Project Toyota Supra MKIV, Part 4: Turbo components



Check out all of that fully back-purged welding!  Even on a jig, PHR reports this is a 40-hour job for their full-time fabricator (which means these guys make little money on this, and the fabricator is probably now blind).  They’re no joke to make, and it’s no wonder why PHR is proud enough to put their stamp on it. It’s a beautiful piece to behold.


A view from underneath.  The S45 manifold features 1.5-in primaries, which is standard on all PHR Stage 4 and Stage 5 turbo kits.  PHR also has an optional “S23” manifold with 1.25-in (ID) runners that it sells with its Stages 1,2 and 3 turbo kits.


While one of the waste gate necks is longer to accommodate fitment, PHR gives it extra strength to prevent cracking over time.


The factory exhaust gaskets line up perfectly.


Another look at the thick flanges and entry points.  You can see some evidence of grinding from PHR in efforts to even further smooth things internally–just more attention to detail.  I've come across several manifolds and headers from other companies that required grinding work to clean up the welds internally.  Thankfully, I didn't have to touch this one.


While the 1.5-in primaries are normally for the big horsepower Supras, MKC and PHR felt this would be the best unit for our application, which is probably more middle-of-the-ground by Supra standards.  And, like I mentioned earlier, I’m a big fan of reduced exhaust back pressure for happier, longer engine life.  I say this without also trying to fall into the “bigger is always better” trap because I also know this is not always true.  But in our case, the S45's 44% flow increase over the S23 should help, and we’ll see on our much anticipated test day.


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