Oil Restrictors For Turbos On Gtr?

[R32 TT]

Hi all,

Am fitting some Garrett 2560r to replace the stock turbos on my R32 GTR.

A couple of people have mentioned fitting some sort of oil restrictor on the oil lines to the turbos to reduce the flow of oil to them (and increase it in the motor?)

I would have thought that the lines on the turbos/GTR would already have this sorted... and I am concerned about what to do here.. I especially do not want to 'under' supply oil to the turbos of course..

Can anyone give me the low-down on why/how this is done? Or should it be left well alone?

[Beer Baron]

i'm pretty sure nearly all modern ball bearing garretts have the restrictor built into the centre cartridge.

[Sydneykid]

Why is it necessary, because standard turbos are plain bearing and the Garrett 2560R's are ball bearing. Plain bearing turbos rely on the oil for lubrication and pressure plus cooling. Ball bearing turbos only use the oil for lubrication. So they need reduced flow and pressure. Usually Garrett turbos come with flow restrictors standard. Check yours before you start trying to buy them, as they may already have them.

cheers

[R32 TT]

Why is it necessary, because standard turbos are plain bearing and the Garrett 2560R's are ball bearing.  Plain bearing turbos rely on the oil for lubrication and pressure plus cooling.  Ball bearing turbos only use the oil for lubrication.  So they need reduced flow and pressure.  Usually Garrett turbos come with flow restrictors standard.  Check yours before you start trying to buy them, as they may already have them.

cheers

<{POST_SNAPBACK}>

I hate to appear stupid... (but I am so ~good~ at it )

How would I check for this and what am I looking for? ie I don't know what the 'standard size' should look like, so I'm not sure if I look at it whether I will know if it has a restrictor fitted or not...

Has anyone got a pic by chance?

[R32 TT]

Why is it necessary, because standard turbos are plain bearing and the Garrett 2560R's are ball bearing.  Plain bearing turbos rely on the oil for lubrication and pressure plus cooling.  Ball bearing turbos only use the oil for lubrication.  So they need reduced flow and pressure.  Usually Garrett turbos come with flow restrictors standard.  Check yours before you start trying to buy them, as they may already have them.

cheers

<{POST_SNAPBACK}>

Better still! I just remembered I took some photos. Do either of these show what we are looking for?

http://dsl-202-72-159-143.wa.westnet.com.a...4%20(Large).jpg

or close up:

http://dsl-202-72-159-143.wa.westnet.com.a...3%20(Large).jpg

Cheers!

[V8 ETA]

hi i have fitted a few different garret turbo's to rb 26 and most of them will need a restrictor , rb 26 engines have one of the most high oil pressures out of everything i have had instances where engines have been making 50 psi oil pressure at idle , this is to much for a ball bearing turbo turbo at idling speeds and will push oil past the seals and cause it to blow blue smoke at idle ,you need to be using between .9 and 1.1 mm restrictor it does not have to be built into the turbo it can be anywhere in the supply line this will drop your idling pressure to around 10 - 14 psi the oil pressure will increase as the engines revs increase , it would pay to put a oil pressure gauge after the restrictor so you can keep an eye on it

[Beer Baron]

as far as i know (and please don't take this as gospel) the restrictor for those garretts should be .8mm or .9mm. and i am 90% sure it's built in and does not require an external restrictor in the feed line. if in doubt ring the turbo supplier and ask them. better to be safe!

[R32 TT]

as far as i know (and please don't take this as gospel) the restrictor for those garretts should be .8mm or .9mm. and i am 90% sure it's built in and does not require an external restrictor in the feed line. if in doubt ring the turbo supplier and ask them. better to be safe!

<{POST_SNAPBACK}>

Cheers - I think I'll follow that advice and give them a ring..

do the pictures in the link I posted above show you at all? (ie is this the part I am supposed to be looking at?)

I would have thought that as they are a specific turbo to GTR's then they should already have the correct one fitted?

