chrisda Posted December 29, 2004 Share Posted December 29, 2004 What is the first stage to if I want more boost of my original turbos? Boost controller, fuel cut defender, boost cut defender? Can somone fill me in.. Kind regards Chris Quote Link to comment Share on other sites More sharing options...
merckx Posted December 29, 2004 Share Posted December 29, 2004 Is your car a Japanese import? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 29, 2004 Share Posted December 29, 2004 Remove both cats and if it then hits fue cut buy and fit a fuel cut defender. Ideally you need to also fit colder plugs and a freer than stock flowing exhaust system. As these parts are all interdependent you should really fit them all at the same time. on a UK spec you may need some form of boost controller to further raise the boost. You won't on a healthy J-Spec car. I stock and supply everything you need by the way, but feel my advice is impartial Quote Link to comment Share on other sites More sharing options...
tbourner Posted December 29, 2004 Share Posted December 29, 2004 I believe his car was bought in UK, but is a j-spec import. So a decat and cat back exhaust with restrictor ring for about 1.2 bar max would be best. No need for a boost controller but maybe a boost gauge and as mentioned some colder plugs (I have NGK BCPR7ES). Make sure you use optimax or similar as well!!! Quote Link to comment Share on other sites More sharing options...
merckx Posted December 29, 2004 Share Posted December 29, 2004 It all really depends on how much you would want to spend. I would get the cat back exhaust first, something like a Blitz Nur Spec R. This will increase the boost and make it sound so much better . You don't have to buy anything else at this stage. The second stage would be to replace either one or both catalysts with a straight through pipe. But you will need the following: A boost gauge Restrictor ring to stop the boost going too high(if you replace both catalysts). A fuel cut defender (TRL are popular) Colder plugs- NGK are much cheaper than Denso. I got the cat pipes from Chris Wilson, he'll make sure you'll get the right stuff. Quote Link to comment Share on other sites More sharing options...
dude Posted December 29, 2004 Share Posted December 29, 2004 You NEED to go SINGLE !!!! Dude Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 30, 2004 Author Share Posted December 30, 2004 Is your car a Japanese import? Hi there... It is a japan import yes... Kind regards Chris Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 30, 2004 Author Share Posted December 30, 2004 Remove both cats and if it then hits fue cut buy and fit a fuel cut defender. Ideally you need to also fit colder plugs and a freer than stock flowing exhaust system. As these parts are all interdependent you should really fit them all at the same time. on a UK spec you may need some form of boost controller to further raise the boost. You won't on a healthy J-Spec car. I stock and supply everything you need by the way, but feel my advice is impartial HI there.. SHould I don´t need a boost controller on my jap-spec car? Why is that? regards Chris Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 30, 2004 Author Share Posted December 30, 2004 I believe his car was bought in UK, but is a j-spec import. So a decat and cat back exhaust with restrictor ring for about 1.2 bar max would be best. No need for a boost controller but maybe a boost gauge and as mentioned some colder plugs (I have NGK BCPR7ES). Make sure you use optimax or similar as well!!! The car is bought from the uk but it is a jap-spec yes. it is imported from there.. So i should just thake away the cat and set a 3-4" exhaust and then change my plugs. is the original plugs no good? Let me hear from u.. Chris Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 30, 2004 Author Share Posted December 30, 2004 Can I use a boost controller to control the boost so it´s not getting to high right? That is a easy way I think.. Regards Chris Quote Link to comment Share on other sites More sharing options...
tbourner Posted December 30, 2004 Share Posted December 30, 2004 A boost controller can only INCREASE the boost level, not stop it from increasing. If you decat with exhaust system on a j-spec the boost will go WAY above what you want it to, so you'll need a restrictor ring in the exhaust system. You should get a colder grade of plug from the stock ones as with increased boost you'll get increased engine temperatures. There are a lot of threads about plugs but the ones I mentioned are fine if you change them every 6000 miles or so. Quote Link to comment Share on other sites More sharing options...
