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Discussion Starter · #1 ·
I would like to know the normal oil pressure of Evolution IV. When Idle, the oil pressure is slightly below 1 kg/cm2 and when cruising, it's around 4-5 kg/cm2 and the respond of the rise of the oil pressure when open up throttle is quick enough. Is that a problem to the engine ?

I've installed Apexi Auto Timer with o2 and air fuel mixture monitor and I found that when the turbo start to work. The air fuel mixture always below 10:1. What's going on ?
 
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Discussion Starter · #2 ·
A/f mixture of Evo is rich all the way. This is normal, but I can't quote you a specific figure on what the normal a/f mix ratio is.

If it bothers you that you get poor fuel mileage, install an Apex'i AFC so you can tune the a/f mix through 5 or 7 specific RPM bands. You can set it closer to stoich @ sub-boost operation then leave the rest of the a/f mix at OEM specs at boost operation. I'll be doing the same soon.
 
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Discussion Starter · #4 ·
I don't think a car with A/F ratio around 10 is normal. Tuning by SAFC is one way to solve this problem but I think that's some problem on my car and need to be fixed first.
 
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Discussion Starter · #5 ·
I don't think a car with A/F ratio around 10 is normal. Tuning by SAFC is one way to solve this problem but I think that's some problem on my car and need to be fixed first.
 
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