New Project - Tuning my 3.4L for POWER

[insite]

ok, ran test points & did tuning. the logworks program is calculting power & torque using gear ratios & RPM. problem is, i still can't get the RPM channel to log with a frequency greater than .83s. it's choppy. the program has a smoothing function, but there is a great deal of sensitivity to how the data is chopped up.

i developed a method that is consistent; i used it across the board for these graphs. don't pay too much attention to the absolute numbers. just compare the output. the thick line is the baseline run. also of note; the percent AFR change on the fuel controller does NOT equate 1:1 with an actual change in AFR. i had to play with it a lot to get the test points i wanted. here are the first seven;

[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.