Changes made to a MKII GT40 Superformance

Hey everyone.
I thought you might be interested in the work that has gone into completing a Superformance GT40. The work we completed was due to it being necessary, by choice, or required for compliance.
Changes to GT40

New Door locks, and fabricate pull down handles

Steering column made into one piece by steering wheel

Steering rack lifted for bump steer

Sway bar linkages modified

Number plate brackets front and rear

Steering wheel changed

Changed location of oil reservoirs

Modified bell housing, with flap

Replaced Engine mounts as originals supplied weren’t correct

Silencing exhaust

Remake gear shift linkages

Install CO2 sensors on exhaust for Dynatune

Firewall modified, with moulded cover plate

Modified upholstery( chop rear out of seats, and new centre consol between seats)

Installed headrests

Install pedal stop for clutch

Had to change plumbing to brake/clutch as plumbed wrong from factory

Hardline brake and clutch lines at pedal box

Return spring on brake pedal

New brake pedal

Update nuts and bolts throughout car to include split washers and nylok nuts

All nuts and bolts upgraded and stamped ISO

New ignition barrel

Installed instrument name plate

Install fire extinguisher

Install rear vision mirror

Install side mirrors, fabricated bases

Installed brake light

Install number plate light

Installed gas struts to hold up rear clam

Installed locking strut on front hatch

Air con gassed

Bearing out of suspension and replaced with stamped ones

Sandblasted suspension arms to have them xrayed, then powder coated again

Installed trickle charge do battery

Installed swirl tank, 1 x low pressure pump and 1 x high pressure pump

Installed fuel injection

Installed dry sump pump and reservoir

Changed out internal hydraulic clutch cylinder after seal broke

Heat shield installed

Install fuel lines, oil lines, Autronic computer, electric transmission pump

Dry sump pulley made

Bracket made for alternator

Adaptor plate made for steering wheel conversion

Fabricate speedo adaptor (made by Robinson’s)

Installed cutoff switch from battery

Fabricated half shaft adaptors

Exchanged cv joints for Pantera universals

Transaxle crown wheel changed over

Secure all cables and lines to chassis at every 300mm

Gulf transfer sticks and rondel numbers

Made plate to hold petrol pumps

Installed pressure gauge on line to fuel rails

Replace seals on fuel rails

Install all fuel and oil lines with braided lines and AN fittings

Install locating pin receiver for front and rear clams

Changing out steel above pedal box so that it bolts in and can be removed to access pedal box

Made jack adaptor for front and rear of car

Made tow adaptor for winc

Wire wheel for knock ons

Bump steer test

Doors off

Replaced cap on wiper (Porsche 911)

Replace cut seat belt

Cut clearance out of top of firewall for distributor

Shortened water neck on water pump to stop it rubbing on firewall

45 degree bends put onto exhaust

Wiper motor was wired up wrong

Split on rubbers for doors

GT40 carpet logo on tanks

Relocate rear sway bar as wouldn’t fit under exhausts (turned on side)

Installed spring washers under all fixings for petrol tanks, front and rear.

Faulty fuel cap - rethreaded (possibly cross threaded from factory)

Made bracket for new reservoirs and plate to close up old location, upgraded from rubber lines to steel braided lines

Shortened fuel rails to make room for heat shield

New rubbers for suspension

Fitted collector tank for condensation from engine

Changed distributor as one supplied wouldn’t fit, and had to be compatible with fuel injection

New starter motor

Engine in

Ordered 3 x lots of alcantara before correct one arrived.

Changed 5 reverse gears to 5 forward gears (long story)

Install door pull handles

Modify pedal box top fixing bracket so that it is bolted and can be removed.

Extra height to oil cooling tower so it clears battery
Fabricated shroud to cover intrusion of water pump through firewall

Exchanged locating studs for top two internal bell housing bolts for easier access to internal hydraulic clutch in the future

Dashboard out due to factory paint peeling off - painted / reinstalled

To do: install 2 x Stewart Warner pumps, install 3x rondel lights and wiring, connect air con
 
Specs
Vehicle details: Superformance MKII

Engine: Shelby FE 427 Side oiler, stroked to 482ci, aluminium block and heads.

