greddy profect b spec II
04-11-10, 01:20 PM
#1
greddy profect b spec II
ok this isnt one of those posts about not understanding the profect. i understand it just fine.
im having issues with getting my boost to respond to the unit. it may be due to a leaky waste gate caused by over-porting. or it could be manythings.
what i would like to know from you guys is only this...
what is your profect set at ?
i been tampering with it based off the evo forums, 30% set, 0 gain increasing by 5% each pull, and set gain at my wanted boost level or lower.
i get all that . but i am having a hard time getting response on my datalogging.
please share with me your profect settings!!!
im having issues with getting my boost to respond to the unit. it may be due to a leaky waste gate caused by over-porting. or it could be manythings.
what i would like to know from you guys is only this...
what is your profect set at ?
i been tampering with it based off the evo forums, 30% set, 0 gain increasing by 5% each pull, and set gain at my wanted boost level or lower.
i get all that . but i am having a hard time getting response on my datalogging.
please share with me your profect settings!!!
04-11-10, 01:44 PM
#2
Everybody's setup is going to be different because of different exhaust and intercooler setups.
I recommend you first make sure gain is 0. Go back and forth between increasing SET and SET GAIN (aka START BOOST) until you reach the peak boost you are looking for. Then add in gain last. But keep in mind that the stock turbo is going to fall off to some extent. What you may find is that if you have SET at 30%, SET GAIN (start boost) set to 0 and GAIN set to 0, it will feel pretty laggy and unresponsive. As you slowly raise the SET GAIN the boost will climb much faster as the controller holds the wastegate shut.
So if you want 10-11psi try a pattern like this:
SET 30%, GAIN 0, SET GAIN 0
SET 40%, GAIN 0, SET GAIN 0
SET 40%, GAIN 0, SET GAIN 5psi --> as soon as you add in SET GAIN you will notice a huge difference
SET 45%, GAIN 0, SET GAIN 5psi
SET 50%, GAIN 0, SET GAIN 6psi --> boost near target value now but falls fast
SET 50% GAIN 20, SET GAIN 6psi --> boost doesn't fall as quickly. now make small final adjustments to each setting
Actual values will differ.
Keep in mind that "SET" and "GAIN" are percentages, while SET GAIN (aka start boost) is actually a pressure value. The key is do not to overuse the GAIN or it will go crazy. You should be able to reach your target boost level (as long as the turbo is mechanically sound) without using any GAIN at all. The GAIN is the feedback control. It is the "intelligent" part of the EBC that responds to what boost the EBC is observing. SET and SET GAIN are "dumb" settings in the sense that they tell the EBC a basic way to pulse the solenoid. Some EBC's don't even have GAIN, like the AEM Tru Boost.
I recommend you first make sure gain is 0. Go back and forth between increasing SET and SET GAIN (aka START BOOST) until you reach the peak boost you are looking for. Then add in gain last. But keep in mind that the stock turbo is going to fall off to some extent. What you may find is that if you have SET at 30%, SET GAIN (start boost) set to 0 and GAIN set to 0, it will feel pretty laggy and unresponsive. As you slowly raise the SET GAIN the boost will climb much faster as the controller holds the wastegate shut.
So if you want 10-11psi try a pattern like this:
SET 30%, GAIN 0, SET GAIN 0
SET 40%, GAIN 0, SET GAIN 0
SET 40%, GAIN 0, SET GAIN 5psi --> as soon as you add in SET GAIN you will notice a huge difference
SET 45%, GAIN 0, SET GAIN 5psi
SET 50%, GAIN 0, SET GAIN 6psi --> boost near target value now but falls fast
SET 50% GAIN 20, SET GAIN 6psi --> boost doesn't fall as quickly. now make small final adjustments to each setting
Actual values will differ.
Keep in mind that "SET" and "GAIN" are percentages, while SET GAIN (aka start boost) is actually a pressure value. The key is do not to overuse the GAIN or it will go crazy. You should be able to reach your target boost level (as long as the turbo is mechanically sound) without using any GAIN at all. The GAIN is the feedback control. It is the "intelligent" part of the EBC that responds to what boost the EBC is observing. SET and SET GAIN are "dumb" settings in the sense that they tell the EBC a basic way to pulse the solenoid. Some EBC's don't even have GAIN, like the AEM Tru Boost.
04-11-10, 01:49 PM
#3
Everybody's setup is going to be different because of different exhaust and intercooler setups.
I recommend you first make sure gain is 0. Go back and forth between increasing SET and SET GAIN (aka START BOOST) until you reach the peak boost you are looking for. Then add in gain last. But keep in mind that the stock turbo is going to fall off to some extent.
What you may find is that if you have SET at 30%, SET GAIN (start boost) set to 0 and GAIN set to 0, it will feel pretty laggy and unresponsive. As you slowly raise the SET GAIN the boost will climb much faster as the controller holds the wastegate shut.
So if you want 10-11psi try a pattern like this:
SET 30%, GAIN 0, SET GAIN 0
SET 40%, GAIN 0, SET GAIN 0
SET 40%, GAIN 0, SET GAIN 5psi --> as soon as you add in SET GAIN you will notice a huge difference
SET 45%, GAIN 0, SET GAIN 5psi
SET 50%, GAIN 0, SET GAIN 6psi --> boost near target value now but falls fast
SET 50% GAIN 20, SET GAIN 6psi --> boost doesn't fall as quickly. now make small final adjustments to each setting
Actual values will differ.
