Rashed Posted September 8, 2018 Share Posted September 8, 2018 Hey guys, today I decided to put my vvti tt6 supra on the dyno to see what sort of power it would make before I went BPU spec. Car: 2000 Toyota Supra VVTi 2jzgte manual Kakimoto catback exhaust Hks intake As you can see it just about made 192bhp and the boost massively falls off after 3500 rpm which shows the 2nd turbo isnt coming on at all!?!?! The car had fresh plugs, oil and filter recently too. Any thoughts? Looks to me as a boost leak or vaccum leak? But I dont know where to start or look or how to even tackle the issue. Any help much appreciated! Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted September 8, 2018 Share Posted September 8, 2018 Put car in TTC mode. If you get boost across both turbo's then you know you are dealing with either a plumbing or VSV issue. Quote Link to comment Share on other sites More sharing options...
and1c Posted September 8, 2018 Share Posted September 8, 2018 http://mkiv.com/techarticles/ttc/ttc.htm Quote Link to comment Share on other sites More sharing options...
JasonR24 Posted September 8, 2018 Share Posted September 8, 2018 Put car in TTC mode. If you get boost across both turbo's then you know you are dealing with either a plumbing or VSV issue. Unless it’s the hose to the pressure tank then you still won’t get boost Quote Link to comment Share on other sites More sharing options...
Rashed Posted September 8, 2018 Author Share Posted September 8, 2018 Right I'll get all the boost pipes/hoses checked along with the valve and vaccum hoses too, also a smoke test should be helpful Quote Link to comment Share on other sites More sharing options...
Jellybean Posted January 21, 2019 Share Posted January 21, 2019 If the vacuum hoses where never changed I would swap out with Gates Racing , inexpensive , piece of mind Same as OE Vacuum Hose Sizes 4mm 3 metres 5mm 1 metre 6mm 1 metre https://www.ebay.ie/itm/330803508813?_trksid=p2060353.m1438.l2649&var=540090527961&ssPageName=STRK%3AMEBIDX%3AIT Quote Link to comment Share on other sites More sharing options...
SupraTRD_MK4 Posted January 22, 2019 Share Posted January 22, 2019 Thanks Jelly Bean. Sorry to hear the disappointment Rashed. Hope you find the issue and hopefully it isn't a turbo shot. Quote Link to comment Share on other sites More sharing options...
Scooter Posted February 6, 2019 Share Posted February 6, 2019 Another good source of info http://www.mkivsupra.net/vbb/showthread.php?35926-The-sequential-system&highlight=sequential Quote Link to comment Share on other sites More sharing options...
Rashed Posted May 4, 2019 Author Share Posted May 4, 2019 Sorry forgot to update this thread. It turned out to be a split vaccum hose which was replaced then I went ahead and went BPU....awaiting to put it on a dyno. Will keep you guys posted! Quote Link to comment Share on other sites More sharing options...
Supra-love Posted May 13, 2019 Share Posted May 13, 2019 If the vacuum hoses where never changed I would swap out with Gates Racing , inexpensive , piece of mind Same as OE Vacuum Hose Sizes 4mm 3 metres 5mm 1 metre 6mm 1 metre https://www.ebay.ie/itm/330803508813?_trksid=p2060353.m1438.l2649&var=540090527961&ssPageName=STRK%3AMEBIDX%3AIT Does this cover all the hose in the engine bay as this is something I want to do to mine! Cheers Quote Link to comment Share on other sites More sharing options...
Rashed Posted May 13, 2019 Author Share Posted May 13, 2019 If the vacuum hoses where never changed I would swap out with Gates Racing , inexpensive , piece of mind Same as OE Vacuum Hose Sizes 4mm 3 metres 5mm 1 metre 6mm 1 metre https://www.ebay.ie/itm/330803508813?_trksid=p2060353.m1438.l2649&var=540090527961&ssPageName=STRK%3AMEBIDX%3AIT Any guides etc? I would like to have a crack at this myself just for peice of mind Thanks again! Quote Link to comment Share on other sites More sharing options...
