Idrees Posted May 9, 2015 Share Posted May 9, 2015 Hi guysSome of you may have seen my other thread regarding low power output. I still haven't got to the bottom of the problem.I'll try to keep this short. Previous spec: WEPR Ram Horn TD04 kit / TiAL F38JP FMIC HKS Super DraggerSytec FPRGreddy Profec BEMB 225 BHP @ 1.05 bar, full boost at 4K RPMNew spec:WEPR F/F TD04 Kit / TiAL MVS JP FMIC modified so now rear entry on hot sideFujitsubo Power GetterStock FPR370cc InjectorsWalbro 255 lph pumpApexi AVC-REMBMapped couldn't get it past around 180 BHPThe problem is its now making full boost at 5K RPM, it feels like it wants to hit full boost earlier but something is holding it back at around 4K and delaying full boost til 5K. Below is a list of things I've checked and changed. New HKS plugsNew rotor arm and distributor capNew Magnecor leadsTiAL w/g sent for testing and given the all clearTurbo removed to check the w/g is welded shut properlyEMB removed and ran on low boostRefitted stock injectorsTried a different set of 370cc injectorsFitted original / unmodified JP FMIC AVCR removed and ran on w/g pressure onlyRestricted air intake Walbro pump is brand new so I don't see the issue there although I will try a different one as I'm running out of ideas. Next is to try a different turbo and maybe another wastegate just in case there is an issue with it but that's highly unlikely. Quote Link to post Share on other sites
RobSR Posted May 10, 2015 Share Posted May 10, 2015 Checked it hasn't jumped a tooth on the timing side of things? Quote Link to post Share on other sites
mikey4410 Posted May 10, 2015 Share Posted May 10, 2015 thats what was my issue recently,cams were out by just one tooth.made huge difference Quote Link to post Share on other sites
RobSR Posted May 10, 2015 Share Posted May 10, 2015 ^ lol thats quite major! How'd you manage that! Quote Link to post Share on other sites
mikey4410 Posted May 10, 2015 Share Posted May 10, 2015 just never knew about the dots,and now I do lol. made the inlet open late (so less fuel and air) and shut late (letting 25psi compression out of each cylinder) Quote Link to post Share on other sites
Idrees Posted May 10, 2015 Author Share Posted May 10, 2015 Timing belt hasn't been done recently so I highly doubt it's that, nothing internal has been opened up. It's mainly the turbo kit / IC / fueling that has been changed. Quote Link to post Share on other sites
RobSR Posted May 10, 2015 Share Posted May 10, 2015 (edited) It won't be the cams as they won't jump it'll only be like that if they have been removed. Its if the timing belt has jumped some teeth which can happen it may give you a similar problem. Check the vac line to your MAP isn't split to, again i had a similar issue on one of Si's before and it was caused by that. Edited May 10, 2015 by RobSR Quote Link to post Share on other sites
Idrees Posted May 11, 2015 Author Share Posted May 11, 2015 I'll add that to the list of things to check, I'll leave it til last though as I highly doubt it's done that as it was running perfect before changing the setup.All vacuum lines have been checked but I may start replacing them just to completely rule them out. Quote Link to post Share on other sites
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