ididntodit73 Posted February 6, 2009 Share Posted February 6, 2009 Hi all. I'm after some cats for my new build. The engine is a ls1/6 5.7. help needed please! Quote Link to comment Share on other sites More sharing options...
will_warne Posted February 9, 2009 Share Posted February 9, 2009 Hi all.I'm after some cats for my new build. The engine is a ls1/6 5.7. help needed please! Why???? Hot cat's don't like being submerged in cold water and you'll get better figures without them fitted. You won't pass an MOT without them fitted but there are ways around this. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 10, 2009 Share Posted February 10, 2009 Cats don't care that much, certainly not as much as real cats. I would ask why you need them at all unless the vehicle will be required to pass strict emissions tests? Certainly "race" cats just seem to be a licence to print money. Quote Link to comment Share on other sites More sharing options...
ididntodit73 Posted February 10, 2009 Author Share Posted February 10, 2009 I thought you need them for sva iva. And then the mot eventuallly i would have thought. Not certain tho so if anyone can shed any light on that it'll help. Have found a company called jetex who can supply them like but not sure on the costs yet!!! Ian Quote Link to comment Share on other sites More sharing options...
will_warne Posted February 10, 2009 Share Posted February 10, 2009 SVA / IVA you will need them. MOT you will need them. Depending on where you buy your engine it could well come with some OEM cats. 'A friend' uses a cat replacement pipe in his Lotus Elise and keeps the factory cat safe on the shelf for the once a year it's needed for the MOT. Saves having to replace it every few years and is good for performance. Yes, you could use expensive (you won't see change for £500) low density sports cats but they really aren't well suited to off road vehicles and will not be as effective as factory cats meaning a greater chance of emissions failure. Quote Link to comment Share on other sites More sharing options...
ididntodit73 Posted February 11, 2009 Author Share Posted February 11, 2009 Will, already have the engine, no cats came with it just headers. Think i'll try caontacting the engine supplier in america. Ian Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 11, 2009 Share Posted February 11, 2009 I'd pester the local exhaust supplier, most cats are one of a few basic designs with a specific bendy bit of pipe welded on to suit the car, ISTR a chappy with a J**p who got quoted a ludicrous amount of cash for a new cat, ended up buying a job lot of standard cats (minus the J**p specific pipe) for about 1/10th the price and punting them out to grateful owners for a small margin. As long as the tube size is right, I'd got with it - the LS isn't exactly going to notice being a HP or two down because of added restriction Quote Link to comment Share on other sites More sharing options...
will_warne Posted February 11, 2009 Share Posted February 11, 2009 I'd pester the local exhaust supplier, most cats are one of a few basic designs with a specific bendy bit of pipe welded on to suit the car, ISTR a chappy with a J**p who got quoted a ludicrous amount of cash for a new cat, ended up buying a job lot of standard cats (minus the J**p specific pipe) for about 1/10th the price and punting them out to grateful owners for a small margin. As long as the tube size is right, I'd got with it - the LS isn't exactly going to notice being a HP or two down because of added restriction Especially if the vehicle only makes one short journey a year with them fitted. Quote Link to comment Share on other sites More sharing options...
Daan Posted February 12, 2009 Share Posted February 12, 2009 SVA / IVA you will need them. MOT you will need them. Depending on where you buy your engine it could well come with some OEM cats. 'A friend' uses a cat replacement pipe in his Lotus Elise and keeps the factory cat safe on the shelf for the once a year it's needed for the MOT. Saves having to replace it every few years and is good for performance. Yes, you could use expensive (you won't see change for £500) low density sports cats but they really aren't well suited to off road vehicles and will not be as effective as factory cats meaning a greater chance of emissions failure. Based on what? An SVA build is a lowvolume type approval, emisions are not part of this, or at least not when I did it. Daan Quote Link to comment Share on other sites More sharing options...
T1G UP Posted February 12, 2009 Share Posted February 12, 2009 My gti makes lambda 1 without its cats. modern engines are cappable of meeting emmisions if all the emmisions bits are left on! heres a link but as soon as the mot's over remove the bloody things! http://cgi.ebay.co.uk/2-5-63-5mm-Race-Flow...A1%7C240%3A1318 Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 12, 2009 Share Posted February 12, 2009 Lambda is a measure of air:fuel ratio so I would hope all engines would be capable of meeting Lambda = 1 as that's the optimum point for combustion. The emissions that cats reduce so greatly are the other bits (CO2 / HC) which you simply will not pass without a cat if the test was designed for cat equipped vehicles - the cat on my Freebie disintegrated and the emissions were about 10x the limit so that tells you the difference the cat makes. However, as Daan said it really depends what the SVA test is going to require. Quote Link to comment Share on other sites More sharing options...
ididntodit73 Posted February 12, 2009 Author Share Posted February 12, 2009 well sean from north off road said i would need a cat for my sva/iva. but going down the local exhaust place sounds like a plan. Thanks Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 13, 2009 Share Posted February 13, 2009 well sean from north off road said i would need a cat for my sva/iva.but going down the local exhaust place sounds like a plan. Thanks Only VOSA can tell you if you'll need one really, it very much depends on what they make of your vehicle and what flavour of test it'll be in for. Quote Link to comment Share on other sites More sharing options...
jules Posted February 13, 2009 Share Posted February 13, 2009 My Race freelander 1.8 had race CAT it was fitted by Janspeed as part of my sponsership I don't know how much it cost but it always sailed through it's MOT's Quote Link to comment Share on other sites More sharing options...
ididntodit73 Posted February 13, 2009 Author Share Posted February 13, 2009 Thanks for all your replys. The vehicle should get a new reg. As don't really have a donor car. and as the axles are disco 2 transfer box disco 2, frame and chassis all new tubualar gearbox gm and the engine ls. Quite a mix and match!! Quote Link to comment Share on other sites More sharing options...
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