BMC CDA users

[Andy]

Evening all!

Anyone out there using a BMC CDA?

http://www.bmcairfilters.com/infoCDA.asp

[don kalmar union]

Coincidence!

I have been pondering fitting one to my S60 T5 that I race in the Britcar long distance series....particularly as a recent testing accident has damaged the standard airbox amongst a few other things.

Only a few weeks ago however we had the car on Power Engineering's rolling road, and with a little time to spare, we removed the standard air box and inlet tract and messed about with a few aftermarket offerings and no filter at all.

Surprisingly, there was virtually no change in anything....concluding that Volvo have made an excellant job of their stock design and that it was best to just fit an aftermarket panel filter of choise.


Don.Norchi.

www.kalmar-union.com

TME engineered software UK distributor.

[Andy]

Thanks Don. I've heard similar thoughts before from other people ;)

That was on the dyno with a fan, yes? On the road wouldn't it be a different story with better 'real' cooling?

[don kalmar union]

Andy,

Certainly PE do not have huge fans, for example on the scale of Owen Developements. But, for the very short runs we had made on a cold day with their two fans, I doubt that it would have effected things much.

However, whether with big fans or on the road, I think that to get the air in through a closed system like Volvo's standard or one of these CDA's fed through the same closed route will be, by far, better than an open cone filter in the engine compartment.

What I do like about these BMC things is the way you get a proper individual fixing to the maf, not some cobbled up bit of piping.


Don.Norchi.

www.kalmar-union.com

TME engineered software UK distributor.

I have made myself a new inlet pipe with 2.5inch samco, and 2.5 inch ally tube and noticed a marked improvement in spool up,the motor is far from standard but an improvement was made.It made a much bigger difference than the pannel filter which made no disernable difference to me.

[don kalmar union]

Interesting point there Elliot.

The last 90 degree turn into the turbo has been designed and maintained to date by Volvo as a restriction to the airflow. If you look closely you will see that there is quite a throat there. If you replace it by a combination of 'samco' bend and ally pipe with the breather solenoid and sensors araldited in you will make an appreciable gain. I have been looking into making up a kit to sell for this very purpose.

Whilst in that area you can do away with the standard crankcase breather system if you take the standard catch tank off and circulate the crankcase and head breathing through an aftermarket catch tank/separator with return to the sump. This is really a great improvement if you are into giving the engine prolonged stick causing some extra crankcase compression. I can send you pictures of that setup on both my S70 and S60 if you are interested.

Don.Norchi.

www.kalmar-union.com

TME engineered software UK distributor.

i have done away with the breather back into the intake,blocked the vac feed that helps the crank case gasses out under vac, but causes a boost loop under boost,i blocked it at the inlet manifold by the power steering pump ,and as far as i am aware all the sensor does that sits in the inlet tract is heat the crankcase cases to stop the oil condensing,so i removed that to.So i just have 2 90 degree bends and a bit of 2.5 inch ally tube.I would say it is worth doing,i will try and come to the next meet,i want to show off my new rims to lol they only weigh 6kgs hehe

[don kalmar union]

I have been told that the oil mist that gets into the turbo in fact does it no good at all. I would however be carefull if, as I understand, you have blocked off the breathing. It can cause the engine to blow out a fair bit from the dip stick pipe.

Don.Norchi.

www.kalmar-union.com

TME engineered software UK distributor.

its ok i have'nt blocked my breather system lol it is venting to air at the moment and is collecting the oil in a can.I have just blocked the vac feed that runs from the inlet manifold to the sensor that sits in the inlet tract,and removed the sensor/heater