Boost controller question

[incubus2432]

First off I'm happy with the spool of my turbo but a little faster couldn't hurt. My understanding of the RJC boost controller is that you set it at your desired max boost level (the same as the wastegate). I'm at 24lbs with alky. Would there be any issue with setting the RJC at 10lbs so it releases for quicker initial spool then the wastegate takes over for "normal" operation? Does that make sense? I'm not sure I'd like it to be all or nothing as far as boost goes so this seems like a good alternative. Or does the RJC just allow quicker initial buildup but running at partial boost isn't an issue? I hope this jibberish makes sense.......the search function yielded me nothing BTW.

 

[SouthernCal GN]

Manual boost controllers allow for quicker spool, but you don't have further adjustability once you're underway. Electronic controllers give you the scalability to have quick spool, then tailor the boost curve to a desired amount.


Does that help?

 

[incubus2432]

What I'm getting at is can I have the RJC set at 10lbs and the wastegate at 24lbs and would there be any benefits to setting it like this? I'd like to still be able to occasionally run it to just 15 or so pounds (via the throttle pedal....I understand the RJC isn't adjustable on the fly). My "concern" is with the RJC set to 24lbs. would my car essentially run at nothing or 24lbs. with nothing in between? Since the RJC basically holds the boost signal until it is at a predetermined setting when it releases does the actual boost (more or less) instantly shoot to the set level of the RJC? I fully understand why this would be beneficial but I'm not sure if this is ideal for day to day driving in my situation. As always I could be wrong!

 

[RatFink]

Check these boost controllers out. Mucho adjustability
HKS USA EVC Boost Controller

 

[SouthernCal GN]

I have a Greddy Profec available, also- look in the for sale section.

To answer your question- I'm not too sure. I do know that I had a heck of a time with boost spike with the manual controllers i was using, and I'll never go back.

 

[RUQWKNF]

This should help.

Here is my combo as far as turbo and actuator are concerned. TE-60R dbb turbo with an un-ported wastegate hole (.900") standard spring adjustable wastegate actuator, RJC boost controller.
With the WG actuator adjusted with just 1 full turn to give the rod just a little bit of tension, and the RJC valve adjusted almost all the way out,(basically one turn away from coming apart) I have 15psi of rock steady boost. Now, if I tighten the RJC valve all the way in, the boost will go up to 20psi, also rock steady. From here it's only a matter of tightening up the wastegate actuators rod until I reach the boost I want. When I had 27.5psi at the last track visit, the RJC was tightened all the way in and the actuator rod was 7 full turns (14 half turns).
The heavy duty actuator is slightly different as typically one half turn = 1 psi of boost. I have a vacuum line run from the compressor covers brass hose barb to the bottom of the RJC valve, out of the RJC valve into the wastegates hose barb port. Zip ties on all hose connections.
This setup should work on all turbos that have a Stage 3 (T-31) turbine wheel. It's when you step up on turbine wheel size that is larger than this T-31 wheel, is when you have to port the WG hole out larger, to compensate for the extra exhaust flow. With my setup, I can hold 5-10psi at half throttle, but this is not recommended. The valve is simply used to delay the pressure signal from reaching the wg, therefore keeping the puck closed longer and helping to spool up the turbo faster.
HTH

Patrick

 

[BlackBandit]

What you would probably want to do is set the MBC to whatever your minimum desired boost is and then run an in car bleeder to adjust above it. That way you get quick spool of the MBC and you have the ability to adjust above the minimum when the turbo is spooled and you won't notice the wastegate opening so much. It's like a inexpensive version of an electronic controller...without the electronics. :biggrin: I ran an MBC from these guys Products before RJC started selling them and had great success. Rock solid adjustablity from 12 to somewhere. Highest I went was 27 or so but I can't give you an upper limit. Anyway, good info on there site about different setups with MBC's. HTH. james

FWIW with that MBC I never had to tighten my wastegate. I just ran it with "slight tension" and made all adjustments with the controller.