Vehicle & Technical > Discovery

Blowing exhaust and back pressure

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muddyjames:
I have been told that if a diesel car doesnt have an exhaust it wont run at all as there is no back pressure. I know my exhaust has a few ponts it is blowing from but not bad enough to fail mot. Will this reduce the engine power and economy or was my mate talking rubbish?

muddysteve:
when the downpipe broke on my clio the other day it was bloody noisey but did run, it was a pig to start though (1.9 normaly aspirated)

my rangie 200tdi when the exhaust fell off just past the 1st silencer it wasnt too noisey and went like stink (was tempeted to keep it like it)

so to sumarize, your mate was talking sense as alot of petrol engines and normaly aspirated diesels need a bit of back pressure but a tdi wants as little back pressure as possible

extreme90:
as little back pressure as u can so tubby spins up alot quicker  :wink:
mine a straight through 65mm, no silencers  :lol:
danny

muddyjames:
So when I get a proper exhaust on with no holes it will go slower very slightly :(

I have also been told a 110 exhaust will fit my disco and easier to fit or something.

extreme90:
unless theyre gr8 big whacking holes ur never going to no
u need half the exhaust to  be missing really too notice any difference
danny

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