Miata Turbo Forum - Boost cars, acquire cats. - Tuning N/A engine on 87 octane: Has anyone even bothered?

Quote:

Originally Posted by Braineack (Post 720455)

Would you be a dear and take note of how the timing changes at idle/load when the a/c is turned on?

I use two timing maps, one with a/c activation and would like to see what the factory ECU does.

Finally had a chance to get out there and do some more test driving. The spark map seems to not be quite as tightly synchronized with the OBD2 when the AC is on full blast (as opposed to not being on at all), but it generally still follows the same readings as I get from the OBD2. So I'm thinking that my most recently posted spark map is a pretty good emulation of the OEM OBD2 for 96-97 Miatas.