HeMan Posted November 2, 2015 Share Posted November 2, 2015 Hello all,I have just had a Powerspeed 4-2-1 fitted to my 1.8 k-series. It has been through DVA and has been dynoed at 180bhp. With the old pipes I have been to Bedford and others and never had any noise problems at all. Powerspeed said the new pipes would sound different but be no louder and they measured it at about 1m at 6,000rpm and said he saw 97db before I left.However, recently at Donington during a 98db limit day, I tripped the track-side sensors at 98.8db! I am not sure how they managed to measure 98.8db from a track-side distance when Powerspeed recon it was only 97db up close? It does sound deeper, not offensively loud as such, but louder than the old pipes in my view.The question is, what are my options at this point?Take it back and get Powerspeed to do something (what)?Re-pack it with Acousta-Fil Boa or something?Do the DB Killers work (even if just in my toolbag as an emergency fix if it comes to it)? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted November 2, 2015 Member Share Posted November 2, 2015 Who fitted it? Powerspeed?I'd try and get it quietened by whoever did the work. No blame or legal stuff at this point, but at which stage was the intended sound level discussed and specified?Jonathan Link to comment Share on other sites More sharing options...
SM25T Posted November 2, 2015 Share Posted November 2, 2015 Did DVA make some changes after the new exhaust was fitted ? Link to comment Share on other sites More sharing options...
HeMan Posted November 2, 2015 Author Share Posted November 2, 2015 Yes, Powerspeed fitted it themselves (well Fast road conversions or whatever it is they call themselves, but I think thats the same place isn't it?).Nope, DVA did their bit back in 2010. I did visit raod'n'track for a mapping afterwards though. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted November 2, 2015 Member Share Posted November 2, 2015 I'd talk to Powerspeed directly and ask them what they can do to make it quieter.Jonathan Link to comment Share on other sites More sharing options...
HeMan Posted November 2, 2015 Author Share Posted November 2, 2015 I did, and to be fair they have asked me to drive it back down, but they made a comment that they would look at induction noise and cam timing and gave the impression they didn't think it could possibly be the exhaust. I am happy to do it, but its another day off work and a lot of driving, so I wanted to know there would be something to do when I get there... Link to comment Share on other sites More sharing options...
SM25T Posted November 2, 2015 Share Posted November 2, 2015 The induction noise can be a very significant part of the overall noise level. Did the mapping change the setup of the engine ..... if so, that is obviously outside the control of Powerspeed. Link to comment Share on other sites More sharing options...
HeMan Posted November 2, 2015 Author Share Posted November 2, 2015 Yeah true, but that shouldn't have changed should it (i.e. due to a new exhaust and a re-map)?My feeling is the noise change is coming from my left ear and is exhaust noise, not the right, where the intake is. I also have a black plastic box over the intakes which I assume is to keep them quiet. I am no expert though... Link to comment Share on other sites More sharing options...
Mankee Posted November 2, 2015 Share Posted November 2, 2015 I'd repack it with Acousta-Fil Boa. RedCat7 had good results over the standard Powerspeed sound deadening material:http://www.lotus7.club/forum/techtalk/which-exhaust-packing Link to comment Share on other sites More sharing options...
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