MicroSquirt.com read only forum (Jan.15,2018)

Hiya guys,

Could somone please ahve a quick look at my first AFR table, check it look ok and give me some feedback on it. I am aiming at slighly rich at idle, lean at low power and rich aproaching boost.....

Many thanks

Dave

i think is looks good.

Maybye a bit richer, but not sure

Hiya,

A bit richer in which area??

Many thanks

Dave

Nice blend and a lot of work. Boost maps are a bit weird. I'd say you could use what you've made and tweak it from there with one change. Richen all the bins from your cruise rpm's and up at all MAPs, so you have an idle pocket and a lean cruise pocket and everything else is rich for power and CYA. This is to ensure that - for example - if you lift the pedal a bit then stab it again you won't spike lean as you pass 5500 rpm's at 55kPa and back.

There are two schools of thought - blend and no blend. The no-blend school says that if you're cruising you want it lean and if you're not you want it X rich. Say you cruise the highway at 70kPa and 2200 rpm. With this map you'd want maybe even 16:1 cruise (whatever your engine will tolerate) in all bins up to, say, 85kPa and 2700rpm. All the other bins outside of that rectangle would be full rich (whatever your engine needs but start safe) of say 12:1 so you're either cruising or racing depending on your pedal. Works well.

The blend school is similar but accounts more for tweener power such as passing on the highway. You don't need 12:1 at part throttle as the engine doesn't require that richness but 16:1 isn't enough. You can save some gas with this type of blending, especially if you're the type that plays the pedal a lot, but will take some tweaking. Works well and saves gas.

In either case start much richer for safety in boost. I think this is what cossie_storm was indicating. You may want to start with a safe richer no-blend map and tune to a blended map as you find what your engine needs. Remember, this is an AFR map and not a VE map, so the pretty blended colors don't apply here as much. What you have created is a blended map based on info we don't have yet - what the engine actually wants.
Now back to work! Mod that map, start driving and tune that thing!

Thanks PSIG, i'll get to work on it this eveing...

What does MS actually use the AFR table for, is it only used for EGO correction targets?? Or have i got it completely wrong :-/

Many thanks

Dave

Thanks PSIG, i'll get to work on it this eveing...

What does MS actually use the AFR table for, is it only used for EGO correction targets?? Or have i got it completely wrong :-/

Many thanks

Dave

You're right - depending on how you set it up. The primary calculations are from the VE table and then MS hunts to match the AFR table from there as a secondary operation. It's not a crutch or gap-filler. The closer the VE table the less hunting MS has to do and therefore the more accurate (and more efficient or powerful and safer) the engine is from squirt to squirt.

Hope that helps,
David

Hiya,

Many thanks for all your help.

Dave

quattrodave wrote:Hiya guys,

Could somone please ahve a quick look at my first AFR table, check it look ok and give me some feedback on it. I am aiming at slighly rich at idle, lean at low power and rich aproaching boost.....

Many thanks

Dave

Dave,

Are you setting this up for an Audi? If you are, those MC1 motors tend to like to run on the rich side. You might want to change those 15 afr to 14.5-14.7. They also like the rich idle, ~ 60-65kpa. Besides that your table looks good.

Hiya,

Thanks qadir03,

I'll give it a go....


Many thanks

Dave