I have just got my JDM PRC with wideband working 100%.
So its time to tune the fuel using the wideband air/fuel sensor.
So I go for a drive 4th gear pull from 2000rpm until redline. I do this a few times whilst saving the datalogs. I then compare the target lambda with the recorded and view what % adjustment is recommended.
The question is have is - do i conduct this drive in open or closed loop?
Question about tuning with Wideband
Question about tuning with Wideband
Last edited by yellowle on Thu Jun 17, 2010 4:53 pm, edited 1 time in total.
YLE
The reason I ask is because I find it easier to tune in Closed Loop.
This way I'm always at 14.7:1 and never really lean or rich at part throttle.
I've done it this way on my S300 and now my K-Pro.
Currently my Long Term = 0, Short Term +-3% & WOT is within a few percent too.
I adjust my part throttle fuel according to the Short Term figure at any given constant.
I guess there's more way to skin a cat...
This way I'm always at 14.7:1 and never really lean or rich at part throttle.
I've done it this way on my S300 and now my K-Pro.
Currently my Long Term = 0, Short Term +-3% & WOT is within a few percent too.
I adjust my part throttle fuel according to the Short Term figure at any given constant.
I guess there's more way to skin a cat...
Ian
Morris Mini (B18C-R)
Honda Civic Type R (FD2)
Honda Civic Type R (FK2)
Morris Mini (B18C-R)
Honda Civic Type R (FD2)
Honda Civic Type R (FK2)
Thanks Guys
Ian - you make sense - I am just tweaking now - but tuning in closed loop even with part throttle over the widest possible MAP range seems sensible. Then I look at the trimming is occurring and tweak where necessary.
How many hours do you need to run the engine before a "long term" trim becomes evident?
thanks
Kevin
Ian - you make sense - I am just tweaking now - but tuning in closed loop even with part throttle over the widest possible MAP range seems sensible. Then I look at the trimming is occurring and tweak where necessary.
How many hours do you need to run the engine before a "long term" trim becomes evident?
thanks
Kevin
YLE