flyrotary@lancaironline.net Mailing List Archive

I'm very interested too. I'm planning on putting a mega squirt 3 in my car and probably airplane someday... On May 16, 2012, at 11:56 AM, Mark Steitle <msteitle@gmail.com> wrote: > Ernest, > > Great diagnostics there. Let us know how the MegaSquirt works out. > > Mark > > On 5/16/12, Ernest Christley <echristley@att.net> wrote: >> I cleaned the plugs, but they just kept getting flooded, and despite the >> modifications I made to the intake manifold, I >> was still getting fuel pooled in there. >> >> I moved on to checking the spark. The timing light was only flashing >> occasionally, and I noticed that my VR sensor was >> mounted so that it was almost in front of the toothed wheel. I have some >> new tools I didn't have when I originally cast >> the mount, so I cleaned it up, and trued it. Timing light was still >> sporadic. Plugged the wire into a scrap spark plug >> and sat it on the engine while I cranked. Nice, consistent blue-white >> spark. May have been there all along, but at >> least my VR sensor mount looks nicer. >> >> I've got new fuel, good compression, and good spark. Deep breath, back up, >> and compare what I have now to what I had >> when it was running back in November. I consult TunerStudio (the user >> interface I'm using to my engine controller). >> The only thing significantly different is that I converted from using >> Speed-Density to Alpha-N. >> >> Background: MegaSquirt has several, user-configurable ways to determine how >> long to have the fuel injectors spray. One >> way is to measure the manifold pressure and combine that with the RPM. >> Another is to look at where the throttle is and >> combine that with RPM. Both are just secondary measurements of how much air >> the engine is swallowing, and have a whole >> slew of corrections and modifications for various conditions. Tuning >> involves filling numbers into a table. Across the >> bottom is the RPM. Up the side is either the throttle position, or the >> manifold pressure. For each cell you specify a >> volumetric efficiency as a percentage. You've already specified how long >> the injectors would spray for a 100% VE cycle, >> so the cells essentially become a percentage of that value. By switching >> modes, my table no longer resembled reality. >> Instead of picking up the value of 43 from the table while cranking, it was >> picking up a different cell that had 93. >> More than double the required fuel. >> >> I switched the setting back, and gave it a try this morning. It took about >> 30 seconds of spinning while it was >> obviously trying to kick off before it caught up and ran smooth at 1500 RPM. >> It has taken two weeks since I got >> everything painted and tried start taxi testing, but I'm now back in the >> game. >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html >> > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html