Stewart10 Posted January 13, 2011 Share Posted January 13, 2011 Can anyone tell me what decatting is please? I understand it means taking off the Catalyctic Converter or something but how easy is that to do on an N/A and will it give it a bit more poke? Or just make it drink more fuel and suffer mechanical problems? Quote Link to comment Share on other sites More sharing options...
abtin90 Posted January 13, 2011 Share Posted January 13, 2011 Decatting involves removing the catalytic convertors. There are two decats though you'll prob need to leave at least one of them on for your MOT emissions test. You can always take both off and put them back on before your next MOT test. there's a thread on MOT questions started by another member graham s which has got some great info on going through an MOT with decats It's a relatively easy job... In regards to performance it will improve it greatly however it will also make it a lot louder which can be either good or bad depending on what your preference is. Talk to Paul whiffin at garage whifbitz as he sells them. I'm not sure about this part but I think you have to also declare it to your insurance or you can say you weren't aware of the mod when you got the car which is what a lot of people do but I personally wouldn't recommend doing so. It's an upgrade that most recommend. Quote Link to comment Share on other sites More sharing options...
Homer Posted January 13, 2011 Share Posted January 13, 2011 It means removal of the stock catalyict convertors. On an NA it is quite simple, the 1st and 2nd cat can simple be removed and replaced with decat pipes. The stock cat temp sensor mounted to the 2nd cat just needs to be tied out of the way or cut off. One recommendation is to have a local exhaust centre do this for you rather than DIY, the main exhuast studs can snap and can be easily replaced by those places, a little more difficult if you are at home and don't have the tools.. It will make the exhaust a little noisier, if you have an aftermarket exhaust it can make it very noisy indeed. Some say that it gives a few more HP, but I've never seen anyone prove it with a dyno result, it could be 10bhp at the top end, at the most optimistic. It will loose torque in the lower and mid range, but the noise will tell you different. It certainly won't cause any mechanical problems and you won't see any real world difference in fuel consumption. Edit, someone beat me to it, but I will add that an NA can pass the emissions test easily without any cats and a stock exhaust. Quote Link to comment Share on other sites More sharing options...
JakeG Posted January 13, 2011 Share Posted January 13, 2011 I recently done it on my NA mate, don't need cats for Mot on NA's for some reason as they don't no it exists or something like that, it made my throttle repsponse a lot sharper, makes it loud as fook and gives a lovely back fire when lifting off, all in all it was a good mod IMO Quote Link to comment Share on other sites More sharing options...
abtin90 Posted January 13, 2011 Share Posted January 13, 2011 this thread explains how you can pass without cats http://www.mkivsupra.net/vbb/showthread.php?214650-MOT-questions-and-queries-answered... Quote Link to comment Share on other sites More sharing options...
Stewart10 Posted January 13, 2011 Author Share Posted January 13, 2011 Cheers guys, i'm not sure my neighbours are going to approve of this! Quote Link to comment Share on other sites More sharing options...
conan Posted January 13, 2011 Share Posted January 13, 2011 I recently done it on my NA mate, don't need cats for Mot on NA's for some reason as they don't no it exists or something like that, it made my throttle repsponse a lot sharper, makes it loud as fook and gives a lovely back fire when lifting off, all in all it was a good mod IMO Who done it? and where are they located. I bumped into a blue TT with cream interior in a garage on the Antrim Road Belfast and he told me his name and to give him a call but like a tool I forgot it, Quote Link to comment Share on other sites More sharing options...
JakeG Posted January 13, 2011 Share Posted January 13, 2011 Who done it? and where are they located. I bumped into a blue TT with cream interior in a garage on the Antrim Road Belfast and he told me his name and to give him a call but like a tool I forgot it, SSI(supra specialists Ireland) located just outside nutts corner, there the only people you could trust with your supra over here, I can pm you there number if you wish mate Quote Link to comment Share on other sites More sharing options...
conan Posted January 13, 2011 Share Posted January 13, 2011 Yeah please mate pm the number, thats the man, I've been looking out for him for ages. Quote Link to comment Share on other sites More sharing options...
Abz Posted January 13, 2011 Share Posted January 13, 2011 SSI(supra specialists Ireland) located just outside nutts corner, there the only people you could trust with your supra over here, I can pm you there number if you wish mate I second that all the way from London Quote Link to comment Share on other sites More sharing options...
neo2810 Posted January 13, 2011 Share Posted January 13, 2011 Ask different folk an you'll get different opinions but from my own experience I bought my NA stock and got the following upgrades added together: Custom built racing exhaust manifold, custom built double decats, custom exhaust and backbox with small silencer (sounds awesome, not too loud), custom induction arm and filter, royal purple oil change (engine and gearbox) and iridium spark plugs. I could feel an instant improvement in both power and response when I collected it. I also found my consumption went from 19-20mpg to 24mpg. Stuck it on a RR a week later and it showed 245bhp at engine and 205whp. Unfortunately I didn't have it dyno'd before the changes but most stock NA's show between 205-210bhp so you make up your mind whether it's worth the cost. All that hit me for £1100 (although that also included a rocker gasket change). Quote Link to comment Share on other sites More sharing options...
stevie_b Posted January 13, 2011 Share Posted January 13, 2011 All that hit me for £1100 (although that also included a rocket gasket change). I presume you mean "rocker gasket": if not, I might need to investigate the "Rocket Mod" for my supra. Quote Link to comment Share on other sites More sharing options...
neo2810 Posted January 13, 2011 Share Posted January 13, 2011 I presume you mean "rocker gasket": if not, I might need to investigate the "Rocket Mod" for my supra. Ah, iPhone typo, fat fingers, edited Quote Link to comment Share on other sites More sharing options...
Thorin Posted January 13, 2011 Share Posted January 13, 2011 Decat on an NA is offensively loud with an aftermarket exhaust... Quote Link to comment Share on other sites More sharing options...
Stewart10 Posted January 17, 2011 Author Share Posted January 17, 2011 Well I found out in the end that mine is already decatted!!! lol Quote Link to comment Share on other sites More sharing options...
KamaSupra Posted January 17, 2011 Share Posted January 17, 2011 well i found out in the end that mine is already decatted!!! Lol LOL Quote Link to comment Share on other sites More sharing options...
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