Megasquirt your Ski Nautique Pro Boss GT40 project |
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Peter6000
Newbie Joined: June-04-2017 Location: Northern VA Status: Offline Points: 25 |
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Posted: December-08-2017 at 5:05pm |
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My 1999 Ski Nautique never had stable idle to begin with and being a barfooter I was also looking for a bit more speed. After troubleshooting and some research I decided to get rid of the old Ford EFI.
I settled on a Megasquirt MX3X to do the job. This required quite some research and I figured I share my findings just in case somebody needs to replace an ECU Computer or is interested in engine tuning. My starting point is a Ford 5.8 351W GT40 engine with multi point fuel injection and distributor. It uses a Ford TFI ignition system with computer controlled dwell (CCD) for ignition and batch fire for the 8 fuel injectors (fires 4 injectors at ones) I planned a step by step conversion as follows: 1. Add 2 O2 sensors, without tuning is nearly impossible Done this, Also showed me the reason for the unstable idle way to lean around 15 AFR 2. Assemble and test the MX3X, my background is in electronics so I’m good with a soldering iron. Took about 20h to complete. 3. Build adapter to Ford 60pin to MX3X, done I used a junk yard CPU to get the connector 4.Test MX3X and start tuning, this was somehow easy and took me about 10h to get the engine start, warm up and idle stable. This already fixed the Idle problem by tuning AFR down to 12 at idle. 5. Convert to sequential fuel injection, had to build a new harness for the fuel injectors, install a crank trigger wheel and a cam sensor (in distributor), but the results are incredible. Tuning it with the sequential fuel injection provided even better idle can now go down to 600 rpm no problem. Unfortunately winter got in the way no drive testing possible. 6. Not done jet, convert from distributer to coil on plug, and change from MAP to MAF I have collected a good amount of documentation if you interested let me know I can share it in a Dropbox. |
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6147 |
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A lot of guys would probably be interested in the cost of that adapter for the 02 sensor to tune carb boats.
Sounds like a lot of work and research. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Looks like an ideal part for Duane to machine up!!! |
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Great engineering!
You should sell kits. |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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So, it would be super easy now to bolt a blower on top and still have a civilized engine off-load.. right?
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Jesus was a bare-footer.............
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Peter6000
Newbie Joined: June-04-2017 Location: Northern VA Status: Offline Points: 25 |
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These O2 sensor plates where actual hard to find. I got them off eBay not sure if there are more the 2 available. The guy had them machined and then did not use them. I paid $120 for both.
I also ask a local machine shop to make them it would have been around $500 for 2 but if there is interest in more the 2 the price would drop. I can also contact the the guy selling them to me and see if he can produce a few more if there is interest. The O2 sensors them self are: Innovate Motorsports LC2 Digital Wideband O2 Sensor Controller Kit's The are about $180 a piece but i wanted high quality considering the marine environment. I also got a simple dash gauge to actually reed the AFR. http://www.emnotek.com/p-4689-innovate-motorsports-lc2-digital-wideband-lambda-o2-sensor-controller-kit.aspx?_vsrefdom=adwords&gclid=Cj0KCQiAsK7RBRDzARIsAM2pTZ9vQ2xYLoPUOxsMR_WzKwxYVYgfLCfx03z94X9qKSDMHb6VD2jpb8waAvuTEALw_wcB https://www.diyautotune.com/product/innovate-db-gauge-only-blue-3793/ With the sensor installed I noticed to lean fuel mixture in idle, To prove the point I installed a adjustable fuel pressure regulator and added fuel pressure to. I set AFR to around 12 and my idle was way better. However my top speed dropped due mixture being to rich at high rpm now. and to answer "baitkillere's" question, yes a blower would be possible maybe a project for the next winter season. We have these here in Virginia. Peter |
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Peter6000
Newbie Joined: June-04-2017 Location: Northern VA Status: Offline Points: 25 |
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here a few more pictures
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Call now and receive a second one for free, just pay postage and handling. Operators are standing by |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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Peter6000
Newbie Joined: June-04-2017 Location: Northern VA Status: Offline Points: 25 |
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I contact the guy I got them from and ask for the price of 3 set let see what happens,
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