Quote:
Originally Posted by dap930
Kenik,
Since your at 8.3 CR, I think it is a good starting point for twin plug. At 8.3:1 your effective CR is going to be higher when you get into boost. You can add 3 or 4* in the 65KPA and below rows for your cruise areas as you will want lean mixtures (at least 14.7:1) here for MPG. You can safely add 2* to your 195KPA row. I run a little more advance than you, but I am only 7:1 CR at best after mods when I rebuilt my 3.0 liter.
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This will be an interesting exercise. My cams are have lower dynamic compression than most turbo cams, so went with higher static CR pistons to make up the difference, off idle. If you look at the spreadsheet below, you'll quickly see the fine interplay that exists between static compression, dynamic compression at idle and dynamic compression at full boost.
My hypothesis is that one can make qualified ballpark estimates on tuning parameters from superficially different configurations, so long as you have the full complement of compression calculations as basis.
(ignore the head volume values - I fudged them to get the desired calculated static CR values, for simplicity's sake)
