Spark advance tables

[myredprky]

Help ??????? Can anyone please expalain why with a carb and dizzy setup the ignition timing will go to around 32-36 deg of total advance with a wide open throttle but with tpi (1227730 ecm) the total advance when the kpa values rise is taken down to around 20 deg???? .I am mapping out my ve tables but have noticed that the power drops off as the timming drops off,I have more power by lifting the throttle and bringing down the kpa,s.....?

engine is
350 sbc
with Edelbrock heads
10-1 compression
comp cams with 220\230\@50
Accel manifold base
ASM runners and ported plenum
Headman hedders
and 52mm throttle body.

I am hopping to get around 400hp from this setup (would that seem right to you guys)
Do I need to give it a lot more timing at the top end of the kpa vs spark map ????

many thanks IAN....

[gregs78cam]

From that short parts list I would say 400hp sounds very possible from this setup. And as long as you have a good functioning knock sensor in it, sure, add some timing and see what it likes.

[EagleMark]

Stock OEM carb and distributor curves were close to EFI for idle and acceleration. Just like a carb and dizzy setup with built motor you can add timing.

Just sneak up on max timing. There are so many varibles in ECM/Chip and EAT module that your Main Spark Advance will probably not be actual! Check timing with timing light at timing marks at various RPM and see where your timing really is compared to bin or ALDL spark timing data if you have it. Totally warmed up, 3000 RPM and pinch MAP line to cause 100 MAP, get timing, is a good test.

[myburb]

I too would be interested in opinions on the question. As OP said, in early days full throttle 36 degrees, no knock sensor and all was good. Now with efi any time you get rpm and load the timing is 20 degrees and less. Are they worried about making too much power? Are they worried about their warranties? Are they worried about weak transmissions? What do you think the answer is?

[EagleMark]

Emissions.

[myredprky]

Thanks guys,,just made a vast improvement by looking into my Enrich Power Spark Advance Vs. RPM table to find it had all been zerod out.I copied over the tables from an super AUJP bin and thats made a big differance in pulling power...But I rekon I should be looking for 32 full advance in wot at 3000 rpm on but my spark map just wont allow it....
the spark table I have is shown below.....
Attachment 2881

should I be going for somthing like this in the 100 kpa range.....?????

IMG_1857.jpg