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Greg, you did not mention what ratios you have. During my short racing
career I tried numerous gear combinations. 20% jumps seem to be about
right for the upper gears in our cars, which is what a standard A-type
overdrive gives (22% or 0.82). The standard gearbox ratios give about a
30% jump between 3rd and 4th, while the close ratio gears are closer to
20%, so standard gears give a 3rd overdrive which is 10% lower than 4th,
while with a close ratio box they are essentially the same. The
advantage of the overdrive is to give a useable gear between 2nd and
3rd. I don't see how you can improve on the combination of an OD and
close ratio box with a 4.55 rear. I found it useful to have two ways to
get the same gear because sometimes it is easier/quicker to shift the OD
rather than the transmission. Everyone say overdrives are temperamental
and add weight. I never found mine to be a problem and a small
improvement in gearing can easily make up for the extra weight.
The alternative OD ratios I've seen are larger than 20%. You'd have to
go to a very large OD ratio to get a useable 3rd-OD which is between 3rd
and 4th. Some of the alternate OD ratios are probably better for highway
cruising.
On 11/15/2021 5:10 AM, Enquiries Road & Track via Fot wrote:
> there are several different overdrive ratios, you need to change the
> sun gear , annulus and 3-gear set
>
> Terry
>
>
> On Mon, Nov 15, 2021 at 11:24 AM Bob Kramer via Fot
> <fot@autox.team.net> wrote:
>
> JK Jackson had that all figured out for a non overdrive box with
> the goal to get a better 2-3 spread.
>
> Sent from my iPhone
>
> > On Nov 14, 2021, at 6:36 PM, Greg Blake via Fot
> <fot@autox.team.net> wrote:
> >
> > Iâ??ve been inspecting the gears I took out of my race car.
> Second gear appears to have the slightest blue tinge to its color
> now. Is there a way to check if there is some damage caused by
> over heating? Everything seems good from a tolerance perspective,
> just concerned about the slight blue color.
> >
> > Related note. Is there a combination of gears I can use out of
> different gearboxes to give a better split between 3, 3OD, and
> 4th? Right now I just skip 3OD because it is very close to 4th. I
> have a ton of gearboxes laying around, so if there is a
> combination I should try Iâ??d love to give it a shot.
> >
> > Sent from my iPhone
> > _______________________________________________
> > fot@autox.team.net
> >
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> >
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> >
> >
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>
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Greg, you did not mention what ratios you have. During my short
racing career I tried numerous gear combinations. 20% jumps seem to
be about right for the upper gears in our cars, which is what a
standard A-type overdrive gives (22% or 0.82). The standard gearbox
ratios give about a 30% jump between 3rd and 4th, while the close
ratio gears are closer to 20%, so standard gears give a 3rd
overdrive which is 10% lower than 4th, while with a close ratio box
they are essentially the same. The advantage of the overdrive is to
give a useable gear between 2nd and 3rd. I don't see how you can
improve on the combination of an OD and close ratio box with a 4.55
rear. I found it useful to have two ways to get the same gear
because sometimes it is easier/quicker to shift the OD rather than
the transmission. Everyone say overdrives are temperamental and add
weight. I never found mine to be a problem and a small improvement
in gearing can easily make up for the extra weight.<br>
<br>
The alternative OD ratios I've seen are larger than 20%. You'd have
to go to a very large OD ratio to get a useable 3rd-OD which is
between 3rd and 4th. Some of the alternate OD ratios are probably
better for highway cruising.<br>
<br>
<div class="moz-cite-prefix">On 11/15/2021 5:10 AM, Enquiries Road
& Track via Fot wrote:<br>
</div>
<blockquote type="cite"
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">there are several different overdrive ratios, you
need to change the sun gear , annulus and 3-gear set
<div><br>
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<div>Terry <br clear="all">
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<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Nov 15, 2021 at 11:24
AM Bob Kramer via Fot <<a href="mailto:fot@autox.team.net";
moz-do-not-send="true"
class="moz-txt-link-freetext">fot@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">JK
Jackson had that all figured out for a non overdrive box with
the goal to get a better 2-3 spread.<br>
<br>
Sent from my iPhone<br>
<br>
> On Nov 14, 2021, at 6:36 PM, Greg Blake via Fot <<a
href="mailto:fot@autox.team.net"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">fot@autox.team.net</a>>
wrote:<br>
> <br>
> Iâ??ve been inspecting the gears I took out of my race
car. Second gear appears to have the slightest blue tinge to
its color now. Is there a way to check if there is some damage
caused by over heating? Everything seems good from a
tolerance perspective, just concerned about the slight blue
color. <br>
> <br>
> Related note. Is there a combination of gears I can use
out of different gearboxes to give a better split between 3,
3OD, and 4th? Right now I just skip 3OD because it is very
close to 4th. I have a ton of gearboxes laying around, so if
there is a combination I should try Iâ??d love to give it a
shot. <br>
> <br>
> Sent from my iPhone<br>
> _______________________________________________<br>
> <a href="mailto:fot@autox.team.net"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">fot@autox.team.net</a><br>
> <br>
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target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://www.fot-racing.com</a><br>
> <br>
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</blockquote>
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<pre class="moz-quote-pre"
wrap="">_______________________________________________
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