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Old 02-12-2020, 03:25 PM   #1
poulrais
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Default Turbo for T6 build

Hi there,

I'm about to drop the hammer on a turbo for my T6 build ( https://forums.turbobricks.com/showthread.php?t=340769 ). I was about to order a Borg & Warner S300 SX3 turbo (#177275) but I found this S400 SX4 (#171702) for sale for not much more money that the S300.

The S300 has an advertised power range of 320-800 hp and the S400 has a 500-1050 hp range.

I'm hoping for a 750-800 whp figure goal so the S300 will already be at its max hp range but I also want the car to be drive-able on the street and I fear that the SX400 will not be efficient at lower speeds/rpm.

Should I get the smaller one and modify it later if needed or go for the big S400?

Here are the turbo specs:

S300 SX3:

Compressor Wheel Inducer Diameter (mm): 66mm
Compressor Wheel Inducer Diameter (in): 2.6
Compressor Wheel Outer Diameter (in): 3.6
Turbine Wheel Outer Diameter (mm): 80mm
Turbine Wheel Outer Diameter (in): 3.14
Turbine Wheel Exducer (mm): 73mm
Turbine Wheel Exducer (in): 2.89
Turbine A/R: 0.91
Turbine Inlet Style: T4
Scroll Type: Twin

S400 SX4:

Bearing Housing Material: Cast Iron
Comp Wheel Inducer (in): 2.94 (75mm)
Comp Wheel OD (in): 3.94
HP Range: 500-1050
Turbine Config: VTF
Turbine Housing A/R: 1.32
Turbine Housing Inlet: T6
Turbine Wheel Exducer (in): 3.47 (88mm)
Turbine Wheel OD (in): 3.77 (96mm)
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Old 02-12-2020, 03:29 PM   #2
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Just found pics of an S400 installed on an LS build. That thing is HUGE!! I don't think it'll fit under the hood...
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Old 02-12-2020, 03:47 PM   #3
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88mm turbine wheel is a big one. Had a K31 with 71mm compressor, ~75mm turbine with a #18 exhaust when the engine had 800hp. It will take you to around 850hp(engine) and spool ok. Just to give a ball park what you might need.
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Old 02-12-2020, 03:59 PM   #4
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Out of curiosity, what is the goal of your car that you need 750hp?

HX40 super would be a nice turbo on a whiteblock 6.
Good response, huge torque and still does 600 whp.
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Old 02-12-2020, 04:13 PM   #5
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Quote:
Originally Posted by Sjeng View Post
Out of curiosity, what is the goal of your car that you need 750hp?

HX40 super would be a nice turbo on a whiteblock 6.
Good response, huge torque and still does 600 whp.
1/2 mile track just 45 minutes from my place... I want to put all these Deamon and Porsche owners to shame!

I will detune it for road course lapping events.
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Old 02-12-2020, 04:15 PM   #6
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Take a look at the efr stuff. You might be surprised at how much low you get out of a giant efr.
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Old 02-12-2020, 04:19 PM   #7
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Quote:
Originally Posted by cwdodson88 View Post
Take a look at the efr stuff. You might be surprised at how much low you get out of a giant efr.
like 4 time the cost of the S300 SX3 for the EFR models.

I just talked to RogerDee and he's running an A/R 1.32 B&W in his 940 LS powered car. That thing is definitely too big to fit under the hood with a top mount setup.
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Old 02-13-2020, 01:21 PM   #8
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EFR 9274 with a 1.01 housing seems to fit into what you want. You could choke it off a bit with a .92 internally gated housing as well...
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Old 02-13-2020, 01:27 PM   #9
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Quote:
Originally Posted by RvolvoR View Post
EFR 9274 with a 1.01 housing seems to fit into what you want. You could choke it off a bit with a .92 internally gated housing as well...
They're well over $2K!
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Old 02-13-2020, 01:33 PM   #10
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And I am pretty sure the S400sx will either be super lazy with a big enough hotside to make it useful or will be over the surge line with a small enough housing to make it decent to drive. The s300 seems like it will also be topped out at the power level you want to make. A bit of a trade off one way or the other.
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Old 02-13-2020, 01:33 PM   #11
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Quote:
Originally Posted by poulrais View Post
They're well over $2K!
Well, you're spending the money to do everything else to the motor and the car...why are you going to skimp on the turbo?
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Old 02-13-2020, 03:26 PM   #12
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Quote:
Originally Posted by RvolvoR View Post
Well, you're spending the money to do everything else to the motor and the car...why are you going to skimp on the turbo?
Cause I'm buying with CAD Mickey Mouse money and an EFR 9180 turbo good for 600-1000 hp is $3K CAD which is almost 4 times the price of the S300 SX3. I already have my wastegates and boost controller.
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Old 02-17-2020, 02:22 AM   #13
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I don't recall what the displacement of the whiteblock 6 is, but I would hazard a guess that an S400 T-6 flanged 1.32 hot side is not a good choice. Not a bad choice of turbo if you were doing an LS 5.3 or 6.0 swap. Why not go with something like an HX52?

I know Linuxman51 has used them on a couple of setups; one on his 2.5L 16vT and if I recall correctly it made ~750whp before the block went Tango Uniform skull dragging a TT Viper from a roll, and i believe untill recently on his LS swapped 940 tow slut wagon that makes ~760whp.
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Old 02-17-2020, 10:23 AM   #14
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Quote:
Originally Posted by Turbo3er View Post
I don't recall what the displacement of the whiteblock 6 is, but I would hazard a guess that an S400 T-6 flanged 1.32 hot side is not a good choice. Not a bad choice of turbo if you were doing an LS 5.3 or 6.0 swap. Why not go with something like an HX52?

I know Linuxman51 has used them on a couple of setups; one on his 2.5L 16vT and if I recall correctly it made ~750whp before the block went Tango Uniform skull dragging a TT Viper from a roll, and i believe untill recently on his LS swapped 940 tow slut wagon that makes ~760whp.
It's a 2.8L... I'm gonna go with the S300 SX3 A/R .91 and if I run out off efficiency I can always modify it later.
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Old 02-18-2020, 04:30 PM   #15
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Well it looks like it's going to be the SXE variant of the S300 turbo after all. Good for 1000 hp with the A/R .91 turbine housing.

Better turbine and compressor wheels, better compressor housing and better bearings. It's about $500 CAD more than the SX3 but I think it's worth it.
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