Well, we did the dyno session last weekend and it went good. We achieved our goals, which were to carry power all the way to redline - the old turbo setup was too restrictive on the exhaust and started causing too much backpressure, and power loss, above 5900rpm or so.
Dynoroom, what we did with the megasquirt was the exact same way we were running his MSD ignition. We have the engine running 36 degrees advance, even at light load, and at idle. Then as boost comes on, we ramp downwards to a total timing of 24 degrees, where it seemed happiest on the dyno. (power increase was falling off with additional timing). Really, the *only* benefit we got from controllng timing with the megasquirt was the fact that we can (1) datalog our advance, (2) have better mapping based on boost if we need to "turn it up" on the salt (the 6BTM is a bit of a guess when doing this), and (3) best benefit of all was to be able to control timing during cranking. When the engine was warm, it would kick back on the starter when running 36 degrees on the MSD 6BTM setup. Now we are able to run a 10-15 degree advance when cranking, and it doesn't kick back on us at idle.
I'm not really treating this one like a street engine, with lots of advance under decel, etc. So basically I'm running it just like you would suggest. I know better than to disagree with you
and besides, who worries about the deceleration tune on the salt flats??
To the guy who suggested correct rotor phasing. This is great advice that a lot of people miss. We made sure that the rotor was directly underneath the correct spark tower when the engine is at it's peak power timing, or 24 degrees BTDC. That way, at peak spark energy demand, we have the shortest possible gap for the spark to cross between the rotor and the cap/tower. Thanks for the good advice!
Some other interesting stuff we found. Corrosion - BAD - underneath the injector clips. We had one cylinder misfiring on the first pull and as we poked around, we caught the corrosion... cleaned them all up, and she was hitting on all 8 just like always.
This d*mn salt is something else, unbelievable corrosion in such a short amount of time. It makes midwest winter roadsalt seem like Florida.
Thanks guys,
-Scott
I will post up a video soon.