wkdtime Posted January 24, 2005 Share Posted January 24, 2005 I think i went about the question in the wrong way, let me be more specific (thankx for baring me wid me guys), firstly what is the standard boost on a supra j spect? and now the main point, i want to push max 1.0bar, how can i go by this? would i need fuel management? larger fuel pump? larger injectors? my budget is quite stretched though! help guys! i know these cars have alot more potential than i can give em! Quote Link to comment Share on other sites More sharing options...
merckx Posted January 24, 2005 Share Posted January 24, 2005 I think i went about the question in the wrong way, let me be more specific (thankx for baring me wid me guys), firstly what is the standard boost on a supra j spect? and now the main point, i want to push max 1.0bar, how can i go by this? would i need fuel management? larger fuel pump? larger injectors? my budget is quite stretched though! help guys! i know these cars have alot more potential than i can give em! Standard boost I think is about 0.7 bar A decent exhaust should take it to 0.9 bar. Removing the second cat should take it to around 1.0 bar. You don't need fuel management, larger fuel pump or larger injectors. Quote Link to comment Share on other sites More sharing options...
Jake Posted January 24, 2005 Share Posted January 24, 2005 thankx for baring me wid me guys Mate, please don't take this the wrong way but I think you'll find that a lot of the more technical guys won't reply to posts that aren't in English. what is the standard boost on a supra j spect? 0.8 bar i want to push max 1.0bar, how can i go by this? would i need fuel management? larger fuel pump? larger injectors? Not for 1.0bar. A better fuel pump would be a good idea though. For less than £100 it's good insurance. Quote Link to comment Share on other sites More sharing options...
Jake Posted January 24, 2005 Share Posted January 24, 2005 You don't need fuel management, larger fuel pump or larger injectors.My '93 RZ urgently needed an uprated fuel pump once I decatted. At 1.1bar is was dangerously lean. IMO, for the price of a Walbro it's not worth not uprating the fuel pump. Quote Link to comment Share on other sites More sharing options...
merckx Posted January 24, 2005 Share Posted January 24, 2005 for the price of a Walbro it's not worth not uprating the fuel pump. I agree, I just meant it wasn't something that you had to get. Mate, please don't take this the wrong way but I think you'll find that a lot of the more technical guys won't reply to posts that aren't in English. Why? We could understand. Quote Link to comment Share on other sites More sharing options...
Jake Posted January 24, 2005 Share Posted January 24, 2005 We could understandMaybe so but I've noticed that a lot of the respected tech chaps like CW, Ian C, etc don't often reply to posts that r al dun in txtspk???!!!1 (Except the ones by MonkeyMark and Usman Ali but those guys aren't usually asking for help. They already know Supras inside and out) Anyway, what's wrong with trying to maintain a certain standard? [/hijack] Quote Link to comment Share on other sites More sharing options...
merckx Posted January 25, 2005 Share Posted January 25, 2005 Anyway, what's wrong with trying to maintain a certain standard? [/hijack] I know, some of the spelling is diabolical. Maybe they don't realise. Makes me laugh! Quote Link to comment Share on other sites More sharing options...
tbourner Posted January 25, 2005 Share Posted January 25, 2005 Anyway enough of that. Just get a boost gauge, Walbro, second decat and cat back exhaust. That'll see you through until you've got more money. Bear in mind though you will want more soon after even if you DON'T have any money!! Quote Link to comment Share on other sites More sharing options...
Nic Posted January 25, 2005 Share Posted January 25, 2005 Welcome to the club, here is what i suggest you do, in this order. 1. Check the condition of your intercooler, if it is old and has broken/crumbling fins then I would keep the boost stock until it can be replaced. 2. Fit a boost gauge, a mechanical one will be the cheapest if you are on a budget. A boost gauge is vital if you are going to start making engine mods so you can monitor boost levels. 3. Fit an aftermarket performance exhaust and remove the first (nearest the engine) or both cats. This will make the exhaust more freer flowing, allowing the turbos to boost higher. On most j-specs you will need to fit a restristor ring in the exhaust to prevent the turbos from boosting too high. Chris Wilson on the board can advise/supply/fit the decat pipes and restrictor ring you need. 4. The Supra ecu has a built in fuel cut when the turbos boost over around 0.9bar, so when you fit the exhaust/decat pipes you will also need to fit a Fuel Cut Defender this will stop the fuel being cut and allow higher boost. Pete Betts at Thor (see traders section) can supply/fit the FCD. 5. Fit new cooler grade spark plugs, to prevent misfire at higher boost (do a search for plug info.) 6. The stock j-spec fuel system should be able to cope upto around 1bar, but it would be worth checking the air/fuel mixture on a dyno to be 100% sure. 7.If you want to up the boost further (max 1.1 -1.2bar) then you will eiether need to fit a less restrictive ring in the exhaust or fit a bleed valve/boost controller. To run safely at 1.2bar you will need to fit a higher pressure fuel pump, fuel pressure regulator and electronics to control the fueling, this will all need setting up on a dyno to get the air/fuel mixture correct. The stock injectors should be able to cope but will be very near their duty limit, this can be checked on the dyno run. 8. At these boost pressures then it would also be wise to fit an uprated intercooler and Exhaust gas Temperature gauge. The best advise I can give you is to find a good tuner who knows about Supras there are a number on here (Chris Wilson, Vortex, Thor, etc.) that will be able to advise you, supply, fit and make sure everything is set up correctly. Good Luck Quote Link to comment Share on other sites More sharing options...
tbourner Posted January 25, 2005 Share Posted January 25, 2005 Very good write up Nic, worthy of the FAQ section!! Reminds me I need a FMIC and EGT gauge!! Quote Link to comment Share on other sites More sharing options...
