“Mighty Mits” Drag Car Project – Naturally Aspirated Info
Back Ground Information – 4G54
This project was started with the intention of developing the Astron 2.6 engine and other Mitsubishi, Proton & Hyundai motors for improved performance and reliability. General knowledge learnt from this exercise goes directly into the development of RPW Racing engines which are sent worldwide. This is seen in many of the developments running our Quad Throttle Body assemblies particularly.
One Question asked – why so many versions of the same motor. Every time we find a weak link we fix that particular problem only to find another weak link. It is an on going chain and one that will never stop. Additionally as new ideas emerge, as our experience with drag racing and other projects increase, we automatically look to upgrade the drag car in an continuing effort to go faster. Compare the stage 1 to the newly developed stage 8 motor and you can see the difference in the strength of the components being used.
For the season of 2002 / 2003 RPW experimented with Nitrous system adapting the Ozrace progressive stage wet nitrous fogger system which worked extremely well with our carburetted engine and led the way for the knowledge of our developing systems.
For the season of 2006/07 we are breathing new life back into the old galant with a turbocharger set-up. For more information on this particularly check out the turbocharger information page on the Mighty Mits Galant
Astron 2.6 4G54 Engine
12.920 @ 103 mph at Quit Motorplex 13/01/01 running Version 7 Motor with street extractors and gear changes at 8000 rpm!
23/11/01 – Version 8 motor dyno’d at 180hp @ 7000 rpm rear wheels with overloaded ignition system and no muffler.
15/01/02 – Version 8 motor dyno’d at 167hp @ 67000 rpm rear wheels with muffler and running rich – Motorvation 2002 Show
|Model||GC Galant 2dr Hardtop|
|Year of Manufacture||1976|
|Motor Type and Designation||Mitsubishi Astron 2.6 Litre 4 Cylinder Naturally Aspirated|
|Fuel Type||Aviation Gas up to December 2002, VP Motorsport 103 Carburettors, VP C16+ Nitrous, VP109 Unleaded Racing Fuel for Supercharged Engine|
|Ignition||Crane Electronic including Coil Fireball XR3000 Stages 1 to 7
Crane HI6 Electronic ignition Incl Coil with built in RPM limiter set to 9300 rpm Stage 8
Crane Hi6 Ignition Retard via micro switch when activated with Nitrous System Haltech E6X System controlling four independent Bosch Coils full Sequential System
|Drive Train||Mitsubishi Galant 4 speed gearbox Version 1 – 7
Mitsubishi Galant 4 speed gearbox modified synchros with custom short shifter set-up Version 7 & 8
|Differential||Mitsubishi Galant Standard Differential Ratio 3.542 : 1 up to 30/8/1998|
|Differential||Mitsubishi Galant Standard Differential Ratio 3.899 : 1 from 30/8/1998 to 20/12/1999|
|Differential||Mitsubishi Pajero Locked Differential Ratio 4.625 : 1 from 20/12/1999 to 20/02/2000|
|Differential||Mitsubishi Pajero Locked Differential Ratio 4.875 : 1 from 20/02/2000|
|Rear Suspension||Four Std Leaf Springs, Monroe Heavy Duty Gas Shock Absorbers fitted with Nolathane Suspension Bushes.|
|Front Suspension||Kmac Heavy Duty Front Springs with Gabriel Heavy Duty Gas Shock Struts|
|Wheels||14″ all round, 255/60 McCreary slicks rear, 195/70 front Goodyear radials from 30/8/98|
|Brakes||Up to 25/10/2001 – standard Mitsubishi Galant front brakes 229mm diameter.
From 25/10/2001 – fitment of GH Scorpion 255mm Front discs and callipers.
