TBDevelopments Posted December 23, 2012 Share Posted December 23, 2012 I've done a search but either i'm searching for the wrong thing i can't seem to find any information on this. Finally get the car back on the road after my radiator fiasco, took it for a run and yet another problem comes up, I'm sure this car is cursed. Put my foot down in 3rd and 4th gear, TC light flashes a little because its damn but doesn't cut into snow mode, pulling hard 1.2bar. Go into 5th gear and flat as a fart, no boost what so ever. WOT and 0psi on the gauge. I first thought its gone into snow mode, reset it and nothing. Turned the TC off and still nothing. Figured it was just an IC pipe from the badly fitted radiator I brought it home. Checking today all IC pipes are on hard, checked all the vacuum lines and from what i can tell all are fine. Reset the ecu still nothing. Took it for a test after it was left overnight and still nothing. Any gears floor it 0psi on the boost gauge, You also can't even hear the turbo spooling up to suggest a pipe has come off and the boost isn't reaching the Throttle body. Any ideas? Also this happened between gear changes, no knocks or bangs or anything like that, just when I changed gear the boost didn't return when the clutch was lifted and WOT. It feels very similar to when in SNOW mode, except you can activate snow mode in this state you can feel the power drop even more because of the TB butterfly. This is just like driving a Non Turbo, But drives and idles perfectly just no boost or the hint or sound of it trying to boost. Again no smoke or rattles/bangs to suggest a catastrophic turbo failure on #1 Tim Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted December 23, 2012 Share Posted December 23, 2012 0psi on the gauge suggests to me theres a hose popped off somewhere, otherwise the gauge would show constant vacuum. Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 23, 2012 Share Posted December 23, 2012 odd , if you cant hear the turbos maybe take the pipes off and have a look at them,you should be able to hear them even when reving stationary.i know thats no help at all but what your saying is not common Quote Link to comment Share on other sites More sharing options...
Dim Sum Posted December 23, 2012 Share Posted December 23, 2012 Maybe you could try TTC mode and test the turbos, if you get boost in that mode at least you know the turbos are fine and means it something to do with the hoses. Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted December 23, 2012 Share Posted December 23, 2012 put car in ttc mode and go for a drive. will show you if its vac related. Quote Link to comment Share on other sites More sharing options...
listy Posted December 23, 2012 Share Posted December 23, 2012 Has the hose popped off the gauge? Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 23, 2012 Author Share Posted December 23, 2012 the boost gauge is working properly as it does read vacuum when on idle or any other time. When you drive a non turbo car the gauge would always show 0psi when at WOT anyway. Going through the sequential diagrams i'm trying to figure out what control solenoid would have the ability to hold the wastegate open on the 1st turbo. Apart from a turbocharger failure this is all it can be, any leak from the IC hoses would cause the turbocharger to overspeed anyway and the normal whine caused from the 1st turbo would be elevated. In my case its totally silent. There must be a control solenoid that can force the #1 turbo wastegate open as this must also be in play when in "snow" mode as you can't create anyboost in that situation either, and again no turbocharger spool sound. similar to what i'm getting here. Also someone said in another post about testing for a failed 1st turbo to take the car out and rev till redline, if you are getting nothing upto 4000rpm and then boost from the 2nd turbo starts to come through this would show a failed 1st turbocharger, likewise if you get boost then nothing after 4000rpm would suggest failed 2nd turbocharger. But i'm getting nothing, WOT and 0psi to redline. Tim Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 23, 2012 Author Share Posted December 23, 2012 Tcc mode easy enough to swap into? i know on the apexi power fc ecu its switchable by the press of a button but never done it manually before Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted December 23, 2012 Share Posted December 23, 2012 yep 2 hoses and 5 mins. there is a guide on here. Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 23, 2012 Author Share Posted December 23, 2012 i did a search and the guy who wrote it said that this would only work if there wasn't any vacuum leaks in the system while doing the conversion, I'm pretty sure its a leak or broken solenoid over something serious like turbocharger failure, so if it is a leak then surely going Tcc wouldn't help me either? Tim Quote Link to comment Share on other sites More sharing options...
listy Posted December 23, 2012 Share Posted December 23, 2012 If there was no bang then turbo is probably ok. Sticky wastegate? Quote Link to comment Share on other sites More sharing options...
