Finally had a clear day to finish the install of my megasquirt fuel injection system on my jeep.
For those not familiar with Megasquirt, check out the websites:
and Yahoo group for messages:
The weather here in Winnipeg is cold now, and I am really impressed with the way this system is running. It started as soon as the system got fuel, and ran perfectly right off the bat, using the fuel curve (actually VE table) for a 350 chevy scaled down to a 258 and set for the GM tbi unit I am using that I got off a 305 chevy.
Instant starts and very crisp throttle response. Roads are bad right now and all testing had to be done in 4wd. I used a stock 258 intake manifold that I ground out the plenum just about to 1/8 inch of the edges to mate up with the Gm tbi and not have any "funnel" to the adapter. I mad e the adapter from 2 1/4" thick aluminum.
The incredibly crisp throttle response makes me feel like horsepower has increased. I'll have to wait till the roads are better to get more insight into that. Best test will be cruising down the highway for power.
The system cost me $110.00 for the ECU kit, I think around $50.00 for the relay and power distribution kit, $35.00 for the "stimulator" (to test the unit), $20.00 for the tbi at a junkyard, including all sensors and wiring harness (and a rear view mirror), $150.00 for the fuel pump, $14.00 for a piece of aluminum to make the adapter and at least $100.00 for hose, wire, heat shrink tubing, etc. So I'm in to this for around $500.00.
The software to tune the ecu is free, and this project is the brainchild of Bruce Bowling and Allan Grippo who developed the Megasquirt system that is cheap to build, fully tunable, and adapts to multiport or TBI.
More megasquirt kits should be available in the new year, but several months from now. They made up about 500 or so kits and they were done as a group buy. This is megasquirt's second version and biggest distribution yet. Guys are megasquirting everything from kit cars, pinzgauers, racecars to boats.
The kit uses an 02 sensor, if desired, and I will start tuning soon to get the best mixture and fuel economy. I'm just amazed how well it's running without any tuning at all. I simply used the VE table for a 350 chevy, lowered the upper rpm limit slightly, and set the fuel volume for a 258 engine using 2 40 lb/hr injectors squirting in an alternating fashion.
My only beef with the project is the noisey Carter fuel pump. Emits a real howl from beneath the jeep. Maybe I should have avoided the BBD manufacturing company that got me started into all this tinkering to begin with!
Anyhow, this is a good alternative for those who want to build as much of the system as possible, and who would like to be able to tune all aspects of the fuel injection system.
Best wishes and a Happy New Year to you all.