Fuel injection? Open or Closed loop?

cmracing · 03-22-2017, 08:19 PM

You're a 'tweener, which is just fine.

They can probably tolerate 12.1 A/F at the launch, but play-around. See what happens as it approaches 12.5 to 12.8 at the hit. If the 60's don't like it, go the other way.

I imagine you run C11. You can normally go up to 13.0 A/F with that fuel without hurting power. Heck, I have seen up to 14.0 A/F and not hurt the engine, but it did slow down. Again, find out what it likes. Some engines like a flat fuel curve from start to finish, others like to change A/F though the pass. With EFI we are free to experiment with just a few keystrokes!

I have found the higher the octane, the leaner it likes. I have not used oxygenated fuels so I can't speak for tuning them.

View Poll Results: Fuel injection? Do you run in open loop or closed loop
Open Loop	80	65.04%
Closed Loop	43	34.96%
Voters: 123. You may not vote on this poll

03-22-2017, 08:19 PM	#11
cmracing Member Join Date: Aug 2016 Posts: 173 Likes: 113 Liked 62 Times in 29 Posts	Re: Fuel injection? Open or Closed loop? You're a 'tweener, which is just fine. They can probably tolerate 12.1 A/F at the launch, but play-around. See what happens as it approaches 12.5 to 12.8 at the hit. If the 60's don't like it, go the other way. I imagine you run C11. You can normally go up to 13.0 A/F with that fuel without hurting power. Heck, I have seen up to 14.0 A/F and not hurt the engine, but it did slow down. Again, find out what it likes. Some engines like a flat fuel curve from start to finish, others like to change A/F though the pass. With EFI we are free to experiment with just a few keystrokes! I have found the higher the octane, the leaner it likes. I have not used oxygenated fuels so I can't speak for tuning them.