PeachParts Mercedes-Benz Forum - View Single Post

duxthe1 · #17 11-29-2018, 11:26 PM

I've been working at the details over the last several evenings. I got around to re-welding the downpipe v-band flange. Post turbo leak won't affect the spool but its good to have the biggest exhasut leak fixed. I pulled the diverter and welded it shut. The old oring sealing it to the head was poor so that got replaced too. I've got an egr valve, for show for emissions, but its plumbing had a small leak too.

While fixing exhaust leaks I decided to make an adaptor to pressurize the entire intake to check for boost leaks. Found and fixed a few small things, but nothing was a smoking gun for the slow spool.

This just leaves the exhaust manifold itself. It is warped by the #4 runner and it has a crack between 2 and 3. I priced a new one today, it isn't as bad as I was suspecting, but its significant and the holidays are impending. I didn't check availability when pricing the part. Hopefully they are actually still available.

So after getting all of the easily fixable leaks remedied and playing with the boost control solenoid settings I have hit 13.5 PSI. At that pressure, its healthy. Once boost control kicks in, it can't hold. Too much pre-turbo leak and as it tries to modulate the wastegate it loses its head of steam and falls back to wastegate pressure ~8-9 PSI. Even then it aint slow, but I feel there is still plenty being left on the table.