chris.neale Posted September 30, 2012 Share Posted September 30, 2012 (edited) Hi everyone, I'm new to this forum and wonder if you can help me. I have recently bought a twin turbo supra after many years of wanting one. it doesn't seem to be holding boost correctly. I have been checking all of the vacuum hose and noticed that the pressure tank seems to be bypassed. Would this cause the car not to boost correctly is there any benefit to by passing it ? I have uploaded a standard picture and drawn badly a vacuum hose on it as i can't get a camera down there. The other two pictures, the picture of the blue vacuum hose is going to the pressure tank the black vacuum hose with the screw in is coming off it. I don't think this right but any advice would be grateful![ATTACH=CONFIG]158405 Edited September 30, 2012 by chris.neale (see edit history) Quote Link to comment Share on other sites More sharing options...
bignum Posted September 30, 2012 Share Posted September 30, 2012 Iirc the sequential system won`t work without the tank. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted September 30, 2012 Share Posted September 30, 2012 Yep that would certainly do it. Quote Link to comment Share on other sites More sharing options...
David P Posted September 30, 2012 Share Posted September 30, 2012 That looks like an N/A dipstick in your T.T. transmission too, if so, you could have a litre or three to much fluid in there. Check it with a T.T. dipstick to find out, running with that much extra fluid could blow the seals on the transmission. Quote Link to comment Share on other sites More sharing options...
David P Posted September 30, 2012 Share Posted September 30, 2012 Also, the charcoal filter has been removed, this is not a problem as long as the fuel tank vent pipe has been blocked as well as the vacuum, if not the car will waft of petrol fumes. I would recommend you have someone who knows Supra's take a look at it, if there are three bodges that can be spotted in those limited view pics, odds on there will be more. Quote Link to comment Share on other sites More sharing options...
chris.neale Posted September 30, 2012 Author Share Posted September 30, 2012 Hi guys, Thanks for the info. It was a n/a supra originally. It has had a twin turbo engine and gearbox added at some point. Is there any reason for them to by pass the pressure tank? Quote Link to comment Share on other sites More sharing options...
David P Posted September 30, 2012 Share Posted September 30, 2012 Probably a misguided effort to run the turbo's in parallel instead of sequential. Get it looked at. Quote Link to comment Share on other sites More sharing options...
chris.neale Posted September 30, 2012 Author Share Posted September 30, 2012 I will thanks. I live in Norfolk so there's not many garages that know supra's inside and out. Can anyone suggest a good supra garage? I have been to a "performance garage" where the dyno the car and it produced 304 bhp and 292 lbft. they said it seemed to be OK. To be honest with all the basic BPU been already done i thought it would produce more? Quote Link to comment Share on other sites More sharing options...
David P Posted September 30, 2012 Share Posted September 30, 2012 Yes it should. It would be a good idea, by appointment, to take a trundle to Leicester and have Keron take a look at it. http://www.mkivsupra.net/vbb/member.php?676-keron Quote Link to comment Share on other sites More sharing options...
Slicknick Posted September 30, 2012 Share Posted September 30, 2012 I will thanks. I live in Norfolk so there's not many garages that know supra's inside and out. Can anyone suggest a good supra garage? I have been to a "performance garage" where the dyno the car and it produced 304 bhp and 292 lbft. they said it seemed to be OK. To be honest with all the basic BPU been already done i thought it would produce more? That's a very poor power figure for a TT let alone a BPU one! You should be in the 370-420 region, best get it looked at as stated Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted September 30, 2012 Share Posted September 30, 2012 Is there any reason for them to by pass the pressure tank? There's probably an underlying issue with the sequential system that was never solved. Who did the conversion? Quote Link to comment Share on other sites More sharing options...
