I have have read both pro and con regarding the Apexi PFC's ability (with optional boost solenoid) to control boost effectively with an (HKS 50mm) external wastegate. Bottom line, does it work well or do I have to look for a electronic or manual system. I am only looking to run 12psi and 14psi and want the cockpit control the PFC offered when I ran the twins.

 

As long as you use correctly sized vacuum lines and plumb it correctly it works great. There aren't bells and whistles with it but it controlls boost fine. If you're not trying to boost more than 1 bar then you could get away with finding the Apex AVC-R boost control solenoid. That, and the 3 bar map sensor is all the PFC boost kit is anyway.

..Dave

 

Those boost control solenoids that the AVC-R and the latest Profec use are 12v DC solenoid-operated industrial pnuematic control valves (2-position, 3-way). I don't know the specific model, but I bet they can be bought new for relatively cheap from an industrial supply vendor. Does anyone know what valve they use? I couldn't find a match at mcmaster.com.

-Max

 

Grainger part #6JJ52 and I couldn't find the same thing at McMaster (which the general public can order from).

 

Now that is damned interesting. $25 for a boost control solenoid. I'd be interested to know if this is the exact item and if it's worked for people. The only reference I could find was on a DSM board and they were just using it like a switch to toggle between 2 Manual Boost Controllers. Not a very good indication of how well it would work as a duty-cycle type solenoid.. but worth a few $$ to try it out.

Here's a pic from the Grainger site. You can't order from there but it shouldn't be too difficult to dig one up.

http://www.grainger.com/Grainger/pro...mId=1612667260

 

Found one at mcmaster, not sure that it is the exactly the same: part # 4916K22

Also a slightly cheaper alternative than an Apexi solenoid:
http://www.perrinperformance.com/Pro...ersal/EBCS.htm

Regards,
--Ashraf

 

Thet perrin part looks exactly like the grainger valve but with an anodized base and barbed fittings included.

Either way, someone needs to try one of these.

 

I would be willing to purchase, however, beyond locating a connector to interface with stock wiring harness are there any control issues to be concerned about. Engineer's, need your options.............

 

Upon close examination of specifications, it apears the the max temp range is 32f-125f. Unless it was mounted in the cabin, the temps would be to high mounted under the hood.

 

The grainger valve says 0-180 degrees f. That should be plenty.

 

Not when you "read notes and restrictions" and you look up the part number...
Confusing..........

 

Cut the stock connector and replace with a weatherpak connector. The new valve has a pigtail you would terminate with a weatherpak and you can do the same for the pigtail of the stock connector to revert to it.

I doubt that the temperature range will be an issue.

As for compatability with the ECU, it is an issue. This is definitely DIY engineering territory, as you need to ensure the impedance of the new solenoid is correct and won't burn out the output driver on the ECU you are using. Also, the reaction time of the solenoid and how the ECU drives it may be of concern. Other ECU's have "tweaking" settings for this unlike the PFC (at best, it may tweak to a specified set of parameters if you select the "single turbo" option).

If you want cheap, you have to trade off some sweat - if you want plug and play, you have to trade in some $$$.

Another application would be to use a GM solenoid.

Regards,
--Ashraf