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require full sync for odd cylinder count #4478

This commit is contained in:
rusefillc 2022-08-23 22:58:33 -04:00
parent ecdde2cf6d
commit 42f02c67a3
1 changed files with 7 additions and 0 deletions
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7
firmware/controllers/engine_cycle/main_trigger_callback.cpp
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@ -347,11 +347,18 @@ bool noFiringUntilVvtSync(vvt_mode_e vvtMode) {
if (vvtMode == VVT_MAP_V_TWIN_ANOTHER) {
return true;
}
if (engineConfiguration->isPhaseSyncRequiredForIgnition) {
// in rare cases engines do not like random sequential mode
return true;
}
// Odd cylinder count engines don't work properly with wasted spark, so wait for full sync (so that sequential works)
// See https://github.com/rusefi/rusefi/issues/4195 for the issue to properly support this case
if (engineConfiguration->specs.cylindersCount > 1 && engineConfiguration->specs.cylindersCount % 2 == 1) {
return true;
}
// Symmetrical crank modes require cam sync before firing
// non-symmetrical cranks can use faster spin-up mode (firing in wasted/batch before VVT sync)
// Examples include Nissan MR/VQ, Miata NB, etc