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Old 03-22-2005, 05:38 PM   #1
 
Join Date: Dec 2004
Posts: 1,497
Q: Regarding use of a G Tech

Well, I just bought a G Tech
SS on Ebay the other day and
have a question about it's use.
Does it calculate 1/4 mile time
and MPH based on what it comes up
with for a 0-60mph time or do you
drive a full 1/4 mile? I took my
truck to the local building materials
yard and they weighed it today.
With me not in it and just under 5/8ths
of a tank of fuel it weighs 4880lbs. A
lot more than I thought it would. My
Ca. vehicle registration shows a unlaiden
weight of 4440lbs. They probably are not
factoring in the Hemi engine, 20" wheels,
tow package and my SnugLid SL which weighs
125lbs.

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Old 03-23-2005, 09:52 AM   #2
 
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Q: Regarding use of a G Tech

I got mine on saturday and reading the instructions I think it stated that for the 0-60 times to make sure you slow down to under 35 or come to a complete stop befor going 1/4 mile - I will recheck later this afternoon and comferm. - have not been able to use yet but looking forward to it - had a question about the weight also but am going to have to hit a scale house my self
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Old 03-23-2005, 12:04 PM   #3
 
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Q: Regarding use of a G Tech

So if your going to calculate a 1/4
mile time/speed you have to drive
the full 1320 ft? I guess the weight
of your truck only needs to be known
for HP and TRQ figures. Seems to me
that all the calculations that involve
elapsed times do not require vehicle
weight.
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Old 03-23-2005, 10:41 PM   #4
 
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Q: Regarding use of a G Tech

OK here we go - I have the Gtech Pro - I played with it for a couple of 0-60 runs and came in at 8.0 and 7.8 - I also did a HP run and got a 242hp - this is at 39deg today - have not reset the #23 in a while so will try it again - also want to put the stock filter back on and then work my way thru my CAI system - going to try the single CAI - stage 1 and then the stage 3 and then my own system with the duel stock system then the tubes running down both sides - will put up a post as I get them done. This is what the manual states.

Weight is displayed on plate in door - it includes full passenger capacity - subtract 180 for each missing person - I am to assume that would be 5 on capacity - my thought is to subtract the 900 lbs and add driver weight.

I show 6650 gross wght so I put in 6025 lbs for my runs above. Just a side note - I also noticed that my door plate showes 17" rims but I have 20's could this be messing up the computer ? - I bought the truck with the 20's on the window sticker.

It also states - most tracks average your speed at the last 60 feet of the 1/4 mile run while your G-Tech measures your speed at the exact 1/4 mile post so some discrepancy is to be expected.

ACCURACY - the manual says
0-60 mph 1/100 sec
60-0 breaking 1 foot
1/4 mile E.T. 1/100 sec
1/4 mile speed .1 mph
horsepower 1 hp - this is of cource rearwheel which says is a 10 - 15 % loss through drive train

as far as measuring maximum H.P. it states that it will be delivered in the lower gears at close to red line so make sure to get up there in RPMS - to end measurement it says to go above 120 or slow down below 30 mph - it dose state it will be a few percent lower than on a dyno due to drag

as for the 0-60 and breaking - it says it has an intelligent feature of auto determining if you are going fo a 0-60 or a 1/4 mile - after going over 60 you can keep accelerating to the 1/4 mile or slow down the G-Tech will are trying to do - if you stay on it it will do the 1/4 mile time - if you start to slow down it will do the 0-60 measurement - also if you dont know the exact 1/4 mile mark - the G-Tech does the measuring for you ( what a nice little toy HUH ) it desplays the elapsed time and the mph at the 1/4 mile

It also does the instantaneous and continuous G's - the instantaneous G's will be cool to see off the line and stoping but I think if I try the Continuous G's I will be typing about how my truck is on its side and I have to get me a new one.

Any way - sorry for the long *** post but just trying to get some info out there and also get some back from you guys - thanks for reading and of course for all your thoughts and sugestions.
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Old 03-24-2005, 01:46 AM   #5
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Q: Regarding use of a G Tech

6025 is a good STARTING point. add 50 for bedliner, 50 for tonno, 80 for nerfs, 50 for the 20" over the 17" Got power seats? add 55 for those. Anything listed on the option side of the sticker. Limited slip? 3lb. Trailer tow hitch? 25.
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Old 03-24-2005, 01:48 AM   #6
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Q: Regarding use of a G Tech

I'll bet it says more than 242 now. A better HP figure you can prolly get here, once you do a few 1/4 runs.
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Old 03-24-2005, 01:52 AM   #7
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Q: Regarding use of a G Tech

In my 4x2 without NO2, I run 7.1, 7.2 0-60 times. And 15.6 @ 87 1/4 mile. I took the trap and a weight of 5600 with me, tonno, bedmat, nerfs, amps and woofers, and got 290rwhp, with afe CAI and catback. Also I am at sealevel.
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Old 03-24-2005, 08:55 AM   #8
 
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Q: Regarding use of a G Tech

thanks TR1 - I will have to er do my weight - Might have to go hit a truck scale around here to get the true weight - I know I will have to run a few more times to get something better - also I did have at least 3/4 tank full so I know I am not doing ANYTHING right - but it was my first couple attempts - will post new results as I go. Thanks again
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Old 03-24-2005, 03:55 PM   #9
 
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Q: Regarding use of a G Tech

Well, as a side note my truck
0-60mph stop watch times have
seem to improve since I did
the fuse #23 PCM reset. My
times jumped to 7.45 after
reset. That was 317 miles after
doing the reset. I am now about
750 miles since reset and I did
a 7.25 this morning. I won't be
doing the fuse pull anymore as it
does hurt performance for awhile.
I am scheduled to get my G Tech
on the 29th. Can't wait to try it.
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Old 03-24-2005, 07:19 PM   #10
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Q: Regarding use of a G Tech

FRH: My 4x4 QC SB weighed in at 5760 lbs. with me (175), my son (25), 23+ gal. of gas (185 lbs), spray-in bedliner (10 lbs), and about 15-20 lbs. of random crap inside the truck. 6000+ lbs. is a little much when the curb weight is around 5200 lbs. GVWR isn't a good benchmark. My times were (@30-35 deg F):
6.68 sec 0-60
15.18 sec @ 91 mph for 1/4 mile
HP: 294

The stats have dropped a little as the weather has warmed up, but Superchips has compensated some, so my recent 1/4 mile times are almost the same but the power has dropped to 269 hp, though).
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