EFIDynoTuning Forum

Update: Adding additional crank PW (Load) has helped. I opened the throttle bypass more during cranking and In addition: I reduced returnless pump prime time to almost nothing. I am getting better “torch-offs” now

I cannot say I fully understand man_vol but in my case I was way to small a figure and that was causing problems. I went ahead and bumped it to 40 liters (60 is stock) and it drives damn better. At least I am in the “zip code” for transient fueling. I also had noticed the ** asterisk notation of the parameter. I’m curious if there is a way to clearly identify how much scaling has taken place. I will reference Mr Ponto’s write ups again to find out myself.

I appreciate and I am also grateful for the forum and the support!

Also forgot to note that mod max piston charts may not be organized quite well and is a best guess from what I had calculated. CPs are good pistons but a custom piston isn’t really more expensive. Might as well stroke the motor a touch while you are there.

I plan on doing a similar build. I purchased pistons from mod max and am pleased with the cp pistons they offered. If I was to go again (especially NA) I would go with custom mmr (manleys) and a coyote crankshaft with gen 3 coyote rods. To answer your question: 11:5 to 1 static compression ratio is probably fine. Less spark advance may be in order to reach mbt, Sounds like a coyote numbers because it basically is less the variable cam timing. Jmho

I wanted to make a post on this topic because:

1: Using my wide band Lambda sensor helped my get 98% of the MAF curve dialed. My fueling is literally within under 2% error anywhere commanded (Lambse) in the base fuel table! (Obviously these results are only as good as my sensors accuracy)

2. More importantly, I had to use the factory narrowband O2 sensors to dial in the bottom 2% of the curve and that improved drivability down low considerably.

3. I hope this post helps someone else out who lacks experience and I am not sure if this is totally correct but has worked well.

I removed the wide band with confidence just to see how she ran and it is even smoother at idle. There is a variance of +4 between the two engine banks under closed loop conditions with the other bank reading 0 on the LTFT.

Is there a recommended value to set man_vol while still working in the LWFM table? I am going to spend some time dialing this VE table in and just want to avoid chasing my tail so to speak…

If cranking spark is null then that leads me to believe that more throttle body bypass mass air may be needed along with some additional enrichment. I will try that out

Does a lower compression engine require more crank spark?

How does crank spark effect crank load?

Okay, I almost forgot about man_vol.

Are there multipliers to transient fueling as well?

Would DPS_FK_IN be one of them?

I’m wondering what to expect with changing them…

Thank you

If I do anything but slowly “roll” into the throttle to crack the throttle plate open slowly when the car is stopped, it wants to hesitate and fall on its face.

Do I need additional acceleration enrichment? How does rzasa control accel enrichment?

I was looking for a function for this but having trouble finding it.