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Tech Area => General Buick Tech => Topic started by: SuperSix on August 13 2013, 03:14:11 PM

Title: GReddy Profec B Spec II Boost Controllers
Post by: SuperSix on August 13 2013, 03:14:11 PM
Are these good? I am thinking about buying a used one..

http://www.amazon.com/GReddy-15500210-Profec-Boost-Controllers/dp/B000AUMKEY (http://www.amazon.com/GReddy-15500210-Profec-Boost-Controllers/dp/B000AUMKEY)
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: Steve Wood on August 13 2013, 05:47:15 PM
Isn't there something more useful that you could spend the money on?
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: Top Speed on August 13 2013, 06:40:46 PM
I have one.  It works well and very repeatable.  It has a nice max boost recall to see what the peak was.
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: SuperSix on August 14 2013, 07:43:47 AM
Isn't there something more useful that you could spend the money on?

I don't know, that's why I am asking. ;0

I would like to have solid, repeatable boost levels.. Price is 1/2 what I see out there.
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: Steve Wood on August 14 2013, 09:51:51 AM
My boost levels on my cars do exactly the same every time with homemade grainger valve mbc's.  The factory solenoid provided solid boost control.

I have seen more problems with aftermarket wastegates than the factory, but ymmv :)

I would assume you have PowerLogger on your cars but if not, that would be the much better investment.
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: SuperSix on August 14 2013, 12:23:43 PM
My boost levels on my cars do exactly the same every time with homemade grainger valve mbc's.  The factory solenoid provided solid boost control.

I have seen more problems with aftermarket wastegates than the factory, but ymmv :)

I would assume you have PowerLogger on your cars but if not, that would be the much better investment.

Yep - PL and Scanmaster will be installed.

I would like cabin control, and not have to use a compressor valve to do it.
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: Steve Wood on August 14 2013, 12:27:28 PM
I guess if you want to retune the car ever time you change the boost, that is okay.  Might work better with a closed loop wb, but I won't go that route again on a street car.

I am too lazy, I set the boost and leave it there....been years since I moved it off 26 psi on either car.  I never had the performance I wanted out of the regulator valve styles altho others said they worked well for them.  I could seldom make it hit the boost I wanted but rather jumped all round on both sides of my target
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: Top Speed on August 14 2013, 06:45:25 PM
One of the benefits of the GReddy is the ability to adjust the gain so that you can control how quickly the boost comes on.   I tried a variety of manual boost controllers, and in the end, like this one the best.  Of course it is also the one of the most expensive options. 
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: Steve Wood on August 14 2013, 07:02:44 PM
I guess if you want to retune the car ever time you change the boost, that is okay.  Might work better with a closed loop wb, but I won't go that route again on a street car.

I am too lazy, I set the boost and leave it there....been years since I moved it off 26 psi on either car.  I never had the performance I wanted out of the regulator valve styles altho others said they worked well for them.  I could seldom make it hit the boost I wanted but rather jumped all round on both sides of my target

Of course, if you try to change the boost from 20-25, the A/F programmed into the chip will be wrong for one, or the other...
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: Top Speed on August 14 2013, 07:31:59 PM
Exactly.  You don't want to change the boost different than what the chip is designed for.
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: Steve Wood on August 14 2013, 08:20:42 PM
wish I had a car that I had to worry about damping the spool up but I would handle that problem with more traction, I think :D
Title: Re: GReddy Profec B Spec II Boost Controllers
Post by: earlbrown on August 14 2013, 11:38:11 PM
wish I had a car that I had to worry about damping the spool up but I would handle that problem with more traction, I think :D

It's hell having to put up with all those fun filled smokey burnouts and fish tails  :)
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