Hi all.
following my troubles with MFI, ive converted my car to EFI using a fiesta EFI manifold, and Ive gone for Microsquirt. I also have a AEM UEGO wideband AFR, so by setting up the AFR table correctly, it will adjust my fuelling to match, and I dont have to create my own fuel map (apart from the idle section)

im running quite a rich AFR table at the moment just to play it safe, ive also got a direct compressor to actuator connection so im only running 7psi, this will be changed when im happy with the base settings.

this is my AFR target table:




ive marked the 0.0psi on there which is 100kpa barometric pressure, Ive had to get used to working in KPA as opposed to PSI, but if you are not familiar kpa and bar are related (100kpa = 1.0 bar).

your thoughts are appreciated, anywhere you think I need to tweak before I load this map and try it?

ill probably post up my spark advance map soon too, and ask for you views on that!!

Thanks in advance!!

 

Personally i'm in the high 11s AFR until 1bar of boost, then at 1 bar i taper it down to high 10s by 1.2bar. Which im running.

Not using closed loop yet though, just adjusting fuel loads etc on the fly

 

Hi Pete, I use MS3pro on my YB though I've no experience at all of Escort RS Turbo!

i think any afr figure which starts with'10' is too rich and anything starting with '16' may be too weak!

 

Cheers guys, I may be bring a little cautious with the 10’s , but I can always pull it up a little there.
agreed the 16’s are to high, but the area on the table that I’ve put 16 would only ever be on over-run, as they are on high vacuum at mid revs.

thanks for the input 👍 I’ll let you know how the testing goes.

 

don't know what MS version you're using but does it not support Over Run Fuel Cut?

if you use that then you don't need to accommodate high vac / closed throttle overrun conditions in the map as the value map is over ridden and ecu simply cuts ALL fuel.

 

I’m using Microsquirt V3, yes it does have fuel cut off. But I haven’t set up it up yet.
as suggested I’m setting up base fuelling and then I’ll add cut off, WUI, AE etc.

 

you might get better fueling resolution by changing the map axis values so you have more which are under 101kpa than above it.

maybe 30/45/55/65/75/85/95/100/140/170/200/250 or something like that.. most driving is done in lower kpa map value regions and the change in fueling requirements is more pronounced in those areas than under boost conditions.

of course, it you are only using the AFR table in Tuner Studio a reference (rather than "Incorporate AFR Table") its academic but it still makes sense to use the same axis values as those in the Fuel VE Table 1 otherwise it can get confusing

 

also, is 6500rpm the limit?

 

ah yes very good point, I tred to make it linear, but thats not really required.. Ill amend my table to suit, and yes im incorperating the AFR Table, as it seems a lot more logical way to tune the car, given that a have a wideband fitted.

On the rev limit, I should be ok for a little more as I have :

forged Accralites pistons (8.00:1 CR)
steel rods
lightenened flywheel and crank
Piper 285T cam.
cosworth Hybrid T3
airtec single pass FM intercooler

 

I like to retard timing a little on the base line over 2000rpm so it burbles nicely on over run. I then have my "over run fuel cut" on a 5 sec delay so it burbles for a bit then cuts fuel and goes to a "flat" over run exhaust tone.

I am yet to venture into setting up an AFR table with closed loop fuelling. My AFRS are pretty consistent, there is the occasional spike or drop now and then which when i try to map out it makes the car drive horribly. So I'm fast learning that once it drives nicely the AFRs to a degree are irrelevant.

 

I noticed that last night on my testing runs, I like the burble, better than the overrun quietness!
after looking at my logging,its not really following my afr table very well, so ill drop to trying to tune VE instead.
its running well now,still a little rich, but Im being cautious and pulling it lean slowly.
my one bug bear is the just off idle dead spot I have. Its going to be a tweak with AE, but not sorted yet!

next is to work on my spark table.
how areyou getting on with your idle issues Roger?

 

Yeah, i was always led to get the VE table 75-80% good before allowing the AFR closed loop to take over. TBH i've never felt the need to go for closed loop in the 2 or 3 years ive had the car on the road with the ecu.

I need a decent set of Det cans before starting to dial in some advance whilst on boost.

She idles lovely at around 1100-1200rpm, but when its hot and all the electrics are on it drops down to such low RPMS (700rpm) it sounds like it will stall. I need to learn how to set up closed loop idle. Any good guides online?