WEGO 3 installation
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,092
Likes: 7,615
From: Poolville
Couple of question.....
What is the head pipe diameter of the Fatcat pipes.? If they are 2" head pipes that might be part of the problem with tuning.....
Do you have an O2 bung on the front cylinder? If so put the sensor there to monitor the front cylinder. By what I've heard you get the most consistent readings by using the front cylinder......
What is the head pipe diameter of the Fatcat pipes.? If they are 2" head pipes that might be part of the problem with tuning.....
Do you have an O2 bung on the front cylinder? If so put the sensor there to monitor the front cylinder. By what I've heard you get the most consistent readings by using the front cylinder......
Road Captain
Joined: Aug 2012
Posts: 625
Likes: 102
From: New Albany, Ms.
Hang in there, I got your runs to cross into my older software with time scale, showing a copy of a spreaded out run you posted, will work on getting your last run into that format.
You can also tune it by watching the Wego digital screen live, that is how I tune them.
You can also tune it by watching the Wego digital screen live, that is how I tune them.
With the old version, You can set it as as low as a 15 second segment of the graph.
The newer only lets you go to 45 seconds a segment.
Big difference. Wish it was still like the old.
Ride Safe,
Harold
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,092
Likes: 7,615
From: Poolville
Do yourself a favor and don't get discouraged. It is not an easy task to tune with the Wego. It takes a lot of patience and time.. You'll get there though.... None of us are experts but we are experienced...... Remember, Life is a learning curve....
Thread Starter
|
Tourer
Joined: Jul 2006
Posts: 298
Likes: 12
From: Villa Rica, Georgia
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,079
Likes: 2,151
From: Ohio
Hotrod is correct on the erratic graph, that Fatcat is allowing a lot of air to come backwards by reversion when slowing down or letting off the throttle, noticed the bad spikes on rpm drops but it is common to see 16-1 or 18.1 using the engine to slow down.
Went over the last run spread out on my software, idle is good, cruise is good and wot is perfect, noticed lower rpms are in the 12.8. You only need 3 areas of tuning with the Wego with cruise for fuel mileage, wot for power and safety from detonation, idle for to prevent engine heat. Low rpms isn't as important because it is hard to get right because the accellerator pump is usually in play. I'll use the digital read out to tune the 3 main areas and might use a graph on a wot run if running deeper in rpm's with higher gears.
As Harold found out, don't overthink this tuning with a carb, it is a controlled drip, not a precise EFI that can change AFR's by .01 at a time.
The 4th graph is the only one that is off rich but on accelleration and most likely the pump hasn't cleaned up yet, that is why lower rpms are hard to do and a throttle roll on is impossible unless you turn the pump off
Went over the last run spread out on my software, idle is good, cruise is good and wot is perfect, noticed lower rpms are in the 12.8. You only need 3 areas of tuning with the Wego with cruise for fuel mileage, wot for power and safety from detonation, idle for to prevent engine heat. Low rpms isn't as important because it is hard to get right because the accellerator pump is usually in play. I'll use the digital read out to tune the 3 main areas and might use a graph on a wot run if running deeper in rpm's with higher gears.
As Harold found out, don't overthink this tuning with a carb, it is a controlled drip, not a precise EFI that can change AFR's by .01 at a time.
The 4th graph is the only one that is off rich but on accelleration and most likely the pump hasn't cleaned up yet, that is why lower rpms are hard to do and a throttle roll on is impossible unless you turn the pump off
Last edited by 1997bagger; Jan 26, 2019 at 11:55 PM.
Thread Starter
|
Tourer
Joined: Jul 2006
Posts: 298
Likes: 12
From: Villa Rica, Georgia
If you guys think my fatcat is causing the reversion what do you think of an rb racing pro stock 2-1? I have one here that used to be on it. I replaced it because it was L.A.F., sounded real nice just very loud. Not too bad riding around but on the highway its like having a nascar next to you. I have a baffle for it that rb sells, it does take a little of the edge off but still loud. They claim their collector design keeps reversion down and improves scavenging. It has an o2 sensor port in the front pipe and it 1 3/4 inch diameter. I could change it out in no time, let me know what you think.