ZZPerformance’s Cadillac ATS & Camaro LTG 2.0 Upgrade Guide – From Maintenance to Maximum Power

Feb 21

The GM LTG 2.0L turbocharged four-cylinder—found in the Cadillac ATS and Chevrolet Camaro—offers a unique blend of efficiency and performance potential. But like any modern direct-injection turbo engine, unlocking its full capability means following a smart, staged approach.

According to ZZPerformance, the first step isn’t adding boost or bolting on shiny parts—it’s ensuring the car is mechanically sound. The LTG is a precision engine with one notable limitation: the factory rods and pistons. They can reliably handle about 350–380 wheel horsepower, but early 2013–2014 ATS models have been known to drop pistons sooner. The stock block and crankshaft, however, have proven strong well beyond 650 whp without a known failure point.

Start With the Basics – Maintenance First

Before adding power, make sure you’ve got the right foundation:

Oil: Run a high-quality, low-ash oil like Mobil 1 ESP Formula to minimize knock retard (KR) and prevent hot spots.
Spark Plugs: Denso or NGK plugs (cooler heat range than stock) are highly recommended to resist detonation.

Plan Your Build Path

ZZPerformance stresses the importance of planning. A clear end goal prevents wasting money on parts that will be replaced later.

Recommended Upgrade Sequence

1. PCM Tune

The ultimate first mod—adjusting boost, air/fuel ratio, spark timing, valve timing, and shift characteristics. Gains of ~40 hp are typical.

2017+ automatics require a TCM unlock for full transmission tuning.
ZZP offers low-cost re-flashes when adding future mods.

2. Flex Fuel Conversion Kit

If E85 is available locally, it’s a game-changer: higher octane, cooler combustion, and more knock resistance.

3. Intake System

Two approaches:

Silicone intake tube + K&N drop-in filter (retains factory airbox).
Full Cold Air Intake for maximum flow and turbo sound.

4. Downpipe

A high-flow unit drops weight, reduces backpressure, and works with stock or upgraded turbos.

5. Catch Can

Prevents oil vapor from entering the intake system, reducing detonation risk.

6. Intercooler Upgrade

Moves the heat exchanger to a front-mounted position for better airflow and cooler charge temps, replacing the stock heat-soaked location.

Beyond the Safe Zone – Forging the Bottom End

Once you approach 350–380 whp, it’s time to address the LTG’s weak link.

Forged Rods & Pistons: Necessary for big-turbo or full E85 builds.
Stock crankshaft and block are more than capable for extreme power levels.

High-Power Mods

Turbo Upgrades:

ZFR Turbo – BorgWarner EFR 6758 with custom hot side: +50–75 hp over stock, near-stock spool.
Big Wheel Turbo – Larger billet compressor wheel, +15 hp over stock.

Cams & Valve Springs:

Titanium-retained, high-pressure springs keep valve control at high boost/RPM.
Aftermarket cams add lift/duration and increase HPFP capacity for more fuel delivery.

Supporting Performance & Handling Mods

Cat-Back Exhaust: Frees up exhaust flow and adds sound.
Larger Throttle Body: Improves airflow and response.
Chassis Bracing & Sway Bars: Sharpen cornering and reduce body roll.
BC Racing Coilovers: Fully adjustable ride height and damping.
Upgraded Trailing Arms: Stronger construction with polyurethane bushings for improved stability.
Brake Upgrades: From OEM+ pads/rotors to full big brake kits for track-level stopping power.

Final Take

The LTG 2.0 platform in the ATS and Camaro can be transformed into a seriously quick street or track car—if built with reliability in mind. ZZPerformance’s methodical approach starts with maintenance, then adds carefully chosen upgrades to match your goals. And when the time comes to push past the 380 whp barrier, forged internals open the door to 500+ wheel horsepower without risking the bottom end.

LTG Motorworks .