Guest Carsten Posted April 9, 2011 Share Posted April 9, 2011 Hey guys, i have a little problem with my car Specs are as follows: 93 Jspec TT AT Big intercooler with piping 3" Nur Spec Catback 3" First Decat Stock Midpipe with stock cat So i installed my 3" First decat today with the restrictor ring from Chris. Right now i dont have my FCD installed so i expected a boost cut while going full throttle. Sadly my boost stayed all the way at round about 0,6 Bar / 8,7 psi. But i can´t figure out why?! Ive all parts for BPU and just get stock boost ( My only thought was that the midpipe with stock cat is too restrictive Andy idea? http://img801.imageshack.us/img801/6298/p1000568o.th.jpg Quote Link to comment Share on other sites More sharing options...
scotty71 Posted April 9, 2011 Share Posted April 9, 2011 (edited) So you have 1st decat and 2nd cat?? and fitted a restrictor ring? Ditch the 2nd cat for a decat I do not think you would need a RR with the 2nd cat on as there would be enough resistance from that Edited April 9, 2011 by scotty71 (see edit history) Quote Link to comment Share on other sites More sharing options...
CanisLupus Posted April 9, 2011 Share Posted April 9, 2011 With 2nd cat in place you shouldn't overboost even without a restrictor ring. Quote Link to comment Share on other sites More sharing options...
scotty71 Posted April 9, 2011 Share Posted April 9, 2011 With 2nd cat in place you shouldn't overboost even without a restrictor ring. exactly, remove the RR and see what you are boosting, or get a 2nd de-cat Quote Link to comment Share on other sites More sharing options...
Guest Carsten Posted April 9, 2011 Share Posted April 9, 2011 Okay i will remove the RR and see what happens Quote Link to comment Share on other sites More sharing options...
BOB B Posted April 9, 2011 Share Posted April 9, 2011 Mate leave the RR in and get a de-cat pipe instead of the second cat, then you should see boosts of 1.1/1.2 depending on size of RR. Quote Link to comment Share on other sites More sharing options...
scotty71 Posted April 9, 2011 Share Posted April 9, 2011 I think he maybe leaving the cat in due to EU leg. Strange having all the parts for BPU and leaving a cat in and fitting a RR Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted April 9, 2011 Share Posted April 9, 2011 Just because your manifold isn't seeing more than 8psi doesn't mean your turbo's aren't. Boost leak could show 8psi even though your turbos could be overboosting although with the 2nd cat in you could just be unlucky like me (1bar with a full decat) Quote Link to comment Share on other sites More sharing options...
Guest Carsten Posted April 9, 2011 Share Posted April 9, 2011 (edited) Na the first decat didnt make any change in power. Doesnt feel different to before. I need 1 cat in place for co2 regulations. Maybe replace the stock cat by a racing cat. So removing the restrictor ring should show me more boost (if everything is alright) also with the second cat still stock. @bigbloodyturbo: The turbos spool only with stock power. I recently ran against a new 370z (310hp on dyno) and we were dead even. So it can´t be, that my turbos spool more then stock Edited April 9, 2011 by Carsten (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest Carsten Posted April 10, 2011 Share Posted April 10, 2011 Good news everyone I remove the RR today and hit 0,9 Bar on the first two runs. The next 3-6 runs the boost gauge only showed me 0,6 Bar but the power felt the same. I think i realy hit 0,9 bar and that my gauge is just shit Going to buy a nice Boostcontroller which will sort that out Quote Link to comment Share on other sites More sharing options...
Paul372 Posted April 10, 2011 Share Posted April 10, 2011 and i would sort out that oil leak you have Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted April 10, 2011 Share Posted April 10, 2011 @bigbloodyturbo: The turbos spool only with stock power. I recently ran against a new 370z (310hp on dyno) and we were dead even. So it can´t be, that my turbos spool more then stock How do you figure that it couldn't be a boost leak:taped:. It may not be but your theory doesn't make any sense. Your boost gauge does not show what your turbos are doing, it only shows what your manifold is getting. If you had a boost leak your manifold could show lower boost but your turbos could be overboosting. It would explain why your down on power to. It's up to you but its a simple check and something i would personally do if i had just dumped a load of backpressure and got NO extra boost on my gauge, especially on a jspec with our cr@p wastegate. Your engine though. Quote Link to comment Share on other sites More sharing options...
Guest Carsten Posted April 10, 2011 Share Posted April 10, 2011 and i would sort out that oil leak you have Already done, was the oil pan Quote Link to comment Share on other sites More sharing options...
Guest Carsten Posted April 10, 2011 Share Posted April 10, 2011 How do you figure that it couldn't be a boost leak:taped:. It may not be but your theory doesn't make any sense. Your boost gauge does not show what your turbos are doing, it only shows what your manifold is getting. If you had a boost leak your manifold could show lower boost but your turbos could be overboosting. It would explain why your down on power to. It's up to you but its a simple check and something i would personally do if i had just dumped a load of backpressure and got NO extra boost on my gauge, especially on a jspec with our cr@p wastegate. Your engine though. I will check every hose tomorrow. Will see if there is any leak. Quote Link to comment Share on other sites More sharing options...
Guest Carsten Posted April 12, 2011 Share Posted April 12, 2011 Fuelcut in True Twin Conversion with an amazing thrust. Hmmmm thats wierd :/ Quote Link to comment Share on other sites More sharing options...
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