Join Date: Dec 2018
Location: Los Angeles (Carson) CA
Mentioned: 7 Post(s)
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From the kit description. Confirms what we all know now to be true:
From the factory, the VR30DDTT has no method of compensating for compressor surge, which means excess boost pressure is forced against the compressor wheel, this can accelerate wear on the turbocharger. For stock boost levels, Nissan has apparently deemed this to be acceptable for the life of the car, but once you crank up the boost, it's only going to get worse. While we would like to point out that some factors in the VR30's design mean that not ALL of the excess boost pressure will be bled off, we do strongly believe that adding BOVs will help extend the life of the turbos, on both stock and modified cars.
CZP released their own version of the HKS SSQV BOV kit. Current price $595, but I think they will price match?
Noted that Z1's kit for our cars are $648.
I haven't compared kits in detail or called either company to inquire, but I wonder what the differences, if any, might be?
I know I also want to divert/recirc in my application.
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I assume people have seen this:
There's a coupler kit to add whatever BOV's you want for MUCH cheaper. $600 is outrageous for a BOV kit.
I've been doing boosted stuff for a long time, at higher HP levels than the VR30DDTT, and there's a bit of a golden rule on BOV's vs. wastegates. Put all your money in wastegates, because if they fail you risk overboosting and blowing the motor. Cheaping out on a BOV which simply vents air will not cost you a motor if it fails, especially on a platform that wasn't designed with a BOV or diverter valve from the factory. I wouldn't hesitate to put $40 BOV's on this motor, which would put you at a total of ~$200 for a kit.
I was going to do the BOV's until I read up a bit about how the VR30DDTT avoids the use of BOV's. Even at higher boost I don't think it'll hurt the turbo's because A) the wastegates stay open after you let off the throttle. This avoids the "push from both directions" i.e. exhaust pushing and the boost in the intake pushing against the shaft of the turbo. And B) the ECU keeps the throttle open slightly to vent some of this pressure after you let off the throttle.