34 replies to this topic

[JimmyJamJerusalem]

Ok so following on from the 'which oil' thread people mentioned how the oil pressure relief valve can help your turbo live out a long and healthy life

So I bought this one

http://cgi.ebay.co.u...e=STRK:MEWNX:IT

Seems easy enough. banjo fitting. Lovely, but where does it go? I've not poked my head under the bonnet today, but the location of a banjo on the turbo does not spring to mind...

Anyone got a piccy of where this goes..? Any more info on these would be nice as I am ready to fit. If anybody thinks I should not, speak now or forever hold your silence

[Vespa]

I've just ordered one myself. I haven't actually looked yet but the turbo should have 4 pipes going to the central journal. The pipes at 12 & 6 o'clock are the oil pipes and the ones at 9 & 3 o'clock are the water pipes. The one at 12 o'clock is the oil feed And it's this banjo that needs to be removed and replaced with the new restrictor valve. Apparently it's easier to do from underneath. It would be good to know how you get on as I won't be doing mine for another couple of weeks!

[Zoobeef]

Dont think you could do it from below. If you remove the intak pipe and upper heat shield then look dowm at the turbo from the top and you should see the bolt on the top between the impeller and turbine housing. I was thinging about this at the weekend, the max oil pressure would stay the same weather its a stndard car or not as the PRV in the oil pump determins the max oil pressure. So if vaux designed it at the pressure it is and cars have run all the time they have with no probs then why is it needed? Also why do Courteneys not off the bolt? Only Regal and think were agreed that there not the best. I may of course be wrong and someone may of put alot of research into this

[Nelly Vx]

Oil restrictor mod ............ Surely you would not want to restrict oil flow to your turbo Doesn't sound a good thing to me. I think it's probably best left alone

[cheeky_chops]

Oil restrictor mod ............ Surely you would not want to restrict oil flow to your turbo Doesn't sound a good thing to me. I think it's probably best left alone

Its not so much restricting the oil flow but reducing the pressure.

The issue is the zlet/h supplies oil at near 90psi - the restrictor reduces that to 40 psi which is more than ample. Infact it is the maximum suggested for a ball bearing garrett turbo. The high pressure can force the oil past the seals causing somking and oil leaks (hope i have it all right)

[Zoobeef]

Oil restrictor mod ............ Surely you would not want to restrict oil flow to your turbo Doesn't sound a good thing to me. I think it's probably best left alone

Its not so much restricting the oil flow but reducing the pressure.

The issue is the zlet/h supplies oil at near 90psi - the restrictor reduces that to 40 psi which is more than ample. Infact it is the maximum suggested for a ball bearing garrett turbo. The high pressure can force the oil past the seals causing somking and oil leaks (hope i have it all right)

Is that the same for the let/leh tubos that are oil bearings? If there was an issue with that pressure then wouldnt of vaux picked up on it? I know the standard banjo bolt is pretty small anyway so prob reduces the oil anyways

[Vespa]

Oil restrictor mod ............ Surely you would not want to restrict oil flow to your turbo Doesn't sound a good thing to me. I think it's probably best left alone

Its not so much restricting the oil flow but reducing the pressure.

The issue is the zlet/h supplies oil at near 90psi - the restrictor reduces that to 40 psi which is more than ample. Infact it is the maximum suggested for a ball bearing garrett turbo. The high pressure can force the oil past the seals causing somking and oil leaks (hope i have it all right)

Is that the same for the let/leh tubos that are oil bearings? If there was an issue with that pressure then wouldnt of vaux picked up on it? I know the standard banjo bolt is pretty small anyway so prob reduces the oil anyways

Well I've got a bit of smoking chimney action coming from my heat shield so having read the previous thread went out and bought one, hoping it will sort things out. I guess once the seals are weeping it's a one way road to ruin, but if this valve can prolong things then I'm happy

[theolodian]

Oil restrictor mod ............ Surely you would not want to restrict oil flow to your turbo Doesn't sound a good thing to me. I think it's probably best left alone

Its not so much restricting the oil flow but reducing the pressure.

The issue is the zlet/h supplies oil at near 90psi - the restrictor reduces that to 40 psi which is more than ample. Infact it is the maximum suggested for a ball bearing garrett turbo. The high pressure can force the oil past the seals causing somking and oil leaks (hope i have it all right)

There is a restrictor built into the turbo. The seals aren't under pressure anyway, unless you block the oil drain pipe. Now you are running 2 restrictors. No way of knowing how much oil it actually flows with 2 restrictors.

