Subject: Re: [Fot] Road America - Best gear ratio?

From: "rocky spitfire4.com via Fot" <[email-masked]>
Date: Thu, 2 Mar 2023 09:49:11 +0000

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_______________________________________________
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From: Jack Wheeler via Fot <[email-masked]>
Date: Thu, 2 Mar 2023 14:08:39 +0000 (UTC)

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 Hi Mike.=C2=A0 I won The June Sprints at Road America in 1989 and 1991 wit=
h my TR-4.=C2=A0 I used a 4.3 rear end gear and a close ratio (Dolomite) ge=
arbox with overdrive.=C2=A0 Same set-up I used at Road Atlanta for The Runo=
ffs.=C2=A0 The 4.3 gives a good gear for the tight corners (turn 5 and Cana=
da corner) and the overdrive gave me plenty of top end.=C2=A0 Of course my =
red line was a little higher than yours (7.000) so you might have to adjust=
 accordingly.=C2=A0 Good luck.
Jack

    On Thursday, March 2, 2023 at 03:49:31 AM EST, Michael Deweerd via Fot =
<[email-masked]> wrote: =20
=20
 Amici, For the kastner cup Race at Road America what would be the ideal re=
ar end=C2=A0ratio for a TR4?=C2=A0 Last time (2013) it seemed I could have =
used a lower ratio?Would a 3.50 be the better choice over the 4.10 I have i=
n the car now?
I Redline at 6000 RPM.=C2=A0=C2=A0--=20
Mike Deweerd_______________________________________________
[email-masked]

yahoo.com

 =20
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        <div dir="ltr" data-setdir="false">Hi Mike.&nbsp; I won The June Sprints at Road America in 1989 and 1991 with my TR-4.&nbsp; I used a 4.3 rear end gear and a close ratio (Dolomite) gearbox with overdrive.&nbsp; Same set-up I used at Road Atlanta for The Runoffs.&nbsp; The 4.3 gives a good gear for the tight corners (turn 5 and Canada corner) and the overdrive gave me plenty of top end.&nbsp; Of course my red line was a little higher than yours (7.000) so you might have to adjust accordingly.&nbsp; Good luck.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Jack<br></div><div><br></div>
        
        </div><div id="ydpf978ec8byahoo_quoted_8648065267" class="ydpf978ec8byahoo_quoted">
            <div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
                
                <div>
                    On Thursday, March 2, 2023 at 03:49:31 AM EST, Michael Deweerd via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id="ydpf978ec8byiv9958688586"><div dir="ltr">Amici, For the kastner cup Race at Road America what would be the ideal rear end&nbsp;ratio for a TR4?&nbsp; Last time (2013) it seemed I could have used a lower ratio?<div>Would a 3.50 be the better choice over the 4.10 I have in the car now?<br clear="all"><div>I Redline at 6000 RPM.&nbsp;&nbsp;</div>-- <br><div dir="ltr" class="ydpf978ec8byiv9958688586gmail_signature"><div dir="ltr"><i><font face="comic sans ms, sans-serif">Mike Deweerd</font></i></div></div></div></div>
</div>_______________________________________________<br><a href="mailto:[email-masked]" rel="nofollow" target="_blank">[email-masked]</a><br><br><a href="http://www.fot-racing.com" rel="nofollow" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" rel="nofollow" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://autox.team.net/archive " rel="nofollow" target="_blank">http://autox.team.net/archive </a><a href="http://www.team.net/pipermail/fot" rel="nofollow" target="_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/[email-masked]" rel="nofollow" target="_blank">http://autox.team.net/mailman/options/fot/[email-masked]</a><br><br><br></div>
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From: Robert Lang via Fot <[email-masked]>
Date: Thu, 2 Mar 2023 14:53:08 +0000 (UTC)

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 Road America is a high-speed track. You won't get under 3:00 with a 4.10. =
You'll be out of revs half-way down most of the straights. a 3.70 or 3.45 w=
ould be better choices. Gear for 115+ on the front straight, the back strai=
ght and the Kink to Canada.
Regards,Bob Lang

    On Thursday, March 2, 2023 at 03:39:29 AM EST, Michael Deweerd via Fot =

@yahoo.com

 =20
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        <div dir="ltr" data-setdir="false">Road America is a high-speed track. You won't get under 3:00 with a 4.10. You'll be out of revs half-way down most of the straights. a 3.70 or 3.45 would be better choices. Gear for 115+ on the front straight, the back straight and the Kink to Canada.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Regards,</div><div dir="ltr" data-setdir="false">Bob Lang<br></div><div><br></div>
        