Dim Sum Posted December 23, 2012 Share Posted December 23, 2012 If the first Turbo ain't kicking in and you think its the solenoid it could be the one in front of the sequential system, that should be related to the first turbo. but if you are getting some boost and the second one ain't kicking in its probably the solenoid on top of the turbo pipes. If someone local can swap the solenoid over to let you test it, that be one way to test if it is working. Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 24, 2012 Author Share Posted December 24, 2012 there isn't really anyone that local that would mind me stealing parts off there car for diagnostics reasons lol. But as you said not getting any boost at all, from 2000rpm through to redline just 0psi on the gauge and not even a hint of turbo activity or sounds. Tim Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 24, 2012 Share Posted December 24, 2012 there is only one waste gate on the twin set up which no1 turbo the second turbo one is sent to the first then opened to let the second on spin, so there is only a couple of things this can be ! i would take the 1st turbo intake off( 3 bolts) and see if you can spin the turbo with you finger or see if you can see if the turbo acuator are has come displaced. i dont even know about snow mode? mine only has trac and i swear i cab still make a little boost with that active this might help http://mkivsupra.net/vbb/showthread.php?35926-The-sequential-system Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted December 24, 2012 Share Posted December 24, 2012 there isn't really anyone that local that would mind me stealing parts off there car for diagnostics reasons lol. But as you said not getting any boost at all, from 2000rpm through to redline just 0psi on the gauge and not even a hint of turbo activity or sounds. Tim But you are getting boost, the gauge is reading 0psi, so there is positive pressure over and above the manifold vacuum. Are you 110% sure all the pipework from turbos to manifold is ok? Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted December 24, 2012 Share Posted December 24, 2012 Have you checked all hoses? Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 24, 2012 Author Share Posted December 24, 2012 But you are getting boost, the gauge is reading 0psi, so there is positive pressure over and above the manifold vacuum. Are you 110% sure all the pipework from turbos to manifold is ok? But I'm not getting boost, 0psi on a boost gauge isn't boost its equalisation of the system. Fit a boost gauge to a non turbo car you will get the same, it'll move around in vacuum while driving normally, as soon as you floor it the restrictions of the TB are removed and the engine sucks in air freely, the gauge will then just to 0, its only when the turbos come into play it can increase from there. Yes all hoses checked, IC and vacuum and all connected ok. Vacuum hoses are all brand new as Jurgen fitted them when doing BPU for Geo before i collected the car. been through the full map and all connected and nothing looks split Tim Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 24, 2012 Author Share Posted December 24, 2012 right going to a have a few mins on it today between the family stuff, got to take this logically. Looking through the map the wastegate on #1 has no controls to force it open by the ecu, its a direct pressure feed from the compressor housing, through a vsv and back into the unpressurised intake pipe work. So this would only allow pressure to be vented from the wastegate to raise boost not lower it. So would always allow the boost to increase to a certain point. And believe spring pressure on that unit is 11psi The other option is the AICV valve is stuck open, this would mean that any air produced by #1 wouldn't compress in the intake showing a pressure on the gauges but would just pass back through #2 and out the airfilter cancelling anything being sucked in, this would also stop there being any noise being produced like turbo induction which is what i'm hearing. Because the AICV is connected to the pressure tank via a ecu controlled VSV it could be forced open under ecu control, and if so the ecu would also then stop the other VSV from opening allowing the 2nd turbo to activate. There also also a few mechanical failures that could be happening, Turbine has snapped off the #1 turbocharger not allowing it to spin up or create boost (although 2nd turbo should be uneffected) Wastegate on #1 is stuck open again not allowing it to boost (2nd turbo again should be uneffected) Tim Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 24, 2012 Author Share Posted December 24, 2012 OK problem solved haha, feel really stupid now. lol Took it out today to do a proper test as its been heavy rain here I've not really had an extensive look over it, Anyway took it out today and without the rain I could have the windows open and you can hear #1 turbo spooling, where before I couldn't hear anything. probably the heavy rain muffled it out. So because of that it can't be a control issue or mechanical fault, it can only be 1 thing. IC pipe work or blown IC. Anyway got it over to my workshop and got it on the ramp, soon as I lifted the car it was smack in-front of me, the one that joins the IC under the plastic tray, that's why I couldn't see it from the top. feel really stupid now, should have had a prober look on the ramp before posting anything really. Either way its done its job as i bought the supra to expand the business and be an education and this has forced me to learn the operation of the sequential systems. thanks anyway guys for reading and trying to help Tim Quote Link to comment Share on other sites More sharing options...
Dragonball Posted December 24, 2012 Share Posted December 24, 2012 Wish I had a quid for every time... :-) (including the panic I had when it first happened to me!) :-) Quote Link to comment Share on other sites More sharing options...
mellonman Posted December 24, 2012 Share Posted December 24, 2012 haha how many times was it said, live and learn Quote Link to comment Share on other sites More sharing options...
Graham1984 Posted December 24, 2012 Share Posted December 24, 2012 The joy of problem solving via the forum. Glad you have it sorted anyway mate and can hopefully enjoy the car now. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted December 24, 2012 Share Posted December 24, 2012 So you 110% hadnt checked the intercooler pipes If youre getting 0psi youre getting boost, thats a fact. I know this because its happened to me more than once Top tip with turbo cars is- Simple things first. Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 24, 2012 Author Share Posted December 24, 2012 haha yeah I know, wasn't really a panic but do feel really stupid now seeing this is what i do day in/day out for a living. just really didn't want to go down the workshop after i locked it all up for Christmas, but after going over the vac system etc figured get my arse in gear and put it on the ramp, once i lifted it the problem was smacking me in the face lol. Although the trip without rain and hearing the turbo spool kinda pointed towards IC pipes as there isn't anything else it could have been. Tim Quote Link to comment Share on other sites More sharing options...
TBDevelopments Posted December 24, 2012 Author Share Posted December 24, 2012 So you 110% hadnt checked the intercooler pipes If youre getting 0psi youre getting boost, thats a fact. I know this because its happened to me more than once Top tip with turbo cars is- Simple things first. yeah yeah rub it in with the pipes lol But i obviously wasn't getting boost as the pipe was totally disconnected from the IC and the gauge reads from the manifold. 0psi is just atmospheric pressure on the gauge. Quote Link to comment Share on other sites More sharing options...
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