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Greddy Profec boost controller (HELP NEEDED)

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Old Sep 27, 2009 | 09:00 AM
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Default Greddy Profec boost controller (HELP NEEDED)

Im running the APS kit on my 2002 corvette.

My low boost setting is programed for 9 psi and it reaches that no problem. When I switch it to high boost, which is supposed to be 14psi, it only reaches 10 psi.

I was scrolling through the options yesterday and noticed that the high boost is set on 45% , and Im guessing its 45% of the wastegate springs????

What Im trying to do is get it back up to 14 psi where it was tuned at. Is it as simple as turning the % up until my desired boost is reached on a hard run?
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Old Sep 27, 2009 | 12:58 PM
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Originally Posted by 02blackbeauty19
Im running the APS kit on my 2002 corvette.

My low boost setting is programed for 9 psi and it reaches that no problem. When I switch it to high boost, which is supposed to be 14psi, it only reaches 10 psi.

I was scrolling through the options yesterday and noticed that the high boost is set on 45% , and Im guessing its 45% of the wastegate springs????

What Im trying to do is get it back up to 14 psi where it was tuned at. Is it as simple as turning the % up until my desired boost is reached on a hard run?
It is just 45% bleed of the air passing through the control circuit. So in some respects a random number as there are other variables.

And yes, it is s simple as increasing this.
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Old Sep 27, 2009 | 02:42 PM
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Originally Posted by stevieturbo
It is just 45% bleed of the air passing through the control circuit. So in some respects a random number as there are other variables.

And yes, it is s simple as increasing this.
Is there a certain increment in % I should increase it at so I dont over-boost it or take all day testing it LOL
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Old Sep 27, 2009 | 02:53 PM
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Trial and error. And its not as if its difficult. It should only take a minute or two.
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Old Sep 27, 2009 | 03:08 PM
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Originally Posted by stevieturbo
Trial and error. And its not as if its difficult. It should only take a minute or two.
Ok, thanks a lot man. Ill probably go out during half-time of the Saints game and get her dialed in. Ill report back
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Old Sep 28, 2009 | 01:05 AM
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to prevent to much boost set the max to 14 psi. (if it's a spec b it has this feature), then like stated increase the percent.
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Old Sep 28, 2009 | 10:50 AM
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if this is for the profec bspec II sent me an email this evening at cscharlt[at] gmail dot com and I'll see if I can find a great guide i found.
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Old Sep 28, 2009 | 08:01 PM
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Hey guys, I still havent got around to messing with it yet, but I plan on it soon.
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Old Sep 29, 2009 | 04:26 PM
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Well, the current high boost setting was programed on 45%. I turned it up to 55% and made a quick pull and it still didnt reach over 10.x psi.
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Old Sep 29, 2009 | 05:16 PM
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then turn it higher
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Old Sep 29, 2009 | 05:21 PM
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Im scared Im gonna blow my **** up hahah
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Old Sep 29, 2009 | 05:24 PM
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how will it blow up if the boost hasnt changed ?

If you arent sure, then get your tuner to do it.
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Old Sep 30, 2009 | 06:37 PM
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Just set the overboost warning maybe 1psi above your desired boost (15) and set it to pull 20-25 % from the duty cycle if it overboosts.

Then just keep increasing the duty cycle until desired boost is reached. If its not increasing check your hoses to solanoid are in good condition, no splits or haven't blown off.
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