Quick LLY Fuel Injectin Table question

[Chavez91]

Lets say you command 110mm3 does the computer just command the 100mm3 pulse width? If so, is there any benefit of commanding any higher than 100mm3? I noticed all the other tables go up to 110mm3 and higher (specifically the boost tables).... and is there a reason it only goes to 100mm3?

Thanks!

[cumminsDK]

Good question, and i don't know the answer, but a good way to find out is to open up all limiting tables to allow 110mm3 or a little higher then without changing the main injection pulse tables command a higher mm3. Then go drive the truck and log main injection pulse and mm3. See if the pulse goes higher when commanding say 115 mm3 versus commanding only a max of 100mm3. If pulse goes higher commanding 115mm3 then there is a benefit, but i would say it will be minimum if it does any good at all!

[THEFERMANATOR]

If it's like the LB7(I'm assuming it is since they are both DELPHI) ,then many tables go above 100MM3 of fuel but the ECM can only command what is listed for 100MM3 of fuel max. I normally set them up to go to about 102-105 just to make sure it hits max fueling, but I know others will command 120 even though it gives no more fuel after it hits 100MM3 of fuel. I've ran logs of this as well, and once it hits 100MM3 of fuel, the pulsewidth will be capped. So lets say you have 2000USEC at 100MM3 of fuel, going to 120MM3 of fuel commanded will still only give you a 2000 USEC pulse. I know some tables can command higher than 100MM3 of fuel, but if you notice there will be limiters to over ride it and teh limiters take precedence over the command tables.

[Chavez91]

I noticed that we can change and edit the Rpm Axis using the RPM Axis break point table A9001, But there isnt a table or a place anywhere to add more fields to the mm3 axis is there? lets say 105mm3 or 115mm3... or to even edit it like you can the rpms?

[THEFERMANATOR]

The ECM is mapped out to only go to 100MM3 of fuel which is more than enough to get whatever fueling you want once you modify your pulsewidth tables. Theres really no need to make it go higher up in the MM3 of fuel.

[Chavez91]

Alright! Thanks for the help! :mrgreen: