Geezabloke Posted April 7, 2003 Share Posted April 7, 2003 Should i go for full decat.............or keep one cat and fit a boost controller, cold plugs and fuel cut chip? Which would be the most reliable and most beneficial in raising the low down pull on a UK TT? Just need some guidance as a bit new to it all.......... Dave Quote Link to comment Share on other sites More sharing options...
Thorin Posted April 7, 2003 Share Posted April 7, 2003 Real men don't have any cats. /runs for cover Quote Link to comment Share on other sites More sharing options...
Alex Posted April 7, 2003 Share Posted April 7, 2003 I'm assuming you've spent ages using the search button for the pros and cons of De-catting a UK Supra...as it has been covered once or twice.... well if re-fitting it for the MOT is too big a problem then fair enough, otherwise there is no reason not to de-cat a UK car... Quote Link to comment Share on other sites More sharing options...
Steve W Posted April 7, 2003 Share Posted April 7, 2003 One thing.... I used a ONE-piece down-pipe, replacing both cats with a SINGLE pipe. That looks lovely / less bolts etc. = great. HOWEVER, I can't put ONE cat back in (IF I wanted/needed to!?) I should have (may STILL) get a TWO-piece down-pipe so that I can put just the lower/second cat in (easier than top cat and EITHER will pass MOT easily). Just a minor point, but.................. BUT............. BOTH CAT'S OUT ! ! ! ! ! Quote Link to comment Share on other sites More sharing options...
Jake Posted April 7, 2003 Share Posted April 7, 2003 Originally posted by Steve W I used a ONE-piece down-pipe, replacing both cats with a SINGLE pipe. HOWEVER, I can't put ONE cat back in (IF I wanted/needed to!?) Is the one piece decat downpipe harder to fit than the usuall two stage job then? I mean, you'll be swapping straight back to no cats after the MoT test anyways, right? Oh, and where can these de-cat conversion pipes be purchased? How long do they take to install? (assuming not a complete muppet) Any special tools req'd to fit? -- Dunk 657 '93 J-Spec TT, Auto, Std Mechanically, Bomex Kit Quote Link to comment Share on other sites More sharing options...
Brian Jackett Posted April 8, 2003 Share Posted April 8, 2003 Full De Cat - No question. Replacing one cat (as long as you go for two piece) for the MOT once a year is nothing compared to the rest of the years fun with No cats. Quote Link to comment Share on other sites More sharing options...
Andrew Posted April 8, 2003 Share Posted April 8, 2003 Still deciding this one for myself too. Some great posts if you look in search. Personally I'm a bit of a sound freak, common sense says leave cat1 in, my heart wants full decat Quote Link to comment Share on other sites More sharing options...
Steve W Posted April 8, 2003 Share Posted April 8, 2003 Putting the 1-Piece on is exactly the same as putting a 2-Piece on......(well, 2 bolts less, but doesn't really matter) BUT, it's when it comes to putting ONE cat back in.... I would have to put BOTH back....that means getting up to the Turbo end bit:mad: If you have the 2-Piece pipe, you can just put the second/lower cat' back in which means just the 'easier' joins UNDER the car. No big AG' for once-a-year, just a thought when you're buying it mate....? ! ? ! ( I DON'T need to put the cat' back in.... while I'm going to my usual MOT station:p but if I get an UNfriendly one it's a tad more AG' with my 1-Piece.......mak sense? ) FatS. Quote Link to comment Share on other sites More sharing options...
Steve W Posted April 8, 2003 Share Posted April 8, 2003 1-piece replacement pipe...... LIKE MINE (Mongoose one):- Quote Link to comment Share on other sites More sharing options...
Steve W Posted April 8, 2003 Share Posted April 8, 2003 2-piece pipes...... like most of the others ? ?:- Quote Link to comment Share on other sites More sharing options...
Sharpie Posted April 8, 2003 Share Posted April 8, 2003 Get them out Dave Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted April 8, 2003 Share Posted April 8, 2003 "Wont somebody pleeeeeease think of the Children!" Quote Link to comment Share on other sites More sharing options...
Steve W Posted April 8, 2003 Share Posted April 8, 2003 we ARE ! ! Once de-catted, the Soop is far more capable of suckin' up ALL unsupervised youths:moo: Quote Link to comment Share on other sites More sharing options...