Nic Posted January 25, 2005 Share Posted January 25, 2005 Thanks Trev, I remember what it was like 6 years ago when I bought mine and was new to it all. I learnt everything through experience, from other experienced members and from chatting with/watching the guys who work on my car. I had some real problems with various so called 'tuners' when I first started out so have learnt some things the hard way. The key thing I did learn is to find a tuner who is an expert, who has experience of the Supra, who has the right set up/tool to do the job and someone you can trust. One other piece of advise for new members (whilst I'm on my soap box ), if you need an answer to something, ask the right question, with all relevant information and writen as clearly as possible (what Jake said ) Quote Link to comment Share on other sites More sharing options...
wkdtime Posted January 25, 2005 Author Share Posted January 25, 2005 firstly no more short txt style writing!...sorry for those offended. how about i go for twin decats, with restrictor ring set for 1.0-1.1 bar, walbro pump, boost controller set at 1.0 bar max, plugs, exhaust, gauge! would i need an induction kit? is this a safe set up? i.e will i be running lean at higher revs! finally any quotes on what bhp figures id be likely to achieve with these mods assuming engine is healthy? kind regards amz Quote Link to comment Share on other sites More sharing options...
SimonB Posted January 25, 2005 Share Posted January 25, 2005 You don't need a boost controller - making the exhaust free flowing on a Jspec by decatting will increase boost as the standard wastegate can't flow the excess away fast enough. If you only want 1BAR you should get this easily by removing the first cat only and fitting an exhaust - then you wouldn't need a restrictor ring. You only need the ring if you remove both cats and find boost has gone too high (which it almost certainly would do). Don't get an induction kit unless you like the noise - they usually reduce power rather than increase it because they suck in hot air from the engine compartment rather than nice cold air like the standard airbox. The standard filter is not a restriction until you get to silly power. I started off with an exhaust and first cat removal, new plugs and a boost gauge (well actually a turbo timer with a gauge built in) - that gave me just over 1BAR IIRC and probably around 340bhp I would have thought. Quote Link to comment Share on other sites More sharing options...
tbourner Posted January 25, 2005 Share Posted January 25, 2005 If you're getting the Walbro and plugs, you might as well get the twin decat and a bigger restrictor ring (mine from Dude sees about 1.2 bar), as long as you get the VFCC you'll be set for the 400+ club!! Quote Link to comment Share on other sites More sharing options...
wkdtime Posted January 25, 2005 Author Share Posted January 25, 2005 Just saw your car and details, nice car and sweet spec, did you manage to get that bhp from the stock internals and stock turbo? injectors? Quote Link to comment Share on other sites More sharing options...
wkdtime Posted January 25, 2005 Author Share Posted January 25, 2005 Sorry that last reply was for Simon B! Quote Link to comment Share on other sites More sharing options...
wkdtime Posted January 25, 2005 Author Share Posted January 25, 2005 tbourner, You may be right, but i think i'll start of slow, and when the money starts flowing in quicker i may just do that mate! cheers for the advice! Quote Link to comment Share on other sites More sharing options...
SimonB Posted January 25, 2005 Share Posted January 25, 2005 Just saw your car and details, nice car and sweet spec, did you manage to get that bhp from the stock internals and stock turbo? injectors? I've done loads to it last year. I started off with just a 1st decat and exhaust, had that setup for quite a while. Then I figured it was the time I'd normally have sold up and bought another car, but there was nothing else I wanted so I'd spend what I would have done on another car on upgrades! Trouble is once you get to a certain point you need loads of things to go any further (to do it properly anyway). I wasn't happy using the standard intercooler at 1.2BAR or more, so I bought the FMIC, 2nd decat and fuel pump. My clutch started slipping, so I had to upgrade that and did the flywheel at the same time. I had it on the dyno at Billing last year which confirmed that the fuelling wasn't enough for more than 1.2BAR. So I brought forward plans to sort it out. I've got an Emanage which currently is adding extra fuel in the mid-range of revs, but I'm at 100% duty cycle on the injectors at high revs. So I now have an Aeromotive adjustable fuel pressure reg to be fitted, which I will use to increase the fuel pressure, then use the Emanage to trim the fueling back everywhere apart from where I need the extra. I've got a wideband to measure the air/fuel ratio so I can set this up correctly. Still got the standard Jspec 440cc injectors, internals and turbos. EDIT: That power run was basically running rather lean, which is good for power but not for your cars health! I was keeping it off full boost at the time wiht my right foot! It's probably putting out a bit less now, but it should be back up there when I've sorted my fuelling out properly. Quote Link to comment Share on other sites More sharing options...
Thorin Posted January 26, 2005 Share Posted January 26, 2005 I think i went about the question in the wrong way, let me be more specific (thankx for baring me wid me guys), firstly what is the standard boost on a supra j spect? and now the main point, i want to push max 1.0bar, how can i go by this? would i need fuel management? larger fuel pump? larger injectors? my budget is quite stretched though! help guys! i know these cars have alot more potential than i can give em! You just need some blue neon washer jets, matching undercar neons, 6 exhausts, and a burberry cap. Job done. Quote Link to comment Share on other sites More sharing options...
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