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Old 02-22-2013, 03:50 PM   #1
47_MasoN_47
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Ok.

I haven't measured my AFR at WOT. Is that the only position where it really matters? I was just thinking that it seems like under normal conditions the ECU would probably maintain that 14.7 AFR even with the stock airbox during normal conditions. It would make sense that under WOT I could be lean (since that's what I was doing when I got the lean code that one time) but for the most part it seems like it would be ok where it is?

Just trying to clarify. The car seems to be running fine. I turned the boost off for the time being (jesus these cars are slow without boost, I forgot what that's even like) and am going to get my fiance to help me with the compression test tonight.
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Old 02-22-2013, 04:02 PM   #2
CTScott
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Quote:
Originally Posted by 47_MasoN_47 View Post
Ok.

I haven't measured my AFR at WOT. Is that the only position where it really matters? I was just thinking that it seems like under normal conditions the ECU would probably maintain that 14.7 AFR even with the stock airbox during normal conditions. It would make sense that under WOT I could be lean (since that's what I was doing when I got the lean code that one time) but for the most part it seems like it would be ok where it is?

Just trying to clarify. The car seems to be running fine. I turned the boost off for the time being (jesus these cars are slow without boost, I forgot what that's even like) and am going to get my fiance to help me with the compression test tonight.
You are concerned about AFR anytime the needle moves out of the vacuum range and into the boost range. The AFR should decrease proportionally as boost increases. I seldom go near WOT, but at max boost (6 psi) I run about 12. As soon as I cross zero into boost range I see the AFR decrease to about 14.3, and then by 3 psi I am down to about 13.6.
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