Fitting & Tuning Instructions CB-26P

Actual fitting pictures for your car here

cb26pFIT2_smallThe same Ecotek CB-26P fits almost all petrol engine cars and uses the vacuum created in the inlet manifold to cause turbulence in the fuel air mixture.

It needs to be fitted so that it can allow small quantities of turbulent air into the manifold. This is accomplished by fitting it to a breather hose from the plenum chamber or the manifold or to the vacuum servo hose from the brake servo.

Follow these instructions carefully. If attaching to the brake servo make sure there are no air leaks as incorrect fitting/tuning can result in loss of power assistance to the braking system which is potentially dangerous.

If you are in doubt about this consult a qualified mechanic and/or the manufacturers service manual – we have qualified fitters throughout the Country and these are listed on the Suppliers page.

If the car has a cubic capacity of more than 2.6 litres two devices must be fitted in series and the one furthest from the inlet manifold tuned first.

1. Firstly, check that the body of the device – metal, is tight to the “T” piece – plastic, (tighten with a 19 mm spanner).

2. Then locate a suitable vacuum servo/breather hose to the inlet manifold – see the diagrams above.

fittin1[1]_smallHere is a picture with the various components marked which will help some of you with locating the relevant parts and hoses in your engine – if it’s too small to see properly simply click on the picture for an enlarged version.

On this site there are pictures of the device fitted to a number of cars – see also the illustrated Topbuzz fitting instructions by clicking here

On the Cars & Fitting page an expanded picture in PDF format can be obtained by clicking on the picture there are more than a hundred cars illustrated – don’t worry if yours isn’t listed the device fits almost all conventional petrol engines – if you want to be sure then email us. Also visit the Forum for more information.

(If you have no conventional inlet manifold access you will need to tap a manifold core or blanking plug or the manifold itself with a 1/4? BSPT thread).

VWfit1The servo hose is most normally found by locating the brake servo drum and then the hose that leads either to the carburettor or (in the case of petrol injection) directly to the manifold (or Plenum Chamber) – as shown above on the annotated diagram or by this Golf GTi Turbo.


Alternatively, any hose that draws a vacuum from the centre of the inlet manifold will also be suitable provided it is large enough (internal diameter of more than 4mm), such as a crankcase breather (PCV), indeed this should be checked first as a preferred option.

jagfit23. Check hose for cracks or leaks – clean or replace as necessary. Cut the hose (using a sharp blade) as close as practical to the manifold (no closer than 3 cm) and ideally no more than 30 cm away but always inside (engine side of) any non-return valve (if fitted).

Some cars are fitted with narrow gauge servo hose – this needs to be sleeved over with 10 mm fuel/emission hose and four 14 mm jubilee clips (a 2 inch length on each side of the “T” piece will then slide over the severed servo hose) such as the Jag S type on the left.

4. For standard hose insert each end of the CB-26P nylon “T” piece in each of the severed hose ends and secure with jubilee clips or equivalent. This effectively rejoins the hose with the CB-26P in place – an airtight fit is essential and jubilee type clips are strongly recommended.

The device is now ready for tuning.


The video below shows you how to tune the device.

alfa147fit1. Screw the locking ring towards the nylon “T” piece as far as it will go.

2. Screw the cap containing the filter in the same direction (ie: clockwise looking at the filter) as far as it will go WITHOUT TIGHTENING.

The unit is now locked off and you are ready to start the engine. This Alfa 147 is easy to fit, with the crankcase breather fitting directly into the centre of the plenum chamber.

3. Start engine and allow it to reach operating temperature and tick over revs without choke.

4. At operating temperature gently unscrew (turn anti-clockwise) the CB-26P filter housing until you feel the unit vibrate, this should be accompanied by a LOUD induction noise. Close the unit (turn clockwise) until this noise stops.

Repeat step 4. until you are certain you have reached the point that the unit starts to operate (where the noise stops/starts) and then turn the filter housing clockwise through 90 (i.e.: by closing the filter housing one quarter turn from the point the rasping noise stops) and then lock it off at this point . With two units (for larger engines over 2.6Litres) tune each unit separately starting with the one furthest from the manifold.

cb26pFIT1_smallOn some modern engines, 2004/2005 onwards, the engines electronics can be so sensitive that the ECU warning light on the dashboard may illuminate after the Ecotek is fitted. If this is the case, simply re-tune the Ecotek adding 1/2 turn clockwise from the point the rasping noise stops rather than the normal 1/4 turn. After a few miles the warning light will go out . Adding the extra 1/4 turn to the tuning process simply lets the Ecotek to start to operate at slightly higher revs when the electronics are less sensitive to the small amount of additional air entering the inlet manifold to improve the combustion process.

Essentially therefore, tuning the CB-26P involves the following 3 steps (if in doubt watch the videos above):

1. Close the valve (turn fully clockwise), warm up the engine and, with the engine at tick-over, unscrew the filter housing until the device makes a loud and harsh rasping noise and close it to just the point the noise stops.

2. Be sure you are precisely at the point that the noise stops and then close the unit (clockwise) a quarter turn (90 ) from that point and lock it there.

3. To lock the unit bring up the locking ring (anti-clockwise looking at the filter) to lock the filter housing at the point reached at the end of the step 2. (ie: 90 closed from the point the CB-26P starts to operate) and tighten the locking ring.

To test the unit is working properly, rev the engine and listen to the engine from inside the engine bay as the revs subside. The unit should make the same loud induction noise on overrun which will die away as the engine resumes idle.


It may sometimes be necessary to re-tune the device after a short while as it beds in and may need readjustment.

In addition the device will not be completely air-tight when locked-off

and will bleed very slightly at tick over, this is entirely normal.

Full Independent Test Data and Motoring Press Tests and Reviews plus a full independent consumer survey CLICK HERE for a 10 meg 76 page pdf.