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PostPosted: Fri Apr 14, 2017 1:04 pm 
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Greg,

I saw your posts on the FRS splitter, but would like some further qualification for the E46 M3:

On the E46 M3, the bumper has 4 "problems":
1. It is contoured with recessed (compared to the center) protrusions (compared to the overall curve of the bumper) on each side
2. It is curved at the bottom (not straight / 90deg angled)
3. There is a gap under the center
4. It is recessed from the actual "bumper" part of the bumper

So if the 4" rule is not measured via a plumb line from the bumper, how will it be measured?

Example picture (not mine):
Image

If you slide a ruler, it will slide under the center and it will slide back further under the sides by the fog lights.
So how does one measure this to be legal?


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PostPosted: Fri Apr 14, 2017 1:07 pm 
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Also for reference this is the Bimmerworld splitter:
Image


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PostPosted: Fri Apr 14, 2017 1:33 pm 
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In the other thread you posted:

Quote:
...Tape measure from the edge of the splitter to the intersection with the vehicle.

The problem here is that depending on the tape measure it can slide under parts of the bumper on the E46. This makes this measurement completely arbitrary. Plumb line would be easy and consistent.

Can we have the rules clarified and amended here?

Here's what I can find in the rules:

7.3.1 1)
Quote:
Front wing/spoiler/foil/splitter may not protrude more than 12
inches in front of the outermost edge of the front bodywork/fascia, and may not be
higher than the lowest part of the vehicle’s hood.

This clear and would support the "plumb line" theory.

7.3.2 D 2) C
Quote:
Single flat, horizontal front splitter that protrudes no greater than 4” from the vehicle.

This is not clear and not consistent to the "non-production" rule.


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PostPosted: Wed Apr 19, 2017 10:09 am 
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Run a few of these for various classes..looks as though they'd jut out too far in this case

Image


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PostPosted: Wed Apr 19, 2017 3:25 pm 
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That's a nice splitter.
Also further shows the problem with the "from vehicle" wording...
Where do you measure from now?


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PostPosted: Sun Apr 23, 2017 4:09 pm 
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Also, is this Bimmerworld riser legal?

Image


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PostPosted: Tue Apr 25, 2017 1:47 pm 
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int2str wrote:
Here's what I can find in the rules:

7.3.1 1)
Quote:
Front wing/spoiler/foil/splitter may not protrude more than 12
inches in front of the outermost edge of the front bodywork/fascia, and may not be
higher than the lowest part of the vehicle’s hood.

Regulations affecting bumper design in the late 1970s saw the increasing use of soft plastic materials on the front and rear of vehicles. Fascia was adopted then as the term to describe these soft areas, but is now increasingly used as a general term for a car's set of front-end components: grille, headlamps, front bumper, and other details. So, wouldn't the 12" be measured from the outer most part of the front bumper?


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PostPosted: Tue Apr 25, 2017 2:29 pm 
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int2str wrote:
Greg,

I saw your posts on the FRS splitter, but would like some further qualification for the E46 M3:

On the E46 M3, the bumper has 4 "problems":
1. It is contoured with recessed (compared to the center) protrusions (compared to the overall curve of the bumper) on each side
2. It is curved at the bottom (not straight / 90deg angled)
3. There is a gap under the center
4. It is recessed from the actual "bumper" part of the bumper

So if the 4" rule is not measured via a plumb line from the bumper, how will it be measured?

Example picture (not mine):
Image

If you slide a ruler, it will slide under the center and it will slide back further under the sides by the fog lights.
So how does one measure this to be legal?


How about take the ruler, and put it on edge (and if that isn't tall enough, assume the 2" height of a T square). The 4" would be measured from OEM fascia, closest to where the splitter protrudes from underneath it. We would not use a plumb bob from the top part of the bumper that overhangs the lower part of the fascia. It doesn't matter if the shape is not straight or has protrusions--4" maximum from any location (which may mean that if you want a smooth curve on the splitter that some points will only be 2" from the fascia protrusions).

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Greg Greenbaum
National TT, PT, & ST Director
Nat. Medical Director
greg@nasa-tt.com


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PostPosted: Tue Apr 25, 2017 2:31 pm 
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PSIxGEO wrote:
Run a few of these for various classes..looks as though they'd jut out too far in this case

Image

This piece does seem to follow the air dam rule, and if that center portion was 4" or less from the air dam, then it would be legal.
b)"Vertical front air dam (5º tolerance) that follows the outermost edge of the front and
side bodywork/fascia."

_________________
Greg Greenbaum
National TT, PT, & ST Director
Nat. Medical Director
greg@nasa-tt.com


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PostPosted: Tue Apr 25, 2017 2:32 pm 
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int2str wrote:
Also, is this Bimmerworld riser legal?

Image

This piece does not appear to be compliant with the air dam rule:
b) "Vertical front air dam (5º tolerance) that follows the outermost edge of the front and
side bodywork/fascia."

_________________
Greg Greenbaum
National TT, PT, & ST Director
Nat. Medical Director
greg@nasa-tt.com


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