suprarob Posted May 10, 2002 Share Posted May 10, 2002 Hi I quit fancy a blitz exhaust my supra is totaly standard, just by changing the exhaust how much more power would I get and is the induction kit worth doing Quote Link to comment Share on other sites More sharing options...
Alex Posted May 10, 2002 Share Posted May 10, 2002 10-30hp is all you'll gain. Head turning sound is its own reward! Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 10, 2002 Share Posted May 10, 2002 Just by changing the cat-back exhaust section you will gain some power but only a small amount, estimate 6-9BHP. The best thing to do is to get a cat replacement pipe and get rid of those damned cat's...... Good choice on exhaust though, the Blitz Nur Spec is a lovely exhaust and very well made. Damn somebodies nicked me old avatar, didn't even get chance to select it........ Quote Link to comment Share on other sites More sharing options...
suprarob Posted May 10, 2002 Author Share Posted May 10, 2002 Sorry I nicked your avatar, you can have it back if you like? I thought if Iremoved both cats the supra would fail the MOT how much power gain just removing one? Quote Link to comment Share on other sites More sharing options...
Alex Posted May 10, 2002 Share Posted May 10, 2002 Originally posted by suprarob Sorry I nicked your avatar, you can have it back if you like? I thought if Iremoved both cats the supra would fail the MOT how much power gain just removing one? If you remove the cats you will fail the MOT To pass the MOT by putting them back on for that day...warm them up and job done...if your car is between 93 and 95 and is J-spec then the MOT station COULD pass it without putting the cats back in. If you take out the 1st cat (most restrictive) 40hp inc the cat back exhaust. Take out both 60-80hp. You've reached the max for j-spec fueling. If your's is UK spec then your a luck lucky man! Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 10, 2002 Share Posted May 10, 2002 No problem about the avatar, my mate Arnold is helping me out. If you remove both CAT's chances are your car will defenitely fail the MOT, but hey the MOT only comes once a year I notice you have a UK spec so you would have no over-boost problems if you remove both CAT's. Defenitely the way to go. The CAT's are the biggest restriction in the whole exhaust system and also contribute a lot of heat to the turbo area. Chris Wilson produces CAT removal pipes and i think they are £150 each, so for both you would be looking at £300 investment for approx 25 - 30 BHP increase. If you do the whole lot in one go, including Nur-spec, i guess you can expect an increase of between 35 - 40BHP. But the sound will be gorgeous and one of the biggest benefits will be the turbo's will spool quicker. Go on, you know it makes sense. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 10, 2002 Share Posted May 10, 2002 Originally posted by Alex Holdroyd If you take out the 1st cat (most restrictive) 40hp inc the cat back exhaust. Take out both 60-80hp. 60 - 80hp increase for removing cats and replacing exhaust ? So a UK spec would reach 400BHp ? I think you've been reading too many of those American sites Alex. Quote Link to comment Share on other sites More sharing options...
Alex Posted May 10, 2002 Share Posted May 10, 2002 Originally posted by Martin F No problem about the avatar, my mate Arnold is helping me out. If you remove both CAT's chances are your car will defenitely fail the MOT, but hey the MOT only comes once a year I notice you have a UK spec so you would have no over-boost problems if you remove both CAT's. Defenitely the way to go. The CAT's are the biggest restriction in the whole exhaust system and also contribute a lot of heat to the turbo area. Chris Wilson produces CAT removal pipes and i think they are £150 each, so for both you would be looking at £300 investment for approx 25 - 30 BHP increase. If you do the whole lot in one go, including Nur-spec, i guess you can expect an increase of between 35 - 40BHP. But the sound will be gorgeous and one of the biggest benefits will be the turbo's will spool quicker. Go on, you know it makes sense. Damn it Martin, stop being so conservative!! Rob if you fit a Flux Capacitor you'll really make some power!!! Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 10, 2002 Share Posted May 10, 2002 Originally posted by Alex Holdroyd Damn it Martin, stop being so conservative!! Rob if you fit a Flux Capacitor you'll really make some power!!! OK i'll crack open a few beers! Quote Link to comment Share on other sites More sharing options...
suprarob Posted May 10, 2002 Author Share Posted May 10, 2002 I can feel my credit card twitching as I write thanks for that, hope to see you guys at a future meet Quote Link to comment Share on other sites More sharing options...
JohnK Posted May 10, 2002 Share Posted May 10, 2002 I removed the cat on my cavalier turbo it was a K plate and had to have the cat test at the MOT got fed up with putting it back on every year............ BUT....... MOT man told me that if they cant read the engine number to identify it to the computer, they dont know what test it should have, so they run a non cat test. Personally I dont know if the supra will pass a non cat test, It should do. He told me they also have to run the non cat test on series 1 mondeos, something to do with 95% of them wouldnt pass the cat test even with a new cat! Quote Link to comment Share on other sites More sharing options...
Doughie Posted May 11, 2002 Share Posted May 11, 2002 I put my UK-spec through MOT with no cats and it *just* failed due to emissions. was marginal though. and you only need to put ONE cat back on to get it through. If you have a "nice" MOT man then you could always explain that you could put the cat back on, but it'll be coming straight back off again afterwards and see what he says.... UK-specs are fine with no cats - no overboost problems at all. you will need a TRL Performance UFCC fitted to allow the car to boost higher than 14psi-ish. Just taking the cats off or just changing the exhaust won't have much effect. you really need to do both to get the big benefit. Quote Link to comment Share on other sites More sharing options...
