Modding upgrading and tuning the VAG 3.6 VR6 engine!

Tuners tips on "3.6 VR6 Modifications"

3.6 VR6 Modifications Guide

How to modify and upgrade the VAG 3.6 VR6

"Comprehensive guide to performance parts and tuning the VAG 3.6 VR6 engine!"

Forums like the one at TorqueCars are frequently getting posts asking how to improve the 3.6 VR6 from people wanting to know what are the best 3.6 VR6 upgrades. So let us look into VAG 3.6 VR6 parts and outline the best mods that work on this great engine and point out some common pitfalls along the way.

Let us examine the options for your 3.6 VR6 tuning and highlight the greatest upgrades. VAG 3.6 VR6 make a good tuning project and with carefully picked motorsport enhancements like ECU maps, turbo upgrades and camshafts you will noticeably maximise your driving pleasure.

The greatest 3.6 VR6 tuning mods on an engine are sensibly the ones that give the best power gain for your hard earned cash.

We won't be swayed by popular 3.6 VR6 tuning mods, they need to be cost effective.

3.6 VR6 induction kits

Improving air intake on the 3.6 VR6

You need air matched to fuel for an engine to work. If there is not enough fuel then it will run lean, if there is little flow of air it runs rich losing power which risks damage to the 3.6 VR6. We'll pick up on fuelling later in this article but for now we shall look at air supply.

So Pushing air into your 3.6 VR6 is the whole point to any engine performance tuning task.

It is common that there's a limitation in the air flow sensor AFM/MAF on the 3.6 VR6 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 limited bhp at a much lower level.

Intake manifolds take the during the engines suck phase from the filter and allow it to be fed into the engine cylinders.

The bore size, shape and flow characteristics of the Air Intake manifolds can make a noticeable change to fuel delivery on the 3.6 VR6.

I usually find intake are ripe for a performance upgrade, although a few makers provide well optimised intake.

Increasing the 3.6 VR6 valve size, getting port matching and head flowing will also lift bhp, and significantly will permit raising the bhp increase on other mods.

3.6 VR6 performance cam tips.

Each engine responds better to more aggressive cam durations than others.

The engine timing and fuelling also will say much on the bhp gains you'll get.

A longer valve duration can alter the bhp 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.

Significant air intake, and exhaust improvements on the 3.6 VR6 can be made from camshaft upgrades. Changing the camshaft profile alters the intake and exhaust durations on the engine and can dramatically change the bhp and power output.

NB: Fast road camshafts usually bump the power throughout the rpm range, you may sacrifice a little low down power but your top end will be better.

Competition camshafts, bump the top end band but as a result the car will not idle smoothly and low end power nearly always suffers.

On a typical daily driver you must carefully try to optimize your torque band to your driving style.

I'd never find a 3.6 VR6 Motorsport camshaft is a pleasure to live with when driving around busy urban areas.

Stage 1, 2 and 3 mods for the 3.6 VR6

Stage 1 3.6 VR6 parts:

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

Stage 2 3.6 VR6 parts:

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

Stage 3 3.6 VR6 parts:

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

Plan your options and then acquire your tuning parts and set yourself a power target to avoid costly mistakes.

Remapping allows a tuner to release the full potential of all the modifications you've done to your 3.6 VR6.

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

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 your mileage usually vary depending on the modifications you've fitted and the condition of your engine.

Turbo modifications on the 3.6 VR6

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 3.6 VR6.

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

When your car has a turbocharger tuning parts are more reliable and you'll see that turbo engines already contain many forged and stronger components.

However engines will need better parts at higher power limits

Research these limitations and upgrade to higher quality crank and pistons to handle the power.

We see many tuners spending a loads on turbo upgrades on the 3.6 VR6 only to experience the car go up in smoke just after it's first rolling road session.

Large turbo units commonly suffer a bottom end lag, and small turbo units spool up quickly but don't have the top end torque gains.

In the last 10 years the selection of turbochargers is always moving on and we now see variable vane turbochargers, permitting the vane angle is altered according to speed to lower lag and increase top end performance.

Twin scroll turbochargers divert the exhaust gases into a couple of channels and push these at differently angled vanes in the turbo. They also increase the scavenging effect of the engine.

Beefing up the air intake by adding a supercharger or additional turbo will help you achieve very large performance gains, although harder to install. We have this in depth look at twinchargers if you want to read more.

Tips about fuel supply on the 3.6 VR6

When you improve the bhp and torque you will need to pay attention to to the fuel delivery.

More bhp and torque needs more fuel. We strongly recommend you to be generous with your injector capacity.

The accepted safe increase is to add 15% capacity when buying an injector, this accounts for injector deterioration and allows a bit of spare capacity should the engine need 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 3.6 VR6 performance exhaust upgrades

The only time you should look to replace your exhaust system with an upgraded one is if the existing exhaust is actually creating a restriction.

On most factory exhausts you should find that your flow rate is 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 equal out the flow of gases through the engine.

But if the exhaust is too large, ie: it's over two and a half inches diameter, you will lose a lot of the flow rate and end up lacking power and torque.

Typically exhaust restrictions can be located the filters installed, so adding a higher flowing performance alternative will help avoid this restriction.

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

Faults issues and things to look out for on the 3.6 VR6

Like most engines an 3.6 VR6, 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 3.6 VR6, failure to do this will exacerbate engine wear, on a tuned 3.6 VR6 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 3.6 VR6 why not pop over to the forums at TorqueCars where you can chat about 3.6 VR6 tuning options and read about others projects who may be planning to do similar modifications on their 3.6 VR6.

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