Guest ms_supra Posted July 28, 2008 Share Posted July 28, 2008 Hey, Just bought my first supra a few weeks ago, but cant drive it at the minute, so hopefully you guys can help me out, please read below: I bought the car of a family friend who had it for 6years, Its a j-spec supra twin turbo, 1993, auto, with a front mounted intercooler and a electronic valve controller. the car had been parked up on their drive for about a year, they said the turbos dont work, so once i got it back to my house i stripped off the two turbos, the back one was leaking alot of oil and the front one had a few chips on the fins. Anyway i bought two turbos of "bolarbag" from this forum who also has been very helpful, i fit them last weekend, and when i started it up everything sounded fine but still no boost, the boost gauge shows it not going over 0bar at all, also i cant not hear the turbo whistle! Now im not too good with turbo cars so i do not have a good understanding on how they work, could the evc be causing any problems? when i rev it the wastegate actuators dont open or move. The car has had one cat removed with a straight through system, without a restrictor ring fitted! Does anyone know what the problem could be? Thanks Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 28, 2008 Share Posted July 28, 2008 If you don't fully understand this very complex system fixing it will probably be a matter of luck, it would make far more economic sense to take it to an expert and you get on with doing what YOU do to make money, and just paying to have it sorted. It could be a vast array of things, either individual or combined that cause no boost. Quote Link to comment Share on other sites More sharing options...
bolarbag Posted July 28, 2008 Share Posted July 28, 2008 I was actually wondering how you got on, we all have to start somewhere mate, but a sequential turbo setup probably isnt the best starting point, take it to a specialist, to diagnose where you have went wrong on the re-install, As a matter of point though, if your not getting boost then it can't be plumbed in right, especially since the wastegates are shut - remember use MY wastegate and actuators, you dont know if the previous ones had a problem(sticking e.t.c) which lead to the failure of turbo2 In short, go see a specialist:) Quote Link to comment Share on other sites More sharing options...
Guest ms_supra Posted July 28, 2008 Share Posted July 28, 2008 Thanks for refering me straight to a specialist guys! That is not the reason i started this post is it! If the problem can be a easy fix then i would like to save the hassle of getting it trailered to a garage and pay them £££ by the hour for them to tell me it is a hose on the wrong way or a accuator is not working! Non of my cars have ever gone to a garage as i am a mechanic, i just dont understand the turbo setup thats all i am saying! But if i cant find the problem myself then of course it will go to a specialist. All im after is some ideas on what it could be, i have been reading up on previous posts with people who have similar problems. Is there anyone who has had this no boost problem before? Thank you Quote Link to comment Share on other sites More sharing options...
bolarbag Posted July 28, 2008 Share Posted July 28, 2008 Mate I wasn't fobbing you off, but as I said before I can only go so far with remote diagnosis, as I have said before it sounds like a plumbing issue, I hope we both agree that the turbos supplied were in mint condition So assuming they are free to spin via exhaust gases then you should have no problem gathering boost, as long as there is a direct path from compressor to inlet header, wastegates have no bearing on this unless they are stuck open A specialist is not going to charge you a fortune just to look at it, a 'mechanic' may;) As you have all the parts there then its only a matter of piecing them together, but we all have to bite the bullet sometime Taking it to a specialist is sound advice as if you have plumbed it in wrong then you may be at risk of overboosting the turbo's once they do gather boost, you dont want to shell out on another set or worse still do your engine any damage Quote Link to comment Share on other sites More sharing options...
Scooter Posted July 28, 2008 Share Posted July 28, 2008 Non of my cars have ever gone to a garage as i am a mechanic, i just dont understand the turbo setup thats all i am saying! But if i cant find the problem myself then of course it will go to a specialist. All im after is some ideas on what it could be, i have been reading up on previous posts with people who have similar problems. Hi you need to find someone near by that will lend you one of CJ manuals. They are a full copy of the Toyota mechanics reference manual and give a complete trouble shooting/diagnostic etc table. I can look up the 'nil boost' section but there will undoubtably be multiple pages to procedures following. If you can get a look at one of these manuals then you'll be in a far better position to start to isolate the problem........... Quote Link to comment Share on other sites More sharing options...
Guest ms_supra Posted July 28, 2008 Share Posted July 28, 2008 Bolarbag - i know mate as you have been very helpful when i bought the turbo's off you, if it is a big problem then i know it will have to go to a specialist but i would like to do a few tests myself incase it is something simple....hopefully. Scooter - Thank you i will look into getting hold of some manuals, Does anyone have any diagrams of how all the air pipes are connected up? Cheers, Quote Link to comment Share on other sites More sharing options...
colsoop Posted July 28, 2008 Share Posted July 28, 2008 Whereabouts in west midlands are you ? Quote Link to comment Share on other sites More sharing options...
