E92 ecm. Doing vve tuning, maf disabled, 02s disabled.
When the engine is warm the vve error ratio is within 2-3%, fueling is good. When the engine is cold (30* F), the eq error is upwards of 20% for the vve table. Commanded fuel is lean (near stoich), wb reads lean, about 1.5 lambda.
So I figured since I'm forcing OL that the best way to do cold enrichment is to bump up the cold values in the OL eq ratio min vs ECT table (Fuel<OL base<Eq ratio min). It did command a richer afr (about .70 lambda) and now the wideband is about .85 lambda. Buuuut the vve table still had a 20% error ratio.
Obviously I plan on eventually enabling the 02s, CL, and Dynamic, but for the time being I'm working on the VVE.
Questions:
1. Is this the correct way to enrich cold starts in OL and SD?
2. Why didn't my vve error drop when I changed the OL eq ratio vs ect?
3. Is it normal for the vve error to be sky high when the engine is cold vs warm?
HALP.