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Largest Frame Turbo On Stock Manifold- R33 Gts-t

Yeedogga

By Yeedogga,
in Engines & Forced Induction

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Yeedogga Experienced

Yeedogga

Posted
Posted (edited)

I have had a search but not uncovered any hard information;

What is the largest frame turbocharger that will fit on the standard RB25 manifold and not hit the strut tower/ frame rail?

I know people have fitted a GT3076 with a 10mm spacer and there is clearance, but how about GT35 etc.

I appreciate that most people wont run the std manifold on large-frame turbos as the stock unit becomes restrictive, but any info would be great

Cheers

* EDIT: I probably should clarify so I dont sound like an idiot-

I have a Holset HX35 (trying to keep it under wraps until I have it all together) and Im trying to work out (without test fitting- lazy) how much room, if any, I am going to have.

From what I can gather, the HX35 comp housing is bigger than a GT30 size, and Im a little worried about it.

All of the other Holset applications I have seen have been in R32's/ RB30s or on high mount manifolds.

Cheers

Edited by Yeedogga
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

GT35 is the same size as a GT30 in terms of frame.

I think a few people have tested the stock manifold useless after about 300rwkw though, which isn't even near GT35 territory anyway so no real point in many ways.

discopotato03 Grand Master

discopotato03

Posted
Posted

There are a couple of options but as Nismoid said pointless if the manifold can't pass enough exhaust gas to make it worth the while .

Two that spring to mind are the T04Z with a T3 flanged T4 turbine housing or a T3 flanged version of the GT37xxR turbos Garrett sell to the "deesel ute mate /aircraft carriers in the US market - think GMC/ Dodge Cummins Ram/Ford F111 .

Both the T04Z and the GT37 BB turbos are the larger BB "frame" or shaft/center section units . Probably need at least a HKS cast low mount manifold to even start to flow well enough .

A .

  • 9 months later...
Yeedogga Experienced

Yeedogga

Posted
  • Author
Posted

Resurrecting this thread- I bolted the turbo to a manifold on the weekend to see how much spacing out it would require...

It just looks far too big to fit down in the stock location... Does anyone know the diameter of a GT30 comp housing??

What you think, will it blend? (sorry, fit...)

post-55684-1283753306_thumb.jpg

post-55684-1283753325_thumb.jpg

hypergear Grand Master

hypergear

Posted
Posted

Any thing fits a .70 comp and 1.0 turbine with a 12mm spacer will do the job. But fitting up an internal wastegate and setup its bracket to operate without hitting any thing is very difficult.

  • 2 months later...
daniel23a Contributor

daniel23a

Posted
Posted

any luck with this? i am looking to do the same, which means plans have been on hold till i find out if it fits. have you tried positioning it in the engine bay yet? what kind of clearances are you getting (if any?). any guidance would be much appreciated. cheers, Daniel

zebra Grand Master

zebra

Posted
Posted
Any thing fits a .70 comp and 1.0 turbine with a 12mm spacer will do the job. But fitting up an internal wastegate and setup its bracket to operate without hitting any thing is very difficult.

So a .7 ar GT60 comp housings will fit?

I dont think so

GTScotT Grand Master

GTScotT

Posted
Posted
So a .7 ar GT60 comp housings will fit?

I dont think so

LOL @ above. Le sigh, strippey horse I know your pain.

GT3582R .70AR = Centre of turbo to centre of outlet = 76.2mm

GTX4202R .60AR = Centre of turbo to centre of outlet = 108mm

AR = Aspect Ratio, not fking cm2

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

but .7 is bigger than .6 :blink:

as already said its pointless running anything bigger than a gt3076 on a standard manifold as it becomes a massive restriction above ~280rwkw

  • 2 years later...

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