[SteveL]

http://dsl-202-72-159-143.wa.westnet.com.a...3%20(Large).jpg

<{POST_SNAPBACK}>

In that photo, the number '14411-AA403' is the part number for an R34 GTR V-spec II turbo.

Generally 'genuine' Garrett turbo's have the correct restrictor built into the cartridge (centre) as suggested, but Nissan OEM turbo's usually have the restrictor as part of the banjo bolts in the oil feed lines.

[R32 TT]

In that photo, the number '14411-AA403' is the part number for an R34 GTR V-spec II turbo.

Generally 'genuine' Garrett turbo's have the correct restrictor built into the cartridge (centre) as suggested, but Nissan OEM turbo's usually have the restrictor as part of the banjo bolts in the oil feed lines.

<{POST_SNAPBACK}>

Hmm.. well that is interesting. The 707160-7 has more or less the same specs as the HKS GT-SS turbos. So do you think the R34 VSpec II has the equiv of GT-SS turbos? Possible I suppose?

I just hope they go well... are these the equiv to N1's? (or are all these the same even??)

[R31Nismoid]

as far as i know (and please don't take this as gospel) the restrictor for those garretts should be .8mm or .

correct, garrett BB turbos (from what ive seen) all carry an internal restrictor on the actual cartridge.

There is absolutely no need to ass one into the lines externally at any point.

I never ran an external one on my GT30, just used the internal one that was on the turbo itself... no issues

[SteveL]

So do you think the R34 VSpec II has the equiv of GT-SS turbos?  Possible I suppose?

I just hope they go well...  are these the equiv to N1's? (or are all these the same even??)

<{POST_SNAPBACK}>

I think GT-SS is good for something like 300+ps, which I think would be closer to the N1's, but I don't claim to be an expert on these.

[discopotato03]

That cone shaped gadget is the top of a tubular device that locates in a hole through the bearing cartridge and I'm told doubles as the oil flow regulator or restrictor . Those who removed it found out the hard way what happens when the bearing cartridge shunts backwards and forwards letting the wheels get close up and personal with their housings .

My personal experience is buy turbo , fit inverted flare adapter and plumb as for any other turbo .

There used to be some pictures floating around the net of a sectioned BB turbo and you can see this hollow mushroom headed locating pin type thing in it .

Cheers A .

[pnblight]

Hi all,

Am fitting some Garrett 2560r to replace the stock turbos on my R32 GTR.

A couple of people have mentioned fitting some sort of oil restrictor on the oil lines to the turbos to reduce the flow of oil to them (and increase it in the motor?)

I would have thought that the lines on the turbos/GTR would already have this sorted...  and I am concerned about what to do here..  I especially do not want to 'under' supply oil to the turbos of course..

Can anyone give me the low-down on why/how this is done? Or should it be left well alone?   

<{POST_SNAPBACK}>

r32tt the best thing for you to do is go to turbotec and order to 0.8mm oil resistors for the gt2560r and they will fit them for you the resistors are $40 each and worth every dollar. Tell them pete for bunbury sent you shouldn't be a problem.

the reason for the resistor change is the garret ball bearing turbo is only good for 60psi oil pressure and like sk said the ball bearing turbo doesn't require the quality of oil the std turbo do. the result of this is the turbo when motor is cool (high oil pressure) and is starting to get into boost and a few revs can pass a bit of oil and resulting white smoke so i use to have to be very carefull to full warm the motor up, since i have had the resistors fitted after talking to garret australia and turbotec the problem has been solved and i have three cars running the resistors now.

pete

ps hope it helps

[pnblight]

the garret turbo gt2560 comes with 1.2mm resistor in the 707160-5 i would think the -7 would be the same

can i ask why you picked the -7 over the -5

[R32 TT]

the garret turbo gt2560 comes with 1.2mm resistor in the 707160-5 i would think the -7 would be the same

can i ask why you picked the -7 over the -5

<{POST_SNAPBACK}>

Cheers for that Pete,

Hmm. Ian from Turbotech was in the workshop just yesterday and said there was no need to add restrictors - that the Turbo already had sufficient ones. But he made no mention of whether they were 0.8mm, or 1.2mm. Just said not to worry. Who were you talking to at Turbotech - do you know?

