SupraShaun Posted October 15, 2010 Share Posted October 15, 2010 Hi all, hopefull someone will have some ideas on this issue. Normally on my fully decated (Envy 3" deacts with 1.2bar restrictor ring) BPU TT (Jspec) I get just about 1 bar boost. Ive temporarily fitted my my second cat whilst I get an AFR bung welded to my second decat, with the second cat back in place I am getting easily 1.1/ 1.2 bar. The only thing I can asume is that the restrctor ring is more restrictive than the second cat (is this even possible ?), the diameter of the restrictor ring is 50.8mm which seems to be similar to what everyone else is using. If anyone has any ideas as to whats going on that would be great! Shaun Quote Link to comment Share on other sites More sharing options...
Scott Posted October 15, 2010 Share Posted October 15, 2010 It's not an exact science bud. I would recommend you hit 1.0bar in the lower gears and 1.1 in the higher gears with the RR in. Just open it out a tiny bit at a time with a dremmel and take it for a run till you hit those figures. I haven't gotten round to it yet but that's what I'm going to do as I'm not happy with my EGTs with the RR only allowing 0.9bar. Quote Link to comment Share on other sites More sharing options...
SupraShaun Posted October 15, 2010 Author Share Posted October 15, 2010 Hi Scott, what mm increments would you recommend openeing it out at? Quote Link to comment Share on other sites More sharing options...
Scott Posted October 15, 2010 Share Posted October 15, 2010 I would go with 0.5. I'm going to take 1mm out of mine to begin with, see where that takes me and then go with 0.5 at a time, if it does nothing then I'll take another 1mm. Quote Link to comment Share on other sites More sharing options...
SupraShaun Posted October 15, 2010 Author Share Posted October 15, 2010 Ok mate thanks. I think ill open up to 52mm and see what happens, if its still low ill get a boost controller and up it the rest of the way with that. Quote Link to comment Share on other sites More sharing options...
Nic Posted October 15, 2010 Share Posted October 15, 2010 The only thing I can asume is that the restrctor ring is more restrictive than the second cat (is this even possible ?) Yes it is possible and would seem to be the case. Quote Link to comment Share on other sites More sharing options...
Scott Posted October 15, 2010 Share Posted October 15, 2010 Ok mate thanks. I think ill open up to 52mm and see what happens, if its still low ill get a boost controller and up it the rest of the way with that. As I said, you will need to be warey of your EGTs. I have a boost controller upping mine from 0.9 to 1.2 and my EGT's are higher than they were. I'd rather see 1.1 and then up it to 1.2 with the boost controller to keep the EGTs to a minimum. Quote Link to comment Share on other sites More sharing options...
SupraShaun Posted October 15, 2010 Author Share Posted October 15, 2010 Opened restrictor up to 52mm this evening and I'm now boosting to 1.1/1.2bar with the decat back in. Quote Link to comment Share on other sites More sharing options...
Scott Posted October 15, 2010 Share Posted October 15, 2010 Perfect, well done. Are you hitting 1.2 in the higher gears only? Quote Link to comment Share on other sites More sharing options...
SupraShaun Posted October 15, 2010 Author Share Posted October 15, 2010 Yes mate Quote Link to comment Share on other sites More sharing options...
Scott Posted October 16, 2010 Share Posted October 16, 2010 Bingo Quote Link to comment Share on other sites More sharing options...
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