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SIZING A TURBO FOR A 4.0L

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How does one size a turbo ,like is there a common language like most of us no that a common supercharger is a 6/71 size but what about turbo's,i see stuff like garrett 35/40 does that mean that one side has 35 fins and the other 40 ? 

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BA BF XR6 turbos run a GT3582R & FG XR's run a GT3576R but depends on what power your chasing,

saw a turbo terri at a dyno day last weekend running a GTX42 making 460AWKW,

& my mates turbo territory makes 233AWKW with basic upgrades, 42lb injectors, exhaust, fuel pump, F6 air box, tune.

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Google and have a read of turbotech 101, 102, 103 if you want the specifics on how to size turbo correctly.

 

 

 

 

Sent from my SM-G928I using Tapatalk

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If I were you I would try and get my hands on a ba-bf turbo or a fg turbo they can be picked up pretty cheap and the come on fast and more than capable of 300 rwkw

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do you mean just the turbo or the whole engine ? i still havent decided to keep my ED 4.0L or the barra engine,has anyone seen that turbo exhaust adaptor on e bay thats selling,it fits up to your std exhaust manifold some how.

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Gt3582r is

How does one size a turbo ,like is there a common language like most of us no that a common supercharger is a 6/71 size but what about turbo's,i see stuff like garrett 35/40 does that mean that one side has 35 fins and the other 40 ?

 

A gt3582r has a gt35 turbine wheel which has no reference to actual size as far as I know, just a model name but the 82 refers to the exducer ( largest diameter) of the compressor wheel which is 82mm ( inducer around 61mm), the Garrett gt3576 on the FG xr6t has the same turbine wheel with a smaller exducer of 76mm. The Garrett GT4202 uses a GT42 turbine wheel with a compressor wheel exducer of 102mm, so you can kind of understand the frame sizes that Garrett uses. As far as turbo sizing goes, why not copy Ford ? : A GT3582R with a 1.06 ar turbine housing, capable d delivering 400rwkw with minimal lag on a 4L. Generally turbo manufacturers supply turbos with well matched turbine and compressor wheel with a recommended engine size range to work with. Volumetric and other efficiencies come into play when selecting a turbo. But generally, go for a turbo with a compressor map within the desired pressure ratio.

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Yeah " Spoolinboost " in Adelaide make the cast J pipe look them up on facebook

they have a FG with 570k km E gas engine with valve springs & there parts, did 11.7/121mph at aff drag nats on 10psi

 

That's an awesome looking kit!

I wonder if it will fit in an xg? Judging by how the turbo sits I'm thinking it might foul on the shock tower.

 

 

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i read somewhere that the ba-bf garrett was quite big for its application,and the new one for the fg spools up quicker and is a smaller turbo

The FG still uses a GT35 frame turbo, they just have a slightly smaller compressor wheel. BA-F use GT3582R, FG use GT3576R. The smaller compressor wheel probably partly explains why the FG Turbo models have better low down torque.

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Can't go wrong with a stock ba/bf turbo on a 4l. The fg f6 retained the bigger turbo, only the xr and g6et had the smaller one.

300rwkw is just scratching the surface power wise of a boosted 4l (single cam or barra the principal is the same), there is really no need to look any further than the stock bseries turbo at that level.

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Just leave it, that is pretty much perfect for boost. As long as you're running an intercooler, using decent fuel and it's tuned correctly

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