asupracar Posted December 30, 2004 Share Posted December 30, 2004 If it’s a J-spec and you remove both cats and fit a performance exhaust the boost levels will rise to about 1.1-1.2 or more. This is because the j-spec cars use the cats to restrict boosts. The wastegate alone is not big enough to keep boost within safe limits. You will not need a boost controller but a restrictor ring in the exhaust to restrict the boost levels. alternatively you could just remove one cat? Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 30, 2004 Author Share Posted December 30, 2004 If it’s a J-spec and you remove both cats and fit a performance exhaust the boost levels will rise to about 1.1-1.2 or more. This is because the j-spec cars use the cats to restrict boosts. The wastegate alone is not big enough to keep boost within safe limits. You will not need a boost controller but a restrictor ring in the exhaust to restrict the boost levels. alternatively you could just remove one cat? ALright.. So where will I find a restrictor ring to the exhaust? How much would it cost? Easy to install? Everyone in sweden said that I need a boost controller and a boost cut defender or a fuel cut defender, maybe u must have that on a euro spec. How much power can I take out of my original jap-turbos then.. I have already 3,5" exhaust, apexi induction kit. regards Chris Quote Link to comment Share on other sites More sharing options...
asupracar Posted December 30, 2004 Share Posted December 30, 2004 You will need a FCD to override the ECU set fuel cut which occurs at around 1 bar. If you remove both cats then a restrictor ring will be needed! You can get one from Chris Wilson. Race and performance road car servicing and preparation in north Shropshire. Home / Work : 01948-841581 Mobile: 07971-952084 Please use direct e-mail, rather than PM's, thanks! [email protected] iam sure he would send you one Not an expensive job at all. You wont need a boost controller if the cats are out. You should see 1.1-1.2 bar depending on the size of the restrictor ring. Dont take your boost above 1.2 max. Your turbos life span will reduce with increase boost! Change your plugs to a colder set. NGK do some cheap ones. Use a higher octane fuel. Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 30, 2004 Author Share Posted December 30, 2004 You will need a FCD to override the ECU set fuel cut which occurs at around 1 bar. If you remove both cats then a restrictor ring will be needed! You can get one from Chris Wilson. Race and performance road car servicing and preparation in north Shropshire. Home / Work : 01948-841581 Mobile: 07971-952084 Please use direct e-mail, rather than PM's, thanks! [email protected] iam sure he would send you one Not an expensive job at all. You wont need a boost controller if the cats are out. You should see 1.1-1.2 bar depending on the size of the restrictor ring. Dont take your boost above 1.2 max. Your turbos life span will reduce with increase boost! Change your plugs to a colder set. NGK do some cheap ones. Use a higher octane fuel. Hi there... WHat is the boost on the original turbos on the jap-spec. IS there something better with the jap-turbos then the euro-turbos.. Let me hear from.. Chris Quote Link to comment Share on other sites More sharing options...
Clarkey Posted December 30, 2004 Share Posted December 30, 2004 Stock boost is 12psi .. 0.8Bar. My understanding was the JSpec & Euro-Spec Turbos boost to the same pressure. Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 30, 2004 Author Share Posted December 30, 2004 Stock boost is 12psi .. 0.8Bar. My understanding was the JSpec & Euro-Spec Turbos boost to the same pressure. yes but the euro spec is 320hp an the jap is 280hp Chris Quote Link to comment Share on other sites More sharing options...
carl0s Posted December 30, 2004 Share Posted December 30, 2004 yes but the euro spec is 320hp an the jap is 280hp Chris Jap Spec is ~320 bhp, Euro/US Spec is ~326bhp. In Japan there is a "Gentlemens Agreement" which says that no cars will be made with more than 280bhp. As this is just a gentlemens agreement, these gentlemen produce cars with more power, but officially state that the power is only 280bhp. This way it stops the BHP-wars that they were having, yet they can still produce more powerful cars. I think boost is the same, but J-Spec has lighter ceramic turbos which have a larger exhaust wheel (I think) and smaller compressor wheel (maybe I'm completely wrong), but anyway the Jap turbos spool more easily. Jap spec has different cam profiles as well. Jap has more torque lower down the rpm range. Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 30, 2004 Author Share Posted December 30, 2004 Jap Spec is ~320 bhp, Euro/US Spec is ~326bhp. In Japan there is a "Gentlemens Agreement" which says that no cars will be made with more than 280bhp. As this is just a gentlemens agreement, these gentlemen produce cars with more power, but officially state that the power is only 280bhp. This way it stops the BHP-wars that they were having, yet they can still produce more powerful cars. I think boost is the same, but J-Spec has lighter ceramic turbos which have a larger exhaust wheel (I think) and smaller compressor wheel (maybe I'm completely wrong), but anyway the Jap turbos spool more easily. Jap spec has different cam profiles as well. Jap has more torque lower down the rpm range. So ur telling me that it is 320 hp on a jap-spec car also. So there shouldn´t be any diffrent with the euro or the jap then. Alright but everyone here in sweden says other things that it is 280hp.. Fun hehe.... let me hear from u Chris Quote Link to comment Share on other sites More sharing options...
