Note: Its a large file and takes 30 seconds to load if ya have cable connection might take a few minutes if your dial up. If ya want a larger view double click on the graph when it comes up and pick a larger size this might take 30 seconds or so. Also the red line run actaully looks more light gray. (I highly suggest to double click the image and go two sizes bigger to get all the details)

Ok everyone I did a few runs with My Gtech. I have the 4.77 ring and pinion (bought from Rick's and installed by Ganley Honda). Around me there is only one safe place that I know to do these runs. Problem is it is short and I have to brake hard before the 1/8 mile mark. The first run (black line) was done with my hardtop on and with my blizzack ws-50's on. I had crazy wheel spin on the take off and still managed a 5.4 to 60mph. I had to brake before the 1/8 mile mark but as you can see I was at 81mph before the 1/8 mile mark. The second run was done a few days ago. I had my top down and my S02's back on. I also had alot of wheel spin on the launch as you can see by the crappy 0 to 60 feet number but my 0 to 60 mph was 5.2. You can clearly see where I had to shift. At about 36mph, 56 mph and then at 76mph. I think these numbers are pretty good. Reaching over 80 before the 1/8 is not bad. My 1/8 mile times are with me braking before hitting the 1/8 mile point. Hence the the high time and low mph for the 1/8 mile times.

Hope this is able to be read I'm not sure how my scan will come out.

To let ya know I have an AEM cia, Invidia exhaust, straight pipe , vfac with vtec cross over set at 5000 rpm, ricks 4.77 ring and pinion. No Nitrous was used and I have the Horsepower charts for these runs to prove it. I did launch and had way to much wheel spin. altitude is about 700 ft. Temp was in the 20's on the black run and in the low 40's for the red run.

Hope the chart is readable.

 

The faint line after the 9 second mark (there is actually two lines just hard to see) is where I crossed the 1/8 mile mark as you can see I was braking at the time.

 

Nice

 

IB, can you give us a re-cap of your earlier findings with the 4.44's and stock gearing for comparison. I know they are posted in another thread, so perhaps even a link would be nice - just to have it all in one place.
Even better is if you could give us a "number crunch" comparison of how your times have changed going from stock to 4.44 to 4.77.

 

I 2nd that, but even as is, thanks for the work and sharing - it takes time to put all that together, and even though i am not currently a gear candidate, I appreciate your effort.

 

I can do even better. I have alot of my runs saved on my work computer. I can make graphs just like this one comparing all three gears. 4.10/4.44/4.77. I will start to make the graphs tomorrow. Hopefully I will have a graph up by this time tomorrow.

But just to give you a recap. The average of my 4.10 gears to 60 was around 5.7 to 5.8
the average of my 4.44 was around 5.4. I've only done a few 4.77 runs about four. I still have not mastered the launch with the 4.77 they are harder to feel out and launch then the 4.44. The black line run in the graph above was my worst run with the 4.77 but I was able to get a longer run in which I wanted to show espescially shifting into 4Th. I believe that the average for the 4.77 will be around 5.2 unless I can master the launch. If i can zone in on a 2.3 0to60 feet a 5.0
average is doable with the 4.77. These are averages but my best 4.10 was worst than my best 4.44 which was worst than my best 4.77. Hands down the 4.77 has enough goose to beat my
best 4.44 even with the extra shift. These charts are pretty accurate the shift points are right on the mark exactly on the correct mph.

I think you will all like the comparision charts. GOOD STUFF!

I will also look for my old write -up

 

Thanks for all of the good info....it's greatly appriciated.

 

It's important to note atmospheric conditions when using the GTech. I've been
using them since 1999 and probably have more than 400 logged runs (only a few
on my S2000 as I now use a Tazzo). You should always do your runs in both directions
for at least five runs (time permitting). Throw out the worst and best while averaging
the rest. This will give you a truer indication of how you are doing. The temp difference between the runs (20 degrees) in addition to any significant changes in the barometric pressure will also affect your accuracy. The unit works best when test
conditions are as parallel as possible but I'm sure you already know this.

On another note, may I suggest a Tazzo? Tons better than GTech. You can
measure time and speed in between RPM points which takes away all the
variances created by wheelspin.

tazzo.com

 

Russ. Thanks for chiming in. I always do 4 to 5 runs in opposite directions. My averages for the 4.10 and the 4.44 gears are with over a dozen runs eachs. The tazzo looks neat might have to buy one of those.
With the second generation software downloaded into the gtech I can replicate runs within hundreths of a second for example one run 5.46 next run 5.42

Just so everyone knows I am using the second generation gtech comp pro came out in late 2002 it is a million times better than the original gtech which came out late 90's which I had.

Yup gtech has it pitfalls for sure. But if you do enough runs and take averages it can give you a good indication of where you are at.

My basic problem is I don't want a six point roll cage and harness. The tracks around me require this if you run under 14 second quarters in a convertable. So Its gtech test and tune for me now. Maybe in a few months when I finish my current project thats in the works it will be Tazzo test in tune.

anyone have any thoughts on the other measure devices....I think escort makes one and apexi?

P.s. Russ ya ever figure out the coe of drag for the s2000. So I can convert my Horse power gtech numbers to be compatable with say a dynojet number.

 

just a question, but how does temperature and pressure affect the readings for GTECH....doesn't it just use an accelerometer?