Block internal specs: 4340 Steel crank with forged H-beam rods, Arias pistons, Shelby aluminium 356 T6 CNC machined

Cylinder head specs:Aluminium medium riser heads, s/s rocker arms with roller tips.hydraulic roller cam

Intake system: TWM fuel injection, 58mm throttle bodies

Fuel system: High pressure Bosch 044, low pressure Carter from swirl tank. Two s/s tanks connected via crossover line. 40 litres each ( 10.5 gallons )

Ignition system: Autronic SM4

Exhaust system: Ceramic Bundle of snakes with full crossover design

Cooling system: High performance aluminium two-core radiator with two electronically controlled electric fans

Engine management: Autronic SM4

Other engine bay info: Aviaid competition dry sump, 4 stage Series 1 dry sump pump with 1 pressure and 3 scavenge sections

Driveline

Gearbox make/model: ZF transaxle, 5 speed, 5ds-25-2, polished casing

Gearbox additional info: Tilton external electric pump

Flywheel/clutch: 12" McLeod clutch, billet steel flywheel, Tilton hydraulic internal release bearing

Diff/axels: Pantera universal half-shafts (high HP)
Other driveline components: Kennedy alloy bellhousing

Suspension

Front suspension type: Original style, fully independent suspension using unequal length A-arm design, coil springs over telescopic shock absorbers, adjustable ride height and anti-roll bar

Rear suspension type: Original style, fully independent suspension using radius rods, unequal length A arm design, with a toe control link, adjustable coil springs over telescopic shock absorbers, adjustable ride height and anti-roll bar

Shocks: Eibach shocks

Springs: Eibach Federn springs

Brakes

Pedal/booster: N/A. Separate front and rear master cylinders. Adjustable front to rear brake bias via balance bar

Front: Wilwood 4-pot 12.75" x 1.25" ventilated discs

Rear: Wilwood 4-pot 12.75" x 1.25" ventilated discs

Wheels/Tyres

Wheels make/model: Halibrand

Wheel size - front: 15" x 8"

Wheel size - rear: 15" x 10"

Tyre brand and width - front: Goodyear 235/60 R15
Tyre brand and width - rear: Goodyear 295/50 R15

Vehicle exterior


Panel and paint: Hand-laid fibreglass panels with vinyl ester resin
Paint colour: Gulf Oil Racing colours

Chassis - jig-welded monocoque steel

Interior
Seats: Alcantara upholstery
Steering wheel and shifter: Original style 14" removable Motolita steering wheel. Right hand sill shifter

Gauges/meters: Smiths

Other notable interior modifications: Willans 4 point harness racing seat belts, adjustable pedalbox
Performance

Dyno power - +600hp
 
New roller. More work than you’d imagine when you buy one
Just so potential SPF buyers know the vast majority of the mods you did were by choice. Nothing wrong with personalizing or optimizing your SPF. I had to do maybe half a dozen things to my Mk 11 when I bought it 15 years ago. As far as compliance issues that would vary depending on where you title the car.
 
Last edited:
Hey everyone.
I thought you might be interested in the work that has gone into completing a Superformance GT40. The work we completed was due to it being necessary, by choice, or required for compliance.
Changes to GT40

New Door locks, and fabricate pull down handles

Steering column made into one piece by steering wheel

Steering rack lifted for bump steer

Sway bar linkages modified

Number plate brackets front and rear

Steering wheel changed

Changed location of oil reservoirs

Modified bell housing, with flap

Replaced Engine mounts as originals supplied weren’t correct

Silencing exhaust

Remake gear shift linkages

Install CO2 sensors on exhaust for Dynatune

Firewall modified, with moulded cover plate

Modified upholstery( chop rear out of seats, and new centre consol between seats)

