DesmoBro said:whoa are you really swan's Maa?
nah, I just hooked it up there quick for the time being. I still have not decided on the final location for the gauge, i'll have to come up with something.Rich Ard said:I dig the looped oil line - but it strikes me that it's an accident waiting to happen. Do you plan to leave it hanging out like it is now?
Mike Lawless said:In my opinion, a draw through is compromise anyway. It is the least expensive way to go, which is why it's popular in the air cooled VW world.
nope, most of the welding is mig. The downpipe had a funky coating on it that made the weld splatter kinda weird.SONIC. said:Are you doing the welding with a torch?
the wastegate on it opens around 6psi, so I'm gonna start with that.mlinder said:You've probably said somewhere already, but how much boost are you running?
constructive criticism appreciated! A plenum would have been a whole lot easier to make. The main reason I did it the way I did was to avoid fuel puddling like sonreir is talking about, but it does make sense that the heat from the cylinder head would take care of this. I was also worried that the plenum would favor either the two center cylinders, or the two outer ones. After seeing so many more manifolds constructed this way, is must not be a big issue either.Mike Lawless said:Your intake would function much better as a "plenum" style.
Are you refering to piston-ring style vs. carbon seals? the carbon seal is what you are supposed to have for draw through. This turbo currently has piston-ring type seals. These don't always work with draw through, because when the throttle is closed at high rpm you get lots of intake vacuum. this vacuum sucks oil through the ring gap in the piston-ring type seal, and oil enters the intake. I'm taking the "run it and lets see what happens" approach before I do anything about it. Might be fine, might burn a little oil, or it might smoke like a freight train and foul the plugs constantly.Mike Lawless said:You also need to make sure the turbo is designed for a draw thru application and has internal shaft seals between the hot side and the cold side.
Mike Lawless said:All that really matters is that you have fun with it. Even at 6PSI the thing is gonna make a bunch more power. As an example, my air cooled VW drag racer dyno'd at 260hp, normally aspirated with 14-1 compression out of 2.3 litres. Ran 11.30 at 118 in the quarter as a full weight street car. Add a fairly modest turbo (blow thru) and drop the compression down to 10-1, and the thing makes close to 500hp and ran 9.85 at 143mph in it's last outing at 15 psi. At 7psi, it made around 400hp and ran low 10s.
Besides, maybe the plenum style intake could be a project for another day once you get this version scienced out.
So, RUN IT!!