Question about 1996 Toyota Celica

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Complete loss of boost

Hi i have a 1991 celica gt4 which appears to have scrapped the turbo although im not entirely convinced. It happened the other day under heavy acceleration at first there was a loud bang followed by a ploom of blue smoke. The car still drives [just] it is very under powered and regestering 0 psi on the boost gauge. I should also say that when i took the air intake off the side of the tubo housing i noticed the nut had managed to spin itself free despite being a left hand thread.The fins still span freely with slight play in the shaft I tightened the nut back up the best i could by jamming the fins. I was quite optamistic that the shaft spinning whilst not fixed tightly to the fins was the cause of the problem however the problem remains. Before i go spending money on a turbo i was wondering as the turbo bearings seem fine weather or not something else could be the problem ie piston rings although im not sure this would results in complete loss of boost.

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  • kevgkelly Jan 12, 2009

    nice 1 mate you was spot on. Before i started striping down the turbo i borrowed a snap on endoscpe romoved the oxygen sensor from the exhaust manifold and fed the camara down. Yep totally f#/ked. The exhaust wheel due to being ceramic had completly smashed to pieces why there ceramic im not sure because its very brittle. It wont be a problem in future any how because the company that are going to re-con the turbo say that the fins have to be replaced with steel ones as they cant get ceramic ones. I was only running 15 psi when the turbo let go is this to much i was told the ct 26 was good for 1.3 bar.

  • kevgkelly Jan 28, 2009

    hi i managed to sort out my turbo i ended up buying a ct20b turbo of a gt4 st205 its still ceramic but it has a larger compressor wheel. im actually really pleased with new one it takes a little longer to spool up but it pulls all the way to the red line i was so pleased in fact i went and brought myself a shiny new front mount intercooler and it looks mean. however since installing the intercooler i have not been able to boost over 12 psi without hitting fuel cut despite having a fuel cut defender. my first thought was that the turbo pressure was kaput and i was just going to replace it on the off chance until i found out toyota wanted £230 for a new one. so i cut the pim wire to the ecu and dissabled fuel cut completly or so i thought. i dont understand how this can still be happening as i thought fuel cut was a fail safe for over boosting, therfor if u disconnect the turbo pressure sensor you disconnect fuel cut. i should also say that when installing the intercooler pipes i had to relocate the air filter and now the airflow meter is now positioned on its side, weather this should result in fuel cut i am very doubtful but everything was fine before the intercooler installation. ANY help would be much appreciated

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Yup your turbo is toast, ive had the same thing happen on a nissan skyline. The smoke you describe is the oil escaping from the turbo core and burning off in the dump pipe.Even though you managed to get the nut back on the compressor wheel the damage to your exhaust wheel, bearings and shaft is already done, chances are you'l be missing a few fins in the exhaust wheel to say the least, it would've propelled itself in the exhuast housing probably spinning at atleast 25,000 rpm.The turbo in the gt4 is a stong unit, just how much boost were you running? :)

Posted on Jan 12, 2009

  • Vince Jan 12, 2009

    Hi, They make the exhaust wheel and shaft out of ceramic because its lighter and can spool up faster, the downside is its not as strong as steel and can't handle as much boost, which is no good for people like you and I :) i would have to say IMO that 15 is absolute max i would run on a ceramic wheel turbo. Im still running the factory ceramic turbos in my skyline GTR and running 15psi but theres two turbos sharing the load, Ive been running that boost for 5years and still running strong. The skyline i had before that is the one i spoke off that the turbo did exactley what yours did, but when i was taking if off the exhaust wheel and shaft had shot into the exhaust...but anyway ask the turbo shop how much extra to put on a slighty bigger compressor wheel, it'll make make the same boost without having to spin so fast which will keep the intake temp down. Let me know how it goes, i like the gt4s.

  • Vince Jan 29, 2009

    Hi, Good work on the slightly bigger compressor wheel, it does make a difference but theres alwaya a tradeoff in low end response, thats just how it goes. Kinda weird about the "fuel cut" tho, Youve got to remember that every modifcation you do will throw your factory ECUs tune off more and more, but not enough at this stage to cause a fail safe to kick in i shouldnt think. Every make of car has its different failsafe setting some higher than others and im not to familiar with the GT4s. I think this we niggle you have will only be sorted by illimination, i dont think the AFM mounted on the side should affect it. Have you tried resetting the ECU at all? checked all your joiners and clamps on the piping and intercooler...there may be a point where air is only escaping under boost and it will feel like its hit some kind off cut off? and ill think of somemore likely causes ill keep checking in to see if youve replied with some more info, hopefully we can narrow it down.

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