My Gtech quarter mile numbers

[Sandman33]

I went out a few nights ago and with me, my friend, and two sets of golf clubs in my car we got ONE decent run in at 14.2 @98mph no powershifting. I wasnt happy at ALL.

So he let me borrow it and I removed all my clubs and went out tonight...

My first run started out GREAT with a perfect launch and a powershift into second...my foot never left the gas. Right in the middle of 3rd gear I saw headlights coming the other way and hit the brakes because it might be a cop.......14.1 @ 85mph! BWAHAHAHAHAAA! Thats fking HILARIOUS. I laughed my ass off when I read that mph at 14.1. That means I was probably headed for a mid to low 13.

So I got one more run in before calling it a night. No powershifting, medocre launch, it hit these numbers:

13.82 @ 102.7mph
2.1 60 ft.

It said 327 hp but I don't think it's calibrated correctly since my friend had it set at a higher weight before and it read 308 hp.

With speed/powershifting Im sure I could knock off a few more tenths at a solid mid 13. It really does make a big difference because speedshifing keeps your RPMS much higher....they don't get a chance to fall so far down and it keeps you right on top of the powerband.

WIth a set of simple drag radials and a 1.8 60 ft I'd bet it would hit low 13 second numbers on the track.

And it's pretty much stock. Just flowmasters and a K&N filter in the factory airbox.

 

[walter]

I often wondered how accurate those accelerometer based devices are really.

In theory a car with a stock suspension should register faster numbers for the simple fact that the weight transfers happen more quickly (albeit sloppily because they are up and down) then a car with a suspension which feels more flat and has less pitch and dive.

 

[COBESGT]

Hi my name is COBESGT and I'm a GTECHaholic!

I also use a GTECH but haven't used it on the Mustang yet. I can tell you that my 1991 Taurus SHO will consistantly run 14.6 - 15.0 secs @ 98 - 99 mph. Damn that old POS is pretty fast! From past experience, the times/speed from a GTECH are a little better compared to the track (like 1 - 2 mph higher & .2 - .3 secs faster). I'll try to explain this.

The GTECH starts your time as soon as you launch. At the track, the time is based off of the lights and your reaction to the lights.

Once started the GTECH starts making it's calculations based off of the accelerometer, while making it's calculations it determining time/distance and then stops reading when it reaches the calculated distance (1/4 mile) and gives you your time/speed. OK, so how is this different than the track?

At the track there are two points at the finish line, one at the finish and one a little ways back towards the start line. The two points read your speed then avg the speed to give you a final trap speed.

The best thing about a GTECH is you can enter your weight and as items are added to your car, you can check several things to see how these mods affected the car. Oh yeah, plus they are a ton of fun!

 

[Steel Horse]

How much do these run? I have been looking for gift ideas for my brother. This could be a good option.

 

[blbrchnk]

How much do these run? I have been looking for gift ideas for my brother. This could be a good option.

gtech

 

[rugedraw]

I also use a GTECH but haven't used it on the Mustang yet. I can tell you that my 1991 Taurus SHO will consistantly run 14.6 - 15.0 secs @ 98 - 99 mph. Damn that old POS is pretty fast! From past experience, the times/speed from a GTECH are a little better compared to the track (like 1 - 2 mph higher & .2 - .3 secs faster). I'll try to explain this.

The GTECH starts your time as soon as you launch. At the track, the time is based off of the lights and your reaction to the lights.

Once started the GTECH starts making it's calculations based off of the accelerometer, while making it's calculations it determining time/distance and then stops reading when it reaches the calculated distance (1/4 mile) and gives you your time/speed. OK, so how is this different than the track?

At the track there are two points at the finish line, one at the finish and one a little ways back towards the start line. The two points read your speed then avg the speed to give you a final trap speed.


The best thing about a GTECH is you can enter your weight and as items are added to your car, you can check several things to see how these mods affected the car. Oh yeah, plus they are a ton of fun!

+1; exactly.

The accelerometers have no way of calculating the time it takes your car to leave the staging area. Most newer accelerometers, if you read the manual, it tells you this and tells you to add .35-.5 seconds (depending on how fast/slow your car is) to the time it reads and you get more accurate numbers.

 

[bradleyem]

What did you have entered for the weight of your car? How did you determine the weight?

The key to the accuracy of accelerometer type devices is having the weight accurate. I have a SCT Livewire that also has a G-Tech type feature. The GVW on my door sticker is 4550Lbs. I took it to a truck scale and it weighd in at 3500Lbs, which is a huge difference. I don't know if I trust that weigh in, so I'm going to take it to a different scale to check.

G-Tech type devices are still fun, and a good way to guage changes from mods, and to dial in you're driving.

 

[COBESGT]

The GVW sticker on the door is NOT the correct weight of the car. The GVW is the maximum allowable total weight of the car. These Mustangs weigh around 3500 lbs. Then you have to take into consideration the weight of the driver and then the add the weight of the fuel (Unleaded gasoline weighs approx 6 lbs/gallon). So for my Mustang, with me driving and with a half tank of gas, the total weight would be:

3500 + 250 + 42 = 3792 lbs