2009 Acura ARX-02a

 

Images copyright 
Michael J. Fuller

Text copyright Michael J. Fuller
Acura ARX-02a, Sebring WDWT 2009The wide front tires imparts a much bulkier look to the front end of the ARX-02a.  And they come with some draw backs; they are slower to reach operating temperature (such as on a restart), there is an increased possibility of hydroplaning in the wet, and there are negative interactions with the front diffuser.  Wirth Research ultimately felt these draw back were more than made up for by the gains.  And indeed WR claims to have overcome any and all drawbacks.   
Acura ARX-02a, WDWT 2009The 37/71-R18 Michelins.  It has been indicated that (for now at least) the tire compound for the front is the same as the rear.  
Acura ARX-02a, Sebring WDWT 2009Front dive planes were always a feature on the LMP2 Acura; never were they raced without some configuration of dive planes.  The ARX-02a's are similar in concept, but they seem much more hard wired into the the design and less a way of balancing the car.  I'll suggest there are potentially other methods of altering the car's front aero balance?  What leads me to that conclusion is that they are much thicker than the previous diveplanes as seen on the LMP2 cars which suggests a need to stay on the car.  That is, it would be detrimental to the car's performance if they were "pinged" off mid-race because of car to car contact.  The diveplanes are tapered on the outboard edge to improve aero performance.
Acura ARX-02a, Sebring WDWT 2009The Acura's bare nose with diveplanes missing reveals further proof of the permanence of the diveplanes.  We understand that the diveplane unit is glue bonded onto the fender, thus making them permanent
Acura ARX-02a, Sebring WDWT 2009The entire louver "cap" over the front wheel can be unbolted and replaced.
Acura ARX-02a, Sebring WDWT 2009At Sebring 2009 a partial blanked/louvered panel was used.

©Copyright 2009, Michael J. Fuller