wkdtime Posted September 7, 2006 Share Posted September 7, 2006 This has bugged me for ages and yet i have not seen any information at why this is. JDM's supra's when decatted require a Restrictor ring to keep the boost down, as the JDM wastegates are easily over whelmed. So why is it that there are so many JDM supra's that are full decat and no ring and boost to around 0.9-1.1 bar and require an EBC to increase boost there on further, similar to UK cars. To name a few, Nic, Kosmic dont need a restrictor ring and both are fully decatted. So why is this the case? Quote Link to comment Share on other sites More sharing options...
wkdtime Posted September 7, 2006 Author Share Posted September 7, 2006 Stop ducking this question you sods:D Quote Link to comment Share on other sites More sharing options...
Guest mk47 Posted September 7, 2006 Share Posted September 7, 2006 its a mystery Quote Link to comment Share on other sites More sharing options...
albundy68 Posted September 7, 2006 Share Posted September 7, 2006 could it be to do with age? i de catted mine with ring a while ago, but didnt feel any significant power increase. not sure of boost as gauge didnt get fitted, will check when it does, mines a facelift, is niks/cosmics? if so it could be another thing mr T tweaked wiv the post 96's Quote Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted September 7, 2006 Share Posted September 7, 2006 if so it could be another thing mr T tweaked wiv the post 96's Mines March 97, but pre VVTi, and I needed a restrictor ring Quote Link to comment Share on other sites More sharing options...
kosmic Posted September 7, 2006 Share Posted September 7, 2006 i thought the same but im beginning to think it may be down to a sticky/jammed wastegate. it would be interesting to know how many others have the same on the JDMs Quote Link to comment Share on other sites More sharing options...
mr lover Posted September 7, 2006 Share Posted September 7, 2006 mine boosts to 0.9 with ring and 1.1 without ring, my exhaust (make unknown) is 2.5 inch bore which i am sure makes a difference Quote Link to comment Share on other sites More sharing options...
albundy68 Posted September 7, 2006 Share Posted September 7, 2006 Mines March 97, but pre VVTi, and I needed a restrictor ring so's mine! they might have been production line neighbours! Quote Link to comment Share on other sites More sharing options...
kosmic Posted September 7, 2006 Share Posted September 7, 2006 mines a pre-vvti. has the tanabe which has huge straight piping and probably one of the most unrestrictive exhaust out there. im running 2.5" decats which may be the bottleneck?! without the ring i can just about hit fuel cut at 1.0bar on a cold day but usually about 0.9-0.95 bar Quote Link to comment Share on other sites More sharing options...
wkdtime Posted September 7, 2006 Author Share Posted September 7, 2006 Kosmic let me know when you have fitted the EBC:) Quote Link to comment Share on other sites More sharing options...
supRo Posted September 7, 2006 Share Posted September 7, 2006 My pre-vvti makes about 1.4-1.5 bar without a restrictor ring. I have 3" zorst piping Quote Link to comment Share on other sites More sharing options...
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