PRO-STREET 4cyl DCOE throttle body kit 40mm - 52mm

BOOSTED VS NATURALLY ASPIRATED:

We have lip seals behind the throttle shaft bearings to stop grease from being sucked out of the bearings under high intake runner vacuum. These are turned around on boosted applications so there is no boost leakage and also stops the bearing grease getting evacuated from the throttle shaft the bearings. 

We ask you if you are going to run your engine Boosted, or Naturally Aspirated so we can install the Lip Seals in your throttle bodies in the appropriate way to suit your application.

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FULLY ASSEMBLED VS SUB ASSEMBLED KIT:

We want to supply your Throttle Body Kit just the way you want it.

That's why we offer both Sub Assembled Kits, and Full Assembled Kits.

FULLY ASSEMBLED KIT:

By choosing the Fully Assembled Option above, you will receive:

- Each of your Throttle Bodies is precision factory assembled

- Throttle Shafts cut to correct lengths to suit your manifold

- Linkages are fitted and adjusted to ensure correct and smooth operation

  Note: Although we will supply a great linkage fitment, final linkage adjustment

  can only be carried out once the engine is running

- TPS "D" drive on the end of the shaft you stipulate so it's in the best position on your engine

- We may contact you with a few questions to ensure we supply the kit assembled to best

  suit your application

SUB ASSEMBLED KIT:

By choosing the Sub Assembled Option above, you will receive:

- Each of your Throttle Bodies is precision factory assembled

- Throttle Shafts are left long so you can trim them to suit your engine and manifold

- Linkages are supplied for you to fit and adjust once you have trimmed your Throttle Shafts

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• (Manifold and Fuel Rail Fittings are not included) P.O.A. for these items

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LINKAGE AND RAM TUBE COLOURS:

Due to overwhelming demand from our customers, we are transitioning our standard colour from Blue to Black.  Black is a classic colour, and goes with pretty much every engine bay colour and style.

This includes Ram Tubes, Linkages, Cable Pulleys, Drop Links, Bell Cranks, and more.

Don't worry if you love blue, you can still get your kit in blue.  There will be a small premium of $40 per kit to cover us sending out your kit of parts to be anodized blue.  If you would like blue anodizing, please let us know by typing in the notes area of your order.

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QUALITY ASSURANCE:

Every single throttle bore and throttle plate are measured and matched as a pair to ensure the most perfect throttle fit and consistency across every EFI Hardware throttle body.

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THROTTLE BODY TECHNICAL DRAWING

HP RATINGS

HP/kW Ratings vary from engine to engine.  The power ratings given here are only a guide, and are not absolute power ratings.  Engine power is determined by intake, exhaust, cylinder head design, camshaft design, compression ratio, fuel type and quality and many other factors.

40mm - 45HP/34KW* per throttle.

45mm - 54HP/40KW* per throttle.

*This number is a guide only and should be used in conjunction with real-world experience.

BUILT FOR THE STREET

For improved engine idle quality, these throttle bodies are supplied with individual adjustable Idle Bleed Screws for each throttle allowing you to balance the air flow to each cylinder at idle.

HIGH PERFORMANCE FUEL SYSTEM PLUMBING TECHNICAL DIAGRAM

Setting up your fuel system right the first time is easy if you follow the right instructions.

EFI Hardware produce 6° Throttle Plates.

In the past, 12° throttle plates were the industry standard.  The problem with 12° throttle plates, is that as the plates are moved off the closed position, the change in airflow is huge.  It makes it very difficult to drive smoothly at lower throttle openings.

At EFI Hardware, we only use 6° throttle plates.  This improves off idle and cruise driveability making your vehicle far more enjoyable to drive.

PROFESSIONAL GRADE MANUFACTURE

Manufactured from 601 Cast aluminum and heat treated before being CNC machined.

The butterflies are measured for each bore & precision machined to a 0.0005"" tolerance.

Butterflies are secured to centreless ground brass shafts with split screws to ensure reliability and serviceability.

All are fitted with bearings rather than bushes to eliminate axial shaft movement.

Low stiction bearings for sharp throttle response.

GETTING THE RIGHT BALANCE:

The best idle and cruise quality will only occur when every throttle has exactly the same airflow.

The only way to achieve this is to adjust the linkages and/or idle bypass screws and use a tool to measure the airflow at each throttle.

Getting the right balance is not a should, it is a MUST.

We now recommend

and use SKF bearings.