4efteboost Posted August 6, 2015 Share Posted August 6, 2015 (edited) Ever since i have had my emanage remapped i get a chopping sound from my air filter at full boost and boost fluctuation at the same time, will fluctuate between 0.9 and 1.1 bar and will only do this on motorways or duel carriageways. On normal roads it drives amazingWhen its doing this the revs sorta bounce up the rev range 😐 afr's are bang on aswell sitting in the 11'sAnyone got any ideas? Edited August 6, 2015 by 4efteboost Quote Link to post Share on other sites
Matt1878 Posted August 6, 2015 Share Posted August 6, 2015 Have you spoke to whoever mapped the car? Quote Link to post Share on other sites
4efteboost Posted August 6, 2015 Author Share Posted August 6, 2015 Tried to ring but no answer at the moment Quote Link to post Share on other sites
4efteboost Posted August 6, 2015 Author Share Posted August 6, 2015 Spoke to my mapper and he thinks its either my boost controller or im getting surge Anyone used an evc 4 before and had to adjust the offset? Could be causing the problem Quote Link to post Share on other sites
karl. Posted August 6, 2015 Share Posted August 6, 2015 Sounds like this? >https://www.youtube.com/watch?v=nCj6Spwl1CU Quote Link to post Share on other sites
4efteboost Posted August 6, 2015 Author Share Posted August 6, 2015 Sort of but doesn't sound no where near as high pitched as that though, is it known for people to get surge on td04's as ive not heard of it beforePointing more towards my on the boost controller i think, turned it on today before starting car and got a loud buzzing from the solenoid which i have not heard before 😐 Quote Link to post Share on other sites
4efteboost Posted August 9, 2015 Author Share Posted August 9, 2015 Don't think its surge as i went out yesterday and did not sound anything like that video and seems to be more like a slight pulsating sensation at WOT. got a hks evc 4 and think it could be something to do with it not working properly, i tried cleaning out the solenoid and replacing o rings inside it but still got same problem. when i turned the evc off completely it would boost to 0.6 bar perfect with no pulsating on just wastegate pressure but when i turned it back on would pulse straightaway even at low boost which is 0.66bar. it was set up on the rollers when i had it mapped via its learning mode and don't know if this could be a problem as its not under full load like on a motorway? has anyone had this sort of problem before with a boost controller? any help if appreciated as this is driving me insane trying to figure this out atm! Quote Link to post Share on other sites
adzy Posted August 9, 2015 Share Posted August 9, 2015 Could it be with your car being mapped and running different boost you maybe need to adjust your dumpvalve? As its maybe only releasing some air and your getting a smaller amount of surge? Quote Link to post Share on other sites
4efteboost Posted August 9, 2015 Author Share Posted August 9, 2015 Don't have a dump valve and has been running 1 bar boost since mapping, only tried it on low boost to see if the same problem occurred Quote Link to post Share on other sites
karl. Posted August 9, 2015 Share Posted August 9, 2015 I had the same thing you are describing once I had one of them manual boost controllers with a spring inside it. The wastegate would of opened and closed and sounds like the turbo is pulsing. Weird noise Quote Link to post Share on other sites
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