Tune your bike to the limit with our advanced ECU Flashing products for Kawasaki, Honda, Suzuki, Ducati and Yamaha motorcycles.
Woolich Racing - Tune your bike to the limit
CONTACT US

User Support->Settings

Cylinder offset

 Re: Cylinder offset
I am just following up on some older posts, thought i would be useful to clarify the unify cylinder map option in case some one comes across this post in the future. The concept of unifying the maps and maintaining cylinder offsets is that the factory has spent time working out what each cylinder needs relative to the other cylinders. For tuning it is easier to tune 1 unified map. So the Unify with Maintain Cylinder Offset allows you to edit one unified map, and each of the underlying maps is modified by the same amount while still maintaining the factory cylinder offset amounts.
 
 Re: Cylinder offset
The physical parts of the bike don't change when flashing the ECU. If the designers found that the inner cylinders run 3% richer then the outer cylinders and added an offset to correct this in the fuel maps, this should make the reading on the O2 sensor accurate for all cylinders. If you unified all the cylinders you would have some set a bit lean and some a bit rich to get to your AFR where you wanted it. I think one of us does not understand what "Unifying the Fuel Group Maps" means. I am not sure about you but my understanding is that they are only become linked together so when making changes (like using the Autotune) applies the changes to all of them by a set amount, but that does not mean they are the same. It simply works like making changes to a single map instead of going through each one individually. Same with the Unifying the Fuel Cylinder Maps. Can someone with more in depth knowlege please clarify this? As to the offset I think your explanation is a bit difficult to accept because if that was the case (the designers found that the inner cylinders run 3% richer then the outer cylinders) it implies that it is there to cover for a bad design which I very much doubt. And also the O2 sensor accuracy does not depend on how reach or lean the engine is running. It measures just what it is. I doubt all cylinders fill in exactly the same way and need exactly the same amount of fuel to get exactly the same afr. You are saying we live in a perfect world! :D I had a Busa apart and even the intake trumpets were different lengths, must affect tuning? I remember from the old days of CARBS that they would have different jets so it seems logical to me that modern bikes would have different maps for different cylinders. I have been told that even my 2 bikes (TL1000R and M1800R) which don't have inner and outer cylinders have different maps. I'm sure someone can explain the 'Unify' function better then I. I thought it was simply adjusting all the maps at once. Nothing to do with offsets. That's a different function? My point about the rich/lean cylinders was simply if one was rich and one was lean the average would be a mix of the 2. So it could make a difference if you removed a factory offset. What if one cylinder was running very lean and one very rich. would the AFR your measuring be correct for either cylinder? Plenty of video's on the tube showing that measuring all 4 cylinders from 1 central point can lead to overheating of one cylinder (faulty injector). So it measures what it thinks it is not always the same as what it actually is when you have more then 1 ;)
 
 Re: Cylinder offset
The physical parts of the bike don't change when flashing the ECU. If the designers found that the inner cylinders run 3% richer then the outer cylinders and added an offset to correct this in the fuel maps, this should make the reading on the O2 sensor accurate for all cylinders. If you unified all the cylinders you would have some set a bit lean and some a bit rich to get to your AFR where you wanted it. I think one of us does not understand what "Unifying the Fuel Group Maps" means. I am not sure about you but my understanding is that they are only become linked together so when making changes (like using the Autotune) applies the changes to all of them by a set amount, but that does not mean they are the same. It simply works like making changes to a single map instead of going through each one individually. Same with the Unifying the Fuel Cylinder Maps. Can someone with more in depth knowlege please clarify this? As to the offset I think your explanation is a bit difficult to accept because if that was the case (the designers found that the inner cylinders run 3% richer then the outer cylinders) it implies that it is there to cover for a bad design which I very much doubt. And also the O2 sensor accuracy does not depend on how reach or lean the engine is running. It measures just what it is. My understanding is that even if you are presented a single map in autotune, internally the ECU group and cylinder maps are still separated. The WRT software propagates the changes for you and in the case of "maintain cylinder offset" the values are propagated in a way to retain the original ratios. The cylinder maps are identical for cylinder 1-4 and 2-3. SInce cylinder 2-3 are heated on 2 sides instead of 1, it has to be expected that they might benefit from a different AFR.
 
