Alright, an update... I've had the car running again for about a week and man, what an improvement in horsepower so far. Haven't had it back to the dyno yet but my butt dyno approves so far.
I ended up plotting the retard curve to 7* advanced at idle (20" vacuum) and a pretty linear curve starting at 1000 RPM at 7* ending at 32* advance at 3000 RPM. I believe it would actually like a little more timing on the top end and a little less timing at idle but the box is limited to 25* of retard so this is the happy medium so far. It runs great, starts great, idles great, and I haven't heard even a hint of detonation anywhere and I've tried to get it to ping.
Quote:
Originally Posted by 68Cuda
You can add a MAP sensor input to the box and tweak advance vs. engine vacuum. It actually works backwards... you add advance, then pull it out based on a vacuum vs. retard curve. This will allow you to run more advance under low load...
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Okay, I have a 1 bar MAP sensor hooked up to the box and manifold vacuum...but no boost retard curve plotted yet. This is where I need a little bit of laymans help once again helping me understand vacuum advance and how to use it to better the performance from my car.
I finally have
almost gotten used to thinking about timing advance in reverse with this box...but vacuum advance, boost retard is still real foggy to me...not to mention how to set it up to work best in my situation.
Here is my graph at idle as it sits now.
and like I said it's pulling 20" of vacuum at idle
When I had the initial at 10* it was idling at 1100 RPM and pulling 23" of vacuum.
Can anyone help me with a easy to get tutorial on how to set up a boost retard curve that will help this engine using the MAP sensor?
Or just tell me what I need the MAP sensor to tell the box what to do...where and when do I want it to add advance and where and when do I not want it to add advance?
If someone can help get that through my thick head, I believe I can figure the rest out. I have to say, it was pretty effing cool to grab a dot on the graph, drag a line, and hear the engine change when responding to the change I made. I really dug that. I believe I could do the same with the boost retard curve, I just need to understand exactly what I'm trying to do first.
Thanks...