Ricky N Member 93 Member For: 15y 7m 25d Gender: Male Location: QLD Posted 13/04/09 12:44 AM Share Posted 13/04/09 12:44 AM The BA/BF / GT35R turbo and FG T04S/GT35R turbo have a few reasons why they are failing.Most of which can be avoided.The biggest problem starts with the Ford sales person. The Ford salesman will tell the new buyer that the new turbos don’t need to be idled down. This is not true. The Ford salesman probably has no idea or will tell you anything to get you to buy the car.The turbo needs to be idled down after use for a few reasons.1) When the turbo is hot shut down the cooling system for the turbo stops and the temperature of the turbo skyrockets. The residual oil left in the turbo and oil feed line cooks. It turns into carbon and starts to block the oil feed to the turbo. Over time it will completely block the oil feeding the turbo. The carbon is also wearing the bearings much faster. The oil also bakes onto the bearing races and balls. Further wearing them faster than they should and can cause harmonics leading to turbo failure.2) The factory turbos have a Phenolic bearing cage. Phenolic is a compressed resin fibre. In laminas terms its plastic. When it is over temped is can melt and/or it goes brittle and fails causing the end of your turbo.3) Unfortunately the GT35R suffers from head droop. On hot shut down the turbo is sitting there not spinning with a super hot shaft. Metal is at its softest when it is hot. So the turbine head droops from the weight. Once this happens the turbo is no longer balanced. When something spinning over 100000rpm is not balanced it usually stops sinning very quickly.The above three problems can all be easily be avoided by. Idling your car down before shutting it off. Regular oil changes. I recommend every 5000kms. Replacing the oil feed line for the turbo every 30000kms. Its only like $140 from for Ford including the inline filter. If you are just learning this now or have just bought a second hand car changing the oil feed line now could save you thousands.The last problem there is nothing you can do about. The factory Ford / Garrett GT35R turbine is made from GMR. GMR is the normal low temp material used for turbines. It’s usually used for diesels. For the modifiers when you start boosting the turbo up the exhaust gasses get hotter. Eventually the GMR material starts to break down. Usually out on the tips of the turbine. It not uncommon to pull the exhaust housing of a GT35R to find what looks like something has been hitting the turbine. Nothing has been hitting the turbine. The tips have started melting off and coming apart. Once this happens the turbo is no longer balanced.Unfortunately there is nothing that can be done to stop this unless an Inconel turbine is fitted. And Garrett doesn’t make an Inconel GT35R turbine. Regards,Ricky. Link to comment Share on other sites More sharing options...
typhoon_freak Cryptic Clothing Company Donating Members 4,556 Member For: 16y 4m 7d Gender: Male Location: Brisvages, Capalaba Posted 13/04/09 12:48 AM Share Posted 13/04/09 12:48 AM awsome write up.. letting the turbo cool down.. is this only for if u have been giving the car a bit of juice? or cud I turn it off if I have been just putting it around? Link to comment Share on other sites More sharing options...
straughsberry Donating Members 1,846 Member For: 17y 2m 30d Gender: Male Location: Broady, Melbourne Posted 13/04/09 01:07 AM Share Posted 13/04/09 01:07 AM Thanks for the write up. Everything here is common sense. However, I would not be using the oil feed line and filter from Ford. Get yourself an after market setup from one of our sponsors which has a decent filter in the system. The Ford oil screen can clog and reduce oil flow to such an extent that you can eventually cook your turbo. The oil screen was only there to pick-up left over casting sand when the motors were new. In fact, Garret wouldn't provide their product without it. And if you need to upgrade or recondition your turbo, you can get a steel bearing cage for them. Not cheap though. Link to comment Share on other sites More sharing options...
Ricky N Member 93 Member For: 15y 7m 25d Gender: Male Location: QLD Posted 13/04/09 01:22 AM Author Share Posted 13/04/09 01:22 AM It’s a brass bearing cage. And yeah it’s more than double the price of the regular bearing pack. And the turbo will spool slower because the brass bearing cage is heaps heavier. Link to comment Share on other sites More sharing options...
Ricky N Member 93 Member For: 15y 7m 25d Gender: Male Location: QLD Posted 13/04/09 01:27 AM Author Share Posted 13/04/09 01:27 AM awsome write up.. letting the turbo cool down.. is this only for if u have been giving the car a bit of juice? or cud I turn it off if I have been just putting it around?20 to 30 seconds for light driving duties.2 to 3 minutes for heavier traffic or if you have been constantly accelerating or on boost.5 minutes plus if you have been giving it a good flogging Link to comment Share on other sites More sharing options...
typhoon_freak Cryptic Clothing Company Donating Members 4,556 Member For: 16y 4m 7d Gender: Male Location: Brisvages, Capalaba Posted 13/04/09 01:33 AM Share Posted 13/04/09 01:33 AM ok sweet. thanx for that Link to comment Share on other sites More sharing options...
YPURV4 KILL,KILL,KILL,DIE,DIE,DIE, Member 2,813 Member For: 18y 6m 13d Gender: Male Posted 13/04/09 01:43 AM Share Posted 13/04/09 01:43 AM So are you saying a turbo timer should be used ???If you say its a good idea this is going to be a gret thread Link to comment Share on other sites More sharing options...
Superdan Well-Hard Bangin' Member Member 3,422 Member For: 17y 2m 28d Gender: Male Location: Perff, WA Posted 13/04/09 02:47 AM Share Posted 13/04/09 02:47 AM Yeh wouldn't a turbo timer help out with most of these issues?? Link to comment Share on other sites More sharing options...
gregor Member 459 Member For: 16y 2m 27d Posted 13/04/09 02:53 AM Share Posted 13/04/09 02:53 AM im not a fan of turbo timers but they arent a bad idea if you are the sort of person who will drive it hard until they get into their driveway. I'd rather just take it easy a few minutes away from my destination to let everything cool down though. Link to comment Share on other sites More sharing options...
F6_jase Donating Members 322 Member For: 16y 1m 2d Gender: Male Location: Mooloolaba, QLD Posted 13/04/09 03:13 AM Share Posted 13/04/09 03:13 AM I didn't think the oil cooking problem was as bad these days with the water cooled turbo's like the fords run? Link to comment Share on other sites More sharing options...
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