Guest jmccor Posted June 9, 2007 Share Posted June 9, 2007 I have just bought a damaged 94 j-spec tt auto supra, its only going to be used on the track, exhaust after downpipe cat was missing, so we put on a complete home made exhaust(no cats). it has no restrictor ring Have taken it out for a run and its boosting to .9 my question is do I still need a restrictor ring? what part of the exhaust is ring usually put on? will I need a boost controller? Cheers J Quote Link to comment Share on other sites More sharing options...
Nic Posted June 9, 2007 Share Posted June 9, 2007 If it is only boosting to 0.9bar you do not need a restrictor ring. Have both cats been removed or just the one? Normally on a J-spec Supra if both cats have been removed, the wastegate cannot regulate boost, which causes the boost to go sky high. A restrictor ring basically adds a restriction in the exhaust to create back pressure and keep boost down to a safe level. If you want to boost above 0.9bar, yes you will need a boost controller or bleed valve. Quote Link to comment Share on other sites More sharing options...
Guest jmccor Posted June 9, 2007 Share Posted June 9, 2007 Both cats have been removed, do i then have a problem if its only boosting to .9 ? is the restrictor ring fitted at the manifold or down the exhaust? Quote Link to comment Share on other sites More sharing options...
dini_the_owl Posted July 20, 2007 Share Posted July 20, 2007 normally between 1st and second cat Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted July 20, 2007 Share Posted July 20, 2007 What diameter is the exhaust at its narrowest point? When you say home made, made from what? What design and size is the back box? Quote Link to comment Share on other sites More sharing options...
Homer Posted July 20, 2007 Share Posted July 20, 2007 Are you sure the 2nd turbo is coming online? Do you have a boost gauge fitted and if so can you tell us exactly what the boost reading is through the rev range in a high gear (5th or 6th in a manual, 3rd or 4th in an auto). With both cats removed you should see it climb to 0.6ish bar at 3.6krpm, then a slight drop and it boost to at least 1.2 bar by 4.4k rpm. If is not then something's wrong. Unless it's a genuine UK car of course Quote Link to comment Share on other sites More sharing options...
redsupraman82 Posted July 20, 2007 Share Posted July 20, 2007 sorry wrong thread!!..............it happens! Quote Link to comment Share on other sites More sharing options...
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