Hey,

I don't like my high EGT, the prob is in the 4th runner of my tubular manifold, very close to the engine port.

I get 800C~ at cruise @ 100kph~ @ 40deg of timing, when I stop to check I can see the manifold+turbine is red hot.

I was running 16afr and then dropped it to 14 just to check, the egt went down a little (700-750C) but was hitting 800C sometimes still...

My idle EGT is 500-600C (normal ?)

When I disconnect the wastgate actuator and run with no boost, I still get the same cruise EGT as before...

Could be the manifold design is the cause and that is that ?

Thanks !

 

Leaner is usually hotter. With a 16afr, you may need to run even more timing than 40 at cruise to have a complete burn before the exhaust leaves the head. It is also a bit dangerous to run lean because it is possible to melt pistons at lean cruise or to have them gall the cylinder walls. Just be careful.