Guppy, thats exactly what I am suggesting but reusing the BOV as this valve. You would program it to hold the maximum boost before it surged until you had enough volume flow to cope with more. Which is what I'll do with the autronic.

Zac, I was just being silly. 620hp odd is enough for now.

Richard, you know the answer to that question. Depends on powerband requirements mainly. If you like so many people and seem to have little faith in your ability to keep revs up above 2800-3000 on the track (which isn't that hard a task really) then I'd say its too big. GT35Rs have made 530rwhp so it'll meet your power requirements and yet have very nice response IMHO. Go for it.

If you can get to Melbourne in the next month you're welcome to have a drive of mine to get an idea?

Dave

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USA Daily: 2014 Nissan GT-R, very minor modifications for the track
USA Project: 1978 280Z, minor suspension upgrades, VK56DE conversion in progress. SOLD
AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. SOLD
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild. SOLD

Your'e the one with the hands on GT35R experience Dave, what you have said about it has been very helpful. So, yeh, looks like a GT35R for my V6 project engine, aiming for ~500whp and plenty of mid range.

Thanks for the drive offer, have to save $ at the moment unfortunately

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Richard... http://www.youtube.com/watch?v=rqM9_Wq-TKc