Tuning the Chrysler 6.2 Hellcat Hemi

"Comprehensive guide to tuning and performance parts on the Chrysler 6.2 Hellcat Hemi engine!"

We are regularly getting messages about the optimum 6.2 Hellcat Hemi modifications. So let us look into Chrysler 6.2 Hellcat Hemi upgrades and outline the best mods that work on this great engine and point out some common pitfalls along the way.

Let us outline options for your 6.2 Hellcat Hemi tuning and point out the ultimate modifications for your car. Chrysler 6.2 Hellcat Hemi are good project engines and with carefully picked uprated mods like ECU maps, turbo improvements and camshafts you will certainly improve your driving fun.

The top 6.2 Hellcat Hemi parts on an engine are obviously the ones that give the biggest return for your cash.

We won't be swayed by popular 6.2 Hellcat Hemi parts, they need to be cost effective.

Altering your 6.2 Hellcat Hemi camshaft will make a dramatic difference to the engine torque. Choosing a higher performance camshaft profile raises the torque accordingly.

NB: Fast road camshafts normally raise the bhp and torque through the rev range, you could drop a little low end power but the top end will improve.

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

A Competition cam won't do well if in heavy traffic.

You should ideally match your power band to your driving style so for a road car stick with a mild fast road 6.2 Hellcat Hemi cam

Some 6.2 Hellcat Hemi engines respond better to different camshaft durations so view each engine as unique.

The ecu map and fuel pump and injectors also have an effect on the power gains you'll make.

Longer 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.

6.2 Hellcat Hemi Tuning Stages

Stage 1 6.2 Hellcat Hemi modifications: Drilled & smoothed airbox, Fast road camshaft, Intake headers, Sports exhaust manifold, Panel air filters, Remaps/piggy back ECU.

Stage 2 6.2 Hellcat Hemi modifications: Sports catalyst & performance exhaust, high flow fuel injectors, Ported and polished head, fuel pump upgrades, induction kit, Fast road cam.

Stage 3 6.2 Hellcat Hemi modifications: Competition cam, Internal engine upgrades (head flowing porting/bigger valves), Adding or Upgrading forced induction (turbo/supercharger), Crank and Piston upgrades to alter compression, Twin charging conversions, Engine balancing & blueprinting.

The 6.2 Hellcat Hemi power trains respond well to upgrades and thankfully there is a growing number of modifications and performance parts out there.

ECU mapping allows a tuner to fully realize the full potential of all the mods you've done to your 6.2 Hellcat Hemi.

It will usually give around 30% more power on turbocharged vehicles and you can expect to see around 15% on NASP engines, but power output usually differs on the mods you've fitted and the condition of your engine.

It is the main goal to any performance tuning task to force air and fuel into your 6.2 Hellcat Hemi

Air Intake manifolds take the air from the filter and allow it to be pulled into the engine and mixed with fuel.

Shape and flow rate of the Intake manifold can make a noticeable improvement to fuel engine efficiency on the 6.2 Hellcat Hemi.

Many mass produced engine intake manifold are needing performance upgrades, although some manufacturers provide reasonably well designed intake manifold.

Fitting big valve kits, getting port work and head flowing will also lift power, and importantly will give you a better power increase on other parts.

Turbo upgrades for the 6.2 Hellcat Hemi

NASP engines need quite a lot of work when you add a turbo, so we have a separate guide to help you take into account the pros and cons of going this route on your 6.2 Hellcat Hemi

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

If a car is fitted with a turbocharger tuning parts are going to net you a larger power gain and turbo charged engines are made using more solid components.

However engines have weakspots

We recommend you find these limitations and fit higher quality components to survive the power.

There are many guys spending a fortune on turbocharger upgrades on the 6.2 Hellcat Hemi only to suffer the indignity of watching the car explode when it's been completed.

Larger capacity turbo units often experience a bottom end lag, and small turbo units spool up quickly but won't have the peak end bhp gains.

Thanks to progress the choice of turbos is always evolving and we now see variable vane turbos, allowing the vane profile is altered according to speed to lower lag and increase top end bhp and torque.

Twin scroll turbos divert the exhaust gases into 2 channels and push these at differently profiled vanes in the turbo. They also improve the scavenging effect of the engine.

It is not unusual that there's a limit in the air flow sensor AFM/MAP on the 6.2 Hellcat Hemi when considerably more air is being drawn into the engine.

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

Adding a supercharger or additional turbo will make large torque gains, although harder to get working. We have this guide to twinchargers if you want to read more.

Uprating 6.2 Hellcat Hemi fuel injectors

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

More performance needs more fuel. Most tuners we speak with say to be generous with your injector capacity.

The accepted safe increase is to add 20% capacity when buying an injector, this takes into account injector deterioration and affords some spare capacity should the engine require more fuel.

We think this one is common sense, but you'll need to match your fuel injector to the type of fuel your car uses as well.

Best 6.2 Hellcat Hemi performance exhausts

You should look to uprate your exhaust if your current exhaust is actually creating a restriction in flow.

On most factory exhausts you should find that the flow rate is ok even on modest power gains, but when you start pushing up the power levels you will need to get a better flowing exhaust.

Do not go with the largest exhaust you can find this will reduce the exhaust flow rate - the best for power gains are usually between 1.5 to 2.5 inches. It is the shape and material more than the bore size.

Usual exhaust restrictions come around the catalysts installed, so adding a better flowing sports alternative will help avoid this restriction.

Specs, applications and bhp lbft Hemi 6.2

This was a twin screw supercharged Hemi and shares much with the 5.7 Hemi it is based on.

  • 707 bhp (717 PS) @6,000 rpm 650 lbft (881 Nm) @4,000 rpm

The Hellcat 6.2 was used in...

  • 2015–Present Dodge Challenger SRT Hellcat
  • 2015–Present Dodge Charger SRT Hellcat
  • 2018–present Jeep Grand Cherokee Trackhawk
  • 2018–present Hellcat Crate Engine
  • 2021 Dodge Durango SRT Hellcat
  • 2021 Ram 1500 TRX

Problems and issues to look out for on the 6.2 Hellcat Hemi

The 6.2 Hellcat Hemi engines, if regularly serviced and maintained, are generally very reliable and have few issues.

Regular oil changes are vital on the 6.2 Hellcat Hemi, particularly when the engine has been modified and is putting down more power than the manufacturer intended.

For more information on Tuning your 6.2 Hellcat Hemi engine please join us in our friendly forum where you can discuss tuning options in more detail with our 6.2 Hellcat Hemi owners. It would also be worth reading our unbiased tuning articles to get a full grasp of the benefits and drawbacks of each modification.

We need your help to complete and improve this page, so do give us your feedback in the comments box below.

We really like hearing from our readers, and hearing about which tuning parts were the most effective for them, it helps us improve our recommendations and articles to reflect current trends in modifications and ensures that our 6.2 Hellcat Hemi guides and tips are kept up to date.

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