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· Garage Queen Club
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I did, still working on it. 30F out, been a tough month to get her out and tune. I'll be updating my other post once the data rolls in and some real world track feedback, but crickets right now, sorry. I did choose the 63mm version and comparison will be against a 60mm unit. He's looking at 64~68 which is a few steps above.

My exact new unit to test is:
BorgWarner S363SX-E 8776 63mm turbo, Airwerks .91a/r divided 76mm turbine 78.5 lb/min flow, 3.5" marmon turbine exit

I haven't seen any info on SXR, barely anything on google searches nor forums nor vendors. This just get released?
 

· Garage Queen Club
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S258SXR chokes at 67lb/min at 2.6 ratio
S363SXE chokes at around 73lb/min at 2.6 ratio.

Their Matchbot software shows my engine pushing ~75lb/min at 8krpm 23lb boost. I couldn't run the 258SXR. I've run a SX360 for years and kept blowing up the turbo due to heat in road racing.

Probably want to compare apples:

S364SXR (they don't list a 63mm) at 2.6 ratio chokes at 83lb/min
S364SXE at 2.6 chokes at 78lb/min

That's a fairly nice bump in flow, but all the compressor/turbine dimensions are slightly different. I would be most interested in spool or boost threshold when choosing one for road course. They claim SXR

• Low rotor inertia (quicker spooling)
• Forged milled compressor wheel
• Optimized compressor stage aerodynamics

while SXE is

• Forged milled compressor wheel
• Optimized compressor stage aerodynamics

No mention of what they mean by low rotor inertia. They're using the same turbine wheels and turbine housings in both based on part numbers and dimensions. The compressor wheels and housings are different, and 'smaller' on the SXR.

Since they aren't available anywhere for purchase either. Unfortunately, 63mm is already too big for my goals, and SXR is either 58mm or 64mm. Hopefully someone gets one.
 

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~$2k vs ~$800
 
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