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Boost Controller

muzziak

By muzziak,
in Engines & Forced Induction

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muzziak Collaborator

muzziak

Posted
Posted

Hey guys, so currently I've got a gizzmo EBC installed in the car, but recently got my hands on a greddy profec b spec 2 which is now just lying around. Anyone had experiences with both of these ? I've read good things about both but obviously the greddy is more well known. Just wondering what people's opinions are and if I should just leave the gizzmo and sell greddy and avoid the hassle of installation costs and stuff. Running in a Rb25det r33 skyline, thanks for any feedback

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  • 3 weeks later...
re34perGTT Community Regular

re34perGTT

Posted
Posted

Profecs are the stupidest thing to tune. Warning boost pressure and start boost can be set in psi but actual boost is set in a percentage (face palm). Also what makes it stupider is that apparently it's the percentage of your actuator but if my 34 has a 3psi actuator and it's set at a full 100% higher how does it manage to boost past 6psi? Save yourself the headache and unless you plan on getting your car retuned I'd keep it as is

hardsteppa Grand Master

hardsteppa

Posted
Posted

Its not a percentage of your actuator, its a percentage of duty cycle. Differenet types of cars have different actuators so the base pressure is different for each, a setting that equals 12psi on one would not automatically equal 12 on another. Its just a number, once you understand it its quite easy to work with.

Ben C34 Grand Master

Ben C34

Posted
Posted

I swear I've read somewhere that it had something to do with your actuator. My apologies, but I think the real culprits are greddy for not being able to set your boost in psi

Not many have that option. And even then they don't really work properly.

hardsteppa Grand Master

hardsteppa

Posted
Posted

I think the real culprits are greddy for not being able to set your boost in psi

I agree, curse them for making a simple and effective well-priced boost controller that has been used worldwide successfully on countless cars ;)

Like I said, once you get used to thinking in duty cycle it's easy enough. You should try tuning an avcr including using the gear based option, lot more dicking about there rather than just a couple of settings.

The duty cycle has everything to do with THE actuator, it's just not a straightforward equation to YOUR actuator....you need to figure it out how much percentage duty cycle bleeds boost away from your actuator until you reach the target boost you're after, and then use start-gain and gain to make it come on quick, and then hold the boost level you want. I'll stop now, as this is all 'search results'.

Hadouken Grand Master

Hadouken

Posted
Posted

Profecs are the stupidest thing to tune. Warning boost pressure and start boost can be set in psi but actual boost is set in a percentage (face palm). Also what makes it stupider is that apparently it's the percentage of your actuator but if my 34 has a 3psi actuator and it's set at a full 100% higher how does it manage to boost past 6psi? Save yourself the headache and unless you plan on getting your car retuned I'd keep it as is

My profec was easier to adjust than my old hks evc

I fail to see how this is problem?

  • Like 1
GTSBoy Grand Master

GTSBoy

Posted
Posted

Please explain

I got a Ninja edit in while you were quoting and posting. I snuck in the word "2nd". Such a response would have been a response to the "real culprits are greddy" post and it would have been extremely well thought out and bitingly witty. Sadly I got sidetracked and allowed a lot of others to post and it all would have seemed a little bit late-to-the-party. But I wanted to make sure that people understood that I was all set for a moment of internet glory as a placeholder for the actual glory that didn't eventuate.

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