ADD Posted December 4, 2005 Share Posted December 4, 2005 gone bpu this week (cheers wiffbitz) but im only kicking out max 1 bar. when i boot it, i can hear an air leak somewhere but all the pipes are on properly!!!! any ideas what it could be??? Quote Link to comment Share on other sites More sharing options...
BURT Posted December 4, 2005 Share Posted December 4, 2005 congrats on going bpu fella, i went bpu myself a while ago, the difference is amazing:ecstatic: as for the air leak it could be several things, do you have a boost guage fitted, if so are you loosing boost pressure? not too good on the tech side but help will be along soon., Quote Link to comment Share on other sites More sharing options...
ADD Posted December 4, 2005 Author Share Posted December 4, 2005 oh i certainly notice the difference, but its not as quick as it should be...the boost gauge is reading 1 bar when i blat it with the 2nd turbo! the noise is unbelievable with the decat and nur spec :) Quote Link to comment Share on other sites More sharing options...
jaymdee Posted December 4, 2005 Share Posted December 4, 2005 Hi mate, You probably need the hole in the restrictor ring enlarging by a few mm. J:) Quote Link to comment Share on other sites More sharing options...
ADD Posted December 4, 2005 Author Share Posted December 4, 2005 its a cw ring and im under the impression that he makes them to a set size for j-specs Quote Link to comment Share on other sites More sharing options...
terribleturner Posted December 4, 2005 Share Posted December 4, 2005 When Chris makes the Restrictor ring, they are made as close to 1.2 bar as he can, not on the nose. I could be wrong but a BPU supra should be running at 1bar if not a little over (15/16psi), not 1.2 (18/19) start off. Quote Link to comment Share on other sites More sharing options...
hadyn Posted December 4, 2005 Share Posted December 4, 2005 Dont worry about it every supra boosts to slightly different levels, at least you're not going over 1.2 bar Mine peaked at 1bar when I went BPU in April this year, and now peaks at 1.2 bar every now and again with the cold weather. I can pull low 13s 1/4 miles all day with 1 bar boost, so you definately wont be slow mate Quote Link to comment Share on other sites More sharing options...
Pete Posted December 4, 2005 Share Posted December 4, 2005 I guess it depends on how reliable your gauge is too. Quote Link to comment Share on other sites More sharing options...
ADD Posted December 5, 2005 Author Share Posted December 5, 2005 thanks lads, still miffed about where the air leak is coming from though! Quote Link to comment Share on other sites More sharing options...
Stonkin Posted December 5, 2005 Share Posted December 5, 2005 Add, i've also just gone BPU and am only making just under 1 bar (see rolling road thread in meets section, just posted up my graphs) this is with a CW 1.2 restrictor ring. I was advised on the day to possibly make the hole a little larger. My question is how much larger to make it? But as your hearing an air leak, your issue may be a little different. Quote Link to comment Share on other sites More sharing options...
hogmaw Posted December 5, 2005 Share Posted December 5, 2005 Or you could just get a boost controller Quote Link to comment Share on other sites More sharing options...
Suprasteve Posted December 5, 2005 Share Posted December 5, 2005 after my double decat with no ring i'm struggling to get 1 bar - been told this is very odd but with the help of a boost controller i upped it to 1.2 without any probs. i'm still trying to find a leak though:shrug: Quote Link to comment Share on other sites More sharing options...
Stonkin Posted December 5, 2005 Share Posted December 5, 2005 I dont mean to hijack this thread, but, if i fitted a boost controller would i be able to up the boost even through the ring is in there. Would the ring prevent it from going up. Just curious Quote Link to comment Share on other sites More sharing options...
ADD Posted December 5, 2005 Author Share Posted December 5, 2005 Or you could just get a boost controller thats what i'm going at present, which one should i get? Quote Link to comment Share on other sites More sharing options...
