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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>Jason,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>Thanks – this is very helpful! We do plan to run it first on a test stand, then dyno it later once on the car. So, that will give us an opportunity to tweak it further. But, this is a good baseline starting point.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>Mark<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> JS Performance Motoring, LLC [mailto:jason@jsperformancemotoring.com] <br><b>Sent:</b> Friday, October 24, 2025 9:32 AM<br><b>To:</b> Mark Cook<br><b>Cc:</b> Friends of Triumph<br><b>Subject:</b> Re: [Fot] 123ingition distributor settings<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Hi Mark,<o:p></o:p></p></div><div><p class=MsoNormal> For a racing setup, you spend most of your time in the upper RPM range that would be "all in" advance on a mechanical distributor. I'd recommend starting with an advance curve that mimics that, then fine tuning for small gains on the dyno if you have the chance. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>My typical starting point for a curve is a very simple line that starts advancing at 2000 rpm, then maxes out advancing around 4000 rpm. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>No added advance below 2000 rpm makes it easier to verify your idle advance with a timing light accurately.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I prefer to install the programmable distributors at 16 or so degrees static, NOT at TDC. This helps with starting, and also improves rotor phasing at max advance.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>On the 123's, the rev limiter setting isn't always 100% accurate, sometimes you need to program the rev limit a few hundred RPM higher than intended. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I've attached a picture showing an example of a basic starting point for the advance curve.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><div><div><div><div><div><div><div><div><p class=MsoNormal>Jason Sukey<o:p></o:p></p></div><div><p class=MsoNormal>JS Performance Motoring, LLC<o:p></o:p></p></div><div><p class=MsoNormal>440.984.7720<o:p></o:p></p></div><div><p class=MsoNormal><a href="mailto:jason@jsperformancemotoring.com" target="_blank">jason@jsperformancemotoring.com</a><o:p></o:p></p></div><div><p class=MsoNormal><a href="http://www.jspmparts.com" target="_blank">www.jspmparts.com</a><o:p></o:p></p></div><div><p class=MsoNormal><a href="https://www.facebook.com/JSPerformanceMotoring/" target="_blank">https://www.facebook.com/JSPerformanceMotoring/</a><o:p></o:p></p></div></div></div></div></div></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Thu, Oct 23, 2025 at 3:18 PM Mark Cook via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>All,<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>I am installing a 123ignition distributor (laptop programmable) into my "project" TR6 race car. Wondering if anyone has this installed on their TR6 (or 250) race car with triple weber 45 DCOEs. I thought about downloading the tuning curves from the 123 disti in my running #95 TR6 race car as a starting point:.<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>I realize the camshaft would make a difference in the settings, so my specs below. Both have 1.55 roller rockers. Thoughts?<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>The "project" car engine has a Racetorations race camshaft, triple Weber 45 DCOE and a CR of about 12.5:1. The camshaft specs are:<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Peak Diff: Exh / Intake / LCA - 108.0 / 107.0 / 106.0<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Duration: Intake / Exhaust - 336<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Cam Lift: Intake / Exhaust - 370<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Checking Clearance: Intake / Exhaust - 0.010"<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Valve timing (at checking clearance) - Exhaust: Opens 96 BBDC / Closes 60 ATDC, Intake: Opens 62 BTDC / Closes 94 ABDC<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>The camshaft specs in my running TR6 are:<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Peak Diff: Exh / Intake / LCA - 105.0 /103.0 / NA<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Duration: Intake / Exhaust - 320<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Cam Lift: Intake / Exhaust - 340<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Checking Clearance: Intake / Exhaust - 0.010" (I think, but not certain)<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Valve timing (at checking clearance) - Exhaust: Opens 87 BBDC / Closes 53 ATDC, Intake: Opens 57 BTDC / Closes 83 ABDC<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Thanks,<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'>Mark Cook<o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p><p style='margin:0.1rem 0px'><span style='font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br><a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a><br><br><a href="http://www.fot-racing.com" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://autox.team.net/archive" target="_blank">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fotUnsubscribe/Manage" target="_blank">http://www.team.net/pipermail/fot<br>Unsubscribe/Manage</a>: <a href="http://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com" target="_blank">http://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com</a><br><br><o:p></o:p></p></blockquote></div></div></body></html>