BMW Pro 3

[dickita15]

Guys, I got a question from the west coast guys with the Runoffs being there in 2014 and the Majors growing. I guess there are a bunch of BMW Pro 3 cars out there. http://www.pro3-racing.com/


They want to know if they can run in STU. It look like to me that the cars are legal in ITS although they will need to weigh 100 pounds more. Legal ITS cars can run in STU.


Can those of you who know BMW’s and the STU rules better than me tell me if I am missing anything?

[Greg Amy]

Items that stick out to me:

- The battery may be moved from its stock location as long as it is not placed within the passenger compartment. The battery may be replaced with any 12-volt battery.

- Wire mesh screens with a minimum opening of 3/16” cont. may be fitted... (we're 1/4", right?)

- A BMW OEM or dimensionally equivalent steel flywheel must be used.

- Any stock transmission, including automatics, correct for the body series may be used....Shift linkage may be modified or replaced.

- Engine, transmission, and rear differential mounting material is unrestricted. Drive train mounts of alternate material and design may be used...

- Power steering components may be disabled or removed.

http://www.icscc.com/references/comp...3_complete.pdf

Starting page 71 (PDF p74).

[mossaidis]

Sounds like short of the auto tranny thing and the wire mesh, they might be legal for STU based on Greg's references.

[Greg Amy]

Sounds like short of the auto tranny thing and the wire mesh, they might be legal for STU based on Greg's references.

Good point. Engines are 2499cc, so STU weight would be 2750#, no additions for RWD. Pro3 weight is 2650, so 100# more ballast.

And there's no 1/4" mesh limit in STU (in fact, you're allowed to cover grill openings).

And I'm gonna go out on a limb and guess no one runs the automatic transmission.

So, other than +100#, they're compliant to STU.

- GA


Edit: oops, cage. STU requires a lateral dash brace. Pro3 regs require IT- or GT-compliant cages, and the former does not require a lateral dash brace.

[Chip42]

so GT cage + 100# = STU compliant
if IT cage then must conform to IT rules, then adjust to IT weight and it's STU compliant.

right?

[mossaidis]

ITS is okay if they also meet all the IT rules. Based on Greg's list comparing allowances above and beyond ITCS:

- the battery has not been moved or replaced with non-oem style battery.

- Wire mesh screens with a minimum opening 1/4"

- OEM flywheel is used

- Stock manual transmission is used with no shift linkage modifications

- Engine, transmission, and rear differential mounting material meet IT rules

- Power steering components are not disabled or removed

Did I miss anything?

[Greg Amy]

so GT cage + 100# = STU compliant
if IT cage then must conform to IT rules, then adjust to IT weight and it's STU compliant.

right?

Honestly don't know GT cage rules...do they require a lateral dash bar?

I'd just suggest these guys toss a crossbar and 100# in the car and call it "done".

- GA, laughing at Ed and Mickey...

[JS154]

Guys, I got a question from the west coast guys with the Runoffs being there in 2014 and the Majors growing. I guess there are a bunch of BMW Pro 3 cars out there. http://www.pro3-racing.com/


They want to know if they can run in STU. It look like to me that the cars are legal in ITS although they will need to weigh 100 pounds more. Legal ITS cars can run in STU.


Can those of you who know BMW’s and the STU rules better than me tell me if I am missing anything?

Dick, who did you talk to? I know a few of those guys out there, I'm happy to get involved and help make this work for them. STU at LS next year I think will need entries to crown a champion.

[dickita15]

Actually the director from out here Todd Butler said he was getting questions so I started this thread and sent him the link so they would have a resource.