must be doing something wrong. I think maybe the G-Tech should only be used on level ground.

 

[Mark_Kendrick]

I have one too. Level ground is a must. Wind is a Huge factor and accurate weight is imperative. The only time I have ever gotten believable HP numbers was after weighing on a scale.





I have not gotten ETs that I believe yet. . I guessI'm in denial

 

[BSoldie]

You guys are right about the level ground assessment. When I tested out the G-Tech yesterday morning, I only had time to perform three acceleration runs and only one HP run. Today I decided to see if the HP would read higher if I tested it on a slight decline. I set the G-Tech for HP, waited for the "GO" light, and nailed it. I didn't do anything different from the run in which I obtained the 286 HP reading. Interestingly enough, I only got a 198 HP reading. I attributed this to the decline ( somewhat steep) and after reading that you got a much higher reading while performing this test while going uphill, I presume that my results are consistent with the assumption that LEVEL ground is a must for accuracy ( or as accurate this device can be). I didn't have time to do acceleration tests with a downhill grade, although I suspect there wouldn't be the same type of inconsistency as there was in regards to the HP readings. The manual does emphasize that level ground must be sought out prior to conducting any performance measurement with the G-Tech. Makes sense to me.

 

[Mark_Kendrick]

If I had the energy I could explain about the acceleration due to gravity and how on a incline this affects the reading of the gtech due to a vector created by gravity and the accelleration of the vehicle but suffice it to say. . the assumptions that make the G-Tech work are hosed if you're on an incline. Oo. Oo.

 

[PZicha]

Diver-Dave I will almost bet your weight is more than 7300# , my truck weighs in at 8000# plus ( 96... 3500 )

 

[HoleshotHolset]

I have a G-tech... . it has about 1/2" of dust on it too.

Best way(s) to figure out HP..... drag strip and of course the highly controversial chassis dyno... .



The G-tech is too inconsistant, and if you get a ton of weight transfer when your truck squats under acceleration... . it is no longer parallel to the ground and perpendicular to the force of gravity... which it has to be to get exact readings.



It is a cool little device, though..... good for bragging rights... hehe



Matt