Has anyone used a Megasquirt fuel injection setup? I am thinking about doing this for my senior project on my 84 Blazer 305. How are they for reliability? Are they somewhat 'easy' to tune? I have been looking at megasquirt info all this evening, and I think it would be neat to install on the blazer.

Brendan

 

I've used megasquirt on a couple of vehicles (I'm a week or two away from finishing up ms'n's-e intstall on my 350. Going to use the 8-pin hei dizzy, Lt1 intake and MS-I running the extra firmware.

Tuning is really not too bad, especially now that there are a couple of tools that make it easy with a WB02. VexME which will adjust your tuning table to match a target AFR table, and also the MegaTune program has "auto-tune" built into it now so you can drive around and the MS will tune itself to your desired AFR table. No experience with the "auto-tune" yet, but VexME has proved pretty good IME.

If you have a NB 02 sensor, it's a little tougher road, but still perfectly manageable.

This will be my first install where spark is going to come into play, so I'm a bit worries about timing maps, and don't have any advice to offer, but there are a few stock maps floating around (both fuel and spark). You may not know this but the MS was originally designed to control a TPI 350, so the stock fuel mapping at least should be enough to get you rolling pretty well right outta the box.
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Reliability wise, I think people have had really good luck. I don't think there are any 100K mile MS installs, but certainly a good many in the 5 digits mileage wise without any problems. How well its mounted and where its mounted are going to be the bigest factors IMO. The MS-I isn't waterproof, and isn't capable of dealing with underhood temps (the MS-II has--or is about to get--some higher temp componentry), and all electronic components are sensitive to vibration. That being said, there are some off-road race vehicles using the MS with good results.

If you haven't visited the msefi.com forums, I'd suggest you check it out, lots of helpful, experienced people there.

 

I run a Megasquirt-II. I got mine running last year and drove my car around most of the summer. All the problems I had with the conversion were stuff outside the megasquirt, namely my wiring. My MS has never done anything real flakey. There are some who use them on daily drivers.

Tuning isn't bad at all. VexMe is one tool, the new Auto-tune (which I haven't tried yet), and the old standby of MSTweak, which is what I used for the low-load stuff. I tuned my full throttle stuff manually. It took about 15-20 minutes with a friend driving and me tuning.

If you decide you want to do it, read the MegaManual. Tons of useful info in there. The problem is, you won't realize (at first) how useful some of it is, until you have a running engine.

-Dave