- There's no doubt the R32 GTR is a popular package when it comes to circuit racing.
One of the downsides with that GTR chassis though is it's inherently
pretty heavy.
Xtreme GTR have done an amazing job of building a lightweight R32 GTR,
with the use of a huge amount of carbon fibre.
Every single panel on this car is built from dry carbon by Topstage Composites.
Now unfortunately Xtreme GTR haven't had an amazing run here
at World Time Attack and the car suffered from an engine bay fire last year,
before it even managed to get a single timed lap on the board.
So this created a huge amount of work for the team over the last 12 months,
with essentially everything from the firewall forward being destroyed
in that fire.
So we've got the car behind us, it's been completely rebuilt and it's ready
to run here at World Time Attack challenge 2018.
We're going to go over what has gone into this amazing quality build.
And it starts with the RB28 engine.
Now this isn't built around a stock RB26 block though.
At the sort of power levels you need to be competitive in the open class
here at World Time Attack, the stock cast iron block has been proven
to be pretty unreliable.
The team at Xtreme GTR went straight for the top shelf with a billet
aluminium engine block.
Now this has been fitted with a Nitto 2.8 litre stroker crank,
a set of Carrillo rods, and a set of pistons from SPS.
The advantages of the billet block obviously include its strength first
and foremost.
Now it's fitted with a set of ductile iron sleeves.
These are both stronger and thicker than the stock sleeves in the factory
cast iron block.
The deck surface is also thicker than the stock block, and this helps improve
the ability to hold the cylinder head onto the engine block,
improving that head gasket seal, which is so important when you're
running very high boost levels.
This is also aided by a larger set of head studs that go into the billet block.
Now the other aspect with the billet block is that its also a lot lighter
than the cast iron stock block.
Topping the cylinder block is a fully race prepared RB26 cylinder head.
And this is really one of the keys to getting air flow both in and out
of that engine.
On the exhaust side we've got a Precision 6870 turbocharger,
which is probably a little bit smaller than some of the teams at this level
are running.
And really here it's all about balancing the power delivery with the ultimate
power level.
It's all about getting a wide enough power band or rev range that's usable around
the racetrack.
At the moment the car is running approximately 950 wheel horsepower,
running around about 32 psi of boost on E85 fuel.
The compressed air exiting that turbocharger runs through a front
mounted PWR intercooler before heading into a Hypertune plenum.
As is common with RB26 based engines at this sort of power level,
the factory individual throttle bodies have been ditched in favour
of a single plenum fronted with a large drive by wire throttle body.
The electronics package controlling the car all comes from Motec and includes
an M150 ECU in charge of the engine control, a pair of Motec PDM15
power distribution modules which are in control of distributing power
to all of the circuits for both the engine and the chassis.
On top of this, there's a Motec C187 dashlogger and this doubles as both
the driver display as well as a central logging unit where all of the data
from the chassis and the engine can be stored and analysed.
Backing the engine and getting that power to the ground is an Albins
ST6 six speed sequential transmission.
Now this is still mated to the factory Nissan R32 four wheel drive transfer case
so the car still retains four wheel drive.
That Albins six speed sequential gearbox also makes use of a strain gauge
gear lever which communicates to the Motec M150 ECU.
This lets the ECU know when the driver is pulling back on the lever requesting
an upshift and then the ECU can perform an ignition or fuel cut to allow
a clutchless full throttle shift to be completed.
On the downshift, the driver can concentrate solely on braking and the auto blip
is controlled via the ECU and that drive by wire throttle when the driver
pushes the gear lever forward.
Now while Xtreme GTR haven't had the best luck so far at World Time Attack,
we class this car as one of the tidiest and best built examples we've seen,
and we really hope that they get to show the world exactly what this car is capable
of tomorrow in competition.
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