 Re: Cylinder offset
The physical parts of the bike don't change when flashing the ECU. If the designers found that the inner cylinders run 3% richer then the outer cylinders and added an offset to correct this in the fuel maps, this should make the reading on the O2 sensor accurate for all cylinders. If you unified all the cylinders you would have some set a bit lean and some a bit rich to get to your AFR where you wanted it. I think one of us does not understand what "Unifying the Fuel Group Maps" means. I am not sure about you but my understanding is that they are only become linked together so when making changes (like using the Autotune) applies the changes to all of them by a set amount, but that does not mean they are the same. It simply works like making changes to a single map instead of going through each one individually. Same with the Unifying the Fuel Cylinder Maps. Can someone with more in depth knowlege please clarify this? As to the offset I think your explanation is a bit difficult to accept because if that was the case (the designers found that the inner cylinders run 3% richer then the outer cylinders) it implies that it is there to cover for a bad design which I very much doubt. And also the O2 sensor accuracy does not depend on how reach or lean the engine is running. It measures just what it is.
 
 Re: Cylinder offset
The physical parts of the bike don't change when flashing the ECU. If the designers found that the inner cylinders run 3% richer then the outer cylinders and added an offset to correct this in the fuel maps, this should make the reading on the O2 sensor accurate for all cylinders. If you unified all the cylinders you would have some set a bit lean and some a bit rich to get to your AFR where you wanted it.
 
 Re: Cylinder offset
Intake plenum and exhaust manifold design will cause cylinders to flow a slightly different amount of air. Thus the alternate tables per cylinder. It can be enough to have one cylinder off 0.5 AFR off from another in some designs. Thanks for your reply. I understand that each cylinder will flow differently due to the machining tolerances of all the parts, headers, the air box design etc. However since the wideband sensor is mounted in a collector pipe the AFR readings are average of the all cylinders. Is that right? If so, then what is the reason for maintaining the cylinder offset? The reason is to recover the information loss due to AFR unification, taking advantage of the original design.
 
 Re: Cylinder offset
Intake plenum and exhaust manifold design will cause cylinders to flow a slightly different amount of air. Thus the alternate tables per cylinder. It can be enough to have one cylinder off 0.5 AFR off from another in some designs. Thanks for your reply. I understand that each cylinder will flow differently due to the machining tolerances of all the parts, headers, the air box design etc. However since the wideband sensor is mounted in a collector pipe the AFR readings are average of the all cylinders. Is that right? If so, then what is the reason for maintaining the cylinder offset?
 
 Re: Cylinder offset
Intake plenum and exhaust manifold design will cause cylinders to flow a slightly different amount of air. Thus the alternate tables per cylinder. It can be enough to have one cylinder off 0.5 AFR off from another in some designs.
 
 Cylinder offset
Have a quick question to those in the know. What is the advantage/ reason for having the ignition/fueling offsets between the cylinders? I understand they are tuned slightly different but I am after the reasons for it. Wouldn't it be better to have them all the same?
 
 
View Topic on the Woolich Racing Forums
 
OUR PRODUCTS SUPPORT OUR COMPANY  
Suzuki ECU Flashing
Kawasaki ECU Flashing
Honda ECU Flashing
Yamaha ECU Flashing
Ducati ECU Flashing
Woolich Racing Merchandise
What Harness for Bike?
What Bike uses Harness?
Woolich Racing Tuned (WRT) software
Woolich Racing MapShare
USB D (Denso)
Log Box D (Denso)
Log Box Pro D (Denso)
USB M (Mitsubishi)
Log Box M (Mitsubishi)
Log Box Pro M (Mitsubishi)
Zeitronix Wideband O2 Products
Tuning Shops and Dealers
Support Center
Support Tickets
Video Tutorials
User Guides and Installation Instructions
COM Port Drivers
Woolich Racing Forums
User Support
Contact Us
About Us
Official Technical Partner WorldSBK
Electronic Mapping - Plug and Play Performance
Woolich Racing News
Testimonials
Terms and Conditions
Privacy Policy
Woolich Racing page on facebook
Woolich Racing on YouTube.com
Woolich Racing Products are Intended for RACE USE on CLOSED CIRCUIT ONLY

© Woolich Racing and www.WoolichRacing.com, 2011-2017. Unauthorized use or duplication of any of the material on this website without express and written permission from this website’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Woolich Racing and www.WoolichRacing.com with appropriate and specific direction to the original content.