Nic Posted June 2, 2012 Share Posted June 2, 2012 (edited) If you've removed the restrictor ring and it's still only making 11psi with both cats removed then I'd suspect a boost leak somewhere, check all the vacuum, IC hoses and BOV. http://www.mkivsupra.net/vbb/showthread.php?35924-Sequential-turbo-hoses&highlight=sequential http://www.mkivsupra.net/vbb/showthread.php?35926-The-sequential-system&highlight=sequential Edited June 2, 2012 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
ashbuster Posted June 2, 2012 Share Posted June 2, 2012 (edited) my hks fcd is set on 7 bud ***edit*** sorry mine is 9 too Edited June 2, 2012 by ashbuster (see edit history) Quote Link to comment Share on other sites More sharing options...
Mugello Posted June 2, 2012 Share Posted June 2, 2012 my hks fcd is set on 7 bud Isnt the supra setting on 9 ? Quote Link to comment Share on other sites More sharing options...
ashbuster Posted June 2, 2012 Share Posted June 2, 2012 my mistake mine is 9 Quote Link to comment Share on other sites More sharing options...
safcdixon Posted June 2, 2012 Share Posted June 2, 2012 my hks fcd is set on 7 bud Sure the supra setting is 9 (edit too slow) Quote Link to comment Share on other sites More sharing options...
Mugello Posted June 2, 2012 Share Posted June 2, 2012 my mistake mine is 9 Quote Link to comment Share on other sites More sharing options...
Branners Posted June 2, 2012 Share Posted June 2, 2012 I may have missed it, but what exhaust do you have fitted? 2.5" downpipe will also restrict the boost a bit. Quote Link to comment Share on other sites More sharing options...
ashbuster Posted June 2, 2012 Share Posted June 2, 2012 mines a 2.5 inch too and the usual chris wilson decats are 2.5inch and needed the ring mate Quote Link to comment Share on other sites More sharing options...
JMB Posted June 2, 2012 Share Posted June 2, 2012 Hi all, I ve got Stock turbos with a fully decat + RR & it is 11 psi too ?! I don t think that modifying the exhaust increase the turbos psi ... Quote Link to comment Share on other sites More sharing options...
JMB Posted June 2, 2012 Share Posted June 2, 2012 By the way, I be got a boost cut controller and I never install it as I got a vvti model. Can anyone help me with this ? Quote Link to comment Share on other sites More sharing options...
tony tt Posted June 2, 2012 Share Posted June 2, 2012 I don t think that modifying the exhaust increase the turbos psi ... If you de-cat the exhaust it reduces back pressure to the turbos which causes the turbos to spool more aggresive and higher psi as a result. Check for any boost leaks. Quote Link to comment Share on other sites More sharing options...
ashbuster Posted June 2, 2012 Share Posted June 2, 2012 also like branners posted , what exhausts do you guys have, stock? Quote Link to comment Share on other sites More sharing options...
JMB Posted June 2, 2012 Share Posted June 2, 2012 also like branners posted , what exhausts do you guys have, stock? Full decat 2,5" Line + restrictor ring + blitz nur spec R Quote Link to comment Share on other sites More sharing options...
JMB Posted June 2, 2012 Share Posted June 2, 2012 If you de-cat the exhaust it reduces back pressure to the turbos which causes the turbos to spool more aggresive and higher psi as a result. Check for any boost leaks. I ll Check, but what is strange is that I was already going to 11psi before modifying my exhaust... Quote Link to comment Share on other sites More sharing options...
viper Posted June 3, 2012 Author Share Posted June 3, 2012 Not sure of the make but i have 2.5inch first decat, 2.5 inch midpipe and 3inch 2nd decat and 3inch back from that. Before i went bpu i was getting 11psi nicely as expected from stock. But since going bpu its all over the place. I did a run yesterday flooring it in first and second and got 5psi down to 3psi in first and then 9 psi in second. Im geussing do to the boost fluturation iv got a leak somewhere. Im going to reattach the stock bov and block the blitz bov i have to first rule that out. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted June 3, 2012 Share Posted June 3, 2012 FCD fitted still stuck on 11psi, Im sure you know the FCD or fuel cut defencer, has absolutely nothing to do with boost pressure. Quote Link to comment Share on other sites More sharing options...
Nic Posted June 3, 2012 Share Posted June 3, 2012 If you've removed the restrictor ring and it's still only making 11psi with both cats removed then I'd suspect a boost leak somewhere, check all the vacuum, IC hoses and BOV. http://www.mkivsupra.net/vbb/showthread.php?35924-Sequential-turbo-hoses&highlight=sequential http://www.mkivsupra.net/vbb/showthread.php?35926-The-sequential-system&highlight=sequential Do the above, if that doesn't make any difference then I'd check the condition of the turbo impeller wheels. Quote Link to comment Share on other sites More sharing options...
ashbuster Posted June 3, 2012 Share Posted June 3, 2012 2.5inch first decat, 2.5 inch midpipe and 3inch 2nd decat and 3inch back from that mine goes 2.5" 1st decat / 2.5" 2nd decat / 3" cat back Quote Link to comment Share on other sites More sharing options...
Lude Posted June 3, 2012 Share Posted June 3, 2012 boost controller and raise it up? Quote Link to comment Share on other sites More sharing options...
ashbuster Posted June 3, 2012 Share Posted June 3, 2012 somethings sound wrong tho bud, like a leak Quote Link to comment Share on other sites More sharing options...
Guest George89 Posted June 3, 2012 Share Posted June 3, 2012 Not sure of the make but i have 2.5inch first decat, 2.5 inch midpipe and 3inch 2nd decat and 3inch back from that. Before i went bpu i was getting 11psi nicely as expected from stock. But since going bpu its all over the place. I did a run yesterday flooring it in first and second and got 5psi down to 3psi in first and then 9 psi in second. Im geussing do to the boost fluturation iv got a leak somewhere. Im going to reattach the stock bov and block the blitz bov i have to first rule that out. I had a similar problem last year. it ended up being my BOV leaking pretty badly (Blitz BOV) Quote Link to comment Share on other sites More sharing options...
JMB Posted June 3, 2012 Share Posted June 3, 2012 If the bov is atmosphere and not recycling, can it change anything about the boost pressure ? Quote Link to comment Share on other sites More sharing options...
Guest George89 Posted June 3, 2012 Share Posted June 3, 2012 no it won't effect boost pressure. If you can take the BOV off put some water where the bov is ment too open and then blow hard through the vacuum hose that originally attaches to the intake manifold. Its a weird way to test but it worked for me. saw it bubbling so it wasn't sealing properly. Got a new dumb valve and was fine. (this aint a proper way to test but its free) Quote Link to comment Share on other sites More sharing options...
ashbuster Posted June 3, 2012 Share Posted June 3, 2012 did you get chance to check the bov viper? Quote Link to comment Share on other sites More sharing options...
JMB Posted June 3, 2012 Share Posted June 3, 2012 I got a tiptronic. On "L" : reach 9 psi On "2" : reach 11-12-11-12 (don t stop changing) Same thing for "3" What do you think ? When I ll have Time, i ll Check all the hoses... Quote Link to comment Share on other sites More sharing options...
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