        </div><div id="ydped3157aayahoo_quoted_8235629039" class="ydped3157aayahoo_quoted">
            <div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
                
                <div>
                    On Thursday, March 2, 2023 at 03:39:29 AM EST, Michael Deweerd via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id="ydped3157aayiv2522124888"><div dir="ltr">Amici, For the kastner cup Race at Road America what would be the ideal rear end&nbsp;ratio for a TR4?&nbsp; Last time (2013) it seemed I could have used a lower ratio?<div>Would a 3.50 be the better choice over the 4.10 I have in the car now?<br clear="all"><div>I Redline at 6000 RPM.&nbsp;&nbsp;</div>-- <br><div dir="ltr" class="ydped3157aayiv2522124888gmail_signature"><div dir="ltr"><i><font face="comic sans ms, sans-serif">Mike Deweerd</font></i></div></div></div></div>
</div>_______________________________________________<br><a href="mailto:[email-masked]" rel="nofollow" target="_blank">[email-masked]</a><br><br><a href="http://www.fot-racing.com" rel="nofollow" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" rel="nofollow" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://autox.team.net/archive " rel="nofollow" target="_blank">http://autox.team.net/archive </a><a href="http://www.team.net/pipermail/fot" rel="nofollow" target="_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/[email-masked]" rel="nofollow" target="_blank">http://autox.team.net/mailman/options/fot/[email-masked]</a><br><br><br></div>
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From: Tony Drews via Fot <[email-masked]>
Date: Thu, 2 Mar 2023 10:05:10 -0600

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Mike, when I ran an overdrive, I was running a 4.11 rear end. Without 
it, I run a 3.8 (Ford diff), and have seen 6300 or 6400 at the end of 
the straights, but that's a really hot lap.  I normally peak at 6100 or 
6200.  3.7 would be somewhat better, 3.5 I've not tried but should keep 
you under 6K.

Regards, Tony Drews

On 3/1/2023 9:24 PM, Michael Deweerd via Fot wrote:
> Amici, For the kastner cup Race at Road America what would be the 
> ideal rear end ratio for a TR4?  Last time (2013) it seemed I could 
> have used a lower ratio?
> Would a 3.50 be the better choice over the 4.10 I have in the car now?
> I Redline at 6000 RPM.
> -- 
> /Mike Deweerd/
>
> 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/[email-masked]
>
>
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    <p>Mike, when I ran an overdrive, I was running a 4.11 rear end. 
      Without it, I run a 3.8 (Ford diff), and have seen 6300 or 6400 at
      the end of the straights, but that's a really hot lap.  I normally
      peak at 6100 or 6200.  3.7 would be somewhat better, 3.5 I've not
      tried but should keep you under 6K.</p>
    <p>Regards, Tony Drews<br>
    </p>
    <div class="moz-cite-prefix">On 3/1/2023 9:24 PM, Michael Deweerd
      via Fot wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:[email-masked]">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">Amici, For the kastner cup Race at Road America
        what would be the ideal rear end ratio for a TR4?  Last time
        (2013) it seemed I could have used a lower ratio?
        <div>Would a 3.50 be the better choice over the 4.10 I have in
          the car now?<br clear="all">
          <div>I Redline at 6000 RPM.  </div>
          -- <br>
          <div dir="ltr" class="gmail_signature"
            data-smartmail="gmail_signature">
            <div dir="ltr"><i><font face="comic sans ms, sans-serif">Mike
                  Deweerd</font></i></div>
          </div>
        </div>
      </div>
      <br>
      <fieldset class="moz-mime-attachment-header"></fieldset>
      <pre class="moz-quote-pre" wrap="">_______________________________________________
<a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a>

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From: Robert Lang via Fot <[email-masked]>
Date: Thu, 2 Mar 2023 17:26:42 +0000 (UTC)

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 Addendum: 4.10 and o/d and you might be okay. Just checked my calcs on thi=
s. But 4.10 and no o/d and you'll redline in a lot of places at RA

Note: my assumptions are with 24 in tall tires on a TR6.
Also, I'm more concerned about chucking a rod or breaking the crank than ho=
w well I can pull out of any corner. So under 6k RPM is my rule of thumb.
Regards,rml