From 16/06/02 – Fitment of rear discs to vehicle 180mm diameters.
|Body Modifications||Fibreglass bonnet, lightened body with fuel cell and large air scoop attached to the passenger side. Fitment of aluminium roll cage and four strap harness with competition seat.|
Version 8 – Current Motor Specifications 4G54 (July 2003)
Versions 1 – 7 Engine Specifications (July 2003)
|Bore Size||Not Available|
|Cubic Capacity||2.6L (1.57 Cubic Inches)|
|Piston Type||Hyper-eutectic – Flat Top Design, HPC Ceramic coated on top with HPC Silicon treated piston skirts.|
|Piston Ring Type||Speed Pro File fit ring sets Plasma Molly|
|Engine Block Modifications||Copper O Rings with ARP Studs all throughout|
|Conrods||Aluminium Billet Conrods with ARP Bolts|
|Crankshaft||Lightened, Neutral Balanced and Stroked|
|Flywheel & Clutch||Carbon Steel Billet & super light flywheel with Heavy duty cover plate and Semi Solid Ceramic paddle clutch disc.|
|Harmonic Balancer||Ross Racing Products full 1 piece billet harmonic balancer with twin key-ways.|
|Cylinder Head||Ported & Flowed Cylinder with Stainless Steel Oversize valves|
|Camshaft||Stage 7 Full Drag Specifications roller rocker adjustable tappet camshaft|
|Carburettor||Twin Side draught 55mm Webber Carburettors with custom intake manifold|
|Nitrous System||Ozrace Wet Fogger individual nozzle system with two stage progressive system. Check photos in Photo section. Edelbrook 10lb bottle in passenger side of car.|
|Exhaust||Stepped Headers – Four into One System with tuned pipe lengths manufactured by Jeff Garland at Exhaust Dynamics.
HPC Ceramic Coated in Silver Aluminium – Check out Photo’s.
|Cyl Head Components||Modified Rocker Gear Assembly to suit Roller Rocker Camshaft Geometry.|
|Bore Size||Not Available|
|Cubic Capacity||2.85 Litre (169 Cubic Inch) – Versions 1,2 & 4 & 6
2.90 Litre (171 Cubic Inch) – Versions 3 & 5
2.60 Litre (155 Cubic Inch) – Version 7
|Compression Ratio||13.0 : 1 – Versions 1 to 4
14.5 : 1 – Version 5 to 7
|Piston Type||Hyper-eutectic Flat Top|
|Piston Ring Type||Sealed Power Chrome Molly Ring Sets – Version 1, 2 & 7
Total Seal Gapless Plasma Molly Ring Sets – Version 3 – 6
|Engine Block Modifications||ARP Studs all throughout. Versions 1 to 7|
|Conrods||Modified stock conrods, lightened with ARP Bolts. Versions 1 to 6
Ridgecrest Engineering Aluminium super light conrods with ARP conrods bolts Version 7
|Crankshaft||Lightened, Neutral Balanced and Stroked. Versions 1 to 7|
|Flywheel & Clutch||Lightened, Neutral Balanced standard flywheel with Semi Solid, Ceramic paddle clutch disc. Cover plate of various strengths during time period Versions 1 – 7|
|Cylinder Head||Stock Cylinder Head Mildly Ported – Version 1 & 2
Stock Cylinder Head Massively Ported with stock sized valves – Versions 3 – 6 Race Ported and Polished cylinder head with o/size valves.
|Camshaft||Stage 3 Hot Street / Strip Flat Tappet – Version 1
Stage 7 Full Drag Specifications Flat Tappet – Versions 2 – 7
|Carburettor||Twin Downdraught 180cfm Holley – Versions 1, 3, 4
Twin Downdraught 250cfm Webber – Versions 2 & 5
Twin Side draught 45mm Webber’s with 30mm Ram Tubes Version 5 & 6
Twin Side draught 55mm Webber’s with 40mm Ram Tubes – Version 6 & 7
|Filtration||K&N Rally Air Cleaners – Versions 1 – 5|
|Exhaust||Open Modified Extractors to 3″ outlet – Versions 1 to 3
Modified Genie brand 1 7/8″ Headers to 2 1/5″ Open Outlet – Versions 4 to 5
Race Spec four into one tuned stepped headers with 3″ Open outlet Version 6 & 7
Cyl Head Components
|Modified Rocker Gear Assembly|