I was looking into building a blow through carb for my son and have seen how to modify the carb for a boost reference power valve which makes the power valve work by boost and not vacuum. But I cant find anywhere to get the boost reference power valve so I was wondering if anyone knows where to get one ? Thanks, Ron

Kevin at CSU.........

Thanks Thumper. Would you know the phone # by any chance ? Thanks again , Ron

There used to be artlicles out there on how to make one out of a regular power valve. I know a friend of mine and I converted a carb for boost and did not use a boost referenced PV. The car had great drive ability at low throttle, and it ran good wide open. Everything in between was horrible lol. I am sure a boost reference PV would have taken care of that.

google hangar 18 mod too for ideas

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Beat me to it...........

It's better, but not EFI.
You now have 2 A:F setting: NA and boost. It gives the same enrichment at the opening pressure of the PCV as the maximum boost - but obviously full boost requires more fuel since by definition a carburetor does not sense a change in air density, only in air speed. Some part of the fuel curve is compromised. For a race car the difference may not matter - the mains give NA mix and the PCV adds whatever you need for full boost. For a street car this is more difficult.
What would be nice: a second boost-referenced PCV, even if it's an external circuit-in-a-box. A Snow or similar could inject race gas (to keep it legal) proportionate to boost, but $400...
You can get closer if your ignition allows proportionate retard on boost, but I'm guessing that most blow-through are normal ignition.

I can't say how the CSU version works, but the one I have from Horsepowerinnovation is linear to boost. It's not just on/off based on boost.

It has a piston and spring which is overcome by increasing fuel pressure, a pair of transfer slots meter the fuel based on boost psi.

Works fairly well...its A LOT better then just a stock power valve setup.

linear to boost

Sounds good!

Thanks for the replies guys as I appreciate it. Ron

Dizuster would you mind if I could call you and talk to you about the type you use ? Or you can call me when you have time if you don't mind. If you don't get me just leave a message if you don't mind calling and if you do I understand. My phone # is 443-904-7898 or you could PM me your #. I tried to PM you but it said it full. Thanks , Ron

Ron, if you want to try an Edelbrock carb they are pretty easy to modify and one off eBay can be had pretty cheaply.
You have to drill and tap the top of the carb to boost reference each float bowl. Also I take the floats and with a soldering iron remove the float mounts. Buy a set of Thermoquad floats cut the float mounts off and solder the Edelbrock mounts on.
As far as jetting goes set the primaries as you would a naturally aspirated motor. For the secondaries, the down and dirty method is to remove the jets. The