pezzler Posted August 20, 2008 Share Posted August 20, 2008 would probably be a good idea to do other (boring) jobs first before hitting the bhp route. maybe get the car FULLY serviced (cambelt, lsd fluid, 'box oil, fuel filter etc), get the valve stem seals and turbo seals done, maybe replace the intercooler (if it hasnt already been done). get the car dyno'd in stock form, make sure its running sweet as a nut, then do the performance mods.....will probably save time, tears and money in the long run. these cars, however reliable, are cracking on a bit Quote Link to comment Share on other sites More sharing options...
tDR Posted August 20, 2008 Share Posted August 20, 2008 The standard power of a j spec TT is 320bhp. 280 is rubbish and was only claimed by Toyota because of said gentlemans agreement between the manufacturers limiting power to that amount at the time. I've had two different completely standard low mileage j spec TT's dyno'd at 321bhp and 323bhp respectively. Check out all the threads on BPU on the forum for full details of what parts but really you're looking at 400bhp max at the fly with standard turbos. Beyond that you are as well to go single turbo. Don't bother with larger injectors - the problem these cars have is too much fuel as standard with AFR's in the 10:1 range and under when on the 2nd turbo. A piggyback or replacement standalone ECU is a good idea to optimise your setup at BPU but by no means essential. In my opinion the things you should buy for BPU (assuming std IC in good condition and car well serviced / running fine) are: 1. Aftermarket exhaust - Blitz Nur Spec R my preference but dozens will do the job well with differing levels of noise. 2. 2.5" Decat pipes 3. Restrictor ring to limit boost to 1.2bar 4. NGK BKR7E or BCPR7ES spark plugs gapped down to 0.9mm or just under 5. Walbro 255LPH fuel pump or new UK spec pump from Toyota That's it! Quote Link to comment Share on other sites More sharing options...
supraGZaerotop Posted August 21, 2008 Share Posted August 21, 2008 No, J specs officially came with 280bhp, as per the OEM manufacturers agreement in place at the time. Anything more than that is pure speculation. the jspecs are 320+ all the way if you ask me:cool: Quote Link to comment Share on other sites More sharing options...
Guest verbal Posted August 21, 2008 Share Posted August 21, 2008 Back in the day all the japanese manufacturers came up with a gentlemans agreement because things were just turning into stupid HP wars, the agreement was to limit the vehicles to 280HP, nobody really followed that agreement, each manufacturer published 280HP but people have dyno'd the supras and skylines of the day and they were producing well over 300HP. Quote Link to comment Share on other sites More sharing options...
R Black Posted August 21, 2008 Share Posted August 21, 2008 The difference between the jspec & ukspec from what i have seen is the actual power delivery is somewhat different although their bhp is similar. As for going over say 390 bhp (although all cars differ) i would think piggyback ecu, could make 420 bhp achievable. Quote Link to comment Share on other sites More sharing options...
MarkR Posted August 21, 2008 Share Posted August 21, 2008 Who cares. So long as the car does what you want and you have fun... 280/320 blah blah blah... we could be here all day. FFS Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted August 22, 2008 Share Posted August 22, 2008 Unless you want to be disappointed, the J spec is 280bhp. As I said, anything more is speculation because there has never been a published account from the manufacturer. If your Supra has 320bhp then you're lucky... same as some of the BMW M series cars fluctuating by around 50bhp from the factory. I'm sure some J spec Supras did come with 280bhp, if only the early models. Quote Link to comment Share on other sites More sharing options...
SilverSoop Posted August 22, 2008 Share Posted August 22, 2008 Unless you want to be disappointed, the J spec is 280bhp. As I said, anything more is speculation because there has never been a published account from the manufacturer. If your Supra has 320bhp then you're lucky... same as some of the BMW M series cars fluctuating by around 50bhp from the factory. I'm sure some J spec Supras did come with 280bhp, if only the early models. Well with a bit of luck then, my Supe came with 320 bhp from the factory... :-D Quote Link to comment Share on other sites More sharing options...
tDR Posted August 22, 2008 Share Posted August 22, 2008 Unless you want to be disappointed, the J spec is 280bhp. As I said, anything more is speculation because there has never been a published account from the manufacturer. If your Supra has 320bhp then you're lucky... same as some of the BMW M series cars fluctuating by around 50bhp from the factory. I'm sure some J spec Supras did come with 280bhp, if only the early models. Rubbish. Quote Link to comment Share on other sites More sharing options...
Thorin Posted August 22, 2008 Share Posted August 22, 2008 Rubbish. I have to agree. There have been several standard J-Spec's dyno'd right around 320BHP, they were never 280. Quote Link to comment Share on other sites More sharing options...
Firestorm Posted August 22, 2008 Share Posted August 22, 2008 as far as im concerned im stock 320..it may not be true but it makes me feel better to beleive that is is lol Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted August 22, 2008 Share Posted August 22, 2008 rubbish. i have to agree. There have been several standard j-spec's dyno'd right around 320bhp, they were never 280. as far as im concerned im stock 320..it may not be true but it makes me feel better to beleive that is is lol ok Quote Link to comment Share on other sites More sharing options...
MarkR Posted August 22, 2008 Share Posted August 22, 2008 Does that mean that the VVTI's are higher than 320? They apparently have a mythical 25bhp more than a standard Jap car, so does that equate to me having 345bhp before mods....? doubtful I think. Quote Link to comment Share on other sites More sharing options...
