Draw backs of eliminating O2 sensors
#11
all in conjunction with the O2 sensors. They work together as a team. And the effect is not as dramatic as a carb, yet there is an effect.
Last edited by rounder; 06-30-2010 at 11:59 AM.
#12
Doesn't the FuelMoto EFI tuner work by replacing the O2 input to the ECM? If so, this will effect the closed loop areas only. Closed loop operation is controlled by the O2 sensors only. So you will have no control over open loop areas of the map.
You might be satisfied with this, but the best results will come from using a real tuner like an SESTP or TTS.
You might be satisfied with this, but the best results will come from using a real tuner like an SESTP or TTS.
#13
There is an article in July AIM by Dr. Dyno. He kinda suggests that in Closed loop operation the only thing that comes into play are the O2 sensors. If they sense a lean condition (greater than 14.6) they tell the ECM to go richer, if they sense a rich condition (lower than 14.6) they tell the ECM to go leaner.
The other sensors and tables come into play in open loop Operation. This according to Dr. Dyno.
The other sensors and tables come into play in open loop Operation. This according to Dr. Dyno.
#14
That's what I was thincking. With the limited amount of mods I plan on doing to the bike I'm kinda in a toss up with a PC type tuner of just using a Fulpack.
Your right. More air in + more air out = more power. But I'm not really worried about squeezing out every pony I can. The bike is plenty fast for me as it is and I just want it to look and sound good without worring about it blowing up cause it's running to lean.
Your right. More air in + more air out = more power. But I'm not really worried about squeezing out every pony I can. The bike is plenty fast for me as it is and I just want it to look and sound good without worring about it blowing up cause it's running to lean.
The Fuelpak requires a Stage I filter.
I don't understand why it would run too lean if all you do is replace your pipes and leave everything else alone. Unless you're going with something totally absurd, which I don't think you are.
But..... There's a lot of things I don't 'get.'
#15
Thanks for all the replies on this subject guys. I'm not completely oblivious to the tuning process...I've done my cars, I've just never done anything with a bike. That is why I like the ideal of keeping the O2s. Like I said before I'm not looking to make huge power with my Bob. I just want it louder which is why I'm not too concerned with a stage 1. I like K&Ns products and the fact that they are reusable so I plan on sticking with a drop in. But I know enough about EFI that changing out the pipes is gonna have an effect on the tune. I'm looking for something simple that will keep the bike safe and not have to worry about the problems that come with messing with too many paramiters.
#16
The Fuelpak requires a Stage I filter.
I don't understand why it would run too lean if all you do is replace your pipes and leave everything else alone. Unless you're going with something totally absurd, which I don't think you are.
But..... There's a lot of things I don't 'get.'
I don't understand why it would run too lean if all you do is replace your pipes and leave everything else alone. Unless you're going with something totally absurd, which I don't think you are.
But..... There's a lot of things I don't 'get.'
#17
Thanks for all the replies on this subject guys. I'm not completely oblivious to the tuning process...I've done my cars, I've just never done anything with a bike. That is why I like the ideal of keeping the O2s. Like I said before I'm not looking to make huge power with my Bob. I just want it louder which is why I'm not too concerned with a stage 1. I like K&Ns products and the fact that they are reusable so I plan on sticking with a drop in. But I know enough about EFI that changing out the pipes is gonna have an effect on the tune. I'm looking for something simple that will keep the bike safe and not have to worry about the problems that come with messing with too many paramiters.
But you (we) don't have four O2 sensors, just two, and they're before the exhaust body. And I don't believe the O2 sensors and 'backpressure' have anything to do with each other. All the O2 sensor does is measure the amount of oxygen present in the exhaust gas. And it only works in closed loop for the most part.
Besides, as I've noted before, 'backpressure' is probably the most misunderstood term in the internal combustion engine world. Velocity, wave reversion, scavenging, all mean something to me. 'Backpressure'? I dunno.
I'm NOT trying to tell you what to do. It's all very mysterious to me.
Before I installed my slip-ons, I took note of a lot of back-and-forth on this forum. Especially about 'decel-pop' etc. I listened to my stock exhaust and -- Know what? It was there BEFORE I put my slip-ons on the bike. It's just G.D. near impossible to hear because the stockers are so quiet.
Now, I can hear it but I kinda dig it. But I've been accused of being different.
#18
Thanks for all the replies on this subject guys. I'm not completely oblivious to the tuning process...I've done my cars, I've just never done anything with a bike. That is why I like the ideal of keeping the O2s. Like I said before I'm not looking to make huge power with my Bob. I just want it louder which is why I'm not too concerned with a stage 1. I like K&Ns products and the fact that they are reusable so I plan on sticking with a drop in. But I know enough about EFI that changing out the pipes is gonna have an effect on the tune. I'm looking for something simple that will keep the bike safe and not have to worry about the problems that come with messing with too many paramiters.
The biggest difference between tuning a car and these HD bikes is HD's airpump efficiency is restricted by the air intake The exhaust pipes are too short to matter much. You can basically do anything with the pipes and not affect the tune much (you do lose a bit of torque because the stock mufflers do provide just a bit of back pressure). So play with the pipes as much as you want, it won't hurt nuttin. Play with the intake much and you also should think about the effects of a too lean A/F mix.
#19
CB
#20
Which sensor adjusts for a tank of 15% ethanol then 10% and then 0%, then 5%.... ?
I dunno.
Thread
Thread Starter
Forum
Replies
Last Post
06, benefit, dyna, eliminate, eliminating, glide, harley, motorcycle, o2, oxygen, performance, sensor, sensors, super