Notts_TT Posted March 28, 2012 Share Posted March 28, 2012 When driving my bpu supra upto 4k it's really sluggish, first turbo whistles but it seems to take forever to get there in second even. Could my gain/spring rate on aem bc be part to play ??? When the second turbo kicks its rapid as hell but waiting for it to hit feels like a lifetime ?? Thanks Quote Link to comment Share on other sites More sharing options...
marc_p Posted March 28, 2012 Share Posted March 28, 2012 Just put it TTC fella, I had the same issue when I went BPU, faulty VSV is probably the problem but if it boosts well in TTC it should be easy to find out if its a VSV. Quote Link to comment Share on other sites More sharing options...
Notts_TT Posted March 28, 2012 Author Share Posted March 28, 2012 At 4000k it boost great and pulls like a train but if im at 3000rpm an floor it in 2nd its dreadful, boosts at 17psi after 4000k... What's the vsv do ?? And how can I see if it is that Thanks Quote Link to comment Share on other sites More sharing options...
mellonman Posted March 28, 2012 Share Posted March 28, 2012 look here http://mkivsupra.net/vbb/showthread.php?35926-The-sequential-system Quote Link to comment Share on other sites More sharing options...
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