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I also just monitor tire temp across the tread and wear patterns, figuring t=
hat=E2=80=99s a decent indicator of how the rubber is hooked up.
Sent from my iPhone
> On Jul 12, 2021, at 8:07 AM, Ponostyle <ponobill@gmail.com> wrote:
>=20
> =EF=BB=BFYou can play with these suspension settings and try to detect the=
effect of the changes, assuming you have some way of obtaining an infinite a=
mount 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 initi=
ally dialed in Peyote and the results were good. These are dynamic systems w=
ith 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 go=
ing on. The biggest problem then becomes modeling our ancient cars with thei=
r odd suspension components that no modern engineer would ever dream of usin=
g 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 wil=
l never be completely accurate=E2=80=94but it=E2=80=99s a lot closer than cu=
t and try will get you.=20
>=20
> Bill Babcock
> Beach Bum
> bill@ponostyle.com
> https://www.Ponostyle.com
>=20
>> On Jul 12, 2021, at 4:40 AM, Scott Janzen via Fot <fot@autox.team.net> wr=
ote:
>>=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 degr=
ees. Stock is 4, +/- 1. I have to admit I have never tried to adjust this u=
p 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 outsid=
e wheel. However, now you=E2=80=99ve got me thinking, and I may dial it bac=
k 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 cam=
ber settings.
>>=20
>> You can also adjust the castor by playing with the amount of shims front a=
nd rear on the lower a-arm, which will move the trunnion end of the A-arm fr=
ont 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 bendin=
g the steering links down. Very little bump steer within the normal operati=
ng 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 <fot@autox.tea=
m.net> wrote:
>>=20
>> could anyone racing a GT6 (or even a Spitfire) please offer some comment o=
n front alignment "settings". In particular, have you made engineering chang=
es to increase the static caster?=20
>>=20
>> The most obvious option is to change to the trunnionless vertical links u=
sed 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 m=
any 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
>> _______________________________________________
>> 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/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@ponost=
yle.com
>>=20
>>=20
>=20
--Apple-Mail-6E8F9104-4E4A-44CA-ADF2-C3D5C9C843C2
charset=utf-8
Content-Transfer-Encoding: quoted-printable
<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">I also just monitor tire temp across the tr=
ead and wear patterns, figuring that=E2=80=99s a decent indicator of how the=
rubber is hooked up.<br><br><div dir=3D"ltr">Sent from my iPhone</div><div d=
ir=3D"ltr"><br><blockquote type=3D"cite">On Jul 12, 2021, at 8:07 AM, Ponost=
yle <ponobill@gmail.com> wrote:<br><br></blockquote></div><blockquote t=
ype=3D"cite"><div dir=3D"ltr">=EF=BB=BF<meta http-equiv=3D"Content-Type" con=
tent=3D"text/html; charset=3Dutf-8">You can play with these suspension setti=
ngs and try to detect the effect of the changes, assuming you have some way o=
f obtaining an infinite amount of track time or a skid pad (limited but usef=
ul) to do the testing, or you could get a simulation program to play with. T=
hat=E2=80=99s how I initially dialed in Peyote and the results were good. Th=
ese are dynamic systems with a lot of variables that interact. It=E2=80=99s n=
ot easy to optimize, but a good suspension simulation program can model ever=
ything that=E2=80=99s going on. The biggest problem then becomes modeling ou=
r ancient cars with their odd suspension components that no modern engineer w=
ould 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=99=
s 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@ponost=
yle.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 J=
ul 12, 2021, at 4:40 AM, Scott Janzen via Fot <<a href=3D"mailto:fot@auto=
x.team.net" class=3D"">fot@autox.team.net</a>> wrote:</div><br class=3D"A=
pple-interchange-newline"><div class=3D""><meta http-equiv=3D"Content-Type" c=
ontent=3D"text/html; charset=3Dutf-8" class=3D""><div style=3D"word-wrap: br=
eak-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: spac=
e; 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 c=
lass=3D"">I run Toyo R888Rs - radials. They like negative camber. &nb=
sp;</div><div class=3D""><br class=3D""></div><div class=3D"">Fronts - 2.6 d=
egrees negative camber, 1/16=E2=80=9D toe in, castor 6 degrees. Stock i=
s 4, +/- 1. I have to admit I have never tried to adjust this up or do=
wn. With more castor, I think the camber gets a little more negative w=
ith turn-in, which is probably good as it counters body roll on the outside w=
heel. However, now you=E2=80=99ve got me thinking, and I may dial it b=
ack to stock to see if I notice the difference.</div><div class=3D""><br cla=
ss=3D""></div><div class=3D"">Rears - 2.5 degrees negative camber, sli=
ght 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 interchangeab=
le with these camber settings.</div><div class=3D""><br class=3D""></div><di=
v class=3D"">You can also adjust the castor by playing with the amount of sh=
ims front and rear on the lower a-arm, which will move the trunnion end of t=
he 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 th=
e steering links down. Very little bump steer within the normal operat=
ing range.</div><div class=3D""><br class=3D""></div><div class=3D"">Be curi=
ous 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 slidi=
ng 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:</di=
v><br class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" c=
lass=3D"">could anyone racing a GT6 (or even a Spitfire) please offer some c=
omment on front alignment "settings". In particular, have you made engineeri=
ng 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 trunnion=
less 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 suita=
ble 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 y=
ears, and my memory was the "stock" front end was not good with "modern" sli=
cks and particularly mid-corner indecision. </div><div class=3D""><br c=
lass=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 c=
lass=3D""></div><div class=3D"">Terry </div><div class=3D"">Australia</=
div></div></div>
_______________________________________________<br class=3D""><a href=3D"mai=
lto:fot@autox.team.net" class=3D"">fot@autox.team.net</a><br class=3D""><br c=
lass=3D""><a href=3D"http://www.fot-racing.com"; class=3D"">http://www.fot-ra=
cing.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.n=
et/pipermail/fot<br class=3D"">Unsubscribe/Manage: http://autox.team.net/mai=
lman/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://www.team.net/donate.html<br=
class=3D"">Archive: http://autox.team.net/archive http://www.team.net/piper=
mail/fot<br class=3D"">Unsubscribe/Manage: http://autox.team.net/mailman/opt=
ions/fot/bill@ponostyle.com<br class=3D""><br class=3D""><br class=3D""></di=
v></blockquote></div><br class=3D""></div></div></blockquote></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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