patman
5+ Year Contributor
- 107
- 61
- Oct 19, 2017
-
Budapest,
Europe
Hi guys!
After a year of driving I pulled the exhaust manifold to add some heat shielding. Meanwhile I checked the valves and noticed a slight black buildup on the exhaust valves. I doesn't seem serious, but i think the combustion is not perfect, here is the best pic I could take:
I am running a stock T25 turbo (with stock boost), EVO 8 pistons and ECMlink, and some smaller modifications. My target AFR for WOT is 10.9-11.2 I have WBO2 so I can check it, and it's there on full boost. Should I give it a little more fuel, or is it already running a little too rich? Or should I just ignore the small buildup, it is normal after one year?
Thank you for the help!
After a year of driving I pulled the exhaust manifold to add some heat shielding. Meanwhile I checked the valves and noticed a slight black buildup on the exhaust valves. I doesn't seem serious, but i think the combustion is not perfect, here is the best pic I could take:
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I am running a stock T25 turbo (with stock boost), EVO 8 pistons and ECMlink, and some smaller modifications. My target AFR for WOT is 10.9-11.2 I have WBO2 so I can check it, and it's there on full boost. Should I give it a little more fuel, or is it already running a little too rich? Or should I just ignore the small buildup, it is normal after one year?
Thank you for the help!
