Join Date: Jan 2009
Thanked 64 Times in 60 Posts
It depends on what injectors you run. Honestly I would run a pressure regulating valve instead of an actual "blow off" valve. They are a lot cheaper. I plan on building an intake plenum with 2 built in, so I can run 200hp sticks and not worry about over boosting and blowing my head gasket before I get it o-ringed. Rip Rook sells these valves as "blow off" valves but they only cost about $27 a piece instead of $300 or more. So that is the right that I'm going to go.
also, a quick piece of advice, roll your beads before assembling your intermediate pipe in the charge air system. The rest of that pipe gets in the way of the bead roller if you don't.
As for the external gate part, the stock gate is only 19mm so a 38mm wastegate can flow 4x the volume of the stocker, which should more than adequately reduce drive pressure and slow down the turbine speed for your application. Your top turbo will still be pushing a lot of boost, but thats because it is essentially being fed boosted air as well.
2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.
TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)