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<div dir="ltr" data-setdir="false">Not to beat a dead horse, but with your setup, the 4.10 would be the best bet. You'll use the 1:1 and the overdrive gears only.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Lime rock "standard" times for small bore production cars, lap average speeds are close to 90 MPH. Sidebar: the track has one of the highest if not the highest average lap speed for any track in the USofA. The slowest corner on the track is the exit of Big Bend and if you get the line perfect, you're at 65 to 70 MPH. The left hander is a tosser, so don't even try to gear for that. The most critical corner is West Bend because you carry that "Mo" all the way to the entry to Big Bend.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I'll also +1 the tire diameter - I assume 23" - 24" diameter tires with a nod towards 24". Smaller than that, you need the 3.70, for sure.</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</div><div><br></div>
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On Monday, March 24, 2025 at 11:59:39 PM EDT, Dave Riddle via Fot <fot@autox.team.net> wrote:
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<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">While we will be running the Toyota 5 speed in the TR4 at Lime Rock that gear box and engine are slated to go back in the BajaTR3 afterwards. The motor that is being built for the TR4 is being mated to a
4-speed TR4 box that has been order. Trying to determine what gear ratios to run in it. Will have both a 3.71 and 4.11 final drive and the motor turning over at 6k with about 175 hp at the rear wheels.</span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">Currently the Toyota boxes we have are running…</span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">1<sup>st</sup> 3.950 3.830</span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">2<sup>nd</sup> 2.140 2.060</span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">3<sup>rd</sup> 1.38 1.430</span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">4<sup>th</sup> 1.00 1.00</span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">5<sup>th</sup> 0.810 0.840</span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;"> </span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">Anyone care to share the hot setup for a 4-speed TR4 box?</span></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;"> </span></p>
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<p class="ydpf1823c49yiv4011974499MsoNormal"><b>Dave Riddle</b></p>
<p class="ydpf1823c49yiv4011974499MsoNormal"><span style="font-size:11.0pt;">Business IT Consulting</span></p>
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<span style="color:blue;">dave@microworks.net</span></a></span></p>
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<span style="color:blue;">http://www.microworks.net</span></a></span></p>
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