adi2009 Posted January 24, 2005 Share Posted January 24, 2005 Ok, i m a little confused about this. I read that a restrictor plate is needed when a de-cat is performed on a jap spec TT to keep boost from exceeding 1.2 bar. But isnt it the wastegates job to dump excessive boost? so when de-catting the jap car would i need a boost controller to bump up boost? THanks adi Link to comment Share on other sites More sharing options...
mawby Posted January 24, 2005 Share Posted January 24, 2005 The jap turbos have very small wastegates as they use the cats to keep the boost below 1 bar. If you remove the cats the wastegates cannot cope and you can hit between 1.2 and 1.5 bar. That's where the restrictor ring comes in to bring it back down again. Link to comment Share on other sites More sharing options...
adi2009 Posted January 24, 2005 Author Share Posted January 24, 2005 Thanks mate, so suppose i run 3 inch down pipes, approximately what would be the necessary diameter of the hole in the restrictor plate. Cheers!!! Link to comment Share on other sites More sharing options...
mawby Posted January 24, 2005 Share Posted January 24, 2005 That I couldn't tell you, someone like Chris Wilson would be the best person to ask. Also worth remembering that the boost level will change with the weather, so setting it to 1.2 now will result in slightly less in the summer - but it's safer that way round then having 1.2 in summer and blowing your engine in winter! Link to comment Share on other sites More sharing options...
mawby Posted January 24, 2005 Share Posted January 24, 2005 It's also worth noting that you'll need a FCD and colder plugs if you want to raise the boost. And I think there's something else, but I can't remember now. I've got an aftermarket ECU so I didn't have to bother with any of that when I took one of my cats out, I got 1.2/1.3 straight away. Link to comment Share on other sites More sharing options...
Jake Posted January 24, 2005 Share Posted January 24, 2005 It's also worth noting that you'll need a FCD and colder plugs if you want to raise the boost. And I think there's something else, but I can't remember now Fuel pump? Link to comment Share on other sites More sharing options...
mawby Posted January 24, 2005 Share Posted January 24, 2005 Fuel pump?Yeah it is recommended, not that I've changed mine though and the dyno showed plenty of fuel getting through. Depends on the car really and the condition of the pump. Oh yeah, obvious addition is a boost guage to make sure it doesn't raise too high. Link to comment Share on other sites More sharing options...
Getrag Posted January 24, 2005 Share Posted January 24, 2005 Boost guage with peak hold to monitor it. Link to comment Share on other sites More sharing options...
adi2009 Posted January 25, 2005 Author Share Posted January 25, 2005 thanks a lot for all the response. basically just wanted to give you'll some idea of what i m doing. I am doing a NA to TT engine swap but running the W-58 5spd transmission from the NA as the TT engine is and auto tranny. (but i ve got a set of manual ecu and wiring loom separately) the following mods i will be performing are: 255lph walbro pump manual boost controller de-catted exhaust (well got to think carefully about that now) Greddy BCC HKS SSQ blow off valve NGK iridium spark plugs (not sure yet as i dont know if the one i already got would fit the TT) A/F gauge Boost gauge (manual not electronic gauge) thanks adi Link to comment Share on other sites More sharing options...
mawby Posted January 25, 2005 Share Posted January 25, 2005 Why didn't you say so then! Look at http://www.mkivsupra.net/vbb/showthread.php?t=13155 for some useful discussions the last time it was suggested. Link to comment Share on other sites More sharing options...
Jake Posted January 25, 2005 Share Posted January 25, 2005 I am doing a NA to TT engine swap but running the W-58 5spd transmission from the NA Wow. That's going to be a lot of work! Will the NA transmission be able to handle the TT torque? What about the gearing, are you planning on using the NA diff? Is the car an Aerotop or hardtop? Anyway, good luck with it. Please keep us posted as it progresses Link to comment Share on other sites More sharing options...
adi2009 Posted January 25, 2005 Author Share Posted January 25, 2005 Ya mate, its gonna be some bit of work. well i really dont know if that 5spd is going to handle that torque (although i have read in places that it is reliable up to 500bhp crank and the jap spec TT only would put about 400 max with stock twins) and running the NA diffs also, well atlest until i find a 6spd tranny and diffs. my car is a hardtop. will get some pics of it up when i do the swap. cheers!!! Link to comment Share on other sites More sharing options...
