I am down to just two topics left to complete the tune on my '7747 $42 TBI install. By the way, just had to say how thrilled I am with the fuel economy. I have a Toyota FJ40 with a 305, 4L60, stock 4.10 gears running on 36" tires. With my HEI and Q-Jet I was happy to get 12 MPG. My last highway run got 15.6 MPG for a 30% gain.
My remaining tasks are to get DFCO working (or not if it turns out I hate it) then Highway Lean Cruise.
First up, DFCO. At first I wanted to see if I could make use of DFCO for very slow downhill trail driving. I have given up on that. DFCO in general is not engaging. I have stock parameters and feel the cause is the enter/exit MAP. The remaining values should be easily met. %TPS is also an issue, but only because I have not zereo'd out the TPS yet. TPS is 3 to 4% at idle and the DFCO %TPS is 3%.
My MAP settings are:
Enter 20.63
Exit 31.88
My logs show that I usually run at 33 to 35 KPa on deceleration. I idle at about 45 KPa.
Would the above settings preclude ever entering DFCO?
I envision the following settings to make it work
Enter 35
Exit 39
Can someone advise me on this?
Thanks,
Steve
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