greg schroeder

I don't know what to tell you. I also have the old Gtech meter and see similar numbers out of that unit, though my 0-60 mph times are more often lower in the 4.2 to 4.5 second range instead of the 5 seconds as shown in the above displayed Gtech Pro run. The displayed run was for illustration as it was my first try running a quarter mile with the new unit.

The G-tech pro requires two procedures of calibration at different temperatures before using. This is done so the unit has the ability to calculate for temperature compensation of the accelerometers. The larger the temperature split between calibrations the better. The unit is self leveling unlike the old G-tech meter. For my first higher temperature calibration I left the unit on the seat of my vehicle in the sun. For my second calibration I put the G-tech Pro meter in my refrigerator. I used a Raytech temperature gun on the surface of the unit to be certain a suitable temperature split was achieved from one calibration to the next.

Testing for both the Porsche and Mazda were performed in the same location on a level road perpendicular to two major road ways of the same elevation. I don't believe the same G-tech pro meter would work with less accuracy from one vehicle to another given the same conditions.

We are experiencing cooler weather here in Arizona this time of year. This will enhance performance. In addition, previous to both the Mazda and Porsche runs we were certain to keep the vehicles out of boost while driving at freeway speeds for several minutes. Neither of the cars were heat soaked, lending most appreciable conditions for testing.

biiig-hp

I don't have a problem with the time on the X50, just the mph. I never saw above 117 mph on my G-tech on my GT-2.I may have got a week one but it had no problems walking on X-50's up here. I do live at 3400 ft and the corrected air is usually between 4000-5500 ft, but I don't think it is enough to justify 8 mph difference from one gtech to another. Again I'm not doubting the numbers your seeing, just trying to figure out how your getting them.

Indykid

I thought greg's speed looked a little high considering the srt viper on my g-tech chart trap speed is 122mph which is right on target with everything that I have seen. I agree that both cars would need alot more hp to acheive those speeds.

greg schroeder

I could appreciate skepticism had I of done a sloppy job testing or not offered detail in my actions, but I've done everything by the book and the numbers I offer are factual.

Yes, my car accelerates faster in many speed ranges than the Viper SRT as well. I've confirmed this not only with the Gtech Pro competition meter, but as well with a rolling punch side by side with a car of the type. I don't know why it would be so hard to believe that my 1/4 mile speed is higher than the Viper SRT.

As for the 996tt X50 trap speed why would that be hard to believe? It's nearly identical to the 996tt non-X50 stage 1 posted by MBailey. The 117 mph number that that Biiig-hp offers for his car is at 3400 ft above sea level with correction of even more. That's a huge disadvantage to the 1250 feet elevation on a cool day were we tested. Road and Track gets 1/4 mile mph similar as Biiig-hp's out of a base 996 tts with just 330 wheel HP.(that's about what the base 996tt puts to the ground).

In my opinion there should be a bit more credibility in a properly calibrated G-tech Pro Competition meter used on a level surface, over that of random thoughts based on hearsay.

MBailey

Along the lines of the altitude discussion, my testing was done at sealevel.

Indykid if its not too much trouble post your G-tech chart. Id like to see how a viper srt did in 0-60, 0-100, ect..

Indykid

I thought that you had the x-50 g-teched at 11.8 at 124mph? Am I wrong here?

Indykid

Sure here it is.

greg schroeder

Yes. That was the time.

We tested the X-50 after cruising on the freeway without boost on a notably cool day. Having cool intake temperatures will result in better times and mph? Likewise we could have driven the car hard for several minutes, then turned it off to heat soak for a bit, then done the run to achieve lesser numbers. Cool temps good numbers, hot temps worse numbers.

Here's an example. I did my earlier displayed Rx-7 G-tech pro run with intake temps in the 20C range. The numbers were good. Today however I drove around and did some city driving with plenty of motionless activity as well as shutting the car off once for a couple minutes. With my tiny stock intercooler my intake temperatures actaully got up to 74C. Ouch! I have no doubt if a G-tech run would have been performed under such conditions we would see easily an extra .75 seconds added to the 1/4 mile and a reduction of speed of -15 mph or more. It's all relative.

It's not very complicated. Our goal is to achieve the best results possible, so we run the cars warmed up, but with as cool of intake temperatures as possible.

greg schroeder

edit

RSRRacer

Here are initial runs in my TT with my new Gtech. I lifted before the 1/4 mile mark or I would have been about a 11.7 @ 123 or 124.

I cant figure out how to launch it, either it bogs down or wheel hops.

Indykid

I can hit 60 ft times of 1.6 to 1.7 and 0-60 times of 4.2 with a launch of 4500 rmp.s if that helps

Indykid

I doubt that you would have trapped 123mph, I think that 116 to 118 is more probable.

RSRRacer

Indykid:

Look at the black baseline run - I hit 118 at about 11.1 seconds and actually let off the accel for the last 3/4 of a second. The run in red (though shorter) was a better launch. Based upon this run I should be able to get 11.6-11.7 and 123 or so.. We will see....

Thanks

MBailey

RSR,
Those dont look like stock numbers unless your car is an x50, GT-2, or modded. Tell us what your secret is.

Indykid

Well, I don't know what to say, I've seen some people get the g-teched 1/4 mile to be very accurate however the speed is inaccuate. I'm not saying its not possible with a stock 996tt to hit 123 trap speed its just that you would be the only person in history to do it. NO OFFENSE INTENDED.