Wilkinsonp Posted April 1, 2002 Share Posted April 1, 2002 Following a blat the other day I've noticed that the exaust note has changed (its sounds blowish)and much quiter than usual also there seems to be much less engine braking when I change down (I'm having to use the brakes alot more now) it still seems to accelarate ok but feels much smoother than before and less growly any Idea's why or what ? Pete Link to comment Share on other sites More sharing options...
Bob Corb Posted April 1, 2002 Share Posted April 1, 2002 Haven't got any firm solutions, but was wondering if the cam timing could have slipped? The performance would drop off and it can make small changes to the engine note. I did notice a difference when I changed the cam belt in the wifes car and found it to be two teeth out. BC Link to comment Share on other sites More sharing options...
F355GTS Posted April 1, 2002 Share Posted April 1, 2002 Pete Have you got a cat if so it may have failed if not could be the exhaust baffles failing both might cause reduced back pressure which could show the symptoms you're having Mark Link to comment Share on other sites More sharing options...
Wilkinsonp Posted April 1, 2002 Author Share Posted April 1, 2002 Just been out for another blat today and I think its the exaust baffels or the cat no cat smell today at all and theres always been a notable smell before...also a notable internal rattle some where in the system off to Caterham tomorrow to have it looked at I think. thanks all Pete Link to comment Share on other sites More sharing options...
dino ferrana Posted April 1, 2002 Share Posted April 1, 2002 If you go on a driving course with "Hirstute" Hugh Noblett he will tell you off for using your engine to brake! Use the brakes more lad! Link to comment Share on other sites More sharing options...
murph7355 Posted April 1, 2002 Share Posted April 1, 2002 Pete How old is the car? Pre-98 you don't need one. And I've heard they're not all that cheap to replace...possible angle anyway. Link to comment Share on other sites More sharing options...
Wilkinsonp Posted April 3, 2002 Author Share Posted April 3, 2002 Andy, Found the problem the silencer is leaking badly when hot all round the weld where the tail pipe fits in to the silencer hence blowie sound and less back pressure and rattle ...strange thing though no black smutt round the broken weld like I would expect..maybe thats due to the cat keeping things clean... It's a 97 so could do as you suggest and go for the no cat option at some point, does any one know if you lose much power by having a cat I know the standard exuast is a bit restrictive in any event ...and the external 4-2-1 system is better especially if I intend doing some tuning at some point, I know from experiance (company cars) the vauxhall sri cav lost much of its guttsy feel when they started turning them out with cats fitted as standard and even when it was given the 16v treatment. do you know the price of a 4-2-1 compared to standard 4-1 system cheers Pete Link to comment Share on other sites More sharing options...
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