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Jason,
=20
Thanks =E2=80=93 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.
=20
Regards,
=20
Mark
=20
From: JS Performance Motoring, LLC =
[mailto:jason@jsperformancemotoring.com]=20
Sent: Friday, October 24, 2025 9:32 AM
To: Mark Cook
Cc: Friends of Triumph
Subject: Re: [Fot] 123ingition distributor settings
=20
Hi Mark,
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. =20
=20
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. =20
=20
No added advance below 2000 rpm makes it easier to verify your idle =
advance with a timing light accurately.
=20
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.
=20
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. =20
=20
I've attached a picture showing an example of a basic starting point for =
the advance curve.
=20
=20
=20
Jason Sukey
JS Performance Motoring, LLC
440.984.7720
jason@jsperformancemotoring.com
www.jspmparts.com
https://www.facebook.com/JSPerformanceMotoring/
=20
=20
On Thu, Oct 23, 2025 at 3:18=E2=80=AFPM Mark Cook via Fot =
<fot@autox.team.net> wrote:
All,
=20
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:.
I realize the camshaft would make a difference in the settings, so my =
specs below. Both have 1.55 roller rockers. Thoughts?
=20
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:
=20
Peak Diff: Exh / Intake / LCA - 108.0 / 107.0 / 106.0
Duration: Intake / Exhaust - 336
Cam Lift: Intake / Exhaust - 370
Checking Clearance: Intake / Exhaust - 0.010"
Valve timing (at checking clearance) - Exhaust: Opens 96 BBDC / Closes =
60 ATDC, Intake: Opens 62 BTDC / Closes 94 ABDC
=20
The camshaft specs in my running TR6 are:
=20
Peak Diff: Exh / Intake / LCA - 105.0 /103.0 / NA
Duration: Intake / Exhaust - 320
Cam Lift: Intake / Exhaust - 340
Checking Clearance: Intake / Exhaust - 0.010" (I think, but not =
certain)
Valve timing (at checking clearance) - Exhaust: Opens 87 BBDC / Closes =
53 ATDC, Intake: Opens 57 BTDC / Closes 83 ABDC
=20
=20
Thanks,
=20
Mark Cook
=20
=20
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot =
<http://www.team.net/pipermail/fotUnsubscribe/Manage>=20
http://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com=
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-family:"Arial","sans-serif";color:#1F497D'>Jason,<o:p></o:p=
></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p=
></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Arial","sans-serif";color:#1F497D'>Thanks =
=E2=80=93 this is very helpful!=C2=A0 We do plan to run it first on a =
test stand, then dyno it later once on the car.=C2=A0 So, that will give =
us an opportunity to tweak it further.=C2=A0 But, this is a good =
baseline starting point.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p=
></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Arial","sans-serif";color:#1F497D'>Regards,<o:p></o=
:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p=
></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Arial","sans-serif";color:#1F497D'>Mark<o:p></o:p><=
/span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p=
></span></p><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'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=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>Hi =
Mark,<o:p></o:p></p></div><div><p class=3DMsoNormal> =
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=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>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=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>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=3DMsoNormal><o:p> </o:p></p></div><div><p class=3DMsoNormal>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=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>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=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>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=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><div><div><div><div><di=
v><div><div><div><div><p class=3DMsoNormal>Jason =
Sukey<o:p></o:p></p></div><div><p class=3DMsoNormal>JS Performance =
Motoring, LLC<o:p></o:p></p></div><div><p =
class=3DMsoNormal>440.984.7720<o:p></o:p></p></div><div><p =
class=3DMsoNormal><a href=3D"mailto:jason@jsperformancemotoring.com"; =
target=3D"_blank">jason@jsperformancemotoring.com</a><o:p></o:p></p></div=
><div><p class=3DMsoNormal><a href=3D"http://www.jspmparts.com"; =
target=3D"_blank">www.jspmparts.com</a><o:p></o:p></p></div><div><p =
class=3DMsoNormal><a =
href=3D"https://www.facebook.com/JSPerformanceMotoring/"; =
target=3D"_blank">https://www.facebook.com/JSPerformanceMotoring/</a><o:p=
></o:p></p></div></div></div></div></div></div></div></div></div></div><p=
class=3DMsoNormal><o:p> </o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>On =
Thu, Oct 23, 2025 at 3:18=E2=80=AFPM Mark Cook via Fot <<a =
href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><p style=3D'margin:0.1rem =
0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'>All,<o:p></o:p></s=
pan></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'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=3D'margin:0.1rem 0px'><span =
style=3D'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=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'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=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'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=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'>Duration: Intake =
/ Exhaust - 336<o:p></o:p></span></p><p style=3D'margin:0.1rem =
0px'><span style=3D'font-family:"Arial","sans-serif";color:black'>Cam =
Lift: Intake / Exhaust - 370<o:p></o:p></span></p><p =
style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'>Checking =
Clearance: Intake / Exhaust - 0.010"<o:p></o:p></span></p><p =
style=3D'margin:0.1rem 0px'><span =
style=3D'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=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'>The camshaft =
specs in my running TR6 are:<o:p></o:p></span></p><p =
style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'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=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'>Duration: Intake =
/ Exhaust - 320<o:p></o:p></span></p><p style=3D'margin:0.1rem =
0px'><span style=3D'font-family:"Arial","sans-serif";color:black'>Cam =
Lift: Intake / Exhaust - 340<o:p></o:p></span></p><p =
style=3D'margin:0.1rem 0px'><span =
style=3D'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=3D'margin:0.1rem 0px'><span =
style=3D'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=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'>Thanks,<o:p></o:p>=
</span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'>Mark =
Cook<o:p></o:p></span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p><p style=3D'margin:0.1rem 0px'><span =
style=3D'font-family:"Arial","sans-serif";color:black'> <o:p></o:p><=
/span></p></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br><a href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank">fot@autox.team.net</a><br><br><a =
href=3D"http://www.fot-racing.com"; =
target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a =
href=3D"http://www.team.net/donate.html"; =
target=3D"_blank">http://www.team.net/donate.html</a><br>Archive: <a =
href=3D"http://autox.team.net/archive"; =
target=3D"_blank">http://autox.team.net/archive</a> <a =
href=3D"http://www.team.net/pipermail/fotUnsubscribe/Manage"; =
target=3D"_blank">http://www.team.net/pipermail/fot<br>Unsubscribe/Manage=
</a>: <a =
href=3D"http://autox.team.net/mailman/options/fot/jason@jsperformancemoto=
ring.com" =
target=3D"_blank">http://autox.team.net/mailman/options/fot/jason@jsperfo=
rmancemotoring.com</a><br><br><o:p></o:p></p></blockquote></div></div></b=
ody></html>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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