Boost Controler Settings

[dead32]

hey guys im just wondering if someone could correctly explain to me the settings on the profec b spec 2.. boost is obvious however whats teh deal with gain and affecting boost maximum, also theres a setting for wastegate percentage.. please explain

[bubba]

Gain is used to adjust the boost curve if it is creeping or tailing off. You should fiddle with this first to get it to hold a constant boost, then increase the SET value to achieve the boost required. (For instance I was running 25% SET and 11% GAIN to achieve a reasonably solid 12psi). These %'s are dependant on the base boost determined by the actuator, the higher the actuator pressure, the easier it will be to tune the ebc and it will be easier on the actuator and ebc solenoid as neither has to work as hard.

The SET GAIN value is when it opens the waste gate and is set in PSI or kPA depending on which unit you have the controller set to use. Start low with this one, and increase it till it starts to cause spikes then back it off slightly. Essentially what this setting is doing is keeping the wastegate SHUT until a specified pressure, as opposed to the gate slowly opening as pressure builds. I had mine set to 8.5psi on low boost (12psi setting) and 9psi on the high settings (14psi). Hadn't gotten around to fine tuning it anymore. Basically it makes for faster spooling

This was all on my RB20, haven't had the boost controller on with the RB30 but once I get it back from the tuners this afternoon I may have to fine tune the controller again - was having big problems holding boost with the RB25 actuator (6psi instantly and creeping to 12psi by 6000rpm), they put my RB20 actuator on so hopefully it holds boost a little better.

Edited November 1, 2007 by bubba

[nuclear_skyline]

I have the Profec two and bubba has got the tuning downpat! My figures are slightly different thought. More set and less gain

[GeeTR]

I agree, good explanation Bubba!

[Sqd32]

wow, it all seems so simple now lol. cheers bubba