Phillip Island - 11th
November
2006
Overview
Photos
Car Preparation
Strengths & Weaknesses
Mods To Be Done
Overview
Man, Phillip Island is faaast! I knew
from when I was there in the rain in July that it's a fast
circuit, but to be able to experience corners flat out in 4th
gear is another level altogether! The plan was to do the
practice day on Saturday then enter the Super Sprint event on
Sunday for official timing but the weather didn't quite hold up
with rain closing in early Sunday morning. It did eventually
pass but I'd already decided not to run the 2nd day.
I found this graphic on
PlanetSoarer and the
aerial photo on the
Phillip Island Circuit website to show the layout.


We were hand timing on Saturday so it
wasn't totally accurate but good enough to see how we were
faring. I was running 2nd hand slicks which were not exactly
fresh so they felt as good as a decent set of semi slicks - only
much cheaper. We had 4 x 15 minute sessions and by the 3rd I'd
gotten down to 1:59.5 with thanks to Rob Hayden for passing on
some of his intimate knowledge of the more tricky sections.
Pretty happy with a sub-2 minute laptime on my first dry day at
the Island :-)
Photos
Big thanks to Greg Nikitiuk, Ben
Socratous and Craig Webber for the shots. One of the great
things about Phillip Island is the range of cars to check out
between sessions. Click on any of the photos to open a larger
copy in a new window.
The blue ford with the
bug catcher out the bonnet is a ute which apparently has
600kw. It has a big centrifugal supercharger feeding the V8
and it went past me down the straight like I was standing
still... except I was doing 200km/h!
Car Preparation
1. Lightened flywheel
My original flywheel weighed in at 11kg
which is fine for cruising around as it ensures a smooth clutch
take up and makes it practically impossible to stall. However,
all the spinning inertia means the revs don't drop in the
fraction of a second between gearshifts which was putting some
shock through the drivetrain. It also dampens the throttle
response somewhat so it was sent off to be lightened. The
clutch/pressure plate went with it so the machinist could see
where material could be removed. Unfortunately the courier lost
the package (which has since turned up) so I bought one of these
aluminium flywheels and an 850kg clutch to go with it otherwise
I wouldn't have made it.

The flywheel weighs 5.5kg, so half the
original but it's still very easy to drive thanks to the
full-face organic clutch. I'm not into drags so I don't need
anything extreme like a puck clutch. Gearshifts on the track are
much smoother as the revs match better and it feels a bit more
responsive, so thumbs up all round and a big thank you to Neil
Griffiths for getting it back together in time!
2. Bonnet pins
After seeing the corners of my CF bonnet
lifting last time I was at Phillip Island it was obvious bonnet
pins are a must. I had a secondary bonnet restraint attached to
the factory latch but still... Anyway I didn't want the standard
bonnet pins as they stick out like dog's balls and they're
illegal on the road so it's an invitation for Police attention.
As I mentioned a couple of weeks back I bought some of these
AeroCatch
bonnet pins which are perfect on a CF bonnet. Nice and subtle
and very well made.


3. Rear Wing
I thought I'd try some aero
mods and fitted an aluminium twin element wing to a spare
bootlid I have. It's only a cheap wing but it damn well works as
the top element was visibly bending down in the middle at speed
even when on the flattest setting. The top element is on the
steepest angle in this pic.

4. Front Splitter
The last thing I wanted was
to have the front end go light due to the downforce on the boot
so Neil and I quickly made this plywood front splitter the day
before I drove down. It's not ideal as it doesn't go the full
width but we couldn't get plywood long enough in time (excuse
the grubby appearance!)


It definitely helped though
as my car always had a bit of a "nose up" attitude when under
power down the straight whereas it's perfectly flat in this shot
even with the extra downforce on the boot. I'm actually doing
about 180km/h here :-)

5. Standard checks
Also checked regular things
like oil level, tyre pressure, brake pads, bled the brakes etc
to ensure it's all tip-top for a bit of a thrashing.
Strengths & Weaknesses
After the day I jotted down
the strengths and weaknesses to identify what needs attention
before the next outing.
Strengths
-
Rear-end grip
-
Turn-in at speed
-
High-speed stability
-
Brakes (Celsior
4-pot)
Weaknesses
-
Grunt. Really
need to fit the new cams to get more power higher in the rev
range.
-
Oil surge. A
couple of times when exiting southern loop (turn 2) the oil
pressure warning went off. It didn't drop to 0 but it's
enough to worry me.
-
Fuel surge. This
has always been a issue when the fuel gets below halfway.
-
Drag. Noticeably
poorer fuel economy with the front splitter and wing in
place.
-
Some front-end push
at low speed.
Mods To Be Done
1. Finally fit the new
heads & cams and get it retuned!
2. Fit an
Accusump
to look after oil pressure during hard cornering.
3. Fit a surge tank and
external fuel pump.
4. Make a front splitter
wide enough to go all the way to the edges so the air doesn't
drop straight into the front tyres which are a highly turbulent
area. I'll also adjust the the top element of the wing so it's
even flatter than I had it to reduce some drag as rear-end grip
is ample.
5. Maybe increase the front
camber at the track to improve turn-in at Siberia (turn 6). If
it's too hard to do it at the track I'll live with what I have
as I don't want to chew out my tyres on the road.
The next trackday at
Phillip Island is the weekend of the 17th & 18th of February
2007 so I have a bit of time to prepare. |