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

From: Michael Deweerd via Fot <[email-masked]>
Date: Wed, 1 Mar 2023 22:24:44 -0500

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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*

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<div dir=3D"ltr">Amici, For the kastner cup Race at Road America what would=
 be the ideal rear end=C2=A0ratio for a TR4?=C2=A0 Last time (2013) it seem=
ed I could have used a lower ratio?<div>Would a 3.50 be the better choice o=
ver the 4.10 I have in the car now?<br clear=3D"all"><div>I Redline at 6000=
 RPM.=C2=A0=C2=A0</div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" da=
ta-smartmail=3D"gmail_signature"><div dir=3D"ltr"><i><font face=3D"comic sa=
ns ms, sans-serif">Mike Deweerd</font></i></div></div></div></div>

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From: Greg Blake via Fot <[email-masked]>
Date: Thu, 2 Mar 2023 09:19:10 -0600

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Mike,<div><br></div><div>Although I=E2=80=99=
ve never raced at Road America, I tend to agree with Jack=E2=80=99s recommen=
dation. I run my TR3 with that same gear box and rear end. My engine can rev=
 to 7000 but I typically shift at 6000 due to where my torque is made. In Ja=
nuary at COTA, I was turning fastest laps of the Triumphs and consistently p=
lacing on top 3, in group 2. I find with the TR3, I=E2=80=99m limited by aer=
o at about 120mph which is well below 7000 rpm.&nbsp;</div><div><br></div><d=
iv>I=E2=80=99d never consider going to a lower rear end ratio for racing, yo=
u will loose too much coming out of the corners.&nbsp;</div><div><br></div><=
div>Greg<br><br><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><=
br><blockquote type=3D"cite">On Mar 2, 2023, at 08:25, Jack Wheeler via Fot &=
lt;[email-masked]&gt; wrote:<br><br></blockquote></div><blockquote type=3D=
"cite"><div dir=3D"ltr">=EF=BB=BF<div class=3D"ydp42066f61yahoo-style-wrap" s=
tyle=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:1=
3px;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"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 r=
ear 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 g=
ear for the tight corners (turn 5 and Canada corner) and the overdrive gave m=
e plenty of top end.&nbsp; Of course my red line was a little higher than yo=
urs (7.000) so you might have to adjust accordingly.&nbsp; Good luck.</div><=
div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=
=3D"false">Jack<br></div><div><br></div>
       =20
        </div><div id=3D"ydpf978ec8byahoo_quoted_8648065267" class=3D"ydpf97=
8ec8byahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, sa=
ns-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Thursday, March 2, 2023 at 03:49:31 AM EST, Michael D=
eweerd via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydpf978ec8byiv9958688586"><div dir=3D"ltr">A=
mici, For the kastner cup Race at Road America what would be the ideal rear e=
nd&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 t=
he car now?<br clear=3D"all"><div>I Redline at 6000 RPM.&nbsp;&nbsp;</div>--=
 <br><div dir=3D"ltr" class=3D"ydpf978ec8byiv9958688586gmail_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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