    On Thursday, March 2, 2023 at 11:39:15 AM EST, Robert Lang via Fot <fot=
@autox.team.net> wrote: =20
=20
  Road America is a high-speed track. You won't get under 3:00 with a 4.10.=
 You'll be out of revs half-way down most of the straights. a 3.70 or 3.45 =
would be better choices. Gear for 115+ on the front straight, the back stra=
ight and the Kink to Canada.
Regards,Bob Lang

 =20
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<html><head></head><body><div class=3D"ydp25996b88yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">Addendum: 4.10 and o/d and y=
ou might be okay. Just checked my calcs on this. But 4.10 and no o/d and yo=
u'll redline in a lot of places at RA<br></div><div dir=3D"ltr" data-setdir=
=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">Note: my assump=
tions are with 24 in tall tires on a TR6.</div><div dir=3D"ltr" data-setdir=
=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">Also, I'm more =
concerned about chucking a rod or breaking the crank than how well I can pu=
ll out of any corner. So under 6k RPM is my rule of thumb.</div><div dir=3D=
"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false=
">Regards,</div><div dir=3D"ltr" data-setdir=3D"false">rml<br></div><div><b=
r></div>
       =20
        </div><div id=3D"ydp7c2547dcyahoo_quoted_8374460356" class=3D"ydp7c=
2547dcyahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Thursday, March 2, 2023 at 11:39:15 AM EST, Robert L=
ang via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydp7c2547dcyiv3402212990"><div><div style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;" class=3D"ydp7c2547dcyiv3402212990ydpad244c79yahoo-style-wrap"><div></div=
        <div dir=3D"ltr">Road America is a high-speed track. You won't get =
under 3:00 with a 4.10. You'll be out of revs half-way down most of the str=
aights. a 3.70 or 3.45 would be better choices. Gear for 115+ on the front =
straight, the back straight and the Kink to Canada.</div><div dir=3D"ltr"><=
br clear=3D"none"></div><div dir=3D"ltr">Regards,</div><div dir=3D"ltr">Bob=
 Lang<br clear=3D"none"></div><div><br clear=3D"none"></div>
       =20
        </div><div id=3D"ydp7c2547dcyiv3402212990ydped3157aayahoo_quoted_82=
35629039" class=3D"ydp7c2547dcyiv3402212990ydped3157aayahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div id=3D"ydp7c2547dcyiv3402212990yqt76956" class=3D"ydp7c=
2547dcyiv3402212990yqt6751289428"><div>
                    On Thursday, March 2, 2023 at 03:39:29 AM EST, Michael =
Deweerd via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br clear=3D"none"></div>
                <div><br clear=3D"none"></div>
                <div><div id=3D"ydp7c2547dcyiv3402212990ydped3157aayiv25221=
24888"><div dir=3D"ltr">Amici, For the kastner cup Race at Road America wha=
t would be the ideal rear end&nbsp;ratio for a TR4?&nbsp; Last time (2013) =
it seemed I could have used a lower ratio?<div>Would a 3.50 be the better c=
hoice over the 4.10 I have in the car now?<br clear=3D"all"><div>I Redline =
at 6000 RPM.&nbsp;&nbsp;</div>-- <br clear=3D"none"><div dir=3D"ltr" class=
=3D"ydp7c2547dcyiv3402212990ydped3157aayiv2522124888gmail_signature"><div d=
ir=3D"ltr"><i><font face=3D"comic sans ms, sans-serif">Mike Deweerd</font><=
/i></div></div></div></div>
</div>_______________________________________________<br clear=3D"none"><a =
shape=3D"rect" href=3D"mailto:[email-masked]" rel=3D"nofollow" target=
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From: Jack Wheeler via Fot <[email-masked]>
Date: Thu, 2 Mar 2023 23:21:17 +0000 (UTC)

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 As a point of reference, I checked some of my old results sheets, and I wa=
s turning laps in the 2:41s with an SCCA legal TR-4 with slick tires.=C2=A0=
 This was 1989 - 1991, and I don't think the track has changed since then.
Jack

    On Thursday, March 2, 2023 at 03:49:35 PM EST, Robert Lang via Fot <fot=
@autox.team.net> wrote: =20
=20
  Addendum: 4.10 and o/d and you might be okay. Just checked my calcs on th=
is. But 4.10 and no o/d and you'll redline in a lot of places at RA

