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Gcg Wheel Measuements?

benl1981

By benl1981,
in Engines & Forced Induction

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benl1981 Grand Master

benl1981

Posted
Posted

I have measured the comp housing on my 2nd GCG. It measures 54mm I.D. This means that it must be about a 52mm OD wheel. My other GCG must be around 54mm OD wheel (The one I am having surging issues with)

Anyone measured the comp wheel housing inner diameter.

Ans how about the exhaust housing. It seems to be bored out to around 57mm..on the 2nd GCG - the 1st one must be about 54mm

I.e.

1) Surging - Approx 54mm Comp wheel (About 56mm bore size) , 54mm exhaust wheel

2) Unknown - Approx 52mm Comp wheel (About 54mm bore size), 57mm exhaust wheel

Thanks

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benl1981 Grand Master

benl1981

Posted
  • Author
Posted

Im going to take both turbos to them and discuss. I have already been in contact with them..

I just wanted some dimensions from here if possible

The compressor wheel on 1 is too big - I will be reusing the one of the 2ndturbo. But the 2nd turbo has a chipped exhaust wheel and more play..

too many crap turbos here!

MANWHORE Grand Master

MANWHORE

Posted
Posted (edited)
Im going to take both turbos to them and discuss. I have already been in contact with them..

I just wanted some dimensions from here if possible

The compressor wheel on 1 is too big - I will be reusing the one of the 2ndturbo. But the 2nd turbo has a chipped exhaust wheel and more play..

too many crap turbos here!

I've found that in the past, gcg haven't been very helpful in regards to discussing turbo tech. It may be that they are being protective of the wheels that they use etc.

Really knowledgeable bloke to speak to on here would be Dale FZ1. He knows his turbos.

Edited by MANWHORE
BHDave Grand Master

BHDave

Posted
Posted

Just an interesting note.

My old s2 highflow looked to have the same comp as turbo 1 and the same exhaust side as turbo 2. BUT i remember my s2 highflow had a little groove cut into the inside of the snout right where the inducer tips sit (similar to stock). it was about 10mm wide and 1mm deep from memory (anti surge mod?). I'll see if i can dig out my old for sale thread photos and confirm. post-2863-1185400278_thumb.jpg

Dale FZ1 Veteran

Dale FZ1

Posted
Posted (edited)

Nothing is ever as simple as it seems.

You'd have to consider the size and specs of each impeller, and the size of the housings they are fitted to before trying a mix & match approach. Might work, might not. Might find a R34 / VG30 housing will help to keep that surge prone cartridge in a happy zone.

I have PM'd you Ben

cheers

Edited by Dale FZ1
MANWHORE Grand Master

MANWHORE

Posted
Posted
Nothing is ever as simple as it seems.

You'd have to consider the size and specs of each impeller, and the size of the housings they are fitted to before trying a mix & match approach. Might work, might not. Might find a R34 / VG30 housing will help to keep that surge prone cartridge in a happy zone.

I have PM'd you Ben

cheers

Dale, my thoughts exactly. My initial thought was to replace the rb25 exhaust housinng with a vg/gtt housing.

This is not an expensive thing to 'try' at all, since most engineering places/machine shops/turbo places with a lathe can machine the snout to whatever spec you want. That is in comparison to the price that gcg charge to repair/renew highflow turbos.

This should shift the power/airflow up a few hundred rpm (the op6 housing is significantly larger - 0.8ar as opposed to 0.6). The engine should be able to ingest the air at that rpm.

It's not really a waste even if it still surges, because it gives you the ability to make more power. I believe that if a turbo is to be upgraded, it shoudl be a worthwhile one :pirate:

MANWHORE Grand Master

MANWHORE

Posted
Posted
Just an interesting note.

My old s2 highflow looked to have the same comp as turbo 1 and the same exhaust side as turbo 2. BUT i remember my s2 highflow had a little groove cut into the inside of the snout right where the inducer tips sit (similar to stock). it was about 10mm wide and 1mm deep from memory (anti surge mod?). I'll see if i can dig out my old for sale thread photos and confirm. post-2863-1185400278_thumb.jpg

Its amazing that they managed to machine an anti reversion groove into the already significiantly machined housing. Where the groove is, there is almost no meat left.

On my slide turbo, you can squeeze the snout on the comp housing and it moves.

benl1981 Grand Master

benl1981

Posted
  • Author
Posted

Bhdave - that comp wheel looks almost like a stock one. See how they have machined it out but right near where the impeller is there is less material removed.

Did your turbo with the larger comp wheel surge?

Thanks for the lengthy PM dale. Will respond later. I have verniers so can measure it carefully

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