2-bar trick vs 1-bar

[Helimech]

Ok, Chris has said that the j-bodies use Alpha-n (TPS,rmp)for their fuel delivery and not the MAP, however MAP is used for ignition. For a Turbo application the 2-BAR trick would seem nessesary to control the timing retard needed at higher boost levels.
Okay, now the curveball, I have a DIS-2 ignition that can retard based on RPM so based on this information would there be any real gains to using a 2-bar and re-scaling?

Thanks
Andrew

[Shifted]

Well, unless you have the programmable one, then I would still say yes. The biggest problem is where you'd scale the table back into the lower kpa area's, there is much lower resolution there. The biggest thing with having so many places (a table) to put timing in, your car may need timing at 75kpa at 5500RPM, but less timing at 75kpa at 5000 RPM. With the non-programmable MSD it retards timing a fixed amount across the entire rpm/kpa range.

[Chris@HPTuners]

Ok, Chris has said that the j-bodies use Alpha-n (TPS,rmp)for their fuel delivery and not the MAP, however MAP is used for ignition. For a Turbo application the 2-BAR trick would seem nessesary to control the timing retard needed at higher boost levels.
Okay, now the curveball, I have a DIS-2 ignition that can retard based on RPM so based on this information would there be any real gains to using a 2-bar and re-scaling?

Thanks
Andrew

The only issue for timing is if you wanted to run different timing for part boost than full boost if you just tune your timing for the highest boost then it would work fine.