34 replies to this topic

[techieboy]

Will the VXT gearbox be up to that kind of torque? I know Ronin (the mental American Exige fiddler) kept lunching gearboxes.

[cheeky_chops]

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.

had mine replaced twice when under warranty. Plume of smoke out of the top of engine like a chimney when on coastdown! Been fine ever since


Back to the restrictor - i run a 3" zorst and never had any zorst related smoke, always run mobil1 10w40. Read lots about it on AOC/ZLET/VXR forums (percy on zlet forum was the original designed/seller of the restrictor in small numbers) but never assertained why some people have oil passing the seals and others dont...

[Winstar]

Where to start on this one. Firstly you if you reduce the pressure you WILL reduce the flow rate. Although as the rotation of the journal bearings helps makes up for some of the loss in pressure driven flow. The reason the seals leak is because they are not true seals, just an arangement of spilt rings in groove that create a high pressure drop. The reason they leak in some and not others is due to sh** tolerances on cheap pass car turbos, yes they charge us £500 but they cost more like £20 to make. Oh and I don't see why you'd bother to twincharge a VXT when all the components are already available to do it for a NA, plus you get an extra 0.2L to play with.

[theolodian]

Where to start on this one.

Firstly you if you reduce the pressure you WILL reduce the flow rate. Although as the rotation of the journal bearings helps makes up for some of the loss in pressure driven flow.

The reason the seals leak is because they are not true seals, just an arangement of spilt rings in groove that create a high pressure drop. The reason they leak in some and not others is due to sh** tolerances on cheap pass car turbos, yes they charge us £500 but they cost more like £20 to make.

Oh and I don't see why you'd bother to twincharge a VXT when all the components are already available to do it for a NA, plus you get an extra 0.2L to play with.

and

[siztenboots]

Oh and I don't see why you'd bother to twincharge a VXT when all the components are already available to do it for a NA, plus you get an extra 0.2L to play with.

Don't like the long stroke though, 86mm is best, give me a 2.0l LNF to play with

[Duncan VXR]

Had one of these over a year ago made up - seem to work but Winstar has covered it really. I killed a turbo but cannot say if it was the reduction in oil pressure to the turbo - not ran it since and car has not blown up yet but the AET turbo is put back together with better bits - the oe stuff really is made quite bad DG

[Nev]

I emailed the seller of these and asked what PSI it reduced the pressure to and at what revs etc. He had no idea.... not a particularily scientific answer...

[Duncan VXR]

Nev drops from 90ish psi to 60ish psi - from cold mine sees 100psi warm 90psi with the thing fitted it was 70psi cold 60psi warm. at 4k plus these figures dont really change. At lidel it drops but never under 40 if I remember correctly DG....source of useless info today

[Vespa]

Fitted mine today and the smoking that I used to get on idle seems to have dissappeared I think I will need to do a few more miles before I can conclusively say the problem is solved, but so far so good

[bbd]

Just a thought,have you checked that the turbo oil return pipe gasket is not weeping? I had that on mine,replaced the pipe(now a different design)and gasket,rarely get any smoke now.

[Vespa]

i havent checked the return pipe actually, but its something i can do when the car is up on the ramp this saturday having some mods done to the exhaust

[Tommess]

Fitted mine today and the smoking that I used to get on idle seems to have dissappeared I think I will need to do a few more miles before I can conclusively say the problem is solved, but so far so good

Are there any news to that issue? Is your turbo still working without smoking? I'm asking because I also want to fit this oil restrictor bolt.

Thanks!

[Vespa]

Fitted mine today and the smoking that I used to get on idle seems to have dissappeared I think I will need to do a few more miles before I can conclusively say the problem is solved, but so far so good

Are there any news to that issue? Is your turbo still working without smoking? I'm asking because I also want to fit this oil restrictor bolt.

Thanks!

The turbo still works as normal and the smoking has definitely stopped I have only done maybe 1000miles though so I wouldn't say it was 'conclusive' as such. To be honest a part of me is hoping the turbo will fail as it will force me to get a garret on their sooner

[Tommess]

That's good to hear! Thanks!

[JimmyJamJerusalem]

I've sold my VXR now and bever fitted this. For sale if anyone wants it...?