I ended up going for the -7 in the end because it more or less matches the specs on the HKS GT-SS, and from what I have read they seem to come on a fair bit earlier than the HKS2530 (or -5 equiv).. I understand they won't make quite the same top end, but its street response and circuit racing I am interested in - not drags or dyno. Unfortunately I haven't been able to 'try' each one - so I had to make a best guess based on all the reading and advice.

Hopefully I've made the right choice for my application.. will see soon eh!

[pnblight]

Service Manager Small Turbo's : Geoff Haley

is the guy to talk to and i would replace the 1.2mm with 0.8mm as it was recommend by garret australia after i had the problems i did and geoff flow test the results on the test bench.

[Scooby]

r32tt the best thing for you to do is go to turbotec and order to 0.8mm oil resistors for the gt2560r and they will fit them for you the resistors are $40 each and worth every dollar. Tell them pete for bunbury sent you shouldn't be a problem.

the reason for the resistor change is the garret ball bearing turbo is only good for 60psi oil pressure and like sk said the ball bearing turbo doesn't require the quality of oil the std turbo do. the result of this is the turbo when motor is cool (high oil pressure) and is starting to get into boost and a few revs can pass a bit of oil and resulting white smoke so i use to have to be very carefull to full warm the motor up, since i have had the resistors fitted after talking to garret australia and turbotec the problem has been solved and i have three cars running the resistors now.

pete

ps hope it helps

<{POST_SNAPBACK}>

Pete am I reading this correctly ie you run two restrictors?

[R32 TT]

Service Manager Small Turbo's : Geoff Haley

is the guy to talk to and i would replace the 1.2mm with 0.8mm as it was recommend by garret australia after i had the problems i did and geoff flow test the results on the test bench.

<{POST_SNAPBACK}>

Since the turbos are bolted in - and it may be hard to get to now - is it ok to put a 0.8mm restrictor inline somewhere else? I assume a 0.8mm that then goes to a 1.2mm will still be the equiv of replacing the 1.2mm will it? (or will they kind of sum and result in lower pressure still?)

What's the damage likely if I "try it" with just the 1.2mm.. ie is it ok to try and then fit a 0.8mm inline if I have the symptoms? Or have I 'stuffed it' if they get too much pressure?

[pnblight]

Pete am I reading this correctly ie you run two restrictors?

<{POST_SNAPBACK}>

one in each turbo you replace the std 1.2mm with a 0.8mm as well the restrictor serves as the location pin for the bearing cluster .

Since the turbos are bolted in - and it may be hard to get to now - is it ok to put a 0.8mm restrictor inline somewhere else?  I assume a 0.8mm that then goes to a 1.2mm will still be the equiv of replacing the 1.2mm will it?  (or will they kind of sum and result in lower pressure still?)

What's the damage likely if I "try it" with just the 1.2mm..  ie is it ok to try and then fit a 0.8mm inline if I have the symptoms?  Or have I 'stuffed it' if they get too much pressure?

<{POST_SNAPBACK}>

if there to hard to replace know you are most likely best to leave as is, as mine run for two year before i had an issue BUT you must be very carefull not to get on the gas while the motor is still cold as the pressure will bypass the seals and premature age the seals, i only had mine fail after leaving my car in the care of my brother while i was off shore not only did it have panel damage wheni got back but the seal begain to fail I believe from my brother thrashing when cold ,plus just to top it off the rings in 5 and 6 started to pass and that is why i had to bring my rebuild forward 6 months, needless to say i nearly strangled him when i got back, f**king idolt.