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Old 08-16-2012, 01:43 PM   #1
taubr unit
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Default School me on my turbo specs

Ok there's a lot I turbo controversy goin on and I'm trying to follow but I don't know exactly what they mean. First off my turbo is a bullseye s480 t6 1.10 a/r. To me it's a 80mm turbo with a 1.10 a/r but everyone keeps talkin about turbine this and compressor that with 1xxmm numbers and F wheel this and G wheel that, 75/76 here and 96/110 there, inducer and exducer. So from my gathering the inducer is the smaller size of the wheel and exducer is the bigger end?, and is that the same for both compressor and turbine? I measured mine and correct me if Im wrong but here goes..

S480, t6, 1.10 a/r
Compressor- 80/116mm
Turbine- 74/84mm
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Old 08-16-2012, 02:25 PM   #2
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Default Re: School me on my turbo specs

On the compressor, the Inducer is the Inlet, minor diameter of the wheel. The Compressor Exducer is the major diameter, the part of the wheel inside the scroll that throws the air up against the housing.

The turbine side is the opposite, in that the turbine inducer is the major diameter of the wheel, exducer is the discharge or minor diameter.

For you it works out like this:

S400 frame turbo, T6 Turbine Inlet Flange with a 1.10A/R scroll casing.

Compressor Inducer - 80mm
Compressor Exducer - 116mm

Turbine Inducer - 84mm
Turbine Exducer - 74mm
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Old 08-16-2012, 03:10 PM   #3
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Default Re: School me on my turbo specs

Ok totally understand that now. Now what's the difference in trim wheels and why is the gt55 wheel so popular and what's the specs on it? Seems like everyone tells people to use that wheel in all the turbos so can I run that on mine?
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Old 08-16-2012, 03:16 PM   #4
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Default Re: School me on my turbo specs

The BW shelf units with the big turbine wheel have a 96/88 turbine wheel.

For a v8 most guys want the bigger turbine wheel to help reduce back pressure.

Last edited by hostile; 08-16-2012 at 03:17 PM.
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Old 08-16-2012, 03:30 PM   #5
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Default Re: School me on my turbo specs

You have a Borg Warner, the GT55 is referring to a Garrett Turbine Wheel/Shaft assembly

The GT55 wheel is popular for a multitude of reasons, one being for pure massflow on these bigger cube motors running 2 bar or more boost.

Bigger wheels and housings will require less drive pressure to make the same amount of power all things held equal, which makes the setup more efficient. This comes at the sacrifice of lag, but if you have a 305/350 or bigger with just a single T6 S480 I doubt you'll care much about lag unless you only wind out to 5k rpm.

I only have 122 CID, but I still use a divided inlet 16cm2 or ~1.21A/R "H2" proprietary Holset turbine inlet flange with an 84/70 turbine wheel.. Granted I will be winding out to just shy of 11k at 3 bar, so I am still moving a good bit of air.

"H2" flange is purported to be marginally larger than T4, according the the Holset Rep I talked to about a year ago and the gasket matching and bolt hole modifications I had to do to fit it to my manifold seem to back this up.
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Old 08-16-2012, 06:45 PM   #6
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Default Re: School me on my turbo specs

So how bad will my turbine side be on my stock 6.0 since everyone runs a bigger wheel? Then leads me to my next question.. how are people running 8's on a .96 turbine a/r?
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Old 08-16-2012, 07:13 PM   #7
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Default Re: School me on my turbo specs

If you have a stock 6.0 , you will never get to the power level of that turbo and have to worry about backpressure .

I have the same turbo with the 87/80 turbine and it makes just over 1000hp on my 383sbc . Sure its got 2:1 backpressure but so what . ...... lol

I think you will kill that 6.0 before you ever have to worry about BP .

That turbo should spool very well and make more than enough HP .

JMO .
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Old 08-16-2012, 07:39 PM   #8
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Default Re: School me on my turbo specs

Sounds good to me, lol. Eventually I'll build the 6.0 to either stock cubes or a 370 then boost as much as I can. But that's besides the point. Just tryin to learn turbo lingo and what the specific parts are and how they compare to one another.
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Old 08-16-2012, 11:29 PM   #9
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Default Re: School me on my turbo specs

I had that same turbo on a 355sbc a few years ago and it ran good. At 3200lbs it ran in the 5.90 range pretty regular and dipped into the .80's on occasion. Turbo was done at that point though, anymore boost and it would not speed up any. I put a S400-75mm with a big turbine wheel (96mm inducer) with a 1.32 a/r and it went .75 on the first pass out and eventually worked it down to low 5.60's.

The people running faster with a .96a/r turbine housing are on the GT47 style turbos most likely. The turbine wheel is a 92mm inducer on those. The a/r for the most part determines what rpm the turbo comes on (powerband), but the size of the turbine wheel dictates what the total flow for the turbine side is for the most part.
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Old 08-16-2012, 11:40 PM   #10
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Default Re: School me on my turbo specs

That deff shed some more light on turbo tech, thanks! Now what's the deal with g-trim, f-trim etc wheels? What's the diff?
FWIW, I'm shooting for solid 9.70's with my car n able to cruise aroun town to local cruise nights etc.
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Old 08-17-2012, 10:16 AM   #11
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Default Re: School me on my turbo specs

Trim is a ratio used to compare wheels.

Trim = [(Min2)/(Maj2)*100]

F-Trim and G-Trim Garrett Turbine wheels have the same ~5" major diameter (Inducer), but different Exducers (4.165" and 4.365" respectively)

So here's how that breaks down -

5.000 - 127mm
4.165 - 105.8mm
4.365 - 110.9mm

F-Trim:
Trim = [(Min2)/(Maj2)*100]
Trim = [(105.8^2)/(127^2)]
Trim = [(11193.64)/(16129)]
Trim = [~0.69]

G-Trim:
Trim = [(Min2)/(Maj2)*100]
Trim = [(110.9^2)/(127^2)]
Trim = [(12298.81)/(16129)]
Trim = [~.76]

F-Trim Turbine being smaller on the outlet side, spool quicker at the sacrifice of some mass-flow, when put in an apples to apples comparison. Same turbine housing A/R, Flange, Head, Cam, CID, etc.

Stock or Mild Cam on a 6.0 would have me leaning towards an F-Trim in a 1.0 A/R T6 were you using say a 101mm or a 98mm Turbo.

Bigger CID/Cam and more boost, or all of the above.. and I would be looking to use the extra 2 tenths of an inch the G-Trim turbine exducer has to offer.

Now when you talk about A/R, remember that you can't directly compare those numbers between turbos.. even in the same family.

Open T6 .96 A/R vs. Divided T6 .96 A/R with the same wheels on the same setup will have different flow rates and efficiencies at different PRs.
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Old 08-17-2012, 04:38 PM   #12
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Default Re: School me on my turbo specs

That size turbine wheel struggles to fully drive a 76mm compressor with out excessive back pressure. I would see if you could send the turbo back and get the 96mm wheel. I do believe the S480 1.32 ar T6 with 96mm turbine wheel is one of the cheapest units you can buy. The smaller turbine wheels add cost.
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