Boat "data logging"

Boatally Insane · Sep 14, 2008

I recently picked up an Innovate LM-2 for my boat to read the A/F mixture and do some general data logging...

Currently I have a wide band 02 sensor, an RPM source, a throttle position sensor, and a map sensor.....

I'm still working on adding trim position and speed to the system but haven't gotten those sensors figured out quite yet...

I haven't found a way to share the logs other than video taping the "virtual dash" on a computer replay of the runs....

This is my first attempt so please excuse the somewhat out of focus/shaky camera shots... I hope to find a better way to do it soon.....

Here is my first log at idle....

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This next log is of mostly the "primary" carb circuit. My secondaries start to open at about 40% tps position.

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This is towards the end of a WOT run.... 83 mph with a STOCK Bravo 28

.

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This last one is just some general runnin' around.......

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Doug

Super24 · Sep 14, 2008

Cool! What kind of ECU / ignition are you running? I use Diacom Marine software.

Boatally Insane · Sep 14, 2008

Super24 said:
Cool! What kind of ECU / ignition are you running? I use Diacom Marine software.

I don't have an ECU... It's a carburated engine..

I'm running a magnetic pickup distributer, similar to the 502 mag efi system, but have bypassed the module and ran the wires from the magnetic pickup directly in to a Crane HI-6M box...

Doug

cubicinches · Sep 14, 2008

That second one gets a little lean between 2700-3000. Pretty typical just before the transition. Otherwise, looks great... nice clean idle, good and fat at WOT. What carb?

cubicinches · Sep 14, 2008

Also, that's awesome with the map on there. Never done it like that. Great tool, isn't it?

Boatally Insane · Sep 14, 2008

The carb is a Holley 950 HP

I had dropped the primary jets from 78's to 74's since it was blowing black smoke with the A/F ratio running in the 9's and 10's at 3000 rpm on the hose... :confused1

Once I got it in the water under a load I found it was actually lean....

Doug

cubicinches · Sep 14, 2008

You've got the 950 HP, it should have dominator style air bleeds. Try going two or three sizes smaller on the high speed... that should help the transition tremendously.

Boatally Insane · Sep 16, 2008

cubicinches said:
You've got the 950 HP, it should have dominator style air bleeds. Try going two or three sizes smaller on the high speed... that should help the transition tremendously.

I went to the Holley website to see if I could find some specs. as far as what air bleeds are in my carb and ran across this........

AIR BLEEDS:
WARNING! Adjustment of the air bleeds is not recommended. A competent mechanic with a complete and thorough knowledge of carburetors, fuel systems, and engine requirements should only perform air bleed adjustments.
Failure to follow these recommendations may result in a lean fuel/air mixture causing severe engine damage, property damage, serious injury, and/or death.

I"ve heard of covering your A$$ but that's a bit ridiculous.. :laugher: :laugher:

Doug

cubicinches · Sep 16, 2008

http://www.holley.com/data/TechService/Technical/Air Bleed Specifications.pdf

That's the link to the air bleed spec chart on their website.

Check by your list #, it'll be on the side of the carb since the HP series has no choke horn. It's not uncommon to have to tighten up the high speed bleeds in a marine application, as it helps the lean spot during transition. Going smaller will richen it up slightly in the middle, but more importantly it will cause the secondary boosters to start moving fuel earlier. You've probably got about a 32 in the high speed now. I wouldn't hesitate to go to a 28 and see how it behaves, it'll only richen it up.

Don't ya love the disclaimer? I don't think an air bleed change will really cause death... :laugher: I guess it's probably not a good idea to mess with air bleeds if you know nothing at all, as it does change the metering characteristics (and, that's what you need). But, with the wideband on there, you can constantly monitor what's going on. I'm sure the change will help. You may still have to do some jetting as well, but I'd start with the bleeds, and only change one thing at a time.

Boat "data logging"

Boatally Insane

Super24

Boatally Insane

cubicinches

cubicinches

Boatally Insane

cubicinches

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