GT17 too small? - Toyota Yaris Forums

CDavis7M · 06-10-2009, 02:05 AM

I don't have any experience with a Yaris, let alone a turbo one. But, I do have a turbo supra.

Here are some of the basics that I know about Turbo cars. Please let me know if I am wrong though.
-A car with a Turbo stock will have an ECU that is set to retard timing at higher rpm / higher boost.
-Turbo cars have much lower engine compression and are better able to handle boost.
-NA cars try to achieve a Air/Fuel Ratio of about 14.7, probably richer than that at about 13-14 or less when at full throttle.
-A Turbo cars ECU is set to run at 11-12 AFR at full throttle. Running richer allows the gas to cool the piston and reduces the risk of detonation.
-Turbo cars usually have some or all of the rotating assembly forged.

So, basically, running a turbo without any modifications on an economy engine, you will detonate with AFRs around 14, even at 7psi. I hope someone before me set you guys straight but this thread looks like Honda Tech. It's just horrible.

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06-10-2009, 02:05 AM	#11
CDavis7M Drives: 1990 Supra Turbo Join Date: May 2009 Location: San Diego Posts: 46	I don't have any experience with a Yaris, let alone a turbo one. But, I do have a turbo supra. Here are some of the basics that I know about Turbo cars. Please let me know if I am wrong though. -A car with a Turbo stock will have an ECU that is set to retard timing at higher rpm / higher boost. -Turbo cars have much lower engine compression and are better able to handle boost. -NA cars try to achieve a Air/Fuel Ratio of about 14.7, probably richer than that at about 13-14 or less when at full throttle. -A Turbo cars ECU is set to run at 11-12 AFR at full throttle. Running richer allows the gas to cool the piston and reduces the risk of detonation. -Turbo cars usually have some or all of the rotating assembly forged. So, basically, running a turbo without any modifications on an economy engine, you will detonate with AFRs around 14, even at 7psi. I hope someone before me set you guys straight but this thread looks like Honda Tech. It's just horrible.