Sparky Posted July 29, 2007 Share Posted July 29, 2007 Um I tried to search for this but couldnt find anything usefull! Uk spec TT is 320bhp right, and the Jspec is 270? Is 270 restricted from 320 or is that the actual power put out? Its only i know some Jspec cars can be delimited back to the original bhp! Link to comment Share on other sites More sharing options...
jamesmark Posted July 29, 2007 Share Posted July 29, 2007 Urban myth, UK is 326 stock iirc and J-Spec is 300-326. It is bollocks that the J-spec only has 270bhp, it was a gentlemans aggreement between all the big Jap car makers to limit power to 270ish bhp but none actually stuck to it if it was over they still put the power to 270 ish, I think thats how the story goes. Link to comment Share on other sites More sharing options...
Sparky Posted July 30, 2007 Author Share Posted July 30, 2007 Thanks Jamesmark. You've answered me perfectly! Link to comment Share on other sites More sharing options...
r1george Posted July 30, 2007 Share Posted July 30, 2007 The UK car's ARE more powerful then the J-spec car's, they have slightly bigger BETTER steel turbos not ceramic one's like the J-spec's also the injectors are bigger 550's instead of 440's plus the cam's are a sportier profile on UK cars. This mean's if they go BPU a UK car can make more power for the same mod's and the standard turbo's on UK car''s are much stronger so can take more boost equalling more power. Having said this I don't think there's much in ON ROAD performance between the 2 car's but the UK car's have the edge. I'm not bias because I run a J-spec there just the fact's:( Link to comment Share on other sites More sharing options...
jamesmark Posted July 30, 2007 Share Posted July 30, 2007 Also the UK is heavier than the J-Spec. This is why there is not much difference. Link to comment Share on other sites More sharing options...
robin Posted July 30, 2007 Share Posted July 30, 2007 Also the J spec turbos are ment to be faster spooling but I dont know if there is really much difference. Link to comment Share on other sites More sharing options...
tDR Posted July 30, 2007 Share Posted July 30, 2007 The UK car's ARE more powerful then the J-spec car's, they have slightly bigger BETTER steel turbos not ceramic one's like the J-spec's also the injectors are bigger 550's instead of 440's plus the cam's are a sportier profile on UK cars. This mean's if they go BPU a UK car can make more power for the same mod's and the standard turbo's on UK car''s are much stronger so can take more boost equalling more power. Having said this I don't think there's much in ON ROAD performance between the 2 car's but the UK car's have the edge. I'm not bias because I run a J-spec there just the fact's:( Garbage. The J-Spec has the bigger turbos of the two. They are also ceramic so spool quicker making them the more responsive car. Power wise there's bugger all in it between the two models as standard. Going BPU is cheaper on a J-Spec because you don't need a boost controller to raise the boost. I don't have a problem with performance from my J-Spec car and don't know of any BPU UK Spec cars that are quicker Cheers, Brian. Link to comment Share on other sites More sharing options...
Jake Posted July 30, 2007 Share Posted July 30, 2007 The UK car's ARE more powerful then the J-spec car's, they have slightly bigger BETTER steel turbos not ceramic one's like the J-spec's also the injectors are bigger 550's instead of 440's plus the cam's are a sportier profile on UK cars. This mean's if they go BPU a UK car can make more power for the same mod's and the standard turbo's on UK car''s are much stronger so can take more boost equalling more power. Having said this I don't think there's much in ON ROAD performance between the 2 car's but the UK car's have the edge. I'm not bias because I run a J-spec there just the fact's:( Your 'facts' suck mate. Link to comment Share on other sites More sharing options...
Mike Posted July 30, 2007 Share Posted July 30, 2007 Is the injectors bit true then? Link to comment Share on other sites More sharing options...
tDR Posted July 30, 2007 Share Posted July 30, 2007 Yes, J spec has smaller injectors and milder cams to match the responsiveness of the ceramics. Link to comment Share on other sites More sharing options...
rob wild Posted July 30, 2007 Share Posted July 30, 2007 Turbo Spec's J-Spec CT20A (Ceramic) Turbine Size: 60mm/48mm (inducer/exducer) Compressor Size: 62mm/39mm (inducer/exducer) Turbine material: Ceramic Scroll area (mm^2): 600 A/R ratio: 0.42 UK Spec CT12B (Steel) Turbine Size: 52mm/44mm (inducer/exducer) Compressor Size: 58mm/39mm (inducer/exducer) Turbine material: Steel Scroll area (mm^2): 740 A/R ratio: 0.53 Link to comment Share on other sites More sharing options...
R Black Posted July 30, 2007 Share Posted July 30, 2007 Bottom line i dont think there is owt between the two on performance , however the UK is ultimately the better spec'd car, no question. P.S. r1george cool ride Link to comment Share on other sites More sharing options...
styggen82 Posted July 30, 2007 Share Posted July 30, 2007 I tested mine, a 98 vvti tt J-spec. had 320 hp, 485 Nm(engine) and about 275 hp on the wheels... and the car was stock exept the speed limiter was removed..... no cat back, nothing..... Link to comment Share on other sites More sharing options...
