Air fuel ratio for tuned Micra?

[Daniel_]

Hey, maybe someone familiar with the original mapping of K11's can chime in here

I am looking for more miles/£, and slightly increase the power output in my daily CG10DE. To make more power, I installed a set of 1.3L camshafts. To make it more economical, I am converting over from petrol->ethanol fuel. The ethanol(E85) conversion is accomplished by a piggyback injector box.

I am already familiar with using E85; in my project car i increased base fueling by 25-30% over the whole fuel map. There I have the luxury of using an AFR gauge, something that the Micra does not have. So I am blindly guessing for now, +25% should be pretty good starting point.

After adding the camshafts, I suspect even more fuel is needed. I set the base enrichment to 33%, anyone think this is OK?

One final thing, since ethanol requires more timing advance, I set the car into timing mode and set the dizzy to 20 deg base timing. It is better to set it properly in the ignition map, since different loads require different amounts of extra timing, but keep in mind that this is a budget build. +5deg global timing advance seems fairly mild for a CG engine (my SR20VET runs +7-10deg with ethanol)

Questions:
-What does the AFR plot look like under WOT for a 1.0L engine?
-How much more fuel would you guess is needed with 1.3L camshafts? 5%-10%?

Thanks for looking!

 

[pollyp]

not sure what base fuel enrichment means. further enrich over the existing fuel map? is this a piggybank or standalone?

if it helps, here's a nistune doc explaining some features.
http://www.nistune.com/docs/Workshop Training Notes Web.pdf

here's some comparisons of all my nistune maps
https://www.micra.org.uk/threads/pollymobiles-rebuild.35251/page-108#post-685380

and this is when I was tweaking my cold start enrichment to improve firing up
https://www.micra.org.uk/threads/pollymobiles-rebuild.35251/page-104#post-661816

 

[Daniel_]

Thanks, and yes, it is only enrichment over existing fuel map. Very nice to see what the ignition map looks like. Unfortunately the fuel maps are expressed in raw units instead of msec injector opening, so not that useful.

I was hoping someone would have a plot of AFR during wot, either from a dyno run or just a wideband reading of a stock Micra.

 

[frank]

glenj had some dyno runs done on his 1.0 grasstracker daniel, iirc the afr was pretty good then went mega rich at the topend

 

[pollyp]

here's the AFR graph of when I used to run janspeed 421 system