meister_raul Posted May 10, 2018 Share Posted May 10, 2018 I really didn't wanted to open a new thread but I really don't know what to do anymore. My car is an 1994 TT JDM Bpu auto supra, 360hp on the dyno. As far as I know it has a greedy intercooler, HKS SSQV Dump Valve and it's delimited. So here it goes: My car doesn't pull as it did at the beginning, turbo seem to kick after 4500rpm (when he wants) when it hits 1 bar but till then i get 0 or around 0.4 bar pressure. Kick down works just fine but the turbo seem to boost when he wants, if i don't get any boost, i floor it again and it seems to work (but ONLY after 80 km/h) In first gear I don't get boost at all, it just pulls very high. I put it in TTC and found a bad VSV, from the wastegate, then she made 360 on the dyno. I changed the vsv ( and checked all other) but there is no change. I even did a Boost leak and found a big hole in a intercooler rubber hose, change it, STILL THE SAME!! I mean there is no difference, my car made 1 bar exactly like before and it behaves exactly.... I am pretty sure I don't have any bad pipes because I couldn't hear any when I did the boost leak test. Till now, car worked very good, i even felt when the first and second turbo boost. Could this be a bad conection problem? or an ecu? Please help Till now I did a boost leak test, checked all vsv, changed some hoses who looked bad. Other details: -engine gets a bit hot -there is some oil spit from the BOV -no error codes found Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 10, 2018 Share Posted May 10, 2018 Bov Quote Link to comment Share on other sites More sharing options...
meister_raul Posted May 10, 2018 Author Share Posted May 10, 2018 here is a video Quote Link to comment Share on other sites More sharing options...
meister_raul Posted May 10, 2018 Author Share Posted May 10, 2018 What about it? Quote Link to comment Share on other sites More sharing options...
Tommyd16 Posted May 10, 2018 Share Posted May 10, 2018 Could turbo oil seals going depending on how much oil is coming from the bov Quote Link to comment Share on other sites More sharing options...
meister_raul Posted May 11, 2018 Author Share Posted May 11, 2018 There is some oil but not very much and my engine doesn't burn oil...level is fine Quote Link to comment Share on other sites More sharing options...
meister_raul Posted May 11, 2018 Author Share Posted May 11, 2018 The car pulls fine after 80km/h (2 gear) and 4500 rpm...like in the video Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 11, 2018 Share Posted May 11, 2018 This may help direct you to things to look at http://www.mkivsupra.net/vbb/showthread.php?35926-The-sequential-system Quote Link to comment Share on other sites More sharing options...
meister_raul Posted May 11, 2018 Author Share Posted May 11, 2018 I will take a look back again. Here is the dyno run with ttc Quote Link to comment Share on other sites More sharing options...
inazone Posted May 12, 2018 Share Posted May 12, 2018 Have you changed the two small black interconnect rubber pipes which link the turbos together? If you haven't then I suspect that the inside of the pipes has collapsed which causes a major restriction. On the outside they will look fine but the inside has a concertina construction which balloons and restricts the flow. Quote Link to comment Share on other sites More sharing options...
Samurai 20V Posted May 12, 2018 Share Posted May 12, 2018 http://www.mkivsupra.net/vbb/showthread.php?317455-Boost-Issue-on-BPU-TT6-New-problems Check from post #12 Quote Link to comment Share on other sites More sharing options...
meister_raul Posted May 14, 2018 Author Share Posted May 14, 2018 Have you changed the two small black interconnect rubber pipes which link the turbos together? If you haven't then I suspect that the inside of the pipes has collapsed which causes a major restriction. On the outside they will look fine but the inside has a concertina construction which balloons and restricts the flow. /QUOTE] You were right. Thank you! Good thing that I got a set of spare turbo's with most of the hoses. The one from the first turbo was pretty restricted. - Quote Link to comment Share on other sites More sharing options...
inazone Posted May 14, 2018 Share Posted May 14, 2018 You were right. Thank you! Good thing that I got a set of spare turbo's with most of the hoses. The one from the first turbo was pretty restricted. [ATTACH=CONFIG]227135[/ATTACH] -Excellent, glad you found the issue! Same happened to me. [emoji3][emoji106] Quote Link to comment Share on other sites More sharing options...
meister_raul Posted May 14, 2018 Author Share Posted May 14, 2018 I finally solve this problem! thank you guys! After I dismountet the pipes from the turbos and checked EGBV, wastegate and all the vsv I found no issue, so I', guessing it was that rubber pipe from the pic above which restricted the air. It was a all day work but I least I got the satisfaction in the evening! The previous owner gave me a big blue folder and I learned how the sequential system works. Here are some pics to help others: Quote Link to comment Share on other sites More sharing options...
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