936hp 6.7L Twin Turbo

HSV ClubSport R8

My ClubSport has been built to be a road legal, street driveable car with an insane level of power and race track handling. I have deliberately kept it looking like a standard ClubSport, the only visible difference being the very low stance. The interior and under the bonnet maintains this "factory" theme.  J

I chose the HSV (Holden Special Vehicles) ClubSport R8 because both Holden and HSV have factory teams racing V8 Supercars, and a lot of this motorsport heritage is already reflected in it. 

For reliable power on the street, I chose a twin turbocharger system as it delivers a broader power band and more power to the wheels than a supercharger can at similar boost levels. I decided on the APS Twin Turbo system because of its quality, power potential and in particular, it's "stealth" design.

The motor has been bullet proofed with forged steel 6 bolt main bearing caps with ARP studs, a forged Eagle 4.000" stroke crankshaft and 6.125" Eagle H beam forged conrods with ARP2000 conrod bolts.

Forged JE 4.035" -29cc inverted dome pistons reduce compression to 8.6:1 and raise the motor's cubic capacity to 409 cubic inches (6.705 litres).

GM Performance LQ9 6.7 litre (409 cu in) iron block /  JE forged pistons and Eagle forged H Beam rods:

High flowing LS3 rectangular port heads were fitted with an ARP Performance Head Stud kit and PAC Racing valve springs. A custom grind COMP Cams hydraulic roller camshaft with GM Racing Hydraulic roller lifters and Manley Chrome Moly pushrods completed the package.

Two Harrop high capacity fuel pumps, dual fuel lines and billet fuel rails were installed together with a custom made stainless steel 3.5" dual exhaust with high flow cats and quad tail pipes.

To match the awesome increase in power, a triple plate carbon fibre clutch with a billet steel flywheel and ARP bolts was added and the rear tyres were increased to 285mm wide.

The suspension also received a complete workover, with Tien coil-over's, Pedders fully adjustable front and rear stabiliser bars, Nolathane bushes and an alloy Pedders strut brace. The Tien shocks are fully adjustable, both front and rear, with an electronic dampening force controller that is operated from within the drivers cabin.

For more detailed information about this build read on:

SPECIFICATIONS:

Motor:

6,705cc (409 cu in) GM Performance LQ9 iron block V8 with forged and studded 6 bolt main bearing caps.

JE FSR (forged side relief) -29cc inverted dome pistons 4.035" / 102.36mm

JE Pro Seal Piston Rings, JE heavy duty gudgeon pins, ARP Pro Series Head Stud and Main Stud kits.

Eagle 6.125" forged H-beam con-rods with ARP2000 bolts.

Eagle forged steel crankshaft: stroke = 4.000" / 101.60mm

Clevite high performance NASCAR big end bearings, ACL race series heat teated main bearings

LS3 rectangular port cylinder heads, 2.16" intake valves and 1.60" exhaust valves, ARP head stud kit

COMP Cams hydraulic roller camshaft, LS7 camshaft gear, GM Performance Racing roller hydraulic lifters,

PAC Racing valve springs, Yella Terra 1.7:1 ratio shaft roller rockers, Manley 4130 Chrome Moly pushrods

Multi-point injection fuel system, acoustically tuned LS3 composite intake manifold

Lubrication: Nulon Full Synthetic 5W-30 with AAT

Power:

Dynoed on 26/09/2009: 545.7kW (731.8hp) at the rear wheels in 5th gear, or 698kW (936hp) at the flywheel.

Turbocharging System:

APS "Stealth" Twin Turbo system.

A lot of work was done to keep the engine bay looking standard. All plumbing is kept under the engine covers, the blow-off valve is hidden inside the original air filter box and the turbochargers are underneath the car, behind the motor; a design which is extremely beneficial in minimising under bonnet temperatures:

Under car photos showing turbocharger positioning...

The left hand side cold air intake with K&N XStream airfilter can be seen in this detail pic...

Details:

Twin custom Mitsubishi 500hp rated turbochargers with Inconel 713C turbine wheels. Liquid cooled bearing housing, APS single entry .85 A/R turbine housing with external wastegate port and APS designed & manufactured .65 A/R compressor housing.

Twin TIAL external wastegates

High volume, twin vent APS blow off valve.

2 bar MAP sensor

APS high energy, high silicon/moly iron, precision NC machined, hand matched exhaust manifolds.

