Has anybody here done it extensively? I it only did a little bit to get AFR's right, with the previous 7.8:1 engine.
What I am wondering specifically is what kind of timing and fuel requirements you found ideal for power in these very low load areas used during lean cruise. Given a VG, and level of modification obviously yielding VE (eV) changes that need to be compensated for I can't expect a little variance here.
For example: I run 50 degrees at lean cruise with an actual closed-loop AFR reading between 14.7-15.0 using my LM-1 (which is now working, but only until I step on the gas, then it flakes out again). What's nice about this running condition is the staggering gain I saw in fuel economy. I literally got 2mpg better fuel economy, up to an average of 28 from the previous 26 highway.
What's not so nice is the transient enrichment; the next load column does not seem to take effect until the exhaust-measured AFR is already heading lean. This is regardless of what the TP setting is in that load column. This means I'm losing response from not getting that acceleration enrichment (or accel-pump-like action). I will also occasionally get a very slight miss. POT TPS systems are nice for situations like that. I wonder if there would be a way to incorporate it into the program using NisTune?
What I am wondering specifically is what kind of timing and fuel requirements you found ideal for power in these very low load areas used during lean cruise. Given a VG, and level of modification obviously yielding VE (eV) changes that need to be compensated for I can't expect a little variance here.
For example: I run 50 degrees at lean cruise with an actual closed-loop AFR reading between 14.7-15.0 using my LM-1 (which is now working, but only until I step on the gas, then it flakes out again). What's nice about this running condition is the staggering gain I saw in fuel economy. I literally got 2mpg better fuel economy, up to an average of 28 from the previous 26 highway.
What's not so nice is the transient enrichment; the next load column does not seem to take effect until the exhaust-measured AFR is already heading lean. This is regardless of what the TP setting is in that load column. This means I'm losing response from not getting that acceleration enrichment (or accel-pump-like action). I will also occasionally get a very slight miss. POT TPS systems are nice for situations like that. I wonder if there would be a way to incorporate it into the program using NisTune?
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