Running too lean?
Hey guys,
Any clue how I can tell if I'm running too lean? Is it normal to have some black soot on the exhaust tip? Just wondering if this is caused by running too lean. Thanks! |
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Did some searching on Google and people are recommending to solve the issue with running too rich I should replace the spark plugs. Think this would do it? |
Did some more searching and people on the forum are saying it's normal for the 370z to run rich. Guess I'm stuck with the dirty exhaust tip.
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:ninja3:
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I've noticed this same problem ever since I installed my HFCs a month ago. I never used to have the black soot on my exhaust tips before when I just had my CBE and intakes. I guess I'm running too rich with all my mods.
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Oh I don't have any CATS on could this be a factor as well? I plan to get CATS on the exhaust system, feel bad polluting more then I have to |
I have some black residue on my stock exhaust. Car is completely stock for now. Maybe it won't happen when I get my CBE.
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You need to run a spark plug chop test and actually look at the base of the spark plug insulator with a magnifying glass. If it's really dark brown or black you're running rich. If it's really light tan, light gray or chalky white you're lean. What you're looking for is; a medium to dark tan. You can install a A/F Gauge but it's readings are more relative to the climatic conditions. If your running an intake, headers, test pipes or HFC's, cat back and improved intake manifold you might be a tad lean, possibly. If not, there's no way the ECU will allow a lean condition. Another way to tell is to pick a specific gear 2nd-4th, hold a specific RPM at around 3700-4000 and see if the Z surges slightly. You'll know exactly what I mean if you feel it. If it does, then it could be an indicator of running lean. You will also develop a lean "POP" under deceleration in every gear but will be progressively louder under higher rpm load in lower gears. |
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Soot can deposit on the tips and bumper even if the engine is running lean. And yes, running rich will make more soot but its not all about the A/F ratio, combustion efficiency is why its still an issue with lean running engines. The reason there is soot is because of incomplete combustion. Even if run lean, not all of the gasoline is completely reacted with the oxygen. The partially oxidized gasoline creates carbonacious particles or soot. This is where the stock catalytic converters do their job of cleaning up the exhaust flow stream. The stock cats "catalyses" the remainder of unreacted gasoline and force it to react with any remaining free oxygen to form water vapor and carbon dioxide. Both of which are much better in terms of cleanliness. In the case of the 370Z engine, it won't allow the A/F to go to any extreme for very long. The objective of the ECU and stock cats is to burn all the fuel. Between the ECU and the stock cats very little soot is emitted. But once test pipes, ART pipes or HFC's are used, some soot will make it through. The best that can be done is to tune it on the slightly lean side of optimum and go with it. |
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