Martin959 Posted August 25, 2014 Share Posted August 25, 2014 Honestly... whats the difference? Plus, you cant actually controll the valves on your car, those are controlled by the timing belt... Thanks guys! :) Quote Link to comment Share on other sites More sharing options...
Jay762 Posted August 25, 2014 Share Posted August 25, 2014 the valve controller reference is an Idle air control valve, not the intake or exhaust valves, as you correctly say these are activated by the belts http://www.amazon.co.uk/Idle-Air-Control-Valve-22650AA192/dp/B00LN28FWO where as the boost controller controls how much pressure builds up in your intake system http://www.amazon.co.uk/Subaru-Impreza-Manual-Boost-Controller/dp/B001MMY87Q please note these links are for illustration purposes I am not recommending them or the source Quote Link to comment Share on other sites More sharing options...
Martin959 Posted August 25, 2014 Author Share Posted August 25, 2014 the valve controller reference is an Idle air control valve, not the intake or exhaust valves, as you correctly say these are activated by the belts http://www.amazon.co.uk/Idle-Air-Control-Valve-22650AA192/dp/B00LN28FWO where as the boost controller controls how much pressure builds up in your intake system http://www.amazon.co.uk/Subaru-Impreza-Manual-Boost-Controller/dp/B001MMY87Q please note these links are for illustration purposes I am not recommending them or the source Got it, so the valve controller is pretty much usless... a boost controller makes more sense... :P Quote Link to comment Share on other sites More sharing options...
Jay762 Posted August 25, 2014 Share Posted August 25, 2014 it does for increasing performance ;) - there are tumble generator valves on some engines also but I believe they are controlled from the ECU Quote Link to comment Share on other sites More sharing options...
quit Posted August 25, 2014 Share Posted August 25, 2014 Fit either need a new engine within 2 months mate Quote Link to comment Share on other sites More sharing options...
Martin959 Posted August 25, 2014 Author Share Posted August 25, 2014 Fit either need a new engine within 2 months mate So, if you install one of these, it will wreck your engine? o.0 Quote Link to comment Share on other sites More sharing options...
quit Posted August 25, 2014 Share Posted August 25, 2014 Yes is the easy answer If you want adjustable boost then look into a bee r limiter or apexi unit but you need to know what your doing and be able to read air fuel mixture readings 2 Quote Link to comment Share on other sites More sharing options...
Martin959 Posted August 25, 2014 Author Share Posted August 25, 2014 Its a shame... I really wanted to change the turbo and put a boost controller... not in order to put more psi, but to set it in less... and when its time to race, set it at high PSI... :) Quote Link to comment Share on other sites More sharing options...
quit Posted August 25, 2014 Share Posted August 25, 2014 Map it in by all means mate , your mapper will know what they are doing Years ago I had one on my vectra , allowed me to select low boost when it was out my hands Quote Link to comment Share on other sites More sharing options...
Ash007ks Posted August 25, 2014 Share Posted August 25, 2014 has cropped up many times before in convo and is always the same answer, avoid im afraid. Quote Link to comment Share on other sites More sharing options...
quit Posted August 26, 2014 Share Posted August 26, 2014 I'm fitting a bee-r limiter just because lol Quote Link to comment Share on other sites More sharing options...
Adam Posted August 26, 2014 Share Posted August 26, 2014 Think of the boost control valve as a safety net. It is there stop you over-boosting, and thus it protects your internals and gaskets from excessive pressure. The maximum boost pressure is set by the ECU map and when that limit is approached the vale will start to pulse, diverting boost pressure to the wastegate actuator which opens the wastegate diverting exhaust gases away from the turbo. It the maximum boost pressure is exceeded the value will open permanently, fully opening the wastegate and cutting boost. When the car is mapped the mapper can control two things... The rate the control valve pulses and the maximum boost cut off. The first of these, if done well, will let the ECU hold the boost pressure at a fixed level. Get it wrong and the boost will oscillate and you wont get a smooth power delivery. The maximum level speaks for itself. A standard Subaru engine in good condition will hold 1.4 bar without risk, but most will be set to 1.1 or less by Subaru, depending on model, as a good safety margin. As for controlling your intake and exhaust valves... If you have AVCS on your car then these can also be controlled, but again you will need to get a mapper to do that for you. The tumblers are there purely to help reduce emissions and are often removed! 1 Quote Link to comment Share on other sites More sharing options...
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