Jellybean Posted May 13, 2019 Share Posted May 13, 2019 Does this cover all the hose in the engine bay as this is something I want to do to mine! Cheers All the vacuum hoses, yes Quote Link to comment Share on other sites More sharing options...
Jellybean Posted May 13, 2019 Share Posted May 13, 2019 Any guides etc? I would like to have a crack at this myself just for peice of mind Thanks again! no need, it is very easy once you start doing it , just unclip the spring clips, take the hose off, cut to size , replace with new hose Quote Link to comment Share on other sites More sharing options...
Rashed Posted May 13, 2019 Author Share Posted May 13, 2019 no need, it is very easy once you start doing it , just unclip the spring clips, take the hose off, cut to size , replace with new hose Sorry what I meant was is there a guide to show where all these vacuum hoses are located to see which ones to replace? Sorry to come off as a total noob. Thanks again! Quote Link to comment Share on other sites More sharing options...
Jellybean Posted May 13, 2019 Share Posted May 13, 2019 Sorry what I meant was is there a guide to show where all these vacuum hoses are located to see which ones to replace? Sorry to come off as a total noob. Thanks again! They are all very visible once you have the hood up , in my experience what I found was, they may look good at initial glance but one of my hoses was split behind; visually I could only see after I removed it The Turbo side hoses, where brittle; finicky little buggers to remove Just start from the turbo side and work your way across ; I replaced them all (just of piece of mind); nothing worse than chasing a boost leak Took about 30 mins Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 14, 2019 Share Posted May 14, 2019 I'd take some digital pics as it's quite easy to forget what goes where in the maze of hoses. Some are coolant ones too, worth replacing but obviously will leak. Some faffy ones at the rear of the turbos that head round the back of the engine, if they've been on there years they aren't easy to remove for a novice, if you are sure you have the right ID hose to replace them you can cut them and rotate off with pliers etc. Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 14, 2019 Share Posted May 14, 2019 Some threads worth reading...... http://www.mkivsupra.net/vbb/showthread.php?312905-Replacing-Twin-Turbo-Link-Pipes&highlight=vacuum+hoses http://www.mkivsupra.net/vbb/showthread.php?132227-replacing-the-vacuum-lines&highlight=vacuum+hoses Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 14, 2019 Share Posted May 14, 2019 Careful with the plastic vsv's joints, these can snap, if you are a novice, then the best way to tackle hoses air or coolant is to try and break the seal, gentle rotation or putting a thin screw driver up/down the tube to break the years of stiction/friction (or simply cutting off, I say simply but even after years they are still quite tough so again mind that blade!), grabbing and yanking can give you breakages or sudden releases and skinned knuckles. You can get some pliers that push off hoses but you need a lip/backstop to push off of and there isn't always that on the Supra pipes. Also be aware that you can buy the correct internal diameter replacement hose but the external diameter might be larger/smaller than the oem originals and so any hoses with the spring clips might need different ones to be 100% secure. Quote Link to comment Share on other sites More sharing options...
Rashed Posted May 18, 2019 Author Share Posted May 18, 2019 So put the car back on the dyno today after the BPU mods. It made 365bhp at 1.1 bar. 1st & 2nd decat pipes Restrictor ring 255 fuel pump Fuel cut defender Intercooler hard pipes Hks intake kit Blitz EBC at 1.1 bar Kakimoto catback exhaust system 3" V power fuel V161 manual 2jzgte vvti Let me know what you guys think Quote Link to comment Share on other sites More sharing options...
Celicasaur Posted May 27, 2019 Share Posted May 27, 2019 Almost looks like the second turbo wasn't working on the first run and then you fixed it for the second run? Quote Link to comment Share on other sites More sharing options...
Rashed Posted May 27, 2019 Author Share Posted May 27, 2019 Almost looks like the second turbo wasn't working on the first run and then you fixed it for the second run? Yeah had a split on one of the vacuum pipes which was replaced and the car made 292bhp and now 365bhp with the BPU mods. Quote Link to comment Share on other sites More sharing options...
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