With first exhaust pipe under the engine from 63,5 mm, the central pipe from 60 mm, the rest of pipe stock and the free flow fake back silencer I had 880°C in 4° gear @ 5000 rpm and 930°C in 5° gear @ 5000 rpm. Then with the central pipe from 63,5 mm I had 850°C in 4° gear @ 5000 rpm and 905°C in 5° gear @ 5000 rpm. Now I'm ready to fit the complete free flow exhaust without any restriction, all from 63,5 mm and I'll see how much EGT I'll have.
Thanks, this is very valuable information!
Just to be sure, starting at the turbo:
So, first you had 1-3 in 63.5mm and 4-5 in 60mm.
Then you changed 4 also in 63.5mm and EGT is 30 deg lower.
I'm suspecting my exhaust more and more for the high EGT that I have.
The Ragazzon central GTA pipe that I have is 60mm outside, but internally it is made smaller at the ends of the silencer. It could be 50-55mm internal.
Maybe I cut the silencer out, or have the complete pipe made in 63.5mm.
The relative turbo pressure is set at 2000 mbar all the way up 2500 to 4500 rpm till 1850 mbar at 5000 rpm. The injection is set to 100 mm3 all the way from 2000 to 5000 rpm.
Ok, then you'll probably have some smoke past 4500 rpm.
I my case injection is ramped down more past that rpm, but I maintain good power up to 4700 rpm.