Electric vs Air to Air
.
14-09-2004 | 10:56 AM
#3
Look at this tread from a few weeks ago. Will help you decide before a can of worms is opened 
https://passionford.com/forum/viewto...819&highlight=
https://passionford.com/forum/viewto...819&highlight=
14-09-2004 | 10:57 AM
#4
PassionFord Post Whore!!
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From: Bristol
14-09-2004 | 10:59 AM
#7
PassionFord Post Whore!!
Joined: May 2003
Posts: 9,582
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From: Bristol
I guess this is the best bit of that post 
Originally Posted by stu@mdevelopments
Ok,
Electronic boost control is in fact closed loop on "Most" controllers which in many ways makes them BETTER than air injectors.
What they do for the uninitiated is they add a high speed solenoid or air pressure valve into the boost signal line. They then monitor the boost output via an inbuilt map sensor and apply various frequencies to the valve to make the wastegate produce the boost pressure that you asked it to...
IE:
Type 20psi into the controller and she will run just that.. 20psi.
The best part is, if your actuator goes weak, she will STILL run 20psi and if its a cold damp night, she will STILL run 20psi.
Air injectors cannot do this unfortunately and simply pulse the valve at a preset frequency at a preset RPM.
The small downside?
Ive personally yet to see one that can reliably handle 30psi having tested 2 and both failed with large peaks at scary and unpredictable times.
(I do however believe that new units to the market are better in this 2bar+respect but i havent tested one so cant comment)
The other impressive feature is of course the gear selectable/engine speed/overboost selectable boost control, but beware, many of these features require serious wiring and mods to work on a cossie ad they are lacking the digital gear and speed selection outputs of their high tech japanese counterparts.
Major downside for me as a professional?
FAr too easy for morons to twiddle the front mounted "Gain/Volume" control during the heat of the moment race.. destroy the engine and give it back and blame me.
"Honest pal, i didnt touch it.. was just doing 40mph in 5th when the crank fell out without warning"
I hope this helps.
Electronic boost control is in fact closed loop on "Most" controllers which in many ways makes them BETTER than air injectors.
What they do for the uninitiated is they add a high speed solenoid or air pressure valve into the boost signal line. They then monitor the boost output via an inbuilt map sensor and apply various frequencies to the valve to make the wastegate produce the boost pressure that you asked it to...
IE:
Type 20psi into the controller and she will run just that.. 20psi.
The best part is, if your actuator goes weak, she will STILL run 20psi and if its a cold damp night, she will STILL run 20psi.
Air injectors cannot do this unfortunately and simply pulse the valve at a preset frequency at a preset RPM.
The small downside?
Ive personally yet to see one that can reliably handle 30psi having tested 2 and both failed with large peaks at scary and unpredictable times.
(I do however believe that new units to the market are better in this 2bar+respect but i havent tested one so cant comment)
The other impressive feature is of course the gear selectable/engine speed/overboost selectable boost control, but beware, many of these features require serious wiring and mods to work on a cossie ad they are lacking the digital gear and speed selection outputs of their high tech japanese counterparts.
Major downside for me as a professional?
FAr too easy for morons to twiddle the front mounted "Gain/Volume" control during the heat of the moment race.. destroy the engine and give it back and blame me.
"Honest pal, i didnt touch it.. was just doing 40mph in 5th when the crank fell out without warning"
I hope this helps.
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14-09-2004 | 11:03 AM
#8
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Joined: May 2003
Posts: 20,599
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From: Ramsgate, Kent Drives: E39 530D Touring
ambiguous question.
do you mean:
what better, ECU controlled boost control or standalone boost controller
or
what better, air-injector based systems or bleed based systems.
both have pros and cons and there are no definitive answers, just opinions
do you mean:
what better, ECU controlled boost control or standalone boost controller
or
what better, air-injector based systems or bleed based systems.
both have pros and cons and there are no definitive answers, just opinions
14-09-2004 | 11:04 AM
#9
Testing the future
Joined: Jul 2003
Posts: 17,597
Likes: 24
From: W. Sussex
the 2 things are not necessarily comparable.
the air 2 air injectors still need to be controlled somehow, whether by the original ecu or by a boost controller.
or, the original ecu could be programmed to use the type of control valve that comes with a boost controller.
best in terms of what? as mike says, air 2 air can be controlled by the ecu (although so could some other form of valve like the escos amal valve) so could be safer, but boost controllers can (in theory) be installed and setup by anyone without having to reprogram the ecu eeprom.
the air 2 air injectors still need to be controlled somehow, whether by the original ecu or by a boost controller.
or, the original ecu could be programmed to use the type of control valve that comes with a boost controller.
best in terms of what? as mike says, air 2 air can be controlled by the ecu (although so could some other form of valve like the escos amal valve) so could be safer, but boost controllers can (in theory) be installed and setup by anyone without having to reprogram the ecu eeprom.
14-09-2004 | 11:04 AM
#11
PassionFord Post Troll
Joined: Apr 2004
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From: Kent
This may help you decide what Electronic controller to go for.
https://passionford.com/forum/viewto...701&highlight=
https://passionford.com/forum/viewto...701&highlight=
14-09-2004 | 11:14 AM
#16
Thread Starter
Too many posts.. I need a life!!
Joined: Aug 2003
Posts: 673
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From: Italy
I'm not to big on the gauge display of the Eboost and besides I'm not boosting to 60psi. If I do than i'll use something else but until then I'll use the Profec B-II.
14-09-2004 | 11:56 AM
#19
Originally Posted by whitneyd
I'm not to big on the gauge display of the Eboost and besides I'm not boosting to 60psi. If I do than i'll use something else but until then I'll use the Profec B-II.
I dont think u'll eva be bossting at 60 psi either. that's over 4 bar!!!!
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