 =20
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<html><head></head><body><div class=3D"ydpecc1ed81yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">As a point of reference, I c=
hecked some of my old results sheets, and I was turning laps in the 2:41s w=
ith an SCCA legal TR-4 with slick tires.&nbsp; This was 1989 - 1991, and I =
don't think the track has changed since then.</div><div dir=3D"ltr" data-se=
tdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">Jack<br></d=
iv><div><br></div>
       =20
        </div><div id=3D"ydp20bfead2yahoo_quoted_8600128836" class=3D"ydp20=
bfead2yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Thursday, March 2, 2023 at 03:49:35 PM EST, Robert L=
ang via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydp20bfead2yiv6775035405"><div><div style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;" class=3D"ydp20bfead2yiv6775035405ydp25996b88yahoo-style-wrap"><div></div=
        <div dir=3D"ltr">Addendum: 4.10 and o/d and you might be okay. Just=
 checked my calcs on this. But 4.10 and no o/d and you'll redline in a lot =
of places at RA<br clear=3D"none"></div><div dir=3D"ltr"><br clear=3D"none"=
></div><div dir=3D"ltr">Note: my assumptions are with 24 in tall tires on a=
 TR6.</div><div dir=3D"ltr"><br clear=3D"none"></div><div dir=3D"ltr">Also,=
 I'm more concerned about chucking a rod or breaking the crank than how wel=
l I can pull out of any corner. So under 6k RPM is my rule of thumb.</div><=
div dir=3D"ltr"><br clear=3D"none"></div><div dir=3D"ltr">Regards,</div><di=
v dir=3D"ltr">rml<br clear=3D"none"></div><div><br clear=3D"none"></div>
       =20
        </div><div id=3D"ydp20bfead2yiv6775035405ydp7c2547dcyahoo_quoted_83=
74460356" class=3D"ydp20bfead2yiv6775035405ydp7c2547dcyahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div id=3D"ydp20bfead2yiv6775035405yqt93635" class=3D"ydp20=
bfead2yiv6775035405yqt9327784039"><div>
                    On Thursday, March 2, 2023 at 11:39:15 AM EST, Robert L=
ang via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br clear=3D"none"></div>
                <div><br clear=3D"none"></div>
                <div><div id=3D"ydp20bfead2yiv6775035405ydp7c2547dcyiv34022=
12990"><div><div style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;font-size:13px;" class=3D"ydp20bfead2yiv6775035405ydp7c2547dcyiv340=
2212990ydpad244c79yahoo-style-wrap"><div></div>
        <div dir=3D"ltr">Road America is a high-speed track. You won't get =
under 3:00 with a 4.10. You'll be out of revs half-way down most of the str=
aights. a 3.70 or 3.45 would be better choices. Gear for 115+ on the front =
straight, the back straight and the Kink to Canada.</div><div dir=3D"ltr"><=
br clear=3D"none"></div><div dir=3D"ltr">Regards,</div><div dir=3D"ltr">Bob=
 Lang<br clear=3D"none"></div><div><br clear=3D"none"></div>
       =20
        </div><div id=3D"ydp20bfead2yiv6775035405ydp7c2547dcyiv3402212990yd=
ped3157aayahoo_quoted_8235629039" class=3D"ydp20bfead2yiv6775035405ydp7c254=
7dcyiv3402212990ydped3157aayahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div id=3D"ydp20bfead2yiv6775035405ydp7c2547dcyiv3402212990=
yqt76956" class=3D"ydp20bfead2yiv6775035405ydp7c2547dcyiv3402212990yqt67512=
89428"><div>
                    On Thursday, March 2, 2023 at 03:39:29 AM EST, Michael =
Deweerd via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br clear=3D"none"></div>
                <div><br clear=3D"none"></div>
                <div><div id=3D"ydp20bfead2yiv6775035405ydp7c2547dcyiv34022=
12990ydped3157aayiv2522124888"><div dir=3D"ltr">Amici, For the kastner cup =
Race at Road America what would be the ideal rear end&nbsp;ratio for a TR4?=
&nbsp; Last time (2013) it seemed I could have used a lower ratio?<div>Woul=
d a 3.50 be the better choice over the 4.10 I have in the car now?<br clear=
=3D"all"><div>I Redline at 6000 RPM.&nbsp;&nbsp;</div>-- <br clear=3D"none"=
><div dir=3D"ltr" class=3D"ydp20bfead2yiv6775035405ydp7c2547dcyiv3402212990=
ydped3157aayiv2522124888gmail_signature"><div dir=3D"ltr"><i><font face=3D"=
comic sans ms, sans-serif">Mike Deweerd</font></i></div></div></div></div>
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