New Project - Tuning my 3.4L for POWER

[insite]

here are a few more test points. when i collected the last data set, everything was a lot leaner than i had planned. i was missing some AFR's that i wanted to log. here they are:

[insite]

so i made the changes to achieve the top line HP/TQ values across the RPM range. the result is around 2.5% gain from 4500RPM on up. there is also a torque gain down low, the result of ADDING fuel below 2800 and pulling fuel above that.

i think the low end torque is noticable. the high end HP is harder to feel. i also have concerns running AFR above around 13.2 for temperature purposes. EGTs will start getting high above that. so will combustion temps, which will increase propensity to knock. i did check w/ the optimal program below; no knocking or pulled timing.

[j.fro]

This is great info, but I am lost on one important bit...how are you getting the ECU to add/subtract fuel from the regular programming?

[insite]

Originally Posted by j.fro

This is great info, but I am lost on one important bit...how are you getting the ECU to add/subtract fuel from the regular programming?

i use a piggyback fuel controller. it splices into the MAF signal. at full throttle, our cars use the MAF signal + a stored map to determine fuel. the fuel controller monkeys with the MAF reading at the ECU to trick it into adding / pulling fuel. the unit is an APEXi AFC Select. pretty slick.