Installed headrests

Install pedal stop for clutch

Had to change plumbing to brake/clutch as plumbed wrong from factory

Hardline brake and clutch lines at pedal box

Return spring on brake pedal

New brake pedal

Update nuts and bolts throughout car to include split washers and nylok nuts

All nuts and bolts upgraded and stamped ISO

New ignition barrel

Installed instrument name plate

Install fire extinguisher

Install rear vision mirror

Install side mirrors, fabricated bases

Installed brake light

Install number plate light

Installed gas struts to hold up rear clam

Installed locking strut on front hatch

Air con gassed

Bearing out of suspension and replaced with stamped ones

Sandblasted suspension arms to have them xrayed, then powder coated again

Installed trickle charge do battery

Installed swirl tank, 1 x low pressure pump and 1 x high pressure pump

Installed fuel injection

Installed dry sump pump and reservoir

Changed out internal hydraulic clutch cylinder after seal broke

Heat shield installed

Install fuel lines, oil lines, Autronic computer, electric transmission pump

Dry sump pulley made

Bracket made for alternator

Adaptor plate made for steering wheel conversion

Fabricate speedo adaptor (made by Robinson’s)

Installed cutoff switch from battery

Fabricated half shaft adaptors

Exchanged cv joints for Pantera universals

Transaxle crown wheel changed over

Secure all cables and lines to chassis at every 300mm

Gulf transfer sticks and rondel numbers

Made plate to hold petrol pumps

Installed pressure gauge on line to fuel rails

Replace seals on fuel rails

Install all fuel and oil lines with braided lines and AN fittings

Install locating pin receiver for front and rear clams

Changing out steel above pedal box so that it bolts in and can be removed to access pedal box

Made jack adaptor for front and rear of car

Made tow adaptor for winc

Wire wheel for knock ons

Bump steer test

Doors off

Replaced cap on wiper (Porsche 911)

Replace cut seat belt

Cut clearance out of top of firewall for distributor

Shortened water neck on water pump to stop it rubbing on firewall

45 degree bends put onto exhaust

Wiper motor was wired up wrong

Split on rubbers for doors

GT40 carpet logo on tanks

Relocate rear sway bar as wouldn’t fit under exhausts (turned on side)

Installed spring washers under all fixings for petrol tanks, front and rear.

Faulty fuel cap - rethreaded (possibly cross threaded from factory)

Made bracket for new reservoirs and plate to close up old location, upgraded from rubber lines to steel braided lines

Shortened fuel rails to make room for heat shield

New rubbers for suspension

Fitted collector tank for condensation from engine

Changed distributor as one supplied wouldn’t fit, and had to be compatible with fuel injection

New starter motor

Engine in

Ordered 3 x lots of alcantara before correct one arrived.

Changed 5 reverse gears to 5 forward gears (long story)

Install door pull handles

Modify pedal box top fixing bracket so that it is bolted and can be removed.

Extra height to oil cooling tower so it clears battery
Fabricated shroud to cover intrusion of water pump through firewall

Exchanged locating studs for top two internal bell housing bolts for easier access to internal hydraulic clutch in the future

Dashboard out due to factory paint peeling off - painted / reinstalled

To do: install 2 x Stewart Warner pumps, install 3x rondel lights and wiring, connect air con
Hey everyone.
I thought you might be interested in the work that has gone into completing a Superformance GT40. The work we completed was due to it being necessary, by choice, or required for compliance.
Changes to GT40

New Door locks, and fabricate pull down handles

Steering column made into one piece by steering wheel

Steering rack lifted for bump steer

Sway bar linkages modified

Number plate brackets front and rear

Steering wheel changed

Changed location of oil reservoirs

Modified bell housing, with flap

Replaced Engine mounts as originals supplied weren’t correct

Silencing exhaust

Remake gear shift linkages

Install CO2 sensors on exhaust for Dynatune

Firewall modified, with moulded cover plate

Modified upholstery( chop rear out of seats, and new centre consol between seats)

