'66 Slant Six Turbo Build

stop the beast said

Hi Bill,


Total timing is at 38, under boost the msd box is pulling a a degree per pound up to a bar and 1.5 degree past a bar, based on the reading from the MAP sensor.

Essentially, under 16.5 psi we should end up pulling about 18.5 degrees for timing of 19.5.

:-D

Click to expand...

One question: The MSD website says, "The Boost Timing Master allows you to adjust the amount of ignition retard from 1° per pound of boost to 3° per pound via a control knob that you mount on the dashboard. This way you can make adjustments on the fly to prevent detonation as fuel quality or altitude and air quality changes up to a maximum of 15° retard."

If you are running 38 degrees total, and the Boostmaster retards it 15 degrees (which is the most it can retard it, according to their ad,) you end up with 38 minus 15, or 23 degrees of advance.

That's about 5 degrees too much. Is there some other retard feature that I don't know about that you are using? If not, could that detonation you expereienced be due to that 23 degrees of advance?

I obviously don't understand how you're getting 18 degrees with this setup.

Please let me know... I have one of those Boost Timing Masters on my supercharged 360 Magnum engine in my '72 Valiant.

Thanks for any information!!!