[theolodian]

Well I've got a bit of smoking chimney action coming from my heat shield so having read the previous thread went out and bought one, hoping it will sort things out. I guess once the seals are weeping it's a one way road to ruin, but if this valve can prolong things then I'm happy

External leaks have nothing to do with these seals. You have a leaky pipe fitting. This will probably sort it, because you fixed the leaky fitting.

[slindborg]

Its usually a problem when you fit a larger bore exhaust and the back pressure drops, meaning there is a greater pressure differential between the oil in the turbo and the exhaust pipe, meaning more strain on a fairly delicate seal. turbos dont need much in the way of oil pressure, more the flow is important to cool them (otherwise they would be grease lubed lol), And when running higher revs or thicker oil to cope with higher temps the std pump will give the turbo WAY more than it needs. Restricting the pressure down is a wise move for the real longevity of the turbo esp if being given a harder life than GM designed for

[Vespa]

Well I've got a bit of smoking chimney action coming from my heat shield so having read the previous thread went out and bought one, hoping it will sort things out. I guess once the seals are weeping it's a one way road to ruin, but if this valve can prolong things then I'm happy

External leaks have nothing to do with these seals. You have a leaky pipe fitting. This will probably sort it, because you fixed the leaky fitting.

ah ok, I see what you mean. I suppose the question is then 'has anyone on here actually fitted one before and did it make any difference'? Perhaps I'll just leave it in it's bubble wrapping for another day!

[CheesyPuff]

Have a look on the VXRonline forums and a lot of the Astra drivers have fitted them with no problems YET!!! I have one but not fitted yet either, My friend had a Noble and had a pair of similar restrictors fitted for the same reason (smoking turbo), they never caused any problems that I know of. Supposed to stop the risk of smoking frome the oil leaking past the bearing seals, more of a problem when a high flow exhaust is fitted as mentioned before. Darren....

[Vespa]

Have a look on the VXRonline forums and a lot of the Astra drivers have fitted them with no problems YET!!!
I have one but not fitted yet either, My friend had a Noble and had a pair of similar restrictors fitted for the same reason (smoking turbo), they never caused any problems that I know of.

Supposed to stop the risk of smoking frome the oil leaking past the bearing seals, more of a problem when a high flow exhaust is fitted as mentioned before.

Darren....

thanks darren! I'm gonna fit mine and if something goes wrong and the turbo dies, it will just be an excuse to buy a VXR jobbie

[siztenboots]

think i will wait until Jon Shield has done a write-up on this. The whole engine bay temperatures, coolant for block and charge, oil temps needs a fresh new look.

[CheesyPuff]

Whilst I can see the arguement for fitting one, Im still scared of fitting it lol. Lots of people have siad there fine, and have even stopped a smokey turbo, I would like to wait and see but someone will have to bite the bullett lol. Darren....

[slindborg]

think i will wait until Jon Shield has done a write-up on this. The whole engine bay temperatures, coolant for block and charge, oil temps needs a fresh new look.

just run with no rear clam

[siztenboots]

think i will wait until Jon Shield has done a write-up on this. The whole engine bay temperatures, coolant for block and charge, oil temps needs a fresh new look.

just run with no rear clam

I want to remove cambelt driven water pump and go with dual electric, fit smaller alternator on the opposite side of the block, and free up a sh** load of space around the intake for a ....

can you guess what it is yet?

[techieboy]

Ooooh, twin charged. Nice.

[slindborg]

think i will wait until Jon Shield has done a write-up on this. The whole engine bay temperatures, coolant for block and charge, oil temps needs a fresh new look.

just run with no rear clam

I want to remove cambelt driven water pump and go with dual electric, fit smaller alternator on the opposite side of the block, and free up a sh** load of space around the intake for a ....

can you guess what it is yet?

tasty.

Have they sorted the sh** reliability of using electric water pumps for the sole pump?
I know those craig david (or what ever lol) pumps dont temp to like being the sole engine coolant pumps for too long.

In the GM LSJ build book they mention an electric pump that seems 'ok' but its in the USA

Edited by slindborg, 15 April 2010 - 10:23 AM.

[siztenboots]

Ooooh, twin charged. Nice.

have a gold star