mac79 Posted May 6, 2015 Share Posted May 6, 2015 I am about to fit some whifbitz twin hybrids on my jspec. do I still need the RR fitted or can it be removed now? Link to comment Share on other sites More sharing options...
mattdavies Posted May 6, 2015 Share Posted May 6, 2015 That would be a question for Paul Link to comment Share on other sites More sharing options...
Swampy442 Posted May 6, 2015 Share Posted May 6, 2015 Depends on your ECU, what are you running? If its stock with an FCD it would be advisable Id say. Link to comment Share on other sites More sharing options...
mellonman Posted May 6, 2015 Share Posted May 6, 2015 as above , you could take it out but you would need to see what sort of boost they make with it out and if your afr and timing is correct , so you could just book some dyno time to tell with a mapper listening for knock and watching afr's Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 7, 2015 Share Posted May 7, 2015 Totally dependent on whether the wastegate port is enlarged to allow more bypass exhaust gas flow than the stoc k ones, and the desired maximum boost. Given casting limitations with the stock turbine housings increasing flow while maintaining a reliable seat for the flap valve may be difficult / impossible. Link to comment Share on other sites More sharing options...
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