Stock timing map

[Bleu]

I have this picture of the stock timing.

http://i1297.photobucket.com/albums/ag32/Bleu180th/maxtimingmap-95spydervr4_zps05ad729c.gif (http://s1297.photobucket.com/user/Bleu180th/media/maxtimingmap-95spydervr4_zps05ad729c.gif.html)

I can read the RPM, but the load is really arbitrary. I just need to know where it makes the jump to 100 kpa. I'm trying to put together a very mild stockish tune for my standalone and would like to compare the stock map with this low octane map

http://i1297.photobucket.com/albums/ag32/Bleu180th/TIMING_zps4564b407.jpg (http://s1297.photobucket.com/user/Bleu180th/media/TIMING_zps4564b407.jpg.html)

Any help would be nice!

[mjannusch]

Don't look at the top table (from my Spyder) - that's from back when we didn't know much about how the RPM and load axis were set, so the RPM columns are off and the load is somewhat arbitrary. Use the Chrome (stock) tables instead, since the axis values are correct.

Are you looking for 100 kpa in absolute pressure (ie: "0" psi or atmospheric pressure), or 100 kpa of boost (ie: 14.7 psi boost)?

"0 psi" is roughly around 90 load, and "14.7 psi" is roughly around 230 load. Or at least on my car that's where it ends up, but my car is pretty modified with cams and TD05 turbos and other such wackiness. That should be a reasonably safe place to start though. Note that "LOAD" in the stock code does not equal "PSI" - running the same PSI across the rev range will result in more of a curve through a few load ranges. But in the stock ROM, 230 load is well into the range where the timing table just flatlines and repeats the same values all the way to the highest load.

[striker2]

the stock PCM doesnt care about the pressure in the manifold (for fueling) so trying to determine load from a given PSI is useless. generally though somewhere between 90 and 100 load would be 0psiG. above that is boost pressure but larger turbos will flow more air for a given pressure and thus have a higher load from the same pressure.

[Bleu]

I guess I should have been more clear. I'm not using chrome. I'm using a standalone PCM. Its a Link Plus V14. It has a speed density map for kpa vs rpm. I bought it and have a starting timing map and that's it. I was going to compare the stock map and the low octane map and make a combination starter map. I plan on having the top end tuned later but I might even try that too if I can get the fuel dialed in.

I was just curious if the "load" on the stock map could be converted into manifold pressure or not. My best guess was the 12-9 transition in the 500 RPM segment would have been about 100 kpa.