Jake Posted July 30, 2007 Share Posted July 30, 2007 the UK is ultimately the better spec'd car, no question. It's differently spec'd, no question. Whether that spec is "better" is a matter of opinion. Link to comment Share on other sites More sharing options...
r1george Posted July 30, 2007 Share Posted July 30, 2007 So apart from the turbo size issue which I got wrong, the rest of what I said was correct and ultimately the UK turbos are still the stronger and can take more boost pressure which means more power or am I still wrong. I don't think my comment are garbage as I said I drive a J-spec TT Link to comment Share on other sites More sharing options...
Jezz Posted July 30, 2007 Share Posted July 30, 2007 So apart from the turbo size issue which I got wrong, the rest of what I said was correct and ultimately the UK turbos are still the stronger and can take more boost pressure which means more power or am I still wrong. I don't think my comment are garbage as I said I drive a J-spec TT Not completely wrong. The UK turbo's are steel, yes. But anything over 1.2 bar on Either J-spec or Uk spec turbos is out of their efficiancy range. Ie, 1.4 bar on j-spec turbos will make them shit themselves. However 1.4 bar on Uk turbos wont destroy the blades, but will be out of the effiancy range of the turbo, so will just be blowing hot air into your intake. The only way I can explain the difference in UK power and J-spec power: J-specs are quick, UK specs are fast. I know what i mean in my own head. Link to comment Share on other sites More sharing options...
Jake Posted July 30, 2007 Share Posted July 30, 2007 So apart from the turbo size issue which I got wrong, the rest of what I said was correct and ultimately the UK turbos are still the stronger and can take more boost pressure which means more power or am I still wrong. I don't think my comment are garbage as I said I drive a J-spec TT You were right about the spec (steel turbine blades, 550cc injectors, different cam profile). Those things are facts. Stating the turbos are bigger, that they are stronger, that the UKs make more power for the same mods, that they can take more boost, isn't fact - it's just an opinion. Chris Wilson knows a bit about Supras See his comments about those super UK turbos in this thread. Link to comment Share on other sites More sharing options...
R Black Posted July 31, 2007 Share Posted July 31, 2007 It's differently spec'd, no question. Whether that spec is "better" is a matter of opinion. I was'nt specifically talking about just under the hood, there are many differences, bigger brakes fuel tank, heated seats different colour leather glass headlights etc etc etc, like i said no question Link to comment Share on other sites More sharing options...
tDR Posted July 31, 2007 Share Posted July 31, 2007 Plenty of question IMO. Bigger brakes - depends on the J Spec. Bigger fuel tank - not sure on that one but big deal regardless. Heated seats - big deal. Different colour leather - again depends on the J Spec. Glass headlights - true but I prefer my facelift J Spec lights. Now consider the flipsides, J Spec carries less weight = quicker on road performance. UK Spec cars tend to have done moon mileage and are very long in the tooth as a result. We've had these pointless UK vs. J Spec arguments on the forum literally thousands of times now. Neither can be named the outright better car 'FACT' - choose the one that tickles your fancy and get on with it. Link to comment Share on other sites More sharing options...
R Black Posted July 31, 2007 Share Posted July 31, 2007 Plenty of question IMO. Bigger brakes - depends on the J Spec. Bigger fuel tank - not sure on that one but big deal regardless. Heated seats - big deal. Different colour leather - again depends on the J Spec. Glass headlights - true but I prefer my facelift J Spec lights. Now consider the flipsides, J Spec carries less weight = quicker on road performance. UK Spec cars tend to have done moon mileage and are very long in the tooth as a result. We've had these pointless UK vs. J Spec arguments on the forum literally thousands of times now. Neither can be named the outright better car 'FACT' - choose the one that tickles your fancy and get on with it. Now from your point of view owning a vvti facelift in a IMO top colour now things blur together again IMO, YES the average UK spec is'nt in great nic & is rather high on mileage, any debate where there is debate is usually still open to debate. Confused no well i am good night. Link to comment Share on other sites More sharing options...
Jake Posted July 31, 2007 Share Posted July 31, 2007 I was'nt specifically talking about just under the hood, there are many differences, bigger brakes fuel tank, heated seats different colour leather glass headlights etc etc etc, like i said no question Here we go again with the "no question" rubbish. Your "no questions"s and "FACT"s are highly subjective. Who wants heated seats in a sports car? Who wants a massive fuel tank? Who wants beige leather? Who wants soft suspension and a heavy kerbside weight? Which of things things makes a UK spec desirable to you? None of them do to me. Link to comment Share on other sites More sharing options...
Jake Posted July 31, 2007 Share Posted July 31, 2007 Now from your point of view owning a vvti facelift in a IMO top colour now things blur together again His car isn't a VVTi. Link to comment Share on other sites More sharing options...
jamesmark Posted July 31, 2007 Share Posted July 31, 2007 The only thing I like about the UK spec is the brakes and the bonnet, as Jake said the rest is a bit erm ....................."peppery" Link to comment Share on other sites More sharing options...
R Black Posted July 31, 2007 Share Posted July 31, 2007 Link to comment Share on other sites More sharing options...
Nic Posted July 31, 2007 Share Posted July 31, 2007 The only thing I like about the UK spec is the brakes and the bonnet, as Jake said the rest is a bit erm ....................."peppery" The larger size (I hate the term UK spec as it is not accurate) brakes were fitted as standard on many J-spec Supras. Link to comment Share on other sites More sharing options...
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