Stock/Built Motor - Boost and Durability - Toyota Yaris Forums

pimp my yaris · 02-12-2012, 02:49 AM

I have heard about two cars with engine failures from running lean now. One from piston rings burning up and now a exhaust valve burnt. I am running 2azfe injectors and a very loud 255lph pump. I am running 11 to 11.5/1 afr at full throttle and its very stable. I cruise at about 13/1afr to keep it rich and running cool. I want to hear the horsepower level that will send one off those tiny stock rods through the side of my block

Has anyone run into this yet? I think I am getting close to the threshold, but not sure. I am amazed how much this thing can handle so far. I said I would leave it at 5psi when I started, but its like a drug. Now I am at 10Psi and thinking about 12 when the weather gets warm again.

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02-12-2012, 02:49 AM	#24
pimp my yaris C'est la vie Drives: 2009 2 door hatchback Join Date: Aug 2009 Location: chicago Posts: 482	I have heard about two cars with engine failures from running lean now. One from piston rings burning up and now a exhaust valve burnt. I am running 2azfe injectors and a very loud 255lph pump. I am running 11 to 11.5/1 afr at full throttle and its very stable. I cruise at about 13/1afr to keep it rich and running cool. I want to hear the horsepower level that will send one off those tiny stock rods through the side of my block Has anyone run into this yet? I think I am getting close to the threshold, but not sure. I am amazed how much this thing can handle so far. I said I would leave it at 5psi when I started, but its like a drug. Now I am at 10Psi and thinking about 12 when the weather gets warm again.