tonyhawk Posted February 5, 2008 Share Posted February 5, 2008 I'm intending, as part of my engine rebuild to fully decat my Supe (cat 1 is still in place); I've read all the threads I can find on the subject, but I'm not 100% sure if I need a restrictor ring or not, could someone please help? From what I've read, you need a restrictor ring if you have removed the two cats, but do not have a boost controller; I have an HKS EVC, so I assume that it would control the boost and thus I wouldn't need the restrictor? Is this correct? Thanks Tony Link to comment Share on other sites More sharing options...
Ric Posted February 5, 2008 Share Posted February 5, 2008 Boost controllers cannot lower boost only increase it, therefore you will still need a restrictor ring in place to keep boost below a safe 1.2 bar Link to comment Share on other sites More sharing options...
Gaz6002 Posted February 5, 2008 Share Posted February 5, 2008 You will need to fit the ring mate to stop the car over-boosting to 1.5+ bar. The controller will allow you to set it to different levels but the ring is there to make sure you don't exceed 1.2 bar (or however much boost your RR is made to give). Remember that an electronic boost controller can't lower boost. EDIT: too slow Link to comment Share on other sites More sharing options...
heckler Posted February 5, 2008 Share Posted February 5, 2008 persoanlly with one cat I'd put a ring in. you can then use the boost controller to increase the boost. Boost controller only raise the boost, they cannot lower it. Link to comment Share on other sites More sharing options...
Ric Posted February 5, 2008 Share Posted February 5, 2008 parrots Link to comment Share on other sites More sharing options...
tonyhawk Posted February 5, 2008 Author Share Posted February 5, 2008 Cheers for the response guys, much appreciated Link to comment Share on other sites More sharing options...
jamesmark Posted February 5, 2008 Share Posted February 5, 2008 Best restrictor ring to go for is 1bar RR if you have a boost controller, as then you will be able to raise it. Link to comment Share on other sites More sharing options...
heckler Posted February 5, 2008 Share Posted February 5, 2008 parrots Squark! Link to comment Share on other sites More sharing options...
Gaz6002 Posted February 5, 2008 Share Posted February 5, 2008 Squark! Gazzy want a cracker Link to comment Share on other sites More sharing options...
Mike M Posted February 5, 2008 Share Posted February 5, 2008 I'd say it depends on how free flowing your exhaust is. I've removed both cats and i'm not getting fuel cut, car is definitely quicker but no fuel cut yet. I'm putting it down to the apexi exhaust as it has another silencer behind the back box. Still to check what boost its actually giving as I decided to chance it since I have no FCD fitted yet. Link to comment Share on other sites More sharing options...
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