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You can play with these suspension settings and try to detect the effect =
of the changes, assuming you have some way of obtaining an infinite =
amount of track time or a skid pad (limited but useful) to do the =
testing, or you could get a simulation program to play with. That=E2=80=99=
s how I initially dialed in Peyote and the results were good. These are =
dynamic systems with a lot of variables that interact. It=E2=80=99s not =
easy to optimize, but a good suspension simulation program can model =
everything that=E2=80=99s going on. The biggest problem then becomes =
modeling our ancient cars with their odd suspension components that no =
modern engineer would ever dream of using in a modern car. It can be =
done by approximation=E2=80=94even a TR3/4=E2=80=99s bonkers trunnion =
system can be approximated, it takes some work and will never be =
completely accurate=E2=80=94but it=E2=80=99s a lot closer than cut and =
try will get you.=20
Bill Babcock
Beach Bum
bill@ponostyle.com
https://www.Ponostyle.com
> On Jul 12, 2021, at 4:40 AM, Scott Janzen via Fot <fot@autox.team.net> =
wrote:
>=20
> I can tell you what my GT6 has. What you run I=E2=80=99m sure depends =
to some extent on tires.
> I run Toyo R888Rs - radials. They like negative camber. =20
>=20
> Fronts - 2.6 degrees negative camber, 1/16=E2=80=9D toe in, castor 6 =
degrees. Stock is 4, +/- 1. I have to admit I have never tried to =
adjust this up or down. With more castor, I think the camber gets a =
little more negative with turn-in, which is probably good as it counters =
body roll on the outside wheel. However, now you=E2=80=99ve got me =
thinking, and I may dial it back to stock to see if I notice the =
difference.
>=20
> Rears - 2.5 degrees negative camber, slight toe in to counter =
suspension flex.
>=20
> Hoosier bias plies (like the TD, which comes in 13=E2=80=9D sizes) =
don=E2=80=99t like negative camber, so they are not interchangeable with =
these camber settings.
>=20
> You can also adjust the castor by playing with the amount of shims =
front and rear on the lower a-arm, which will move the trunnion end of =
the A-arm front and rear. Of course, that effects the camber, iterative =
process. =20
>=20
> I inherited my car with work done to reduce bump steer - mainly by =
bending the steering links down. Very little bump steer within the =
normal operating range.
>=20
> Be curious to hear what settings you end up with, or others use.
>=20
> Scott Janzen,
> =E2=80=9968 GT6, but with inner and outer u-joints at the rear and =
spicer sliding halfshafts.
>=20
> On Jul 2, 2021, at 5:32 AM, Enquiries Road & Track via Fot =
>=20
> could anyone racing a GT6 (or even a Spitfire) please offer some =
comment on front alignment "settings". In particular, have you made =
engineering changes to increase the static caster?=20
>=20
> The most obvious option is to change to the trunnionless vertical =
links used on various clubman type race cars ., eg Caterham or Birkin. I =
have a set of Birkin alloy uprights , but i'll have to make suitable =
wishbones .=20
>=20
> I'm trying to recommission our Mk2 GT6 racer which we have not used =
for many years, and my memory was the "stock" front end was not good =
with "modern" slicks and particularly mid-corner indecision.=20
>=20
> Any comments gladly accepted
>=20
> thanks
>=20
> Terry=20
> Australia
> _______________________________________________
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive =
http://www.team.net/pipermail/fot
> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/sjanzen@me.com
>=20
>=20
>=20
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive =
http://www.team.net/pipermail/fot
> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/bill@ponostyle.com
>=20
>=20
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Content-Transfer-Encoding: quoted-printable
charset=utf-8
<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">You =
can play with these suspension settings and try to detect the effect of =
the changes, assuming you have some way of obtaining an infinite amount =
of track time or a skid pad (limited but useful) to do the testing, or =
you could get a simulation program to play with. That=E2=80=99s how I =
initially dialed in Peyote and the results were good. These are dynamic =
systems with a lot of variables that interact. It=E2=80=99s not easy to =
optimize, but a good suspension simulation program can model everything =
that=E2=80=99s going on. The biggest problem then becomes modeling our =
ancient cars with their odd suspension components that no modern =
engineer would ever dream of using in a modern car. It can be done by =
approximation=E2=80=94even a TR3/4=E2=80=99s bonkers trunnion system can =
be approximated, it takes some work and will never be completely =
accurate=E2=80=94but it=E2=80=99s a lot closer than cut and try will get =
