Paul R Posted June 14, 2003 Share Posted June 14, 2003 Hi, I've heard a few times that the boost level automaticaly rises on an imported TT if you do such things as remove the cat, but the boost level wont rise on a UK TT? Is this right? What is the difference between the two cars?? Paul. Link to comment Share on other sites More sharing options...
Thorin Posted June 14, 2003 Share Posted June 14, 2003 I think Martin F may be along shortly to instruct you in the use of the search button, but... It's something to do with the size of the wastegate on the J-Spec being not big enough to regulate the boost when the restriction of both cats is removed. Link to comment Share on other sites More sharing options...
Roy Posted June 14, 2003 Share Posted June 14, 2003 I think Martin F may be along shortly to instruct you in the use of the search button, LOL .................... Link to comment Share on other sites More sharing options...
Steve W Posted June 15, 2003 Share Posted June 15, 2003 It's something to do with the size of the wastegate on the J-Spec being not big enough to regulate the boost when the restriction of both cats is removed. Spot-on Thorin-babes..... the wastgate on my poor old J' is quite a bit smaller than a UK... It can't cope with 'getting-rid' of as much excess boost as well as the UK wastgate..... UP TO THAT point it makes no difference but it's about the level of BPU that it CAN occur.... [no idea why some J' cars suffer from it and others don't ? ?] Having said that, mine's de-cat / NUR / NO restrictor, and is steady at @1.1 at present...... FatS. Link to comment Share on other sites More sharing options...
Justin Posted June 15, 2003 Share Posted June 15, 2003 When I fitted my Nur spec on my J spec TT and removed both cats my boost went up to 21.5 psi. I fitted the restrictor plate to get it down to 17.5/18.0 psi. Link to comment Share on other sites More sharing options...
Steve W Posted June 15, 2003 Share Posted June 15, 2003 21.5 ! ! ! that's about 1.5/1.6 Bar ! ! ! Blimey, the Soops really DO vary ! ! ! Link to comment Share on other sites More sharing options...
Paul R Posted June 15, 2003 Author Share Posted June 15, 2003 Originally posted by Justin When I fitted my Nur spec on my J spec TT and removed both cats my boost went up to 21.5 psi. I fitted the restrictor plate to get it down to 17.5/18.0 psi. Is your car modified(in the internal department). Isnt that a bit dodgy getting the boost up that high? what kinda RWHP you putting out?? Link to comment Share on other sites More sharing options...
Thorin Posted June 15, 2003 Share Posted June 15, 2003 Originally posted by p_radbone Is your car modified(in the internal department). Isnt that a bit dodgy getting the boost up that high? what kinda RWHP you putting out?? When decatted with a aftermarket exhaust the boost can rise dramatically on a J-Spec, I too saw 1.5bar before fitting a restrictor ring. Justin is well aware that that was too high, hence him fitting a restrictor and now running ~18psi Link to comment Share on other sites More sharing options...
Paul R Posted June 15, 2003 Author Share Posted June 15, 2003 Ok sorry, didnt mean to sound patronising. I'm new to this supra thing! i take it you all have boost guages fitted? Perhaps that should be the first mod I do? Paul. Link to comment Share on other sites More sharing options...
Thorin Posted June 15, 2003 Share Posted June 15, 2003 Originally posted by p_radbone Ok sorry, didnt mean to sound patronising. I'm new to this supra thing! i take it you all have boost guages fitted? Perhaps that should be the first mod I do? Paul. Yep, good very good idea Link to comment Share on other sites More sharing options...
MONKEYmark Posted June 16, 2003 Share Posted June 16, 2003 and EGT gauge was 1.2 on sequential mode now back up to 1.4bar in TTC mode going back to sequential mode soon, love the sounf of TTC mode makes your car loud as hell Link to comment Share on other sites More sharing options...
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