Skid pad is sustained Gs, not instantaneous peak. Usually measured on a 300'
diameter curve. I read a study somewhere that measured Kumhos, R1s and
Hoosiers with various sports cars and the highest sustained G they measured
was around 1.25. This would lead me to suspect that Borden's 1.47 is
probably a peak value -- however if it's sustained then I want a ride!
Also remember that since the G-Whiz is a two-axis accelerometer it cannot
compensate for elevation changes. So if you measure Gs while going up an
incline you will get higher readings. Based on experience with my own G-Tech
pro I can tell you that these things are HIGHLY affected by even slight
elevation changes (and bumps!).
> -----Original Message-----
> From: owner-ba-autox@autox.team.net
> [mailto:owner-ba-autox@autox.team.net]On Behalf Of james creasy
> Sent: Thursday, March 07, 2002 11:25 AM
> To: Darren Madams
> Cc: J C; ba-autox@autox.team.net
> Subject: Re: Geez! (was: Going Downhill)
>
>
> i think it also shows the max peak and sustained lateral, accel
> and braking
> G's. kinda cool as borden registered 1.47 lateral Gs (and 1 G braking and
> acceleration), and i think vic said he was getting 1.4 lateral on
> kumhos. i
> wonder how it compares to a skid pad G test.
>
> -james c
>
>
> ----- Original Message -----
> From: "Darren Madams" <darren@madams.com>
> Cc: "J C" <veloimpreza@yahoo.com>; <ba-autox@autox.team.net>
> Sent: Thursday, March 07, 2002 2:13 PM
> Subject: Re: Geez! (was: Going Downhill)
>
>
> > I have one of the early serial number cubes back when it was a "Box" and
> > way before it was "Extreme". I've found it pretty useful, but it's best
> > use is comparing to other drivers in the same car.
> >
> > It does map the general shape of the course, but it can't be
> used to tell
> > how far off the apex you were. It does have numerous guages that show
> > calculated speed in MPH which can be used to see when you were above or
> > below other runs... or how fast you were when you broke. It takes some
> > time to do the analysis the day after, but combined with the knowledge
> > that Byron has collected over the years (which he's willing to share in
> > person and in NAP), and the data I've collected, I feel like I better
> > understand where REAL time is gained and lost. Of course, I still have
> > problems executing that plan, but at least I know where I'm losing a
> > chunk of time (high speed sweepers).
> >
> > Theoretically it can be used to judge performance improvements
> of various
> > car modifications as it tracks peak and sustained lateral g's as well as
> > a calculated horsepower guage. If you have access to a 100ft skidpad it
> > would definitely be good for alignment and tire testing, but all the
> > variables on your typical autocross run generally prevent that (unless
> > the change is major between runs of course).
> >
> > As Josh said, http://www.extremegeez.com/ and Byron Short is always
> > willing to answer questions when he's not out on the road working or
> > giving seminars.
> >
> > --Darren
> >
> > You wrote:
> > > It's a device and software to help you analyze your performance during
> > > performance driving. It has micro accelerometers such that
> it can track
> the
> > > cars every motion during your run, and you can compare two
> runs with it
> (was
> > > my co-driver faster in that corner? Why? Oh, I see, he broke earlier
> than
> > > I did and got on the gas sooner coming out).
> > >
> > > Developed and sold by longtime autocrosser Byron Short.
> > >
> > > http://www.extremegeez.com/
> > >
> > >
> > > ----- Original Message -----
> > > From: "J C" <veloimpreza@yahoo.com>
> > > To: <ba-autox@autox.team.net>
> > > Sent: Thursday, March 07, 2002 10:07 AM
> > > Subject: Re: Going Downhill
> > >
> > >
> > > > --- Darren Madams <darren@madams.com> wrote:
> > > > > More importanly, it's hiding in every braking zone
> > > > > and every straight
> > > > > too... Jesus is a pretty good guy to listen to!!!!!!
> > > >
> > > > > Oh, and get a Geez cube and a codriver. :)
> > > >
> > > > Why do I get the feeling like I'm opening up a can of
> > > > worms here by asking... "What is a Geez Cube"? Are you
> > > > talking about someone aged 30 or over ;-)? <hehe>
> > > >
> > > > > The biggest place to gain and lose time is the
> > > > > slowest corner before the longest straight. At the
> > > > > Atwater kart track that fact is painfully obvious
> > > > > (and a delight for those of us that understand that
> > > > > secret).
> > > > >
> > > > > Best book about this stuff is "Speed Secrets" by
> > > > > Ross Bentley (it was recommended to me by Ben
> > > > > Martinez who is quick enough already)
> > > >
> > > > Thanks, I'll check it out. I already have Henry Watts'
> > > > "Secrets of Solo Racing" which has been quite helpful.
> > > >
> > > > Joe
> > > > Try FREE Yahoo! Mail - the world's greatest free email!
|