Modding upgrading and tuning the Mitsubishi 6G7 engine!

All you need to know about "6G7 Modifications"

6G7 Modifications Guide

How to modify and upgrade the Mitsubishi 6G7

"Comprehensive guide to performance parts and tuning the Mitsubishi 6G7 engine!"

Our friends at TorqueCars are frequently seeing threads requesting info on how to improve the 6G7 from people inquiring about getting more power from the 6G7 and wanting to know what are the things tuners are recommending when it comes to 6G7 upgrades. So let us look into Mitsubishi 6G7 parts and outline the best upgrades on this great engine and point out some potential pitfalls along the way.

The Mitsubishi 6G7 are fantastic to work on and with the best sports upgrades like remapping, turbo upgrades and camshafts you will really maximise your driving enjoyment.

This pages aim is look at 6G7 tuning and point out the greatest modifications for your car.

Just because particular modifications are popular with 6G7 owners it doesn't mean its worth having, so we'll focus on the greatest modifications that will give your 6G7 the best power gain for you spend.

Without us subscribing to the popular myth of 'if it's shiny and makes more noise it must be good' you seem to get in many tuning magazines and on car forums'.

6G7 induction kits

Improving air intake on the 6G7

You need air and fuel for an engine to work. If there is not enough fuel then it will run lean, if there is a lack of air it runs rich sapping power and potentially damaging the engine. We'll pick up on fuelling later in this article but for now we shall look at air supply.

So the aim to any car tuning task to push air and fuel into each cylinder but this has a knock on effect with the air flow sensor.

You'll commonly see there is a limit in the air flow sensor MAP/MAF/AFM on the 6G7 when a lot more air is being drawn into the engine.

We note 4 bar air sensors coping with quite large power gains, whereas the OEM air sensor sapped bhp at a much lower level.

Headers flow the during the engines suck phase from the air filter and allow it to be sucked into the engine and mixed with fuel.

The shape and flow rate of the Air Intake manifolds can make a large improvement to fuel engine efficiency on the 6G7.

I usually find intake are improved through a performance upgrade, although some manufacturers provide decently flowing intake.

Adding a 6G7 larger valve kit, carrying out 6G7 port enlargement and head flowing will also lift bhp, & importantly will permit an improved bhp increase on other parts.

6G7 performance cam tips.

Some 6G7 engines respond better to less aggressive cam durations check your engine on a rolling road.

The ECU mapping and fuelling also have a large bearing on the power gains you'll get.

Altering valve durations can alter the power band and on most engines the exhaust and intake durations do not need to match, although most cams and tuners use matched pairs there are some advantages to extending the intake or exhaust durations.

Altering your 6G7 cam will make a dramatic difference to the engine bhp. Choosing a higher performance cam profile raises the bhp accordingly.

NB: Fast road camshafts normally push up the power across the rev band, you could drop a little low end power but the higher rpm power will improve.

Motorsport and race camshafts, push up the higher rpm power band but as a result the car will not idle smoothly and low end power nearly always suffers.

In a typical daily driver you need to optimize your engines power to your cars usage.

I would be surprised if you have ever thought a 6G7 Motorsport and race camshaft is a pleasure to live with when in heavy traffic.

Stage 1, 2 and 3 mods for the 6G7

Before we break the best tuning upgrades down into stages of tune, let's list the most effective tuning upgrades for you.

  1. Suspension Upgrades - always improve your cars handling
  2. Brake Upgrades - Even before adding power improve those brakes
  3. Intake - make sure the intake is not restricted, use filters and intake upgrades to improve this
  4. Exhaust - as with 3 ensure there is not restriction in the exhaust, cats are the usual bottleneck
  5. Tunes - remapping, piggyback ECU's and aftermarket ECU's can all make decent gains
  6. Fuelling - when you've increased power you'll need to match this with more fuel
  7. Turbo upgrades - Improving the intake with a large turbo and better flowing intercooler will be the biggest power gain you'll see (but one of the most complex).

This video guide to tuning cars is a great starting point to work from in your project.

Stage 1 6G7 parts:

Remaps/piggy back ECU, Sports exhaust manifold, Fast road camshaft, Panel air filters, Drilled & smoothed airbox, Intake headers.

