GCG Question ??

[B-Man]

Hey all,

Who can tell me the technical difference between the 450HP hi flow and 500HP hi flow turbos that GCG offer ?? (and don't say 50 HP please)

I'm sure Sydneykid et al will know....

Is it that the 500HP job can handle more boost or does it flow better ? And if so , why ?

Thanks in advance.

[2rismo]

50h.....oh......

Adrian

[TTT]

I'm pretty sure that the difference in 50hp is from the compressor and exhaust wheel specs between the 2 turbo's.

The measurements I am not sure of.

[Hiroshima Screamer]

Originally posted by 2rismo

50h.....oh......

Adrian

damn that was my line ( wacka wacka )

[B-Man]

GCG Got back to me with this:

The wheel sizes within the turbocharger are larger on the stage 2

conversion. Compressor wheel is a H trim TO4, turbine wheel is a T34 79 trim.

I need an interpreter !!!

What does all this mean ???

How can I identify if I have a Stage I or Stage II ?

[Sydneykid]

Measure the exducer and inducer diameter, ring Mark and tell him the measurements, he will be able to tell you which it is.

[amosite]

79 trim is about 4000 Spool time.

Meaning you wont have useable boost until this threshold is met

Easiest way to decide is if you want 50 hp at top?

Or 50 hp lower down?

If it is a street car, run the 450 model.

Track car, 500 minimum!

[MRK25T]

Brendan, it looks like there is a piece of metal that has broken/chipped off in that first pic (the thing that looks like a washer in the middle of the photo).

I'm guessing my turbo is close to the 450hp CGC hi flow.

Mark

[B-Man]

No Mark - there is no piece broken on this turbo

[MRK25T]

Originally posted by B-Man

No Mark - there is no piece broken on this turbo

Why is it like that? I would have thought if it was meant to be like that the break would look straight and not jagged looking?

Mark

[Steve]

Mark, all turbos that I have seen are like that, I believe it may be part of the balancing process.

Quite often see little cut out bits on the back of the compressor wheels too, dont know about turbine wheel as I have never seen one close enough:)

[B-Man]

Steve is right - it's part of the balancing process.

Take your turbo off - you will find you have the same thing.

[MRK25T]

Originally posted by B-Man

Steve is right - it's part of the balancing process.

Take your turbo off - you will find you have the same thing.

I cant even get the heatshield off - it must have been tightened by someone stronger than me when they did the turbo and leaking gasket down there.

I was pointing it out just in case it could have been a problem.

Mark