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Keeping your Protec EFI with a DUI system

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tryathlete View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tryathlete Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 2:52pm
I used to work for an electronics supplier and we provided total support for anything we ever made as a matter of good faith. Low volume companies like PCM should be totally responsive for their legacy product, particularly since the Pro Boss system is failing and they don’t have the means to supply out of production components.

Perhaps where there’s a will there’s a way is all we have to go on!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MechGaT Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 2:55pm
Way to go getting it running.

To post a picture, hit the post reply button and a new window pops up. Use the button at the tops of the page with a tree and an arrow. Navigate to your picture on your computer and select it. It will upload to the site and insert a link. You can use the Preview button to see what it will look like.

Before you upload you might need to lower the resolution so it is under the file size limit.

From a smartphone or tablet, you have to use a photo sharing site and I haven’t messed with those.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 3:01pm
Before the party starts............make sure it runs under load on the water.

Then the celebration can begin   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote desertskier Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 3:37pm
Originally posted by Mikewolf Mikewolf wrote:

I tried 10k and 5k and also 8.2 and 4.7 ohm

With the 10k and 5k, there was no signal getting to the ecu. With the 8.2 and 4.7 ohm, the ecu was getting signal, but the distributor was being grounded out.


It sounds like the tach wire has a limit as to how much current it can source (this could vary under load) and the EFI module has a minimum current requirement. Depending on what those numbers are you may not have much margin. Given what you have found out the ideal situation would be to use the tach wire to drive a circuit that connects to the EFI module (just like the Protec unit did) so they are isolated from each other and wouldn't limit current.   You may have been able to use the old Protec unit to supply the signal. Just connect power/ground/tach wire and the EFI module wire.

Hopefully it runs well as is.   Good job to all!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 3:46pm
Congratulations on proving it could be done. It's sad that the "parent" company could care less about supporting their Protec system. Now if they could only figure out how to stop prop shafts from breaking!!


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikewolf Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 4:07pm
I just tested it out. Ran an indicated 48 mph. With the failing protec ignition I couldn’t get it above 35 mph. Thanks everyone for all the help and info posted. Need to go out for a ski now.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 4:27pm
Originally posted by Mikewolf Mikewolf wrote:

I just tested it out. Ran an indicated 48 mph. With the failing protec ignition I couldn’t get it above 35 mph. Thanks everyone for all the help and info posted. Need to go out for a ski now.


Well, let's get this party started

Good job
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 2001Sunsport Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 4:47pm
Originally posted by Mikewolf Mikewolf wrote:

I just tested it out. Ran an indicated 48 mph. With the failing protec ignition I couldn’t get it above 35 mph. Thanks everyone for all the help and info posted. Need to go out for a ski now.


Sweet!! Big thanks to @Dreaming and @malcolm2 for providing old Pro-Tec parts for me to bench test. Really excited we were able to figure this out!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fanofccfan Quote  Post ReplyReply Direct Link To This Post Posted: July-12-2018 at 6:23pm
The magical powers of the inter web net thingy never cease to amaze me. This thread was so far above me and my skills but sure was a great follow. Good work and happy skiing.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: July-15-2018 at 6:33am
So................does this thread ever get a good finish like a writeup,of just what was done, and a diagram for somebody to follow if they're trying to do the same thing?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: July-26-2018 at 9:37pm
Originally posted by KENO KENO wrote:

So................does this thread ever get a good finish like a writeup,of just what was done, and a diagram for somebody to follow if they're trying to do the same thing?


So will the good finish ever happen so that the next guy that wants to do this has something useful to work with?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikewolf Quote  Post ReplyReply Direct Link To This Post Posted: August-08-2018 at 10:01pm
I will happily send someone a picture of my wiring diagram to post, but I don’t have a computer to post it myself.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote desertskier Quote  Post ReplyReply Direct Link To This Post Posted: August-10-2018 at 11:04am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikewolf Quote  Post ReplyReply Direct Link To This Post Posted: August-13-2018 at 8:38pm
I emailed you my wiring diagram. It’s the green/ purple wire on the ecu you connect to.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote desertskier Quote  Post ReplyReply Direct Link To This Post Posted: August-14-2018 at 3:38pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: August-14-2018 at 3:49pm
Originally posted by KENO KENO wrote:

Originally posted by KENO KENO wrote:

So................does this thread ever get a good finish like a writeup,of just what was done, and a diagram for somebody to follow if they're trying to do the same thing?


So will the good finish ever happen so that the next guy that wants to do this has something useful to work with?


Thanks, now we have the good finish

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Post Options Post Options   Thanks (0) Thanks(0)   Quote SNobsessed Quote  Post ReplyReply Direct Link To This Post Posted: August-14-2018 at 6:00pm
Glad it is working.

I am wondering if there is any shift in FI timing, using the DUI pulse as opposed to the OEM signal.

If there is, apparently it doesn't affect performance.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikewolf Quote  Post ReplyReply Direct Link To This Post Posted: August-15-2018 at 8:51am
With a throttle body injection, the timing of the fuel injectors is based on the amount of air coming in and not based on the ignition.

The Dui unit has a mechanical advance for ignition timing. So everything is good.


Also as an update, I’ve put 30 hours (probably 25 of them pulling skier, boarders, and tubes) on the boat since I put in the Dui unit and it’s still working well. I appreciate the help from everyone here.
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