2007-2009 Peugeot 908 HDi FAP

Images copyright Peugeot Media and Michael J. Fuller
Text copyright Michael J. Fuller

Sebring 2008The turbo inlet duct serves dual function.  A vertical splitter divides the asymmetrical inlet area up in roughly halves with one side feeding the turbo (outboard inlet area), the other the rear brakes.
Peugeot 908, Petit Le Mans 2008For the 2008 Le Mans Test Days the 908 appeared with a revised turbo inlet.  In order to increase the height of the inlet, which is regulated to no more than 200 mm above the surrounding surfaces (Art 3.4.5 c/), Peugeot locally increased the height of the bodywork below the intake through a surface undulation.  This surface offset allowed the inlet to be raised by the amount of the offset even though the intake itself was still no more than 200 mm above that surface.  The inlet area is now symmetrical and there have been suggestions that the increase in height has been designed so that the inlet works in conjunction with vortices shed off the side mirror though this would seem to inject low pressure air into an area where you are desiring a ram effect and high pressure. Peugeot 908, Petit Le Mans 2008
2007 Peugeot 908 debutHere's a comparison between the debut tail (here, and reversed for comparison's sake) with the Le Mans '08 update (below).
Le Mans Test Days 2008We can see that the rear fender shape is more blunt making the engine inlet seem much more "remote" visually.  The trailing edge of the tail also has a more agressive kick up and the rear wing endplates are larger. 
Sebring 2008The diesel engine's water cooler exhausts out a louvered panel in the forward vertical face of the side pod.
Sebring 2008The center section of the cockpit's trailing edge is pinched inward in order to improve airflow to the rear wing.
Sebring 2008The 908's rear wing is an extruded section which doesn't change across its span. 
Peugeot 908, Sebring 2009Compared to the '08 wing, the '09 wing clearly is being run at a higher angle of attack (compare the mainplanes).  This in an attempt to claw back downforce from the reduction in span (1.6 M vs. 2.0 M) and chord (250 mm from 300 mm).

We understand that top mounted "swan neck" wing mounts (1, 2) were evaluated (to what extent, CFD or full scale testing we don't know) but rejected given the time and costs associated for the gain.
Sebring 2008The trailing edge body gurney is of varying height.  At Le Mans in 2007 the body gurney was changed out a number of times during the race weekend  as the team fine tuned the car setup.  The team made the changes rapidly by changing the entire tail sections that had the new gurney already fitted.  Peugeot continues this trend as noted at Petit Le Mans 2008 (see below).
Petit Le Mans 2008
Petit Le Mans 2008
Petit Le Mans 2008
Petit Le Mans 2008The 908's rear diffuser strakes no longer terminate at the trailing edge of the diffuser.  Instead the Peugeot's strakes end ahead of the diffuser's trailing edge in addition to having a notch cut into them.
Peugeot 908, Sebring 2009The introduction in 2009 of the narrow span and short chord rear wing saw an increase in the height of the tail gurneys.
Peugeot 908, Sebring 2009An additional gurney tab was added outboard on the rear fender.

ęCopyright 2009, Michael J. Fuller