External wastegate sizeing

[vortecfiero]

my current combo is almost finished and im already planning for the next
chapter. I plan to run a fresh syclone short block, vortec heads and lower
intake mods etc 50 lb injectors yada yada looking for 400 hp safely

they never quote bleed lbs/hr @ pressure ratios etc
all I have ever seen is a dia size ie 28mm.

how do i size an external wastegate to work without trial and error. ?



thanks

 

[DynaGlide]

You're looking for the right flow rate and valve size, right?

TiAL 38mm wastegates are pretty much optimal for our trucks. Anything bigger would be unneccessarily expensive. The higher the boost you want, the more closely to closed the valve will be. Larger gates are larger to bleed off a lot of excess exhaust pressure.

So, if you're wondering which one to get, my advice (which is biased) would be to go with a TiAL 38mm. They're great gates, and very competitively priced... plus, they're 100% American made.