Tim0546 Member 9 Member For: 14y 11m 7d Posted 08/04/12 02:03 AM Share Posted 08/04/12 02:03 AM Hi guys, had my FG tuned recently to 17psi but shortly after it became really quiet and laggay as the hi-flo cat had started to collapse, We decided to hollow it out to see what difference it made, the responsivness of the car increased and it hits boost much better but it no longer hits 17psi ??? max boost is only 15psi. I thought removing the restriction would possibly cause overboost not a loss in boost? if anyone could explain it would be much appreciated Thanks, Mods are as follows;Hdi Cooler4" battery side intakeGT3540 with ar.70 comp coverported wategate12psi actuator4" Dump4"in 3"out Cat (5" body) standard 3" Catback with rear muffler removedsiemens 60lbWalbro pumpSCT Engine and ZF tuned Link to comment Share on other sites More sharing options...
FG50T Member 568 Member For: 21y 14d Gender: Male Location: Melbourne Posted 08/04/12 05:22 AM Share Posted 08/04/12 05:22 AM Possible your mufflers a bit blocked too? Link to comment Share on other sites More sharing options...
MiKa Donating Members 4,243 Member For: 18y 6m 6d Gender: Male Location: Melbourne, VIC Posted 08/04/12 06:27 AM Share Posted 08/04/12 06:27 AM With stupid.. maybe some of the cat went further and got stuck somewhere? Link to comment Share on other sites More sharing options...
Pazzo Donating Members 11,132 Member For: 14y 4m 5d Gender: Male Posted 08/04/12 07:10 AM Share Posted 08/04/12 07:10 AM ^^^^^^^^^^^^^^^^^^^^With stupids Link to comment Share on other sites More sharing options...
Impellor Member 835 Member For: 14y 7m 7d Gender: Not Telling Posted 08/04/12 08:03 AM Share Posted 08/04/12 08:03 AM (edited) Hmmm? Cheers Edited 08/04/12 08:05 AM by Impellor Link to comment Share on other sites More sharing options...
Pazzo Donating Members 11,132 Member For: 14y 4m 5d Gender: Male Posted 08/04/12 08:05 AM Share Posted 08/04/12 08:05 AM Yes but some of the collapsed cat could be stuck in muffler. 1 Link to comment Share on other sites More sharing options...
sexual harrassment panda I see a red door and I want to paint it black Donating Members 5,919 Member For: 15y 4m 1d Gender: Male Location: Far north queensland Posted 08/04/12 08:06 AM Share Posted 08/04/12 08:06 AM yes, but after it collapsed.I had cat fail on a previous car and needed muffler replaced as well Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 9m 11d Gender: Male Location: adelaide hills- 'race air' central Posted 08/04/12 08:24 AM Share Posted 08/04/12 08:24 AM but running a gutted cat is illegal- no one would do that.... Link to comment Share on other sites More sharing options...
sexual harrassment panda I see a red door and I want to paint it black Donating Members 5,919 Member For: 15y 4m 1d Gender: Male Location: Far north queensland Posted 08/04/12 08:28 AM Share Posted 08/04/12 08:28 AM maybe he's from nz Link to comment Share on other sites More sharing options...
bjc Donating Members 2,823 Member For: 21y 5m 23d Gender: Male Location: Townsville Posted 08/04/12 10:26 AM Share Posted 08/04/12 10:26 AM Yes, no one would do that... Link to comment Share on other sites More sharing options...
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