Quote:
Originally Posted by brucepick
nbleak21,
Ahh, Lean Burn Honda powered cars. I spent quite a bit of time figuring mine out.
Mine had a requirement of about 63 mph or better (in fifth gear) for lean burn. That was a minimum of about 2300-2400 rpm. Interstate upgrades would defeat lean burn due to speed lost while climbing.
I use a ScanGauge to monitor engine status: Lean Burn status, load, temperatures. Do you have one?
And I discovered - after 2.5 years of lean burn frustration - that 2 ounces of Marvel Mystery Oil per ten gallons gas enables lean burn down to about 1900 rpm, or about 45-46 mph in fifth gear in my car.
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I am actually artificially forcing Lean Burn on a non-lean burn engine (F22b1) using a VAFC. How I've done this:
-Vtec Engagement has been dropped down to 2250rpms
-TPS < 16% (relative) at 2200-2950rpms is adjusted to 50% fuel reduction
I also use the Torque App (for android devices) to monitor my parameters.
I did recently pick up a couple bottles of MMO and I plan to run some through it as well.
Ecky, Thanks for your post as well... quite a difference in the no-load GPH for two honda engines!