Custom ported and CNC throttle bodies, upper and lower manifolds by Synergy Composite

Sh0velMan

This ECU tends to work contrary to what you would expect. Don't be surprised if it gets richer as airflow increases.

If you get too far outside the expected envelope, in either direction, the car will just start dumping fuel, without throwing any codes or anything.

Example, put a 2.75" intake on the car. Does it go super lean and throw a code/go into limp mode?

Nope, soldiers right along, pegged at 10.5:1 in open loop, sits right in the expected range in closed loop. Clearly uses the MAFs for open loop only, relies almost exclusively on the O2 sensors for closed.


All this is to say, once you do your intake mods, if the car is flowing too much more than the ecu expects, even if it is tracking right on the MAF table, it's probably gonna start dumping fuel until you tune it, so don't expect a lot of gains beyond what you already have when adding parts.

Just my personal experiences and those of close acquaintances, I'm sure there are 10 experts on this site that will disagree.

__________________
Buy My Car! | Build Thread