Thorin Posted August 22, 2008 Share Posted August 22, 2008 Does that mean that the VVTI's are higher than 320? They apparently have a mythical 25bhp more than a standard Jap car, so does that equate to me having 345bhp before mods....? doubtful I think. 25bhp higher in the mid-range maybe, but I don't think Toyota ever officially said they were 25bhp higher than the non-VVTI. Quote Link to comment Share on other sites More sharing options...
Guest beefycol Posted August 22, 2008 Share Posted August 22, 2008 (edited) lol this post gone off the subject, i read on serveral websites that its 280, and serveral that its a myth and its 320. people have had like said 320 from the factory. what ever is true i just hope mines 320. anyway the mods im going to be doing are fuel pump, colder spark plugs decat, resistrictor ring boost controller dump valve piggy back ecu service fuel cut defender induction kit then when i got some spare money front mount intercooler and short shifter i was reading the BPU and it says resistrictor ring because the small size waste gate, on the uk model you dont need a resistrictor ring because it had got a bigger waste gate. well if ive got a after market waste gate on will i still need a resistrictor ring? plus im goin to put a boost controller on would i still need one because you can control the psi boost with the boost controller? Edited August 22, 2008 by beefycol (see edit history) Quote Link to comment Share on other sites More sharing options...
supraGZaerotop Posted August 22, 2008 Share Posted August 22, 2008 Rubbish. i agree Quote Link to comment Share on other sites More sharing options...
tDR Posted August 22, 2008 Share Posted August 22, 2008 You can't use an aftermarket wastegate with the standard internally gated setup unless you go to a lot of expense and time taking the turbos and manifold off to extensively modify them. I wouldn't bother with a boost controller - the point in the restrictor ring is to limit boost to a sensible level. Size it correctly and there's no need for a boost controller as you'll be at the highest boost level you want to run and they cannot lower boost. Quote Link to comment Share on other sites More sharing options...
Guest beefycol Posted August 22, 2008 Share Posted August 22, 2008 You can't use an aftermarket wastegate with the standard internally gated setup unless you go to a lot of expense and time taking the turbos and manifold off to extensively modify them. I wouldn't bother with a boost controller - the point in the restrictor ring is to limit boost to a sensible level. Size it correctly and there's no need for a boost controller as you'll be at the highest boost level you want to run and they cannot lower boost. ok cheers that save me some money then. take the boost controller off my list. please check my new post need more help https://www.mkivsupra.net/vbb/showthread.php?t=160028 Quote Link to comment Share on other sites More sharing options...
Anees Posted October 10, 2008 Share Posted October 10, 2008 I have to agree. There have been several standard J-Spec's dyno'd right around 320BHP, they were never 280. The previous owner of my car had mine dynoed at 326bhp with the only mod a front downpipe; so I do think most j Specs are around the 320bhp mark. Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 10, 2008 Share Posted October 10, 2008 Be warned though, you will always have your hand in your pocket once you go single... I have to disagree, if you ask me it comes down to what parts you use, quality of install, who tunes it and how its maintaned. Like any car though something will go wrong but if the jobs done proper it shouldn't be major expence.. Cost you a fortune in fuel though! Posted via Mobile Device Quote Link to comment Share on other sites More sharing options...
MarkR Posted October 10, 2008 Share Posted October 10, 2008 I wouldn't bother with a boost controller - the point in the restrictor ring is to limit boost to a sensible level. Size it correctly and there's no need for a boost controller as you'll be at the highest boost level you want to run and they cannot lower boost. I agree. The aftermarket BC was the biggest waste of time and money I've ever done, although at the time I thought I was doing the right thing. If you're going BPU you really don't need it. It can control the boost upwards, but lets be honest, once you've decatted it, done the induction and got rid of the fuel cut, all you really need to do is keep the boost from running away, and a BC is no good for limiting Boost, only increasing it. Get a nice 1.2 bar RR and enjoy Save the BC for later. You'll know when. Quote Link to comment Share on other sites More sharing options...
SilverSoop Posted October 10, 2008 Share Posted October 10, 2008 I have to disagree, if you ask me it comes down to what parts you use, quality of install, who tunes it and how its maintaned. Like any car though something will go wrong but if the jobs done proper it shouldn't be major expence.. Cost you a fortune in fuel though! Posted via Mobile Device That is true however ask a member who has gone single, Pig, Gaz 1, tooquicktostop, Jamie P or even Chris Wilson, they'll tell you exactly how much it costs to build, run and maintain... Quote Link to comment Share on other sites More sharing options...
Guest redsupra31 Posted October 11, 2008 Share Posted October 11, 2008 hi all, Just some info. input & also professional advice. TQ. My UK Spec Supra TT VVTI Auto-Tiptronic boosting 1.1bar is getting 330 bhp/43.8 kg/torque on wheel. Modification - ARC intercooler, ARC BOV, HKS spark plug (7), HKS air filter, HKS oil cooler, HKS auto gearbox oil cooler, ARC power steering oil cooler, HKS FCD, APEXi Boost Controller. Others all factory standard. Plan to Upgrade - Greedy E-Manage Ultimate & HKS Valcon V-Cam (inlet & exhaust). How many bhp can i get??? Quote Link to comment Share on other sites More sharing options...
miko_supra Posted October 11, 2008 Share Posted October 11, 2008 I have a manual boost controller fitted on mine. Cost me about £5 and allows me to raise and lower the boost from 1 bar to 1.2 bar. Quote Link to comment Share on other sites More sharing options...
Thorin Posted October 11, 2008 Share Posted October 11, 2008 My UK Spec Supra TT VVTI Auto-Tiptronic You do not have a UK spec Supra. Quote Link to comment Share on other sites More sharing options...
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