Dim Sum Posted September 30, 2012 Share Posted September 30, 2012 I will thanks. I live in Norfolk so there's not many garages that know supra's inside and out. Can anyone suggest a good supra garage? I have been to a "performance garage" where the dyno the car and it produced 304 bhp and 292 lbft. they said it seemed to be OK. To be honest with all the basic BPU been already done i thought it would produce more? As everyone have already mentioned, it needs to be checked because at around 300bhp that's n/a spec I think. Didn't think you can bypass the pressure tank because without it, correct me if I am wrong you will get boost issues. You can bypass the sequential system by doing the TTC. Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 1, 2012 Share Posted October 1, 2012 First off, your picture with the blue hose labelled "To pressure tank" is odd as that pipe should be connected to the BOV on the left of the picture. So you've got no recirculation when you come off boost. Secondly, the pressure tank, from what I've worked out, keeps the intake air control valve and the exhaust bypass valve open under certain conditions even when there isn't any boost pressure being generated by the turbos to work them. For example, gear changes, or coming off the throttle but still being above 4000rpm. The response on re-accelerating would be very poor if the second turbo had come offline and the first had to spin up to produce the boost to open it all up again. So the tank being bypassed isn't ideal, and the BOV should be plumbed in, but neither of them should result in the car being down in power overall. However it does indicate that there is probably another plumbing issue in there somewhere -Ian Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 1, 2012 Share Posted October 1, 2012 i think it might be a good idea to just double check all your plumbing these threads will help http://mkivsupra.net/vbb/showthread.php?35924-Sequential-turbo-hoses http://mkivsupra.net/vbb/showthread.php?35926-The-sequential-system Quote Link to comment Share on other sites More sharing options...
sideexitsupra Posted October 1, 2012 Share Posted October 1, 2012 Yes it should. It would be a good idea, by appointment, to take a trundle to Leicester and have Keron take a look at it. http://www.mkivsupra.net/vbb/member.php?676-keron Or Whifbitz in Enfield. Quote Link to comment Share on other sites More sharing options...
chris.neale Posted October 1, 2012 Author Share Posted October 1, 2012 (edited) Hi Guys, thanks for all your advice. Ian i have a hks bov installed which is connected as per the pictures. i was going to take the old bov out and plug the holes. Yeah your all properly right i need to sort the " plumbing" out as per the guides attached . I will have a go myself, if not as suggested I will take it to keron or whiftbiz when i get a full day spare. The guy in the garage reckon my greddy boost garage is wrong as it was only show .04-.05 bar boost max but as you all said the car should be boosting better then it is. Edited October 1, 2012 by chris.neale (see edit history) Quote Link to comment Share on other sites More sharing options...
Dr_Doom Posted October 1, 2012 Share Posted October 1, 2012 Is there anyone local to you that owns a TT? You could meet up with them and compare the hoses side by side so you can plumb them in correctly. Quote Link to comment Share on other sites More sharing options...
chris.neale Posted October 1, 2012 Author Share Posted October 1, 2012 Not that i know of supra's seem quite rare in Norwich now of days, but yes i might have to find someone. Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 2, 2012 Share Posted October 2, 2012 I know of two where in Norwich are you? Quote Link to comment Share on other sites More sharing options...
chris.neale Posted October 2, 2012 Author Share Posted October 2, 2012 I live in costessey - Norwich Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 2, 2012 Share Posted October 2, 2012 Drop me a PM, I'm quite close and so is Alex off here Quote Link to comment Share on other sites More sharing options...
Nic Posted October 2, 2012 Share Posted October 2, 2012 Drop me a PM, I'm quite close and so is Alex off here Feeling the love now Quote Link to comment Share on other sites More sharing options...
chris.neale Posted October 4, 2012 Author Share Posted October 4, 2012 Hi guys After starting going through the vacuum pipes, the top plastic hose coming off the pressure tank is broken. Does anybody know where i can obtain a replacement pressure tank from and is it difficult to replace? I presume is more fiddly then anything.? Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted October 4, 2012 Share Posted October 4, 2012 Ive got one in my garage if you want it. Quote Link to comment Share on other sites More sharing options...
Fizzy T Posted October 4, 2012 Share Posted October 4, 2012 This thread really proves how good this forum is,plenty of knowledge base and people offering their views and even people who will offer to get off their ass and go out there to help the guy by comparing their cars. Quote Link to comment Share on other sites More sharing options...
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