ADD Posted December 5, 2005 Author Share Posted December 5, 2005 Add, i've also just gone BPU and am only making just under 1 bar (see rolling road thread in meets section, just posted up my graphs) this is with a CW 1.2 restrictor ring. I was advised on the day to possibly make the hole a little larger. My question is how much larger to make it? But as your hearing an air leak, your issue may be a little different. its starting to annoy me now cause i'm clearly losing power through it! Quote Link to comment Share on other sites More sharing options...
chilli Posted December 5, 2005 Share Posted December 5, 2005 The standard wiffbitz double 2.5" SS de-cat and supplied restrictor (excellent VFM BTW) on my car raised the boost from around .9 to ~1.2ish without any fiddling. I already had the cat-back. But, I didn't see this increased boost until I reset the ECU properly, before that it was around 1 bar and holding back a lot, different car once the ECU was reset and it re-learnt. Induction kit makes a roar that might be mistaken for a leak, you running the standard air box? have you reset the ECU? Got the right plugs? congrats btw for going BPU, transforms the car, I'm loving it also just need more traction on these cold days! Quote Link to comment Share on other sites More sharing options...
ADD Posted December 5, 2005 Author Share Posted December 5, 2005 The standard wiffbitz double 2.5" SS de-cat and supplied restrictor (excellent VFM BTW) on my car raised the boost from around .9 to ~1.2ish without any fiddling. I already had the cat-back. But, I didn't see this increased boost until I reset the ECU properly, before that it was around 1 bar and holding back a lot, different car once the ECU was reset and it re-learnt. Induction kit makes a roar that might be mistaken for a leak, you running the standard air box? have you reset the ECU? Got the right plugs? dont think the ecu was reset, it was all fitted up at wiffbitz! i have standard air box (apparently the better) denso ik24's plugs and walbro pump/filter! how do you reset Quote Link to comment Share on other sites More sharing options...
chilli Posted December 5, 2005 Share Posted December 5, 2005 I just pulled the 3 ecu fuses (green 15A IIRC) in the fuse box in the engine bay, for about two minutes. Then replaced and went for a drive. Took a few full power blips to get full power, each one saw the car going better until it was on full song Quote Link to comment Share on other sites More sharing options...
terribleturner Posted December 6, 2005 Share Posted December 6, 2005 I'm sure with my boost controller off i'm at 14psi (1 bar), but with it on i have it set at either 16 psi pr 18/19psi (1.2/3 bar). Quote Link to comment Share on other sites More sharing options...
Stonkin Posted December 6, 2005 Share Posted December 6, 2005 When i had my decat fitted, i removed EFI Fuse 1 (was a green 30amp fuse) Upon starting the car i expected it to struggle to start and splutter a bit for a second while it learnt the new settings. But it didnt, it just started fine as usual. So i was thinking that perhaps it didnt reset anything. Which is perhaps why i'm not making as much boost as i was thinking i would after doing this. Or, i simply do need to take a couple of mm's out of the restrictor ring. Christian Quote Link to comment Share on other sites More sharing options...
ADD Posted December 7, 2005 Author Share Posted December 7, 2005 i'm gonna have a go at reseting the ecu first o think, fingers crossed Quote Link to comment Share on other sites More sharing options...
JohnA Posted December 7, 2005 Share Posted December 7, 2005 ..Upon starting the car i expected it to struggle to start and splutter a bit for a second while it learnt the new settings... The Supra ECU is of excellent quality, it won't struggle or hunt at all, especially if you have stock injectors fitted. It just runs a bit richer for a while, and it might ping once or twice under full throttle if you're BPU. It soons finds the optimal settings and runs like clockwork. I've been through this with Motronic, and while it was flexible and nice, the supra ECU is just in a different league. Remember to reset both FI fuses. 30 seconds are enough. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted December 7, 2005 Share Posted December 7, 2005 Ok cheers John, i only pulled out EFI 1 so will do both later today. Thanks Christian Quote Link to comment Share on other sites More sharing options...
supRo Posted December 7, 2005 Share Posted December 7, 2005 after my double decat with no ring i'm struggling to get 1 bar - been told this is very odd but with the help of a boost controller i upped it to 1.2 without any probs. i'm still trying to find a leak though:shrug: Very strange indeed! What size are your decats? aftermarket back box? Not sure if a leaky Boost pressure tank causes problems with only turbo 2 coming online or loosing boost too. Have you tried it in True Twin mode - this will eliminate problems with the VSV's I recommend Thor for this sort of diagnostic work. I dont mean to hijack this thread, but, if i fitted a boost controller would i be able to up the boost even through the ring is in there. Would the ring prevent it from going up. Just curious Yes Christian, Boost controller can up the boost from whatever the car is currently making. You can't go below what it's currently making though. Mines makes 1 bar without the boost controller. Cheers, Ro Quote Link to comment Share on other sites More sharing options...
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