Installed headrests

Install pedal stop for clutch

Had to change plumbing to brake/clutch as plumbed wrong from factory

Hardline brake and clutch lines at pedal box

Return spring on brake pedal

New brake pedal

Update nuts and bolts throughout car to include split washers and nylok nuts

All nuts and bolts upgraded and stamped ISO

New ignition barrel

Installed instrument name plate

Install fire extinguisher

Install rear vision mirror

Install side mirrors, fabricated bases

Installed brake light

Install number plate light

Installed gas struts to hold up rear clam

Installed locking strut on front hatch

Air con gassed

Bearing out of suspension and replaced with stamped ones

Sandblasted suspension arms to have them xrayed, then powder coated again

Installed trickle charge do battery

Installed swirl tank, 1 x low pressure pump and 1 x high pressure pump

Installed fuel injection

Installed dry sump pump and reservoir

Changed out internal hydraulic clutch cylinder after seal broke

Heat shield installed

Install fuel lines, oil lines, Autronic computer, electric transmission pump

Dry sump pulley made

Bracket made for alternator

Adaptor plate made for steering wheel conversion

Fabricate speedo adaptor (made by Robinson’s)

Installed cutoff switch from battery

Fabricated half shaft adaptors

Exchanged cv joints for Pantera universals

Transaxle crown wheel changed over

Secure all cables and lines to chassis at every 300mm

Gulf transfer sticks and rondel numbers

Made plate to hold petrol pumps

Installed pressure gauge on line to fuel rails

Replace seals on fuel rails

Install all fuel and oil lines with braided lines and AN fittings

Install locating pin receiver for front and rear clams

Changing out steel above pedal box so that it bolts in and can be removed to access pedal box

Made jack adaptor for front and rear of car

Made tow adaptor for winc

Wire wheel for knock ons

Bump steer test

Doors off

Replaced cap on wiper (Porsche 911)

Replace cut seat belt

Cut clearance out of top of firewall for distributor

Shortened water neck on water pump to stop it rubbing on firewall

45 degree bends put onto exhaust

Wiper motor was wired up wrong

Split on rubbers for doors

GT40 carpet logo on tanks

Relocate rear sway bar as wouldn’t fit under exhausts (turned on side)

Installed spring washers under all fixings for petrol tanks, front and rear.

Faulty fuel cap - rethreaded (possibly cross threaded from factory)

Made bracket for new reservoirs and plate to close up old location, upgraded from rubber lines to steel braided lines

Shortened fuel rails to make room for heat shield

New rubbers for suspension

Fitted collector tank for condensation from engine

Changed distributor as one supplied wouldn’t fit, and had to be compatible with fuel injection

New starter motor

Engine in

Ordered 3 x lots of alcantara before correct one arrived.

Changed 5 reverse gears to 5 forward gears (long story)

Install door pull handles

Modify pedal box top fixing bracket so that it is bolted and can be removed.

Extra height to oil cooling tower so it clears battery
Fabricated shroud to cover intrusion of water pump through firewall

Exchanged locating studs for top two internal bell housing bolts for easier access to internal hydraulic clutch in the future

Dashboard out due to factory paint peeling off - painted / reinstalled

To do: install 2 x Stewart Warner pumps, install 3x rondel lights and wiring, connect air con
Hey Cam, lot of work! Sounds like it will be awesome. I have a SPF mark Ii, new last year. Curious if you are using original shifter. I am not happy with the OEM and am in process of upgrading to CNC performance. It's requiring a few mods but hopefully worth it.
 
Just so potential SPF buyers know the vast majority of the mods you did were by choice. Nothing wrong with personalizing or optimizing your SPF. I had to do maybe half a dozen things to my Mk 11 when I bought it 15 years ago. As far as compliance issues that would vary depending on where you title the car.
Its here in NZ, Bear in mind our rules around any alteration and initial registration of specialty cars has become a nightmare in recent times.
 
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