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Author Topic: Proper A/F ratio ??????  (Read 4034 times)

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BUBBLEHEAD

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Proper A/F ratio ??????
« on: September 21, 2007, 10:41:51 AM »

Just patiently (yeah right) waiting on my SERK. Have the SERT at the stealer waiting also. Talked with the tuner he says that after the High flow, pipe, and SERT he will turn off the closed loop mode with the SERT and set the A/F ratio at 13.8 max. Sound good ? He says that is what H.D. recommends for these engines. What do you'll think cause I B LOST on this one. Thanks
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miker

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Re: Proper A/F ratio ??????
« Reply #1 on: September 21, 2007, 10:52:49 AM »

Just patiently (yeah right) waiting on my SERK. Have the SERT at the stealer waiting also. Talked with the tuner he says that after the High flow, pipe, and SERT he will turn off the closed loop mode with the SERT and set the A/F ratio at 13.8 max. Sound good ? He says that is what H.D. recommends for these engines. What do you'll think cause I B LOST on this one. Thanks

Well, if it is tuned like mine, you will loose some heat...I have not pulled a plug in around 500 miles to check , maybe this weekend.
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rednectum

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Re: Proper A/F ratio ??????
« Reply #2 on: September 21, 2007, 12:27:47 PM »

Just patiently (yeah right) waiting on my SERK. Have the SERT at the stealer waiting also. Talked with the tuner he says that after the High flow, pipe, and SERT he will turn off the closed loop mode with the SERT and set the A/F ratio at 13.8 max. Sound good ? He says that is what H.D. recommends for these engines. What do you'll think cause I B LOST on this one. Thanks

he said hd recommends--------------violating epa?  not doubting his skills, just wondering why he would go with hd and not perform complete dyno tune? you never know what you will wind up with till tune is finished. most tuners that flatline a tune go with 13.2.

why would hd recommend 13.8?

just curious.
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BUBBLEHEAD

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Re: Proper A/F ratio ??????
« Reply #3 on: September 21, 2007, 01:52:11 PM »

Not sure were the 13.8 ratio comes from. :nixweiss: Would like to see it in writing from the MOCO. He is doing a full dyno tune just making sure that the max a/f is not higher than 13.8. It sounds like MOCO is fully aware of the a/f/r problem but the EPA is up there arse. I don't know anything about making a motor run (it's that big thing between the frame rail thingies right??) If anyone has experience in this area does all this sound right??? At $300 a pop would like to get tuned correctly the first time.

FYI same tech tuned my 2007 FLHX it ran great and got good #'s. Just think it's more critical on the 110 :confused5: :confused5: :confused5:
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Midnight Rider

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Re: Proper A/F ratio ??????
« Reply #4 on: September 21, 2007, 02:10:51 PM »

Not sure were the 13.8 ratio comes from. :nixweiss: Would like to see it in writing from the MOCO. He is doing a full dyno tune just making sure that the max a/f is not higher than 13.8. It sounds like MOCO is fully aware of the a/f/r problem but the EPA is up there arse. I don't know anything about making a motor run (it's that big thing between the frame rail thingies right??) If anyone has experience in this area does all this sound right??? At $300 a pop would like to get tuned correctly the first time.

FYI same tech tuned my 2007 FLHX it ran great and got good #'s. Just think it's more critical on the 110 :confused5: :confused5: :confused5:

I would be very surprised to hear that the MOCO "endorses" this, though unofficially they might be whispering this in the dealer's ear.  As others have said, generally a "target" A/F is 13.2 - 13.4.  At cruising throttle positions, 13.8 would not be bad at all....a hell of a lot better than the 14.7 it's currently set up for.

Where in GA are you?
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Hoist!

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Re: Proper A/F ratio ??????
« Reply #5 on: September 21, 2007, 02:15:46 PM »

The only thing MoCo will endorse is street legal mods. Period! There are no street legal mods that will allow you to retune your engine on a 110" Period! If they're trying to convince you otherwise, get your bike outta there ASAP and bring it to a place where they'll work with you to get what you need. You need a SERT, PC, or other tuning device, then have it Dyno Tuned for optimum perfomance. Anything else, including self tuning ECM's, without custom tuning, is like pissing into the wind! ;)

Hoist! 8)
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BUBBLEHEAD

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Re: Proper A/F ratio ??????
« Reply #6 on: September 21, 2007, 02:22:52 PM »

LIve in Cumming Ga. work in Atlanta. The Tech says he can set the a/f ratio to whatever he wants, would telling him to keep it under 13.5/1 be the smart thing to do. He says he sets max a/f/r then does a full dyno tune around that setting. At least that's what I understood him to say.
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GMR-PERFORMANCE

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Re: Proper A/F ratio ??????
« Reply #7 on: September 21, 2007, 02:25:52 PM »

Most custom tunes will idle around 13.2 -13.5 and have a cruise range Afr of 13.5- 13.8 and wot may be in the 12.8 range. The engine will let you know what it wants or does not want. Weight of the bike and riders, fuel quality, elevation all effects what Afr works best. As well timing comes into play as well.  I have done tunes where you have very little fuel at one location and huge the next, the cam , pipe, may really start to work and you have to add some fuel into the map to keep a nice curve going.
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BUBBLEHEAD

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Re: Proper A/F ratio ??????
« Reply #8 on: September 21, 2007, 02:36:55 PM »

Thanks GMR looks like Miker has just what you are describing. I'll pull my sheet from the street glide and compare to just double-check my tuner. Not looking for a rocket like Hoist, just want a really strong fun ride. If it doesn't blow-up I should be happy.
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miker

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Re: Proper A/F ratio ??????
« Reply #9 on: September 21, 2007, 02:50:23 PM »

I am sure more could be squeezed out but I was onto the heat issue last September,, so I instructed the tuner to do the best he could and maintain a slightly flat rich line, plugs are cheap.  The bike runs well, oil temp has remained around 240 even in the Soflo heat and traffic with metal temps around 380.  I measured my honies tc88 and metal temp was similar so...we'll see how this early 110 does.  The sequnece # on this bike 0056 if that measn anything.

Miker
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Midnight Rider

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Re: Proper A/F ratio ??????
« Reply #10 on: September 21, 2007, 02:53:15 PM »

Thanks GMR looks like Miker has just what you are describing. I'll pull my sheet from the street glide and compare to just double-check my tuner. Not looking for a rocket like Hoist, just want a really strong fun ride. If it doesn't blow-up I should be happy.

If you want to take a little ride, there is an excellent tuner in Central Southeastern Alabama.  It would be a 3-4 hour ride for you to get there.  But, your bike would be dead-on right...
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BUBBLEHEAD

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Re: Proper A/F ratio ??????
« Reply #11 on: September 21, 2007, 02:59:36 PM »

miker sounds like we're of the same thought. later when $$$ permit I'll swing over to more of what Hoist is doing.

TCnBham please send me the info. I'll surely be doing cams early next summer a ride west would probebly do me good. :pepper:
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Talon

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Re: Proper A/F ratio ??????
« Reply #12 on: September 21, 2007, 03:17:50 PM »

Take a look at the page below, it describes what everyone has been saying. One ATF ratio across the board might get you by, but won't get you your best performance, or gas mileage.

http://www.nightrider.com/biketech/Pro_tuning.htm
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rednectum

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Re: Proper A/F ratio ??????
« Reply #13 on: September 22, 2007, 05:57:33 AM »




hey steve, is this what you were talking about. started the roll on at 2000 rpm. probe is a little lazy there as you can see.
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rednectum

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Re: Proper A/F ratio ??????
« Reply #14 on: September 22, 2007, 05:58:45 AM »

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