najw Posted March 2, 2008 Share Posted March 2, 2008 Well my exhaust fell off while in Wales this weekend leaving about 3' of 2.25" OD downpipe. Driving home I felt like I had a lot more power at the top end of the rev range comfortably pulling from 50-80mph in 5th with more power seemingly on tap. Was I being fooled by the roar of the exhaust and whine of the turbo or are there genuine benefits to a straight through exhaust? If I made a replacement system with no silencer could I expect trouble at MOT time? Also why are exhausts always made of steel? Wouldn't it be possible to make something out of silicone in this day and age? Quote Link to comment Share on other sites More sharing options...
mmgemini Posted March 2, 2008 Share Posted March 2, 2008 On a Tdi you will get a noticable improvement in low down torque with a straight through no silencer exhaust. There shouldn't be an MOT issue as the turbo quietens everything down. I've heard a 90 Tdi with a full straight through systen and it wasn't noisy at all. mike Quote Link to comment Share on other sites More sharing options...
western Posted March 2, 2008 Share Posted March 2, 2008 I fitted a straight through pipe to my 110 last year, no problems at MOT time & it feels more drivable. Quote Link to comment Share on other sites More sharing options...
jules Posted March 2, 2008 Share Posted March 2, 2008 I've fitted a centre box replacment pipe on my D2 td5 and its a little quicker but the noise is driving me nutts so the old box will be going back on. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted March 3, 2008 Share Posted March 3, 2008 There's no problem with the MOT if you have a straight through system - the turbo keeps it quiet. People tend to keep at least one silencer (or the rear resonator) because the noise at higher revs is supposed to be annoying/too loud. Les. Quote Link to comment Share on other sites More sharing options...
Rizla 1 Posted March 3, 2008 Share Posted March 3, 2008 If it's to load your getting to old Quote Link to comment Share on other sites More sharing options...
mmgemini Posted March 3, 2008 Share Posted March 3, 2008 If it's to load your getting to old Nope. It gets better as you get older 'cos you go deaf so you need an exhaust you can hear mike Try was Lord Mayor of London. Can't died in the workhouse. Quote Link to comment Share on other sites More sharing options...
jules Posted March 3, 2008 Share Posted March 3, 2008 If it's to load your getting to old My RRC LSE 4.2 V8 has no middle box and I can lisnt to it all day long and still make me feel warm inside when I start it or just give it a little rev etc.. My TD5 D2 with a similar straigh through middle box pipe sound bad simple as that Quote Link to comment Share on other sites More sharing options...
MECCANO Posted March 3, 2008 Share Posted March 3, 2008 I believe this is straight through according to one of the mags: http://uk.youtube.com/watch?v=UIV89B44BbA Quote Link to comment Share on other sites More sharing options...
gaf lad Posted March 3, 2008 Share Posted March 3, 2008 wot do you think of the newsite neil. some good sections as long as it stay's dry kev Quote Link to comment Share on other sites More sharing options...
najw Posted March 3, 2008 Author Share Posted March 3, 2008 wot do you think of the newsite neil. some good sections as long as it stay's drykev Awesome site - possibly the most technical we've used. If it rains we're all in big trouble :ph34r: Quote Link to comment Share on other sites More sharing options...
gaf lad Posted March 3, 2008 Share Posted March 3, 2008 should make a good day. we use the site quite often for winch fundays. Quote Link to comment Share on other sites More sharing options...
Daan Posted March 3, 2008 Share Posted March 3, 2008 Have you thought about an exhaust with straight through silencers? This will give you a quiet exhaust with no power losses. I made mine with 2 straight through silencers (no baffles), based on a complete defender tdi and discovery tdi system, used one straight through silencer from both systems, and I find it as quiet as any standard TDI. I cant compare it with the baffled silencers, since I never ran it like that, but it is very quiet. Daan Quote Link to comment Share on other sites More sharing options...
will_warne Posted March 3, 2008 Share Posted March 3, 2008 I used a tiny straight through box on the 90 and it was pretty quiet. The differance in noise level between no silencer and tiny straight through silencer is huge. The impression I get with Tdi's is that the outright figures don't seem to be massivly effected by exhaust design (unlike a nat asp petrol engine) however a straight through system allows the turbo to spool up quicker helping pickup. Quote Link to comment Share on other sites More sharing options...
66gaza Posted March 3, 2008 Share Posted March 3, 2008 Mine sounds exactly like this http://uk.youtube.com/watch?v=SLEN2QdO4aM Gaza Quote Link to comment Share on other sites More sharing options...
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