Adam_SG Posted May 11, 2002 Share Posted May 11, 2002 How much for this inc fitting..... know anywhere is the Oxford or Midlands that specialises in supras... Thx:p Quote Link to comment Share on other sites More sharing options...
Terminator Posted May 11, 2002 Share Posted May 11, 2002 It really is not a difficult job to do your self, take the whole system off and replace it. You just need good quality tools. Quote Link to comment Share on other sites More sharing options...
Alex Posted May 11, 2002 Share Posted May 11, 2002 Originally posted by Adam_SG How much for this inc fitting..... know anywhere is the Oxford or Midlands that specialises in supras... Thx:p Any exhaust centre will fit the parts for £20 or so..20-30 mins job done. This is Chris Wilson's e-mail address. Drop him a line to enquire about decat pipes. [email protected] Quote Link to comment Share on other sites More sharing options...
Adam_SG Posted May 11, 2002 Share Posted May 11, 2002 Not sure if i trust myself to do that, it would prob fall off down the road! Quote Link to comment Share on other sites More sharing options...
suprarob Posted May 11, 2002 Author Share Posted May 11, 2002 HI Doughie this VFCC thing is it some sort of fuel cut and boost controler if it is how far can you turn the boost up? If you can adjust the boost using this can you do it with the standard exhaust fitted or can I do this with a blitz boost controler once on the road to more power will I be able to stop is there a clinic for boostaholics ? Quote Link to comment Share on other sites More sharing options...
Adam_SG Posted May 11, 2002 Share Posted May 11, 2002 Thx i will order 1 pronto! Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted May 12, 2002 Share Posted May 12, 2002 Out of interest, does anybody know if there are any benefits of decating, (one or both), if you already have a boost controller and vfcc fitted? (set to cut at 1.25max) Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted May 12, 2002 Share Posted May 12, 2002 Yes, lower temperatures around the turbo\exhaust area and quicker spooling of the turbo's. Quote Link to comment Share on other sites More sharing options...
Terminator Posted May 12, 2002 Share Posted May 12, 2002 By removing both cats on a Jspec your will, dependant upon which pipe setup you use, get from 1.2 to 1.4+ without a boost controller. You will not get the boost controller to bring boost back down. Well not much, Alex posted about a slight redicution in levels using his controller and I think Leon cat set them up to get a bit of reduction. Quote Link to comment Share on other sites More sharing options...
Terminator Posted May 12, 2002 Share Posted May 12, 2002 Originally posted by suprarob HI Doughie this VFCC thing is it some sort of fuel cut and boost controler if it is how far can you turn the boost up? If you can adjust the boost using this can you do it with the standard exhaust fitted or can I do this with a blitz boost controler once on the road to more power will I be able to stop is there a clinic for boostaholics ? The VFCC raises the level at which the ECU cuts fuel on high boost. It does not raise boost but enables you to raise your boost with a degree of safety and without hitting fuel cut. The new levle is about 18 psi adjustable. Quote Link to comment Share on other sites More sharing options...
Doughie Posted May 12, 2002 Share Posted May 12, 2002 Suprarob just to add to what Phil said, the VFCC is not a boost controller and won't change the max. boost that your car currently develops. but it *allows* other performance mods (like free-flow exhaust, de-cat pipe, electronic boost controller, bleed valve) to work but moving the car's "fuel-cut" level higher. Fuel-cut is set at about 14psi on a mkiv supra and if (as stock) the car detects that turbo boost has reached 14psi, (about 0.9bar or so) then it simply cuts all fuel being injected into the engine which feels like a fairly dramatic bang / event. In effect it's a safeguard to stop the car overboosting. But the mkiv will happily cope with more than 14psi and so installing a £60 VFCC (also known as a fuel-cut defencer / defeater) will raise the level at which fuel-cut happens to about 18psi. you don't want to remove fuel-cut completely. The TRL Performance fuel-cut raises fuel-cut to roughly 18psi or so. So if you install a boost controller or take the cats off and fit a free-flow exhaust like the Blitz NUR spec then the car WILL hit fuel-cut (not nice) unless you fit a VFCC. One final thing - Jap-spec MKiv TT tend to give substantially more boost than UK-specs for certain mods like the exhaust / de-cat. But often they allow too MUCH boost which is defnitely not good. accepted sensible limit for boost on a mkiv is about 17-18psi. UK-spec cars have steel-bladed turbos which are a little tougher than the Jap-spec ceramic-bladed turbos which can suffer from what is known as "pottery failure" if too much boost is used. (ask Barry / JB ...) hope that all makes sense. Quote Link to comment Share on other sites More sharing options...
suprarob Posted May 12, 2002 Author Share Posted May 12, 2002 Thanks guys You,ve given me alot to think about I uped the boost on a gt4 and got fuel cut(not pleasant) going to need a boost gauge as well and that posers a whole set of new ideas/problems/questions I think I,ll just go and look at the blitz web sit again. Quote Link to comment Share on other sites More sharing options...
Justin Posted May 12, 2002 Share Posted May 12, 2002 I'm about to buy/fit one this week so I'll keep you posted. Quote Link to comment Share on other sites More sharing options...
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