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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Tracking / Racing / Autocrossing > What Autocross class for FBO N55?
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      05-18-2021, 11:35 PM   #1
Kpd7720
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What Autocross class for FBO N55?

SCCA Solo classing always gets me. Would STX be the right class for my setup?

2014 RWD 335i
FBO
JB4
E30 Mix

No other mods. Eagle Sport A/S 245/45R18 on stock Style 397s

Yes, I know I will be slow.
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      05-19-2021, 04:53 AM   #2
indyjoeshmo
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I have the same setup and ran STU last weekend.
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      05-19-2021, 12:39 PM   #3
nickf30
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245 tire on STX. wider than 245 tire STU
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      05-19-2021, 02:57 PM   #4
brigade24
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Quote:
Originally Posted by Kpd7720 View Post
SCCA Solo classing always gets me. Would STX be the right class for my setup?

2014 RWD 335i
FBO
JB4
E30 Mix

No other mods. Eagle Sport A/S 245/45R18 on stock Style 397s

Yes, I know I will be slow.
If you're version of fbo includes the turbo then your car does not meet the STU requirements...you would probably be in XSA or XSB which would allow for the turbo.
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      05-25-2021, 03:27 PM   #5
ClevelandBeemer
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Quote:
Originally Posted by Kpd7720 View Post
SCCA Solo classing always gets me. Would STX be the right class for my setup?

2014 RWD 335i
FBO
JB4
E30 Mix

No other mods. Eagle Sport A/S 245/45R18 on stock Style 397s

Yes, I know I will be slow.
If you are FBO you should not be in STX. You also cant run more than 15% ethanol in any street or street touring class. E30 puts you in ASP, also Meth injection is banned from all classes. If you are catless and have an upgraded intercooler then you should be in ASP. In STX you must have a >100 cell cat and you can't modify anything from the turbo inlet on. Also anything other than the stock turbo would disqualify you from any street or street touring class.

Hopefully you're still on the stock turbo or else you will be in XP. Is it the end of the world? No, but you'll never be competitive in the PAX.

So to summarize you should be in ASP. All of your engine mods, except a turbo upgrade, are legal as well as your fuel and tires. For reference, all of this info came straight from the SCCA rulebook 2020 edition.
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      06-01-2021, 12:58 PM   #6
BMW in NE
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Quote:
Originally Posted by ClevelandBeemer View Post


Hopefully you're still on the stock turbo or else you will be in XP. Is it the end of the world? No, but you'll never be competitive in the PAX.
+1 on never being competitive in the PAX. However, go out there and have a good time. Just compete with your own times for now.
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