maXpeedingrods GT35 T3 Turbo Kit with 27-Inch Intercooler and Oil Lines

Turbocharger Specifications

GT35 Compressor and Turbine Sizing

The 61.5 mm compressor inducer and 0.70 A/R housing provide airflow for higher-output street and competition engines. The 0.63 A/R turbine housing is intended to balance response with exhaust-flow capacity.

Actual performance depends on:

• Engine displacement
• Engine speed
• Compression ratio
• Exhaust-manifold design
• Boost target
• Fuel type
• Camshaft specifications
• Exhaust restriction
• Vehicle weight and gearing

A turbo that works well on a high-rpm 3.0L engine may behave very differently on a larger, lower-rpm application.

Garrett recommends matching a turbo using target horsepower, displacement, pressure ratio and airflow rather than choosing by engine size alone. Garrett Motion

27 × 7 × 2.5-Inch Intercooler

The included front-mount intercooler is approximately:

• Overall size: 27 × 7 × 2.5 inches
• Core size: 21 × 7 × 2.5 inches
• Inlet and outlet: 2.5 inches

The intercooler reduces compressed-air temperature before the air enters the engine. Lower intake temperature can improve air density, reduce knock tendency and provide more consistent power.

Before purchase, measure:

• Available bumper width
• Crash-beam clearance
• Radiator airflow
• Air-conditioning condenser clearance
• Charge-pipe routing
• Hood-latch and bumper-support locations

Cutting, drilling or bracket fabrication may be required.

Package Contents

Depending on the selected package and the components shown in the primary product image, the kit may include:

• GT35/GT3582-style turbocharger
• 27-inch front-mount intercooler
• Oil-feed line
• Oil-return line
• External wastegate
• Blow-off valve
• Blow-off-valve adapter pipe
• Turbo heat blanket
• Monitoring gauge or tachometer components

Confirm the included parts before ordering. Universal kits frequently require additional couplers, clamps, fittings and hardware once the engine bay begins expressing its opinions.

Components Still Required

This kit does not complete a turbo conversion by itself. Most installations also need:

• Engine-specific T3 turbo manifold
• Wastegate dump tube
• Custom three-inch downpipe
• Intercooler charge piping
• Silicone couplers
• T-bolt clamps
• Air intake and filter
• Oil-pan return fitting
• Coolant hoses and fittings
• Larger fuel injectors
• Higher-capacity fuel pump
• Boost-control system
• Wideband oxygen sensor
• MAP or boost-pressure sensor
• ECU calibration
• Exhaust-system modifications
• Heat shielding

External Wastegate Requirements

The turbocharger housing does not provide universal internal-wastegate control, so a compatible external wastegate and manifold port are required.

Wastegate selection should account for:

• Engine displacement
• Exhaust flow
• Minimum boost target
• Manifold pressure
• Wastegate port placement
• Spring pressure
• Dump-tube routing

A poorly positioned or undersized wastegate may cause boost creep or overboost.

Oil-Feed and Return Installation

The included oil-line hardware must be adapted to the engine.

The oil return must:

• Flow continuously downhill
• Enter the oil pan above the normal oil level
• Avoid tight bends and kinks
• Remain clear of exhaust heat
• Have sufficient internal diameter
• Avoid crankcase-pressure restrictions

Garrett recommends approximately a -4AN feed for many journal-bearing turbo systems, but oil pressure must be measured and matched to the requirements of this exact turbocharger. Garrett Motion

Water-Cooling Requirements

The turbocharger uses M14 × 1.5 coolant ports. Both coolant connections should be used unless the manufacturer specifically states otherwise.

Proper routing helps control bearing-housing temperature and reduce oil coking after shutdown. Coolant lines should avoid trapped air, sharp bends and direct contact with hot exhaust components.

Garrett notes that water cooling continues drawing heat away from the center housing after shutdown through thermal siphoning. Garrett Motion

Realistic Power Expectations

The product should not be assigned a guaranteed horsepower increase without a published compressor map and complete engine specification.

Actual output depends on:

• Compressor airflow
• Boost pressure
• Engine volumetric efficiency
• Fuel type
• Injector size
• Fuel-pump capacity
• Intercooler efficiency
• Ignition timing
• Exhaust backpressure
• ECU calibration

The turbocharger may support a substantial power increase on a properly built combination, but the engine’s internal components determine how much power it can survive.

Check Engine Health Before Adding Boost

Before installation, perform:

• Compression testing
• Cylinder leak-down testing
• Oil-pressure testing
• Cooling-system inspection
• Fuel-pressure testing
• Ignition-system inspection
• Crankcase-ventilation inspection
• Timing-system inspection

Review Pro Street’s engine-health checklist for turbo builds before installing the kit.

A larger turbo does not repair weak piston rings. It simply delivers the final diagnosis with more enthusiasm.

Installation and Initial Startup

Professional fabrication and dyno tuning are strongly recommended.

Before startup:

1. Verify that the turbo wheels rotate freely.
2. Clean every oil line and charge pipe.
3. Install the oil return above the oil level.
4. Connect and bleed the coolant circuit.
5. Prime the turbo with clean engine oil.
6. Crank the engine without starting until oil pressure develops.
7. Pressure-test the intercooler and charge piping.
8. Verify wastegate plumbing and spring pressure.
9. Confirm sufficient fuel pressure.
10. Begin tuning at minimum boost.
11. Monitor air/fuel ratio, boost and oil pressure.
12. Recheck every fitting after the first heat cycle.

Emissions Notice

This kit modifies the factory intake, exhaust, fuel and engine-management systems. No CARB Executive Order number is supplied.

Verify applicable emissions and vehicle-modification laws before installation. In regulated areas, this kit may be limited to off-road or competition use.