Alex Posted April 8, 2003 Share Posted April 8, 2003 Originally posted by Andrew Still deciding this one for myself too. Some great posts if you look in search. Personally I'm a bit of a sound freak, common sense says leave cat1 in, my heart wants full decat You've got a J-spec there are other things to consider. UK's don't overboost so the only issue is swapping pipes at the MOT. Geeza, Just get 2x CW de-cat pipes and a catback exhaust. Its tried and tested - works fine. Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted April 8, 2003 Share Posted April 8, 2003 DON'T DO IT. My experience of a full de-cat was an out of control boost and a big wheel-spin problem. On my J-spec car it made the power delivery too severe for everyday driving. My personal opinion only here, is that a boost controller is the only way to go. I get the same power as a decat car but it's controlable and you can dial it down when the roads are wet or the air temperature is low. My verdict - highly over-rated. Quote Link to comment Share on other sites More sharing options...
Alex Posted April 9, 2003 Share Posted April 9, 2003 This thread is about a UK CAR!!!!!!! Not a J-spec.... FFS can anyone read anymore??? benefits on a UK car = Less Lag Lower EGT's - even with the higher boost More boost - About 1.1-1.2bar detractors = Have to re-fit at least 1 cat for an MOT Fuel consumption increases Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted April 9, 2003 Share Posted April 9, 2003 Is the UK car THAT different to the J-spec? Quote Link to comment Share on other sites More sharing options...
Mid_lifecry_sis Posted April 9, 2003 Share Posted April 9, 2003 Good thread, one of many on the subject... I have left mine in due to conversation surrounding piston concerns after a while if they are both removed > I must find out why.. perhaps due to over boosting? Chris Wilson sells the decat pipes, I may purchase. In the mean time I have a GREDDY fuel cut defencer which is brand-new but is not programmable and therefore for those with electronic boosters in mind > aka another £1400! I'll take £75, was £95 new. In the mean time if anyone can tell me where, and how much the programmable defencer is which cut's 19 PSI (what is that?> 1.2 bar) I would be very grateful. Remember seeing it discussed in a thread. With one CAT removed and running a hyper Muff, I hit 1 bar and fuel cut. Quote Link to comment Share on other sites More sharing options...
Sharpie Posted April 9, 2003 Share Posted April 9, 2003 Originally posted by John Packham Is the UK car THAT different to the J-spec? John, I have a UK TT - Pulled both cats out for CW pipes and put a Hiper on = 0.91 bar. I could not hit fuel cut! Quote Link to comment Share on other sites More sharing options...
Alex Posted April 9, 2003 Share Posted April 9, 2003 Originally posted by John Packham Is the UK car THAT different to the J-spec? yes I believe its all in the wastegate and exhaust sizing/construction....sorry about earlier, got out of the wrong side of the bed, and the wall was none too forgiving... Quote Link to comment Share on other sites More sharing options...
ad500 Posted April 9, 2003 Share Posted April 9, 2003 Until recently i was under the impression that i had a straight through exhaust. Took the car for an MOT and had Leon put the rear silencer on it beforehand. Only while we were under the ramp did he notice that the front silencer pipe was in place but the internals had been removed giving no cats without the proper pipe. This is either ingenious as you have effectively a straight through exhaust allowing easy connection of the rear cat once a year (passed MOT fine) or a total bodge. Any opinions?? Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted April 9, 2003 Share Posted April 9, 2003 Alex - No worries mate. I realised I'd posted J-spec info against a tech query on UK, but this whole decat business gets to me. My car was undriveable with both cats out, the second turbo came in at 1.1bar like a light switch and I spent most of my driving lifting off at 4000 just to keep traction. Being an auto, it changed up as soon as I lifted. I've put the second cat back in and it's fine. Anybody want to buy a CW 2nd decat pipe? Quote Link to comment Share on other sites More sharing options...
Mid_lifecry_sis Posted April 9, 2003 Share Posted April 9, 2003 john - how much - i may like to try? Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted April 9, 2003 Share Posted April 9, 2003 Mid'lifecry'sis £100 to you (£160 new) and it's done 1000 miles (mostly sideways:eek: ) email me [email protected] Quote Link to comment Share on other sites More sharing options...
Thorin Posted April 9, 2003 Share Posted April 9, 2003 Originally posted by John Packham Alex - No worries mate. I realised I'd posted J-spec info against a tech query on UK, but this whole decat business gets to me. My car was undriveable with both cats out, the second turbo came in at 1.1bar like a light switch and I spent most of my driving lifting off at 4000 just to keep traction. Being an auto, it changed up as soon as I lifted. I've put the second cat back in and it's fine. Anybody want to buy a CW 2nd decat pipe? Can't see why you were having that much trouble if you were only hitting 1.1bar (I hit 1.45 before restrictor plate). And surely if using manual mode your gearbox wouldn't change up? Quote Link to comment Share on other sites More sharing options...
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