Fuel Injection / Timing Map Tuning Question

[EclecticRedneck]

I am new to the forum.  Thanks in advance for your help and for letting me play along.

I'm working on a 428CJ (now a 462) with an Edelbrock ProFlo2 fuel injection system that I built about 4 years ago.  I have a wide band O2 sensor, Ethanol Meter and Knock Sensor on board so I have nailed down the fuel ratios pretty close but I have no idea what to do with the spark map.  The base maps from Edelbrock are for a much milder and smaller motor so I am sure they are not optimum - nor does it run as strong as I think it should.

Does anyone have a spark map that is working well on a similar motor or can you point me in the right direction?

I'm not sure if this is way too much information or not nearly enough - but this is what I built.

- 69 Mach 1, Q code, 428SCJ
- 0.030 over with a SCAT rotating assembly to make 462 cubic inches
- Static Compression Ratio = 11.77
- Dynamic Compression Ratio = 8.26
- Quench Height = 0.038"
- Aluminum Edelbrock 60069 Heads
     - Combustion Chamber Volume = 72cc
     - Intake Runner Volume = 177cc
     - Valve Size Intake / Exhaust = 2.090 / 1.660
- Comp Cams Hydraulic Roller
     - Duration @0.050" Intake / Exhaust = 234 / 240
     - Advertised Duration @ 0.006 = 287 / 293
     - Gross Lift = 0.594 / 0.598
     - 112° Lobe SEparation Angle
     - Installed at 110° intake centerline
- Hooker Supercomp Headers
     - 1-7/8" Tube Diameter
     - 36" Tube Length
- 3" Dual Exhaust all the way back
- Flowmaster Mufflers (forgot the part number...)


I live at 5200 ft elevation and run 91 octane if I have to but typically mix with E85 to about 30% ethanol.

I know the right answer is take it to a speed shop and have it dyno tuned and some day I will - not least because I want to know how much power it's actually making. But time, money and proximity make that tough so any help you can provide would be greatly appreciated.

Thanks in advance!

[jayb]

On page 3 of the thread below, about 3/4 of the way down the page there is a screen shot of the timing table I used on my 504" dyno mule.  It may not be perfect for your application but it would be a good start.  Rather than 20 degrees initial, you might try 16 degrees and modify from there.  This timing map is not really optimized for fuel economy; under high MAP conditions and cruise speeds you could probably add quite a bit of timing over what is shown in the table.  But since this was a dyno engine I didn't worry about that.  Hope this helps - Jay

http://fepower.net/simplemachinesforum/index.php?topic=4760.0

[EclecticRedneck]

Thank You!  This is perfect and I really appreciate it.