Calibrating the 2.4 running stock electronics

[Dohc Rocks]

Wow that first map is extremely conservative....

I was expecting to see a lot more timing in cruise.

[Aries_Turbo]

yeah, thats jt's. he has been running super safe timing for years. and his car flies. i guess we dont need to go balls to the wall all the time with timing. im sure it helps keep his motor/headgasket together when pushing a not-so-light car deep into the 10's .

Brian

[turbo84voyager]

Can someone recommend documentation or explain how to read the timing tables listed above? I dont understand the ignition load. How does the timing table reference boost / vacuum? I am sure it is easy to read but for some reason I cant get it. I am used to working with the tables in D-cal where there is the timing tables and the one that simulates the mechanical advance. I have some experience modifying our cals especially the 2.5 G head cal and I would like to start working on a 2.4 cal and or Brian if you are interested ill give you a hand with it.

Thanks,

Justin

[turbo84voyager]

I am a complete idiot. After looking at the tables a 1/2 dozen times i realized what I was looking at. I forgot the kPa calculation. I threw together a spreadsheet to convert it and now it makes perfect sense. I am going to try to convert these over as best as I can. I can't guarantee I will get it right but I will try. If anyone would like to help or have any suggestions, let me kow.

[turbo84voyager]

Attached is my first version of the 2.4 dished piston cal based on DJ's 91 octane timing. I only made changes to the timing tables. I also matched the knock voltage table to the posted 2.4 cal. I DID NOT do anything to the fuel or even scale it for the injectors. My goal was to match the timing as close as possible. Most of the changes were in the Part throttle / full throttle timing tables and the RPM timing (governor). The lines look a little strange but when I compare the calculated timing in D-cal the tables almost exactly match DJ's. From going over it several times the numbers that don't match are off by about 1 degree except for a few of the timing numbers which you will never see, for example 20 psi at 1500 rpm. I have a copy of one of Sean's cals that Brian worked on and I would like to use the fuel tables from it but I would like permission to do it first. Take a look at it and let me know what you think. If you see anything that catches you eye please let me know. I have been looking at these numbers for several hours so it is possible there is a mistake I missed. Hopefully this will be a good start to getting a 2.4 dished piston cal. I also think the finished cal would be a good base cal for a 2.5 hybrid. Thanks again to DJ and JT for allowing Brian to post your timing tables! Also attached is the XLS file with the kPa conversion.

[turbo84voyager]

I found an error in the timing in vacuum. When looking at the table last night I looked at a few of the negative values as inHg not PSI by accident. I fixed the changes and got the timing as close as I can to the table.