Fender flares and widebody cars

[shanehutton]

I am having a bit of confusion understanding the rules regarding a widebody car. My car's track is aprx 4-5 inches wider with new fenders to accommodate. I see a mention in the PIP section regarding wheels sticking past OE fenders but then it refers to a section that says you can only modify the inside of the fender. If my tires are outside of the theoretical stock fender do I just take the PIPs or am I facing a much more complicated issue?

[shanehutton]

Re: Fender flares and widebody cars

Read it again and it looks like it's just 2 PIP for the flares but they are allowed with the PIPs. Sorry for the waste of a post. That is unless I am blowing it and then feel free to correct me.

[racecartech]

Re: Fender flares and widebody cars

Shane, not to worry. I had to re-read it a couple of times too when I built my widebody.

you are correct it is 2 pips

[shanehutton]

Re: Fender flares and widebody cars

I had a little panic moment but I am good now. Phew.

[Slowpoke]

Re: Fender flares and widebody cars

You can roll the inner fender lip without taking PIP's as long as you don't change the outer profile of the fender. Extending the outer fender is 2sPIPs. Mind the aero constraint rules.

5.1.A3. AERODYNAMIC MODIFICATIONS
Aerodynamic modifications shall not extend more than 4" past the
forward most, rearward most, sides (excluding side mirrors), or highest
point of the OE vehicle body.

[racecartech]

Re: Fender flares and widebody cars

I stayed at 2"/side. Shane make sure you do not go wider than 4" overall

Thanks Steve

[shanehutton]

Re: Fender flares and widebody cars

Car was widebody before I got it and I have no idea of the exact width change on the fenders and it can't go back to stock. I am, however, quite sure that it is considerably less aerodynamic than it was stock and none of the added bodywork is providing downforce so would this rule even apply? I would assume that rule was intended for Splitters, dive planes and wings not big ugly boxed flares.

Here is a reference to what I am talking about. The car still runs 225 tires as well so it is more of a wider track thing than stuffing 275 tires under it. Also, thanks to some crash damage and a lazy repair the flare on the drivers side is wider than the pass side. Maybe that will help.

[racecartech]

Re: Fender flares and widebody cars

Shane,
That looks like the M3 widebody race car.

You are within the 2"/side with that. You also have room to increase the backspace leaving the outer wheel shel in the same location. 275 will easily fit under that car.

[shanehutton]

Re: Fender flares and widebody cars

It's a lot wider than a stock m3. 275 wouldn't even be tight. Can anyone confirm that the 2" rule only applies to aero devices and not regular bodywork?

[racecartech]

Re: Fender flares and widebody cars

It applies to all bodywork

[shanehutton]

Re: Fender flares and widebody cars

Seems odd that it applies to non aero modifications. I'll have to measure the car to confirm then. I assume I will be ok but if I am over 2" per side then where does that leave me?

[ScotcH]

Re: Fender flares and widebody cars

It applies to all bodywork

Where does it say that?

[Slowpoke]

Re: Fender flares and widebody cars

I'm waiting for input from my fellow CCC members, but hold off before you cut steel on the 2" rule.

[bsclywilly]

Re: Fender flares and widebody cars

The rule they're referring to is:

A3. AERODYNAMIC MODIFICATIONS
Aerodynamic modifications shall not extend more than 4" past the
forward most, rearward most, sides (excluding side mirrors), or highest
point of the OE vehicle body.

This means that aerodynamic modifications can extend 4" on each side. BUT if you read through section A3, aerodynamic modifications are defined as .1 airdams/splitters, .2 rear spoilers, .3 rear wing, and .4 underbody treatments.

You can run as wide of fender flares as you want for 2PIP. It has nothing to do with the aerodynamic modifications.

[racecartech]

Re: Fender flares and widebody cars

Thanks for the clarification.