carl0s Posted December 30, 2004 Share Posted December 30, 2004 So ur telling me that it is 320 hp on a jap-spec car also. So there shouldn´t be any diffrent with the euro or the jap then. Alright but everyone here in sweden says other things that it is 280hp.. Fun hehe.... let me hear from u Chris It is officially stated as being 280bhp, because it is only sold in Japan, and in Japan cars can't officially be more than 280bhp. Independant Dyno tests have shown them to be closer to 320. It does have all the other differences though. 440cc injectors instead of 550cc. Smaller brakes, different cam profiles, 112mph limit etc. etc. Quote Link to comment Share on other sites More sharing options...
Clarkey Posted December 30, 2004 Share Posted December 30, 2004 Speaking of Dyno's ... I should get my car dyno-ed - I'd be interested to see what a JSpec - full-decat 1.25Bar pushes out. Quote Link to comment Share on other sites More sharing options...
Nic Posted December 31, 2004 Share Posted December 31, 2004 I was reading today in EVO mag that the gentleman's agreement will end shortly.... Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 31, 2004 Author Share Posted December 31, 2004 It is officially stated as being 280bhp, because it is only sold in Japan, and in Japan cars can't officially be more than 280bhp. Independant Dyno tests have shown them to be closer to 320. It does have all the other differences though. 440cc injectors instead of 550cc. Smaller brakes, different cam profiles, 112mph limit etc. etc. Are u sure that it is smaller brakes on the car? And OS giken clutch, is that a good mark? Regards Chris Quote Link to comment Share on other sites More sharing options...
chrisda Posted December 31, 2004 Author Share Posted December 31, 2004 It is officially stated as being 280bhp, because it is only sold in Japan, and in Japan cars can't officially be more than 280bhp. Independant Dyno tests have shown them to be closer to 320. It does have all the other differences though. 440cc injectors instead of 550cc. Smaller brakes, different cam profiles, 112mph limit etc. etc. Should it be better to change the injectors to 550 instead of 440 then maybe? or it dosn´t matter? Is there any other differences on the jap engine? kind regards Chris Quote Link to comment Share on other sites More sharing options...
carl0s Posted December 31, 2004 Share Posted December 31, 2004 Should it be better to change the injectors to 550 instead of 440 then maybe? or it dosn´t matter? Is there any other differences on the jap engine? kind regards Chris erm.. I'm not a technical person I'm afraid. I'm just parroting stuff I've learned from here. If you are going for a major power hike - for example a large single turbo, then you would upgrade your injectors so they could supply more fuel. I think with std turbos this won't be necessary. I actually thought that facelift tt (rz/gz) cars came with the larger UK (Euro/US) spec brakes, but I have seen a few for sale lately that had the smaller brakes. For a lot of people, UK-spec brakes is one of the first things on their upgrade-list because they are so much better. Other differences I don't know. Sure there are, but I couldn't tell you because Southpark is on. J-Spec has differences in the exhaust / fuel sensor area - it has a MAF instead of a MAP sensor, or the other way round. De-cat pipes for a Jap spec are different than UK/Euro spec. Search the site!! Also look at http://www.mkiv.com - it has a table of differences. _________ See - I don't always talk bollocks do I bollocks Quote Link to comment Share on other sites More sharing options...
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