Preparing for hot Texas summer...how rich is too rich at idle?
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Road Master
Joined: Dec 2012
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From: CO
Preparing for hot Texas summer...how rich is too rich at idle?
So this will really only make sense to those with a tuner like the PV where you can modify individual cells in the AFR tables.
So modded as indicated in my sig, I've autotuned with PV...but finding that even at relatively low ambient temps(70-80F) it doesn't take very long idling in traffic for the EITMS to kick in, which happens at 289F HEAD temp. So, I've started lowering the AFR in the hot idle range (30kpa/750-1000rpm). No results yet, but I have it set at 14:1 right now and gonna see how that goes. I've heard of lowering idle AFR all the way into the 13:1 range.
Coming from aviation air-cooled engine maintenance, the thinking is that it's only too rich if you start fouling the plugs...**** the EPA when it comes to whether my expensive twin-cam is going to melt down in traffic in 110F ambient texas heat. However, at some point you can start washing the oil off the cylinder walls and diluting your oil with fuel. I'm assuming that's gonna only happen well below 12:1.
Opinions?
So modded as indicated in my sig, I've autotuned with PV...but finding that even at relatively low ambient temps(70-80F) it doesn't take very long idling in traffic for the EITMS to kick in, which happens at 289F HEAD temp. So, I've started lowering the AFR in the hot idle range (30kpa/750-1000rpm). No results yet, but I have it set at 14:1 right now and gonna see how that goes. I've heard of lowering idle AFR all the way into the 13:1 range.
Coming from aviation air-cooled engine maintenance, the thinking is that it's only too rich if you start fouling the plugs...**** the EPA when it comes to whether my expensive twin-cam is going to melt down in traffic in 110F ambient texas heat. However, at some point you can start washing the oil off the cylinder walls and diluting your oil with fuel. I'm assuming that's gonna only happen well below 12:1.
Opinions?
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
FM set up my 20 MAP column at 12.9 AFR(actually .884 Lamda but I did the conversion for ya), so that should be good for you too. Might also think about a cooling fan if you ride in traffic alot. I leave out in the country and rarely have to stop very long.
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Road Master
Joined: Dec 2012
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From: CO
20 map is deceleration only. My 103 idles at 30. In the table there are 20, 25, and 30 columns. I had already enrichened my 20 column to get rid of decel popping.
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
I have tweaked this map a bit, just don't have a pic to post right now. I know I ran the 27 MAP column down to .939 below 4000 rpm. A couple of other small tweaks but nothing big.
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Road Master
Joined: Dec 2012
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From: CO
My table has 20, 27, and 30.... FM set my 27 and 30 MAP columns at stoic to keep me in CL until 4000 rpm then then OL. Just had a thought:
I have tweaked this map a bit, just don't have a pic to post right now. I know I ran the 27 MAP column down to .939 below 4000 rpm. A couple of other small tweaks but nothing big.
I have tweaked this map a bit, just don't have a pic to post right now. I know I ran the 27 MAP column down to .939 below 4000 rpm. A couple of other small tweaks but nothing big.
Last edited by Red Dragons; Mar 19, 2013 at 11:01 PM.
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Road Master
Joined: Dec 2012
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From: CO
Sweet, thanks. That thread is too damn big.
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Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
I'd not worry about the MAP numbers, just think about the RPMs. The MAP will vary depending on your altitude and it won't matter much as you will not run the bike at real low RPMs and high MAPs anyway.
I set all the columns in the 1000 and 1125 rows of the AFR table to 13.8. I could feel the immediate drop in heat off the engine around town with that change.
Not sure how rich you can practically take it but I suppose 13.5 would still be OK. You don't need to worry much about mpg at those RPMs, its only sipping then.
I set all the columns in the 1000 and 1125 rows of the AFR table to 13.8. I could feel the immediate drop in heat off the engine around town with that change.
Not sure how rich you can practically take it but I suppose 13.5 would still be OK. You don't need to worry much about mpg at those RPMs, its only sipping then.
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Thread Starter
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Road Master
Joined: Dec 2012
Posts: 848
Likes: 30
From: CO
I'd not worry about the MAP numbers, just think about the RPMs. The MAP will vary depending on your altitude and it won't matter much as you will not run the bike at real low RPMs and high MAPs anyway.
I set all the columns in the 1000 and 1125 rows of the AFR table to 13.8. I could feel the immediate drop in heat off the engine around town with that change.
Not sure how rich you can practically take it but I suppose 13.5 would still be OK. You don't need to worry much about mpg at those RPMs, its only sipping then.
I set all the columns in the 1000 and 1125 rows of the AFR table to 13.8. I could feel the immediate drop in heat off the engine around town with that change.
Not sure how rich you can practically take it but I suppose 13.5 would still be OK. You don't need to worry much about mpg at those RPMs, its only sipping then.
Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
I put a bit more info in an article for our club site that might be of some vague interest...
http://www.harley-davidson-hangout.c...ighs-efis.html
http://www.harley-davidson-hangout.c...ighs-efis.html