Tuning tips and articles Engine tuning Transmission tuning Care care Intake & exhaust mods Improve handling Forums

Stage 2 6G7 parts:

Sports catalyst & performance exhaust, Fast road cam, high flow fuel injectors, fuel pump upgrades, induction kit, Ported and polished head.

Stage 3 6G7 parts:

Adding or Upgrading forced induction (turbo/supercharger), Engine balancing & blueprinting, Internal engine upgrades (head flowing porting/bigger valves), Competition cam, Crank and Piston upgrades to alter compression, Twin charging conversions.

The 6G7 units respond well to mods and we're happy to report there is a lot of upgrades and tuning parts about.

Remaps will help release the full potential of all the parts you've done to your 6G7.

You will typically expect to see gains of approximately 20-30% more power on turbocharged vehicles and you can expect to see around 15% on NASP engines, but the outcome usually vary depending on the parts you've fitted and the condition of your engine.

Turbo modifications on the 6G7

To get a turbo working on a NASP engine there is a lot involved, from lowering compression ratio to improved fuel supply and mapping, so we have found a great guide to helpavoid the common pitfalls or end up with an unfinished project because you were not told what you were getting into by doing this on the 6G7.

The more air you can get into an engine, the more fuel it can burn and uprating the induction with a turbocharger upgrade makes major power gains.

If an engine is fitted with a turbo tuning parts are giving better power gains and you'll see that turbocharged engines already contain better components.

However you'll find engines will have power limits

See where you'll find these limitations and fit better pistons and crank to cope with the power.

It's not unheard of mechanics spending a loads of money on turbocharger upgrades on the 6G7 only to suffer the indignity of watching the whole thing explode just after it's been completed.

Bigger turbochargers tend to suffer a bottom end lag, and low capacity turbochargers spool up quickly but do not have the peak rpm torque gains.

Thanks to progress the range of turbochargers is always moving on and we are seeing variable vane turbochargers, permitting the vane angle is altered according to speed to lower lag and increase top end bhp and torque.

Twin scroll turbochargers divert the exhaust gases into a couple of channels and feed these at differently profiled vanes in the turbocharger. They also boost the scavenging effect of the engine.

Beefing up the air intake by adding a supercharger or additional turbo will help you achieve very large bhp and torque gains, although more challenging to setup. We have this article on twincharging if you want to read more.

Tips about fuel supply on the 6G7

When you raise the performance you will need to ramp up to the fuelling.

More performance needs more fuel. Don't forget to be generous with your flow rate on the injectors.

As a rule of thumb add another 20% when buying an injector, which takes into account injector deterioration and gives some spare capacity should the engine require more fuel.

Don't forget that different fuel grades will usually require different settings, a high octane fuel will burn more efficiently than lower octane fuel for example. A car will trim fuel supply to keep within the ideal air fuel mix but at the extreme ends you may need to adjust your injector capacity, or the mapping or you'll get flat spots and potential lean or rich fuel issues..

Recommended 6G7 performance exhaust upgrades

You may need to boost your exhaust system with an upgraded one is if your current exhaust is creating a restriction in flow.

On most factory exhausts you should find that the flow rate is still ok even on modest power gains, but on a serious tuning project with a big boost in power you will certainly need to get a better flowing exhaust.

Sports exhausts can usually air flow from the engine but avoid an exhaust that is too wide or you could will reduce the flow rate. Stick to one and a half to two and half inches as a rule of thumb.

Typically exhaust restrictions can be traced to the emissions filters installed, so adding a faster flowing high performance alternative will help avoid this restriction.

Decat pipes (NB:catalysts reduce harmful engine emissions) is illegal in most countries and regions.

Faults issues and things to look out for on the 6G7

Like most engines an 6G7, should have few issues if it gets properly serviced and looked after.

We cannot stress enough the need for oil changes with the correct grade of oil on the 6G7, failure to do this will exacerbate engine wear, on a tuned 6G7 this is more important than ever and close attention should be paid to your maintenance schedule.

If you are interested in learning more or getting impartial tuning advice for your 6G7 why not pop over to the forums at TorqueCars where you can chat about 6G7 tuning options and read about others projects who may be planning to do similar modifications on their 6G7.

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