Guest ms_supra Posted July 28, 2008 Share Posted July 28, 2008 Im located in coventry mate, cheers Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 28, 2008 Share Posted July 28, 2008 I think if you took the stock turbos off and refitted them yourself, then you are more than qualified enough to do your own work on the car People need to read the whole post, hmmm? Anyway. Have a look here: http://www.mkivsupra.net/vbb/showthread.php?t=35926 and here: http://www.mkivsupra.net/vbb/showthread.php?t=35924 For a writeup on the sequential system, some handy piccies, and a map of how the sequential system works. Also this: http://www.mkivsupra.net/vbb/showthread.php?t=35925 Might help for locating some bits in the engine bay. Chances are in swapping the turbos you haven't gone anywhere near the FMIC, and a hose has come off somewhere in the area that you haven't spotted yet. -Ian Quote Link to comment Share on other sites More sharing options...
Guest ms_supra Posted July 28, 2008 Share Posted July 28, 2008 Thank you Ian, i didnt want to sound harsh to the guys above as i know they are just trying to help. Im glad you know where im coming from. There might be a pipe that is not connected right or connected at all, the guy who had it before me did say he had a set of turbo's put on it 3years ago and the garage he took it to were not experienced(muppets) and ever since then it just has not run right, but did build a little bit of boost before the second set of turbo's went(oil seal) Now the ones i have put on are a good set of turbo's from "bolarbag" There must be a reason why his old turbo's did not last very long? that is why im thinking there is a problem with the pipe work connections. Anyways, Im going to have a read through it all now thanks for the info mate. Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 28, 2008 Share Posted July 28, 2008 I suspect they may have overspeeded if there was a big leak and the car was constantly used, they would spin up and try to pressurise the planet's atmosphere Either that or it was an installation issue. -Ian Quote Link to comment Share on other sites More sharing options...
Ewen Posted July 28, 2008 Share Posted July 28, 2008 The original post reads as though the car is stationary and being revved in neutral, hence no boost ? Quote Link to comment Share on other sites More sharing options...
Scoboblio Posted July 28, 2008 Share Posted July 28, 2008 The original post reads as though the car is stationary and being revved in neutral, hence no boost ? I thought that too, but kept quiet out of potential embarassment My auto TT never generated +ve boost in neutral. Quote Link to comment Share on other sites More sharing options...
Guest ms_supra Posted July 29, 2008 Share Posted July 29, 2008 Looking back at the post i see where you guys are coming from but thats just me not explaining it right, i have been out in the car on a "private" road a couple of times trying it at different speeds but still i dont get anything, i didnt want to really put my foot down incase i caused any damage. After reading up on other posts i think it is the FMIC, would that be the cause of the no-boost? The intercooler on there at the minute does look very old, How long do these normally last without any problems? Thanks, Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 29, 2008 Share Posted July 29, 2008 Looking back at the post i see where you guys are coming from but thats just me not explaining it right, i have been out in the car on a "private" road a couple of times trying it at different speeds but still i dont get anything, i didnt want to really put my foot down incase i caused any damage. After reading up on other posts i think it is the FMIC, would that be the cause of the no-boost? The intercooler on there at the minute does look very old, How long do these normally last without any problems? Thanks, What sort of problems are you envisaging from this old FMIC? Quote Link to comment Share on other sites More sharing options...
Guest ms_supra Posted July 29, 2008 Share Posted July 29, 2008 The boost is leaking from somewhere and i suspect it is the intercooler itself as the pipe work looks ok, have you come across this problem before? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 29, 2008 Share Posted July 29, 2008 It would have to be a very visible hole, quite obvious to the eye, to leak all the boost to give zero pressure. It won't be that if it looks OK. Pipework to and from it is far more likely an area for trouble. Quote Link to comment Share on other sites More sharing options...
Guest ms_supra Posted July 29, 2008 Share Posted July 29, 2008 Could it be the intercooler itself not allowing a free flow? Quote Link to comment Share on other sites More sharing options...
bolarbag Posted July 29, 2008 Share Posted July 29, 2008 (edited) You would still get boost though, Why dont you do a test, fit a pipe(rubber or similar) for the compressor to the throttle and go a small(Very small) drive, see if you gather boost then, this rules out both the piping and the IC Edited July 29, 2008 by bolarbag (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 29, 2008 Share Posted July 29, 2008 Could it be the intercooler itself not allowing a free flow? Unless someone has filled it with concrete, no. Quote Link to comment Share on other sites More sharing options...
Guest ms_supra Posted July 29, 2008 Share Posted July 29, 2008 Thanks mate, i will do that check at the weekend along with the others, but yeah i will take it very slow and make it a quick drive. Quote Link to comment Share on other sites More sharing options...
Jim_1979 Posted July 29, 2008 Share Posted July 29, 2008 I would personally check all intercooler piping connectors. Also get a vaccume diagram and make sure everything is plumbed in as is. My car wasn't when I got it and it solved a boost issue for me. Also check all the VSV's etc. None of the above is hard to do mate. You should be ok. Quote Link to comment Share on other sites More sharing options...
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