Fuel Tuning and Settings

On the menu today:

• WUE - Warm Up Enrichment
• AFR Table 
• Incorporating AFR in to VE table
• VE Table
• EGO - Exhaust Gas Oxygen
• AE - Acceleration Enrichment 
• Over-Run Fuel Cut

WUE - Warm Up Enrichment

Warm up enrichment, is there to help a cold engine run smooth up to operating temperature.

Normally when warm (85C-90C) the enrichment will be 0, meaning 100% of VE table.

Registered TS (TunerStudio) can auto tune WUE, works great.

If you tune it yourself you want to increase VE % just above the point where the engine is straggling when warming up, try to keep it around 14.7 or a little richer.

Before we start tuning the fuel, I want to explain my strategy.

1. Setup AFR table

2. Enable a cool feature that will make VE tuning very simple.

3. Tune VE table to reach the AFR targets we set in AFR table.

AFR Table:

Is the table that holds your "wish list", where you just put in what AFR you would like to see in each area of the engine operation range (idle, cruise, boost, deceleration etc')

Guidelines:

For idle I found that an AFR of 13.5 is great for me. (Probably because of batch fuel injection, I believe when I will upgrade to sequential injection idle AFR will be 14.7:1)

Cruise 15-16
Deceleration 15-16

Boost 11.5-12

This is my AFR table, it's aggressively lean.

Cool feature:

What we just did is telling the MS to use the value from the AFR table when calculating fuel to squirt.

Meaning, after finishing the first VE tune to match the AFR table we will not need to touch the VE table again (no need to tune the VE any more...)

Any change we want to make to our fuel map we will make through the AFR table.

Example:

Your cruise AFR is 16 and it is too lean(misfire), all you have to do in order to change it, is just to change the AFR cells you want in the AFR table.

Because the AFR target value is incorporated in the fuel calculation, the VE outcome (squirt) will change accordingly.  

Got it ? good.

VE Table:

This is how you look at a VE/AFR table:

This table is for naturally aspirated engine - idle, cruise and deceleration are the same for forced induction.

The 95-100 kpa range you can set up leaner and 100-200 kpa you scale from 13 to 11.5.

In the picture you can see that cruise cells are 1100-2000 rpm and 45-75kpa, could be your car cruises in a different rpm/kpa range - log it, check it, and AFR it accordingly. 

After you got your AFR table right you can auto tune or manual tune till the VE table reach the  AFR target table.

Now we have a nice AFR table, tuned VE table and an easy way to tune without tuning ;)

Next we need to look at EGO - Exhaust Gas Oxygen.

This nice little mechanism will help us keep our AFR right even at different CLT and IAT.

Works great !

Important pointers:

Controller Auth: is the max VE % you allow the MS to change.

Next: AE - Acceleration Enrichment and Over-Run Fuel Cut