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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
Posts: 3,861
This timing stuff will make your head spin and keep you awake at night trying to understand it. I think Jim did a good job explaining, as well as can be done with a keyboard.

I do not have WMI and I think I'm ok without it because when on full boost all the extra timing I added at idle has all been shaved off by the MSD 8762 and by the boost retard to the vacuum pot to where I'm left in the normal timing safety zone for these cars (maybe a degree or two more, but I don't have the means to test the actual under-boost timing). WMI becomes critical when running higher boost numbers, higher timing advance, higher compression ratios, and/or crappy lower octane gas...or any combination of those.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 04-20-2013, 08:15 PM
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