head volume
Road Master
Joined: Feb 2014
Posts: 913
Likes: 5
From: indiana
here's a way to maybe help some of you guys to understand it.
at high vacuum which means no load part throttle the switch is on and WOT low vacuum the switch is off.
ok now when your setting your timing you ground the voes wire which would be switch on set the rpm to above 1500 rpm which means the max advance of 35 degrees is present at just off idle.
and when the voes wire is ungrounded it goes back to its normal curve which maxed out at 35 degrees at around 3500 rpm
do you see now it doesn't retard the timing to save the motor. it advances it to gain fuel mileage and make the epa happy.
so if you don't run a voes you will never have to worry about the timing being to far advanced
at high vacuum which means no load part throttle the switch is on and WOT low vacuum the switch is off.
ok now when your setting your timing you ground the voes wire which would be switch on set the rpm to above 1500 rpm which means the max advance of 35 degrees is present at just off idle.
and when the voes wire is ungrounded it goes back to its normal curve which maxed out at 35 degrees at around 3500 rpm
do you see now it doesn't retard the timing to save the motor. it advances it to gain fuel mileage and make the epa happy.
so if you don't run a voes you will never have to worry about the timing being to far advanced
Ultimate HDF Member
Joined: May 2006
Posts: 6,590
Likes: 444
From: Ohio
Good a time as any since we are talking about tuning.........
'97.... at times you refer to using something called a WEGO to tune your bike using AFRs. I think you also said you used the ports in your headers. Can you explain?
'97.... at times you refer to using something called a WEGO to tune your bike using AFRs. I think you also said you used the ports in your headers. Can you explain?
Road Master
Joined: Feb 2014
Posts: 913
Likes: 5
From: indiana
if you don't have one you need it
its a wide band AFR meter I have one on my bike I can see my AFR in real time while im riding
here is the one I have
http://www.daytona-sensors.com/wego3.html
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,199
Likes: 3,087
From: NW AR
I look at vacuum advance and the VOES system like D_gyver: It's not vacuum advance, it's lack of vacuum retard. Same as on a stock HD: It's no (or low) vacuum retard so that you can have a higher advance at partial throttle conditions. Higher advance is better for fuel economy, power, etc., but bad for blowing a hole in the top of your piston.
I've tuned a few motors: 4AGE 20 valve, 22R, 883 Sportster. Fuel only on the 883, fuel and spark on the other 2. No dyno time, but data logging and fiddling while driving (Seat of the Pants Dyno.) After you fiddle with fuel, you fiddle with spark, then fiddle with fuel, etc. Eventually, I get to a point where I'm changing things back to how they were and I leave it. I need to tune the Sporty a bit more. Runs great, but I think I can lean it out at cruise and get a little better MPG out of it. I use narrow band oxygen sensors because wide bands cost at least 2 bills. The Sporty doesn't have enough amps to run a wide band anyway. I use an unheated narrow band for that one.
I've tuned a few motors: 4AGE 20 valve, 22R, 883 Sportster. Fuel only on the 883, fuel and spark on the other 2. No dyno time, but data logging and fiddling while driving (Seat of the Pants Dyno.) After you fiddle with fuel, you fiddle with spark, then fiddle with fuel, etc. Eventually, I get to a point where I'm changing things back to how they were and I leave it. I need to tune the Sporty a bit more. Runs great, but I think I can lean it out at cruise and get a little better MPG out of it. I use narrow band oxygen sensors because wide bands cost at least 2 bills. The Sporty doesn't have enough amps to run a wide band anyway. I use an unheated narrow band for that one.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,095
Likes: 7,622
From: Poolville
I've seen them
Real time AFR monitoring is nice, I hear they work well. D, do you have a Dynatek ignition programming kit? If so I see that it has a VGA connector, can you use a vga to usb connector to a laptop and will it still work? I'm thinking of getting one to customize the preloaded curves from Dynatek...
Thread Starter
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Tourer
Joined: Jan 2008
Posts: 359
Likes: 21
From: Midland Tx.
Wow, didn't realize there were so many MIT nerds riding Harleys. All this tuning and timing and AFR's and lambda crap is way too involved for me. I just want to ride my motorcycle, not tinker and tweak and study and map and analyze the AFR at every RPM.
This crap may be fun for you all but for me it's sucking the fun out of the whole subject.
With so many **s h**es here... clearly I'm in the right place.
So let me show you what the inside of my cylinder looks like, I'm not sure, but to me it looks like there aren't too many miles on this since it was redone.
This crap may be fun for you all but for me it's sucking the fun out of the whole subject.
With so many **s h**es here... clearly I'm in the right place.
So let me show you what the inside of my cylinder looks like, I'm not sure, but to me it looks like there aren't too many miles on this since it was redone.
Thread Starter
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Tourer
Joined: Jan 2008
Posts: 359
Likes: 21
From: Midland Tx.
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Seasoned HDF Member
Joined: Aug 2007
Posts: 8,199
Likes: 3,087
From: NW AR
Real time AFR monitoring is nice, I hear they work well. D, do you have a Dynatek ignition programming kit? If so I see that it has a VGA connector, can you use a vga to usb connector to a laptop and will it still work? I'm thinking of getting one to customize the preloaded curves from Dynatek...