Brian,
Would love to see someone build a flow bench to re-profile the metering assembly. Could be a major, major contribution.
Quote:
Originally Posted by RarlyL8
...What I mean by locking it down is to disable any vacuum/boost advance/retard function and set the timing at 26 @4K as a base. Then alter the mechanical curve and add back any vac/boost advance/retard function you wish.
Nothing magical.
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Got it.
We discussed that possibility/method earlier.
My thought being it is best to start on a dyno with an operator that knows how to get the most out of a motor without going over the top. First to set the "on boost goal" (-26 mightt be leaving power on the table or might be to much for a given motor). Then find the off idle timing goal. Then rebuild the mechanical advance section to fit.
I mightt add:
Disconnecting the vac/boost signal to a Euro and working the mechanical advance should be good as the vac advance is just for cruse.
With a US or 930 dist with the double pot, I would caution that we would need to leave the Boost-Retard side hooked up. We could disconnect the Vac-Retard side or we would not have boost retard and would be running -26 deg on boost which is to much timing on boost to be safe.
On a dual pot, I am thinking I would just leave the Vac-Ret off all together. I believe when Andial sets up a distributor for a customer they say to just hook up the Boost-Retard side and leave the vacuum-retard side off.
In total, I suspect there is solid gain and or piece of mind to be had in the "on boost" section. There should be solid gain to be had in the area off idle on the way to full boost.