Keep in mind that "SET" and "GAIN" are percentages, while SET GAIN (aka start boost) is actually a pressure value. The key is do not to overuse the GAIN or it will go crazy. You should be able to reach your target boost level (as long as the turbo is mechanically sound) without using any GAIN at all. The GAIN is the feedback control. It is the "intelligent" part of the EBC that incorporates the feedback. SET and SET GAIN are "dumb" settings in the sense that they just tell the EBC a basic way to pulse the solenoid.
I recommend you first make sure gain is 0. Go back and forth between increasing SET and SET GAIN (aka START BOOST) until you reach the peak boost you are looking for. Then add in gain last. But keep in mind that the stock turbo is going to fall off to some extent.
What you may find is that if you have SET at 30%, SET GAIN (start boost) set to 0 and GAIN set to 0, it will feel pretty laggy and unresponsive. As you slowly raise the SET GAIN the boost will climb much faster as the controller holds the wastegate shut.
So if you want 10-11psi try a pattern like this:
SET 30%, GAIN 0, SET GAIN 0
SET 40%, GAIN 0, SET GAIN 0
SET 40%, GAIN 0, SET GAIN 5psi --> as soon as you add in SET GAIN you will notice a huge difference
SET 45%, GAIN 0, SET GAIN 5psi
SET 50%, GAIN 0, SET GAIN 6psi --> boost near target value now but falls fast
SET 50% GAIN 20, SET GAIN 6psi --> boost doesn't fall as quickly. now make small final adjustments to each setting
Actual values will differ.
Keep in mind that "SET" and "GAIN" are percentages, while SET GAIN (aka start boost) is actually a pressure value. The key is do not to overuse the GAIN or it will go crazy. You should be able to reach your target boost level (as long as the turbo is mechanically sound) without using any GAIN at all. The GAIN is the feedback control. It is the "intelligent" part of the EBC that incorporates the feedback. SET and SET GAIN are "dumb" settings in the sense that they just tell the EBC a basic way to pulse the solenoid.
again thank you so much.
04-11-10, 02:19 PM
#5
be careful too, the Profec has some confusing units with the kPA vs PSI. Doesn't a set boost of 80 actually mean 8psi when using PSI units mode?
most external boost controllers aren't that complicated but they often aren't fully understood.
i guess on the evo forum they were using a different approach.
04-11-10, 02:41 PM
#6
also keep in mind that all the EBC's which use solenoids (not stepper motors) and actual digital settings (not *****) are very similar in the way they control the boost.
On the AVC-R for example, the Start Duty has the same function as the SET GAIN/start boost on the Spec II although it's adjusted a little differently. The Duty map in the AVCR is similar to the SET function on the Spec II. The feedback speed setting on the AVCR is equivalent to the GAIN on the Spec II. On the AVC-R though you can adjust these parameters separately for each gear and you can set an actual target boost value for the feedback to shoot for. The AVCR is actually a lot like the OEM boost control in Subarus.
On the AEM Tru Boost there is a duty value and start boost/set gain value, but the start boost pressure is called the "spring" pressure and there is no gain setting at all. On the Turbosmart eboost they call it boost pressure, gate pressure, and sensitivity instead of the Greddy nomenclature.
On the AVC-R for example, the Start Duty has the same function as the SET GAIN/start boost on the Spec II although it's adjusted a little differently. The Duty map in the AVCR is similar to the SET function on the Spec II. The feedback speed setting on the AVCR is equivalent to the GAIN on the Spec II. On the AVC-R though you can adjust these parameters separately for each gear and you can set an actual target boost value for the feedback to shoot for. The AVCR is actually a lot like the OEM boost control in Subarus.
On the AEM Tru Boost there is a duty value and start boost/set gain value, but the start boost pressure is called the "spring" pressure and there is no gain setting at all. On the Turbosmart eboost they call it boost pressure, gate pressure, and sensitivity instead of the Greddy nomenclature.
04-11-10, 03:15 PM
#7
i wish they would make an ebc that is self learning. monitors the curve of your boost pressure vs rpm and throttle and automatically adjusts boost accordingly @_@
i bet if they do make one already, its prob very expensive
dont worry i am being carefull, hence why i created the post. so i could get a good understanding of others settings.
i bet if they do make one already, its prob very expensive
dont worry i am being carefull, hence why i created the post. so i could get a good understanding of others settings.
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04-11-10, 05:20 PM
#9
i wish they would make an ebc that is self learning. monitors the curve of your boost pressure vs rpm and throttle and automatically adjusts boost accordingly @_@
i bet if they do make one already, its prob very expensive
dont worry i am being carefull, hence why i created the post. so i could get a good understanding of others settings.
i bet if they do make one already, its prob very expensive
dont worry i am being carefull, hence why i created the post. so i could get a good understanding of others settings.
04-11-10, 05:29 PM
#10
i wish they made one where you actually set desired boost level instead of a relative duty cycle. I have the profec II and every day it it changes its mind how much boost to run 
my settings are
low boost (10psi)
set 0% creeps like a ****
gain 8%
set gain 100
high boost (15psi)
set 65%
gain 8%
set gain 140
my settings are
low boost (10psi)
set 0% creeps like a ****
gain 8%
set gain 100
high boost (15psi)
set 65%
gain 8%
set gain 140
