Hi guy iv got a gt28rs turbo fitted to my rs turbo (efi) that's almost new cover maybe a couple hundred miles but its got a bit of a whistling /high pitch sound coming from it.

Basically i had the turbo and new management fitted by quite a well known ford tuner but within a week the first gt28 turbo pack up because the tuner made a silly mistake and never check the oil flow through the resricter and there wasn't any so cooked the turbo but give the man his due he put his hands up and replaced it free of charge and now the new turbo is making a similar sound but no where near as loud.

Before i go back moaning as hes helped me a lot with the car i want to check to see how much oil is coming out the feed and restrictor. My question is if i crank the car over without it starting for 30 seconds with the oil feed going into a pot how much oil should i expect to see as i have no idea how much should be going through a bb turbo? Also the car originally had a t3 that i never fitted water feed to it so the tuner never put water cooling to the gt28ts is it ok to run a bb turbo with now water cooling it?

 

Some can cope, but unless it was intended to be run without water, I wouldnt do it.

 

When I had a gt28 I was told they need water cooling because they dont have much oil going through them to act as cooling

 

Makes sence lol. Do you know how much oil should be flowing through it?

 

I don't know how much should be going through sorry

 

use the water cooling, ball bearing turbos carry so little oil there is little cooling.
wthe reason you need water cooling is to keep the ball bearing cage intact as they are made from a plastic according to owen developments, so the water cooling is essential.
my gt3071r made a bit of a noise when running, but apparently it's normal due to the bearings doing their job or what not. was only noticeable on idle or switch off though, not so much on boost.

 

Il try take a vid of it later if its clear enough il post it up here and see what people think

 

what size restrictor are you running ?
you should run water but imo it wont make much odds, ive been through a noisy bb turbo myself you must check your oil pressure entering your turbo.
have you got an oil pressure gauge for your engine ?

 

fit a guage between your restrictor and the turbo oil inlet you need 45 psi warm oil flat out, when i got down to 10 psi my bb t51r was getting noisy made a high pitch noise at idle where there wasnt enough cushion of oil in the bearings.

 

bb turbos must have water cooling [ i'am sure ceramic balls don't need water though]
mesure the oil flow out of drain that tell you gal/hr but you only need this on wet bearing as bb turbos don't use alot sounds to me its getting to hot mate

 

i wouldnt ever run one without water cooling but id bet itl be oil related not water.

 

To be honest i dont know what size restructor is fitted as i never fitted the turbo myself but il try take the feed of in a bit if i get time and have a look.
No i dont have a oil pressure gauge fitted to the car but i do have one on my cossie that is off the road i could grab it off??

 

its worth checking as if your running a small restrictor and your oil pressure is on the low side it could be starving it, ive just fitted a 1.5mm restrictor in my r33 as the turbo feed was seeing 90 psi lol

if a 1.5mm restrictor still doesnt supply 40+ psi then the oil pressure is well down ime.
most people fit 0.6mm restrictors in the paranoia of overflowing it with oil and can end up under doing it and screwing the turbo up anyways.

 

Il pop down pirtek in the next couple of days and see if they have a t piece to attach a gauge or do you know of anywhere that i can get one from?

 

sorry mate don't know what your saying ,you wouid't run one with no water but the guy running no water on his bb turbo it must be the problem, not oil ,i would never use a restrictor only if the turbo smoked may be, but they restricted standard and don't need restricting any more not unless there is a problem ,i have enought cages here thats blued the cage and melted ball not enought oil cooling to the balls

 

Well iv ordered a couple of banjos and some pipe so ill fit that when it turns up. Dont look like im gonna get time to look at the car today so il try messing about with the oil feed tomorrow. Thanks everyone for the help

 

Just thinking outside the box but what is the oil pressure on an efi rs turbo when cold, hot, and through the rev range?

 

what im saying is it will be oil related causeing the problems not a lack of water, the little bit of water that passes around the housing will do naff all compared to the oil. i dare bet the engine has around 50 psi max oil pressure and theres a 0.6mm restrictor in there holding the oil back to around 15 psi feeding the stock restrictor which will make the turbo noisy through lack of lubrication.

 

get the restrictor out and see what size it is, you want 1.5mm maybe more if your pressure is down. just remove it for now completely and see if it sounds better i could instantly hear the difference once i got my oil pressure up to the turbo.
if it doesnt smoke and the seals hold up you dont need to run a rtestrictor anyway, my engine hits 110 psi cold start hence needs a restrictor.

 

Il give it a go and see what happens il also put my oil pressure gauge on the engine first to see what the oil pressure is

 

get it sorted get the cossie done then we can have a photo shoot

 

A CVH by the book only needs to hold 15psi at hot idle so the turbo is probably circulating the grand sum of naff all. IIrc its meant to be about 45psi at 3000rpm as well. Can get an oil pressure gauge for about £20 off ebay to give you a pretty good idea of what your actually running tho

 

I had a chance to have a play around with the car today i managed to fit a water feed to the turbo and remove the oil feed restrictor to have a look i was expecting to see a 0.6mm hole in the restrictor causing the problem but it wasnt it had a large hole about 3-4mm so it cant be that i also unpluged the coil and cranked the engine over with the oil feed pumping into a jug for about 15second and it pumped out 300ml so there no blockages. Iv got a pictuer of the restrictor and also took a vid of the car running to show the sound its making to be honest its worse then i thought and i think the turbo id as good as dead



So is it possible that the turbo has died because its not had a water feed? I know the main next thing is to get an oil pressure gauge to the car to see whats going on there so il get on ebay in a minute and buy one and go from there.

 

Sorry i dont know how to upload videos

 

restrictor is plenty big enough mate tbh its like not having one at that size, im not sure on how much oil should flow cranking but worth checking the oil pressure to be sure.
never rule anything out but i will be suprised if no water has killed it, stranger things have happened at sea though mate .....

at 250ml in 15 seconds that would make you 1 litre per minute that does sound kinda low to me especialy with a large bore fitting like you have.
id defo be checking the oil pressure now if not at the turbo feed at least of your block gallery, if you run of a filter relocator make sure you tap in after the filter not before as it will massivly raise the oil pressure reading otherwise.

 

http://www.turbobygarrett.com/turbob...er_Cooling.pdf

did you kill your old wet bearing turbo due to oil starvation if not it would not kill the ball bearing turbo as they use a lot less oil

this is the standard restrictor in the core

http://www.srtforums.com/forums/atta...cs-cagepin.jpg