Fuel tables when boosting

[phuz]

Correct me if I'm wrong, but I understand the ECM will calculate fuel first from the Fuel -> Open Loop -> EQ Ratio table, and then under PE (in my case 75kpa and 50% torque minimum), it will apply the Fuel -> Power Enrich -> EQ Ratio multiplier. But that EQ Ratio multiplier is only a function of RPM, so once you enter PE, can you only adjust the fuel adder based on RPM?

Ideally, I'd like to control fuel (and spark, too) with not just RPM, but also MAF, so I know when the cylinder has the largest charge.

[aruss99]

If you are boosted you can adjust the boost enrichment table which goes off of engine vacuum. Not sure about if there is anything other than RPM fueling adjustment on the stock OS

[phuz]

If you are boosted you can adjust the boost enrichment table which goes off of engine vacuum. Not sure about if there is anything other than RPM fueling adjustment on the stock OS

There is no boost enrichment table because it's a factory NA motor with 0-105kpa range (full vacuum to 0psi) sensor.

[kingtal0n]

I think you need the OS upgrade which supports boost pressure and a 2-bar or 3-bar map, otherwise how will you tune for boost pressure? You can't really tune for boost without some way to tune for boost... hmm

Once you get boost enrichment table you can adjust the timing table and a table called "AFR advance" to dial in the timing as needed.

[GHuggins]

You should really post the tune. As stated you probably have an OS patch available, but if not you can also change the axis and input the correct map values for your map sensor, so the ecm can see boost. Then also as stated you can tune just like the OE did - use regular spark for non PE and then the PE adder table for PE....

[phuz]

You should really post the tune. As stated you probably have an OS patch available, but if not you can also change the axis and input the correct map values for your map sensor, so the ecm can see boost. Then also as stated you can tune just like the OE did - use regular spark for non PE and then the PE adder table for PE....

You would think with the MAF. But that's why I inquire.

[kingtal0n]

I recommend eliminate the MAF unless you are an experienced MAF tuning expert with forced induction applications.

I have successfully tuned hundreds of maf turbo vehicles (mostly Nissan/Toyota) but I wouldn't recommend it to anybody that is new to maf tuning with access to a MAP

[phuz]

I recommend eliminate the MAF unless you are an experienced MAF tuning expert with forced induction applications.

I have successfully tuned hundreds of maf turbo vehicles (mostly Nissan/Toyota) but I wouldn't recommend it to anybody that is new to maf tuning with access to a MAP

I have never tuned MAF. Everything has been MAP, but I did email the guy who is going to dyno-tune this and he highly recommends MAF, so I will leave it as is; although I think I want to convert from 1-bar to 2-bar so that I can have boost compensation, since I'm seeing the MAF is only good to 540whp (476 g/s), and based on my calculations at 6400rpm, 8psi of boost, and 95% VE, it will be flowing somewhere around 600 g/s. So tuning strictly off MAF and PE means that you are going to be adding fuel to areas that don't necessarily need it just so you have enough in the area that you do.