Level: Hard, requires knowledge about engines and ability to manufacture parts.

400-500 horsepowers gets close to the limits of this engine but is still possible to get reliable (Our race engine is about 800hp). However to get it reliable we recommend quite a lot of improvements. You will have to modify the internal mechanical parts, turbo, pressure pipes, fuel system, engine management and cooling system.

Parts that need to be replaced

Turbocharging system

Turbo

Compressor inducer on 320cdi need to be around 56-60mm on that power range. Exhaust side is good to be slightly bigger. Turbinehousing is the thing when playing with spool up. In daily driving 10-12 (ar 0.82), and in racing use its good to be closer 16(ar 1). Compound is different thing.

What we have to offer is Custom manifold and billett hx35 (up to 450hp)

Pipes & Intercooler

Aluminium pressure pipes all the way from turbo to intake. The biggest intercooler you are able to fit. We recommend weldable quick couplings for the pipes (Vibrants or similar).

Fuel system

A stock 400 CDI high pressure pump will be able to deliver up to 450 hp. If you want more you can fit the pump with our custom pump gear. You also need to fit the pump with a stronger pump coupling. If you don’t use a transfer pump the fuel lines needs to have an inner diameter of at least 12mm. You will also need improved injectors we recommend our street injectors.

When updating to the 400cdi pump, there is no place for the stock temperature sensor which is attached to the stock pump. Easiest solution for this is to just leave the sensor attached to cable and move it somewhere else in the engine bay. This way you don’t need any modifications on the map. The fuel temperature has extremely minor influence on the map.

Engine

Internals

In case you want rev engine more than 5100rpm, we recommend stronger h-profile connection rods with ARP bolts. Common std bearings is fine.

To improve the torque and general characteristics of the engine we strongly suggest our custom camshafts.

We also strongly recommend our girdle plate and ARP bolts to stabilise the block. These things are pretty important on higher engine revs, daily driver can survive without on that power range.

With stock rods and stock bolts up to 5100rpm

With stock rods and arp bolts 151-6004 up to 5500rpm

With our rods and ARP bolts up to 6500rpm

Cooling system

We recommend to improve the engines cooling as much as possible. Radiatos size and cooling fans is key for that.

Engine management

You will need a highly customised engine map. In case engine is swapped, we recomend to use a EDC16, EDC15.

When you purchase injectors from us, every set is individually measured. These measurements should be taken into account when you make software, you can choose to buy the software for you car for a reduced price when you order your injectors. For 300-400hp you also need to get a 4-bar map censor. This sensor is plug-and-play so no hassle there.

Drivetrain

At these powers we also reach the limits of the standard drivetrains generally. These suggestions of-course is dependent on your car and your driving style. If you use a 722.6 gearbox we recommend you get it strengthened. We can offer gearbox tune for egs52 controlled gearboxes.