you. <div class=3D""><br class=3D""><div class=3D"">
<div><b class=3D"">Bill Babcock</b><br class=3D""><i class=3D"">Beach =
Bum</i><br class=3D""><a href=3D"mailto:bill@ponostyle.com"; =
class=3D"">bill@ponostyle.com</a><br =
class=3D"">https://www.Ponostyle.com<br class=3D""></div>
</div>
<div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jul 12, 2021, at 4:40 AM, Scott Janzen via Fot <<a =
href=3D"mailto:fot@autox.team.net"; class=3D"">fot@autox.team.net</a>> =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; line-break: after-white-space;" class=3D""><div dir=3D"auto" =
style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break: =
after-white-space;" class=3D"">I can tell you what my GT6 has. =
What you run I=E2=80=99m sure depends to some extent on tires.<div =
class=3D"">I run Toyo R888Rs - radials. They like negative =
camber. </div><div class=3D""><br class=3D""></div><div =
class=3D"">Fronts - 2.6 degrees negative camber, 1/16=E2=80=9D toe in, =
castor 6 degrees. Stock is 4, +/- 1. I have to admit I have =
never tried to adjust this up or down. With more castor, I think =
the camber gets a little more negative with turn-in, which is probably =
good as it counters body roll on the outside wheel. However, now =
you=E2=80=99ve got me thinking, and I may dial it back to stock to see =
if I notice the difference.</div><div class=3D""><br class=3D""></div><div=
class=3D"">Rears - 2.5 degrees negative camber, slight toe in to =
counter suspension flex.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Hoosier bias plies (like the TD, which comes in 13=E2=80=9D =
sizes) don=E2=80=99t like negative camber, so they are not =
interchangeable with these camber settings.</div><div class=3D""><br =
class=3D""></div><div class=3D"">You can also adjust the castor by =
playing with the amount of shims front and rear on the lower a-arm, =
which will move the trunnion end of the A-arm front and rear. Of =
course, that effects the camber, iterative process. </div><div =
class=3D""><br class=3D""></div><div class=3D"">I inherited my car with =
work done to reduce bump steer - mainly by bending the steering links =
down. Very little bump steer within the normal operating =
range.</div><div class=3D""><br class=3D""></div><div class=3D"">Be =
curious to hear what settings you end up with, or others use.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Scott Janzen,</div><div =
class=3D"">=E2=80=9968 GT6, but with inner and outer u-joints at the =
rear and spicer sliding halfshafts.<br class=3D""><div class=3D""><br =
class=3D""><div class=3D"">On Jul 2, 2021, at 5:32 AM, Enquiries Road =
& Track via Fot <<a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D"">could anyone racing a GT6 (or even a Spitfire) please offer =
some comment on front alignment "settings". In particular, have you made =
engineering changes to increase the static caster? <div =
class=3D""><br class=3D""></div><div class=3D"">The most obvious option =
is to change to the trunnionless vertical links used on various clubman =
type race cars ., eg Caterham or Birkin. I have a set of Birkin alloy =
uprights , but i'll have to make suitable wishbones . <div =
class=3D""><br class=3D""></div><div class=3D"">I'm trying to =
recommission our Mk2 GT6 racer which we have not used for many years, =
and my memory was the "stock" front end was not good with "modern" =
slicks and particularly mid-corner indecision. </div><div =
class=3D""><br class=3D""></div><div class=3D"">Any comments gladly =
accepted</div><div class=3D""><br class=3D""></div><div =
class=3D"">thanks</div><div class=3D""><br class=3D""></div><div =
class=3D"">Terry </div><div class=3D"">Australia</div></div></div>
_______________________________________________<br class=3D""><a =
href=3D"mailto:fot@autox.team.net"; class=3D"">fot@autox.team.net</a><br =
class=3D""><br class=3D""><a href=3D"http://www.fot-racing.com"; =
class=3D"">http://www.fot-racing.com</a><br class=3D""><br =
class=3D"">Donate: http://www.team.net/donate.html<br class=3D"">Archive: =
http://autox.team.net/archive http://www.team.net/pipermail/fot<br =
class=3D"">Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/sjanzen@me.com<br class=3D""><br=
class=3D""><br class=3D""></div></div><br =
class=3D""></div></div></div>_____________________________________________=
__<br class=3D""><a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a><br class=3D""><br =
class=3D"">http://www.fot-racing.com<br class=3D""><br class=3D"">Donate: =
http://autox.team.net/archive http://www.team.net/pipermail/fot<br =
class=3D"">Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/bill@ponostyle.com<br =
class=3D""><br class=3D""><br class=3D""></div></blockquote></div><br =
class=3D""></div></body></html>=
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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