Sawyer1

Just read on another forum that someone was looking for a 3/8 - 1/2" spacer to put between the exhaust manifold and the turbo. Now what does that do or am I asking another dumb question?

bnold

Could be the spacer for a twins setup maybe??

somis13

the only thing I can think of is an adaptor from the manifold which is called a T-3 flange to fit a bigger turbine housing called a T-4. the reason for this is the choice of A/R is wider. Or you could personal message the original poster and ask em, he might have another reason like he is afraid to drill and tap his cast manifold for a pyrometer probe

Jim Fulmer

I thought I would look around on this site and I see your post so I'll tell you what I know.

Just this last weekend I worked on a 12V that is sitting at 450 hp on #2 (or was) with a stock turbo and a 18.5 housing.....it's been that way for a long time. The problem is he is now towing 26K and you can only imagine how that big of a housing acts. So to cure the issue I went back to a stock 12 housing setting the gate wide open at 32 psi of shop air. I then replace the studs for longer ones and put a 1/2" spacer (T3) between the manifold and housing. This allows you to vent or gate all 6 cylinders when the gate opens, you can only imagine what the boost would be with that much fuel....50+ but with this setup and ripping through the gears it held at 33 psi from 4th on, 3rd netted about 26-28. The proof will be this weekend when he tows once again to the races on the east coast.

Downside of this setup is in time the part of the housing that is between the vlutes (sp) will erode, not in chucks but a tiny bit over time.

Jim

Radcam

I think you are talking about my post on the other sight. And the reason I need a spacer is that I flipped the exhaust manifold over for a little more clearance between the turbo and ac/heater box in my truck, but with the turbo now on top I couldn't clock the compressor housing to point down with out a spacer. I ended up making a spacer and everything looks good to go. You can see picks of the turbo sitting on top of the manifold in my webshots pics but I don't have one of the spacer in there yet.

Cam

gunracer1

i have swaped out many turbos and i still think the best set up to tow with is a hx35. but i do like the 14cm wastegated exhaust housing.