Guest jtanoyo1 Posted January 26, 2005 Share Posted January 26, 2005 Why not get an AVC-R and be done with it? Link to comment Share on other sites More sharing options...
Toms Supra Posted January 26, 2005 Share Posted January 26, 2005 what exactly does a fcd do? stops the car running lean? can someone explain AS im still new to all this. Link to comment Share on other sites More sharing options...
hadyn Posted January 26, 2005 Share Posted January 26, 2005 Fuel Cut Defencer stops the car from hitting fuel cut when the boost is raised. Fuel cut is a preventitive measure which cuts off fuel to the injectors if the ECU senses the boost is too high and could possibly run lean. From my limited experience of TT Supes, i think the factory set fuel cut is around 1 bar Link to comment Share on other sites More sharing options...
Toms Supra Posted January 26, 2005 Share Posted January 26, 2005 ok my supra makes 1.3bar according to my boost controller! Link to comment Share on other sites More sharing options...
hadyn Posted January 26, 2005 Share Posted January 26, 2005 1.3 bar is a little too much i'd consider an uprated walbro fuel pump and possibly a fuel pressure regulator to make sure you dont run lean at the top end, im not sure whether an old standard fuel pump can deliver enough fuel for that much boost Link to comment Share on other sites More sharing options...
Toms Supra Posted January 26, 2005 Share Posted January 26, 2005 yeah im in the process of getting a walbro at the moment and poss an fse. ok cool thanks mate. Link to comment Share on other sites More sharing options...
hadyn Posted January 26, 2005 Share Posted January 26, 2005 turn the boost down to 1.2 bar too to be safe Link to comment Share on other sites More sharing options...
TLicense Posted January 26, 2005 Share Posted January 26, 2005 whoa whoa whoa, Your just looking at getting a warlbro and an FSE???? Looking at your sig, aren't you running hybrids and a 100 shot of nos? You're going to need a bigger boat... The J-spec fuelling is going to struggle with standard tubbies at 1.2 bar. You're putting a significantly larger amount of air through that the stock fuel system is trying to cope with. Try to remember that no matter how much air goes into the engine, it still needs to stick to about 14.7:1 ratio air-fuel. There's no way the jap injectors will be supplying that with your hybrids and then a 100 shot of nos. I would suggest a complete overhaul of your fuelling system, ie larger injectors, a fuelling computer to control those injectors and the pump and regulator that you mentioned. (Although if I was you I would go for the aeromotive over the FSE and just get the right sized injectors/pump and have it mapped more linearly - Just my humble opinion!) Best of luck, Link to comment Share on other sites More sharing options...
hadyn Posted January 26, 2005 Share Posted January 26, 2005 i cant believe someone has uprated the turbos etc and not done much to sort out the fuelling really... Link to comment Share on other sites More sharing options...
The Hornet Posted January 27, 2005 Share Posted January 27, 2005 That's why my next mods' are my fueling etc before I go Hybrid, I don't want a melted engine Link to comment Share on other sites More sharing options...
Toms Supra Posted January 27, 2005 Share Posted January 27, 2005 Well I have only just bought the car 3 weeks ago! easy! Link to comment Share on other sites More sharing options...
Toms Supra Posted January 27, 2005 Share Posted January 27, 2005 I am presuming the pump etc is standard as the bloke before bought it standard. so where can I get injectors and that from then and which ones and where do I get an aeromotive. The mods were already done to this car so dont blame me if its wrong! Link to comment Share on other sites More sharing options...
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