North American Turbocoupe Organization

What RPM to set timing
mchenpa Offline
Junior Member
Removing the spout is new for me but I get it in theory … taking the ECU out of the equation. When I do that will it take the IAC out of the mix and drop the idle to drop down to the base idle.

I’m trying to figure out what to expect since the IAC makes a 300-400 RPM difference and it seems like that would matter. 

Thanks in advance,

Jeff K Offline
With the SPOUT plug removed factory base timing should be 10 deg BTDC. Timing does not change with RPM when the SPOUT is removed.

Many of us add a few degrees of base timing (total timing with SPUT removed) to 12 to 14 deg for a little better off the line grunt.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized

mchenpa Offline
Junior Member

I’ve been traveling a bit for work and getting ready to tackle plugs and timing before I dig into adjusting, or analyzing, the TPS to figure out this high idle.

Appreciate the information

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