Polished stainless steel TIG welded APS turbo discharge ducting.

Dual highflow TIG welded stainless steel cold air intake system custom fabricated by Stuart Vale of Racers Choice utilising twin K&N XStream RX-3900-1 air filters.

Vertical flow, high efficiency bar & plate core intercooler. 1100 horsepower capacity. Dual entry design with equal length balanced ducting from each turbocharger.

Fuel System:

Two Harrop high volume in-tank fuel pumps. Twin fuel lines and fuel pressure regulators. Billet fuel rails. Siemens 60lb Deka IV Mototron 30 degree spray pattern fuel injectors. These injectors flow at 60 lbs/hr at 43.5 psi (3 bar) or 7.6 gm/sec. At 87 psi they flow at 85 lbs/hr or 10.7 gm/sec. Standard LS3 injectors are the same as the LS7 and flow at 5.0 gm/sec.

Exhaust:

Custom made dual 3.5" polished stainless steel system with quad tail pipes fabricated by Autotech Engineering:

Transmission:

6 Speed Tremec manual transmission with Billet Products Pro shifter:

Extreme triple plate carbon fibre clutch, steel flywheel and ARP 2000 bolts.

Diff:

3.7:1 Limited Slip Diff mounted with urethane bushes:

Suspension:

The suspension system has some of the best handling technologies available for a street car today. For example, the ClubSport's height and weight distribution are fully adjustable with Tien coil-over springs, both front and rear stabiliser bars are fully adjustable, the front and rear shock absorber damping is also electronically adjustable. Suspension alignment is maintained during hard cornering through the addition of an alloy strut brace and the fitment of urethane bushes throughout.

Below is a pic of my ClubSport alongside Tony's beautiful 20th Anniversary edition ClubSport which has standard suspension and 19" wheels.

TEIN Electronic Dampening Force (EDFC) step motors are mounted on each shock absorber, with front and rear suspension adjustments able to be made by the driver via the Control unit mounted in the cabin...

The below pics show the GReddy Boost Controller and the TIEN suspension EDFC control unit that have been mounted on a panel inside the glovebox to maintain the "stealth" look of the Clubsport...

Rear Coil-over Suspension, adjustable Sway Bars and Urethane bushes...

Front Suspension Detail...

Detail of Front and Rear Sway Bar Adjustment...

Brakes:

Front - 365mm Slotted & ventilated discs with 4 piston HSV designed AP Racing calipers. Front: 365mm dia, Rear: 350mm dia. Braking systems include Anti-lock Braking System, Electronic Brakeforce Distribution, Electronic Brake Assist & Electronic Stability Control.

Wheels & Tyres:

Front (Street) - 8" wide shadow chrome VE GTS wheels with 245/35/ZR20 Falken FK452 tyres.

Rear (Street) - 9.5" wide shadow chrome VE GTS wheels with 285/30/ZR20 Falken FK452 tyres.

Rear (Race) - 9.5" wide ROH Custom 3 piece shadow chrome modular alloy wheels with "Adrenalin" centres and 265/40/R18 Mickey Thompson E/T Street drag radial tyres:

Onyx Leather Interior:

Standard Motor on Left, Twin Turbo Motor on Right:

Picture Gallery:

At NSW All Holden Day, 3rd August 2008:

At Western Sydney International Dragway, 17th August 2008:

At my son Aron's wedding to Amanda, 27th September 2008:

At the Eastern Creek Raceway NSW Skid Pan, 15th November 2008:

At HSV Headquarters and HRT Workshop Melbourne, 26th November 2008:

With my wifes 210kW WRX, 10th January 2009:

Click and enlarge the below photos to see the matching number plates!

HSV Owners Club Cruise to Mount Panorama, Bathurst. Murray's Corner 1st March 2009:

 

HSV Owners Club - Last event at Oran Park 16th August 2009:

 

Paris Hilton has great taste J

Check out the below ClubSport sideways road test video by Vicky Butler-Henderson on 5th Gear:

Click on the following links Left Lane Car News and Motor Magazine for information on the 2009 Pontiac G8 GXP which also has the new 6.2L LS3 motor.

Photo Credit: Pics taken at Pier One, Sydney Harbour, Mount Panorama and below at Oran Park were taken by Paula Botic -   Thanks Paula.

Refer to  Page 2  for full original  HSV ClubSport specifications and to Page 3  for Credits related to my ClubSport project.