Friday, December 17, 2010

Megasquirt!

So after many wasted lunch breaks searching the net for info about converting waste spark systems to coil on plug (cop) or coil near plug (cnp) I came back to the Megasquirt web site (do not try megasquirt.com that is a porn site). During my research on their pages trying to determine which version of their ECMs would be best for me I found this page comparing Megasquirt ECMs. I think the MSII Sequencer would suit my needs the best, and it's small and it's pre-assembled (no soldering to screw up). It does sequential injection and runs individual coils like the LS coils I have. I might need a cam sensor, and if so all I would need is a used distributor. I would have to remove the pick up and module then fabricate a sensor mount for a GM cam sensor out of a newer car. So this all means I would have a sequentially injected turbocharged tech IV. If I can come up with the money when they finally release it. This Forum site has entries from people beta testing the Sequencer before final release. And I think I would probably wait a couple of months before purchase to give others time to post any info I might need. The Diyautotune site has the best selection I have found so far, and they are in on the beta testing so they should have a good idea of what should work with what.

Sunday, December 5, 2010

Ignition problems before I start?

After thinking about my ignition plans for a while I started wondering if the coils were actually up to the task. Not their output abilities but their ability to fire as often as I need. In the original setup the LS series coils fire only once per power cycle, only on the power stroke. In a waste spark setup the coils fire on the power stroke and on the exhaust stroke. So if the maximum RPM that the coils could handle on the original setup is 6600 RPM, then in a waste spark setup they would top out at 3300 RPM. So assuming my assumptions are correct the LS coils will either overheat or output will taper off above 3500. Next idea was to use an ignition coil off of a Dodge 5.8 non hemi engine. The older style coil is designed to fire every pulse of a v-8. So at 6600 RPM that coil will fire 26,400 times were the LS coil will only fire 3300. But the output of the dodge coils is noticeably less, possibly less than the original waste spark coils, but they will run cooler than they would in the v-8 and I can run shorter ignition wires to the plugs for less resistance. So maybe I should just keep the original ignition.