Thread: Aftermarket Injection Systems - 4.6

google rusefi :-)
i'm gonna go that way. though, lots of stuff to do...

Sent from my JY-G4 using AULRO mobile app

I used the Megasquirt (MS2 Extra) for my 4.6 and it has been great for the past 50,000Ks. Was a bit overwhelming at first but really only a large bunch of wires to install. Bought the ECU prebuilt and all the associated sensors, injector plugs, toothed wheel, relays, EDIS module from the UK (pobably about $500 all up). I used MSD coil packs to get rid of the Rover distributor, used a cut down distributor to run the oil pump, also got rid of the stepper motor. I installed a wideband O2 sensor to help with tuning. Now just plug in the laptop and you can adjust any parameter you want to fiddle with. Result: stable idle, good power, consumption around 15L/100K on the highway. The only problem I had initially was ocassional resets where the car would just hesitate for a split second when accelerating but this was solved by using resistor spark plugs. Lots of support for Megasquirt on LR4X4 site.
Nick

One problem I see here. Unless you have a complete system alrealy tuned to a 4.6 engine, how are you going to run in the cam etc if it takes you hours to get it running properly? Is there any physical reason you're going distributorless up front? Running a late D1/RRC front cover means you get a serpentine belt, a dissy for running in, and can use a 14CUX to do the initial fuelling. Having put a 4.6 under a late 3.9 ECU it runs just fine for most purposes. Then you can plug the dissy hole without losing oil pump drive (as it's already crank driven) and stuff around with aftermarket at your leisure. Any problems and you can revert to simple equipment at any time to keep the truck on the road.

I do had pondered the issue of running in the cam - if all else fails I will just move the 3.5 manifold and carbies as they are across to the 4.6 to do this work.

However with Megasquirt you can get load generic maps onto the system that will make the engine run OK and later you can play around with it to maximise performance.

I am interested in your thoughts on putting a 14CUX on the 4.6 because I have one without airflow meter and ECU sitting on a 3.9 in the garage - I understand it will run the 4.6 with an upgraded ECU but not quite as good as Gems or Thor but a lot simpler.

As far as going distributorless - well that is a decision I made early on as the source engine was a Thor 4.0 but I do sometimes regret that as it reduces flexibility - but I now have an after market 4.6 non dissy cam so an stuck with that decision until I through away the current cams cost and get a new one. If I were to go carbies or 14Cux I would just Mega jolt the ignition.

Cheers

Garry

Contact Hilborn through their web-site. They don't just make their famous constant flow race car systems but do all sorts of electronic and mechanical systems for street use including custom builds. Being of Buick origin they may already have systems available.

I use to run a Mark Adams 14CUX on my 4.6 with a Jag air mass and it ran extremely well.

I take that is just the ECU - i am looking at complete systems.

Thanks

Garry

Sorry mate, I thought you wanted to know how a 14CUX went on a 4.6;

"I am interested in your thoughts on putting a 14CUX on the 4.6 because I have one without airflow meter and ECU sitting on a 3.9 in the garage - I understand it will run the 4.6 with an upgraded ECU but not quite as good as Gems or Thor but a lot simpler".