First time ever tuning a SX200, so figured it may be of benefit to share.
This turbos supposed to be inbetween a Red & Black to put its size into
perspective. Borg warner rates it at 580hp, and it seems like their ratings
are pretty spot on for the most part.

Mods on this car are:

Stock block
Borg warner SX200
GSC S3 cams
TSComptuned Double pumper
FIC 2150cc inj
3" TBE
Grimmspeed 3port
2.5" upper piping /w Tial Q BOV
Tephra v7 Speed density /w ecuboost

As seen from below the turbo is pretty responsive. I had to do a lot to keep the torque down so you see a very interesting boost curve.

 

Single scroll turbine housing?

 

seems like a crap ton of boost for mid 500's

 

Its a ~56mm inducer turbo so I don't think its too bad factoring that in. You need to compare this to a GT(X)30 for reference. Considering that 62mm turbos are also making mid 500's at 28 - 30 psi on stock blocks.

@Tom, would you know if this is the newer SX-E 10-blade billet version (S257 SX-E) or the older normal "S200" ?

 

How is the transient response on these ?

A.C compressor bracket still in place ?

 

it’s 35-36 psi for peak hp, not 28-30

 

Its an S257 SX-E from what I was told.

 

What size hotside?

 

I am not sure. This is about the max the turbo is capable of HP wise though on this vehicle.
Should be about a 133-134 trap.

 

Yes I was referencing what psi the larger 62mm turbos run to make similar numbers as a comparison.

What I will add is that BW rates that S257 SX-E at 65 lb/min but it doesn't appear like there is much room for more power on this setup. The S200 exhaust wheel is probably reaching its peak flow capability before the compressor wheel.

 

My personal Evo makes 530whp with only 25psi with a 5858, and 560whp with 27psi but it's an evo 10 so not a direct comparison, but now you know why I made the statement I made.

BTW, my comments are not about Tom's capabilities, I am just discussing the turbo.

 

All good, always good to debate points when discussing technical topics and get different frame of references. Good numbers on your 5858 setup.

Seems like BW is starting to follow the Garrett GTX marketing mould of pairing very high flowing compressor wheels with great advertised flow rates to existing turbine wheel configurations that reach their choke limit before the compressor wheel does.

I have a sense that the S369 SX-E will be a similar case

 

The S200SXE has the same turbine blade profile as the EFR 7670 and the compressor is rated at 65-68lb/min. I'm betting this result is a standard S200SX in a smallish T3 turbine housing. Also looks like a small intake, which never helps. Plenty of variables to consider before one assumes.

Also, more efficient compressor wheels actually reduce the work required from the turbine, so any way you slice it it's a win. Garrett has done some goofy things, don't get me wrong, but they have a few gems in the lineup.

 

Absolutely false information. EFR wheels have totally different blade angles and don't flow as well as the SX-E turbines. EFR wheels are cupped more for better response.

Nice results! would be nice to know the hotside configuration.

 

Can we get a definite answer on whether or not this is a S257SXE, and what size turbine housing?