The Legend - Proton Wira - 4G92 Rebuild by Simon

Back to Year 2002 ~ My First car was Proton Wira 1.3GL.

I decided to buy this car because Proton Wira was made based on Mitsubishi Lancer Platform and plenty of modification can be done on this car .



Back to year 2004. First modification - Transplant 4G93T 1.8 GSR Engine to my car. Not much modification was done - just enjoy the stock standard 1.8 GSR which produced 181WHP dynoed that time.

At last the 4G93T Engine is blown due to overboost as my turbo actuator are faulty! After deep thinking and finally decided to do transplant to 4G63T - from Mitsubishi Evolution 2.

Modification list:
Garrett GT2835 Turbine
1.2mm Metal Gasket from Tomei
Re Map ECU with Ralliart Chip
Sard 800cc Injector
Walbro Fuelpump
Stock Internal

Pumping out 320WHP but too bad...engine blown when I tried to push it to the limit at 1.7 bar boost!! Am I crazy?!?!?!?!? (a bit la Simon - ED)



With a very tight budget and I must get my car running on the road again, I got no choice but
plug in 4G91 engine to make it running it again. I bought the 4G91 Floor Engine only At RM900, quite cheap back then.

After plugging in the 4G91 Engine, I'm using the Stock 4G93T Turbo ECU code - 5771 with stock GSR Airflow code 449 and stock GSR 390cc Injector. I have no choice but have to mix and match to get the engine started. That time the Fuel consumption is quite high as I'm using 4G93T GSR Turbo stuff on 4G91 N/A engine.



In 2006 I'm thinking out of the box, based on my experience in modifying cars, I came out with an idea - Bolt On Turbo (I think this idea was around a long time ago, sorry didn't want to offend our reader's intelligence - ED).

With all the parts taken off from my previous 4G93T GSR Engine, all the turbo parts was mod into the 4G91 engine.

Here is the modification list:

4G93T TD04L turbine
4G93T Turbo Exhaust Manifold
4G93T Engine Oil Pan
4G93T Cylinder Head



But the 4G93T piston unable to fit in as the original piston bore for 4G91 is 78.4MM and 4G93T piston are 81mm. It very dangerous to bore more than 2mm from the original block , so end up using the stock 4G91 Piston.

4G93T Piston compression ratio around 9:5.1 and 4G91 N/A - around 11:5.1 compression Ratio. Plus 4G91 N/A does'nt have oil squirter to cold the piston and damn!! I put 1.5mm metal gasket to prevent massive engine knocking and to lower the engine compression.

The Engine management system by Greddy E Manage Ultimate as piggy back ecu to control the fuel map and ignition timing. After the modification are done , the maximum boost is around 0.8Bar , and it can't go any higher, it will cause the engine blown again!!

Engine was tuned based on wide band on the road tuning but definitely its more powerful then 4G93 N/A engine but never powerful than 4G93T GSR. Sorry I don't have the dyno chart



Year 2007 - Planning to increase the power of the engine .......... after a careful planning, came out with 4G92 Mivec block interchange !!!


Reason why ???

4G92 Mivec block sharing the same piston size with 4G93T which is 81MM
4G92 Mivec block comes with oil squirter built in
4G92 Mivec con rod its shorter and stronger

This time Major modification going to start but still with tight budget, I told myself ... why people can built a powerful & responsive engine in oversea especially in Thailand but why I can't built it here in Malaysia ? ?

The piston - I modified in the Toyota Supercharger Forged Piston (Flat Type) Compression Ratio - 8:9.1

The Conrod - Ordered from RPW Australia - Billet Forged Con rod

Together with ARP Racing Stud

The Bearing - ACL Racing Bearing

1.8MM metal gasket fitted in from Mitsubishi special ordered from Japan with a help from my friend. This time I upgrade my turbine to TD05H 20G turbo custom built by Tong Turbo in Kuala Lumpur. Wastegated with Tial 38MM 1 bar spring.

Guess what ? I'm still using the stock standard turbo manifold. Engine head port polish done by Nasty Port Flow in Subang with CFM tested. Jun 4G93T Turbo High Profile Billet cam fitted in - 272 Degree 10.85mm lift for both Intake and Exhaust together with Custom made adjustable cam pulley.

Intake system using back the standard 4G93T intake manifold but ported to bigger flow. The throttle body -From 4G92 Mivec bored to 65MM.



This time Sard 800cc injector fitted in again with Walbro 255LPH in tank fuel pump. This time I'm using the Haltech E6x standalone ECU with external 3 bar map sensor ( well I'm not using the stock map sensor built in with the ecu ) and Toyota 1JZ Air Temp sensor modified to my Intake system and 2.5" Exhaust piping with R*SR Invidia muffler

After the engine running in for few weeks ..After setting and tuning .Massive 316 WHP boosted at 1.9Bar , The turbo boost control by Blitz Dual SBC Spec R. I'm pushing it to the limit at the dyno machine and can't believed it !!!!! as this just 1600cc Engine !!!!!

I'm confident that my engine can withstand the power as the modification done on the engine block!!!! But too bad, the car was stolen on 5 January 2009 at my house :(

Here is some of the photo's and the full modification chart list



Engine Modification
Mitsubishi 4G92 Mivec 1.6Liter Block
Mitsubishi 4G93 N/A Cylinder Head (Port Polish Done By Nasty Port Flow Subang)
Mitsubishi 4G93T standard turbo manifold
Mitsubishi 4G93T Intake Manifold

Aftermarket Modification
Custom Engine Wiring
JUN 272 Degree Lift 10.85 Hi Cam ( SS Racing )
Custom Made Adjustable Cam pulley
Sard Fuel Regulator (SS Racing)
Sard 800cc Injectors (Bought 2nd hand at Zerotohundred.com)
Greddy Type RS Blow Off Valve ( Tomei Autoparts )
TD05 20G Journal Bearing Turbine by Tong Turbo
Stainless Steel Intercooler Piping by Chee Wah USJ Subang
2.5" Exhaust Piping by Chee Wah USJ Subang
R*SR Invidia Racing Muffler ( Tomei Autoparts Subang )
Aftermarket 65MM throttle Body
Exedy 9" 3 Puck Racing Clutch (SS Racing)
1.8MM Mitsubishi Metal Head Gasket (WiraTakLaju Zerotohundred.com)
Walbro 255LPH Fuel Pump (SS Racing)
Greddy Type RS Blow Off Valve ( Tomei Autoparts)
Mitsubishi Evolution 7 Intercooler ( Sponsored by one of my customer )
Mitsubishi Evolution Front Twin Pot Brake System (Tomei Autoparts)
Mitsubishi Evolution Rear Disk system (Tomei Autoparts)
Mitsubishi Evolution Master Brake Pump (Tomei Autoparts)
Mitsubishi Evolution III Semi LSD Gearbox (Tomei Autoparts)
Mitsubishi Evolution front Axle and Anti Roll Bar (Tomei Autoparts)
Mitsubishi Evolution III Dashboard (Tomei Autoparts)
Mitsubishi Evolution II Door Panel (Tomei Autoparts)
Mitsubishi Evolution II 6 Pieces Cromax Glass (Tomei Autoparts)

Engine Management and Computer System

Haltech E6X Standalone engine Management system
3Bar Map sensor from Haltech
Blitz Spec R Dual Solenoid Boost Controller ( Tomei Autoparts )

**Item bought from the shop as stated in the bracket**
** Car was stolen on 5 January 2009 in front of Union Height Condominium OUG**