The
proximity of the wing to the tunnel exits is evident here, and a drastic
change over the standard factory 962 bodywork.
The
height of the standard 962 tunnels was barely above the drive
shaft.
Here you can see that there is quite a lot of clearance, giving a
better idea
of how different the Busby car's tunnels were.
Busby
would also run a water cooled 962C, side by side with the single turbo
air-cooled car, during the 1989
season. The water cooled car (here) is identified by the lack of
large inlet ducting on the engine cover. Porsche delivered the
962C (962-009), still in its Porsche Supercup Shell livery, at the Lime Rock race
weekend. The team tested the car back to back against their single turbo,
air cooled car on the Monday following the race, with Bob Wolleck
doing
all the driving, and
acting
as the control. Colucci indicates the 962C
was
much
slower (Busby says up to 1 second slower, an eternity at a place like Lime Rock): it was still fitted
with
a spool differential and, “Understeered like a pig.” Given
its
recent delivery there
hadn't
been any time to fit the Busby mods to the water cooled car so it
tested as stock from the factory. 
Later
in the season the team would upgrade 962-009 to "Busby" aero spec, minus the underfloor update;
the twin-turbo layout of the 962C was simply in the way of the underfloor modifications and it wasn't deemed to be worth the
major effort required
to relocate the turbos and all the associated
plumbing. Back to back testing against the 962C
modified
to the Busby upgrades (sans underfloor) still showed the air cooled car
to be superior. The water cooled car would end up being the
team's
spare chassis and was raced infrequently. Note the lack of the massive overhead intercooler. Intecooling for the twin turbo 962C engine was handled separately for each turbo. The intercoolers were much smaller and located one in each side pod.
