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Cold Air Feed Induction Kits K&N Type

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Old Nov 6th, 2019, 16:46   #11
SwissXC90
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Quote:
Originally Posted by 827Roverman View Post
Anybody got any help or advice on these kits, I'm toying with the idea of fitting one to my 940 2.3ti, I believe you have to remove the existing air box and filter, then fit the kit which is supposed to give a better air flow-improve performance (not that I'm bothered about that, its fast enough for me has is) but I understand they also improve on MPG, I've seen some of these kits on ebay for about £50, any advice would be most welcome.
You can improve your MPG to a cost of 50 GBP saved by NOT buying the kit

They're made of snake oil.... there's enough scientific tests out there to show they make no difference....
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Old Nov 6th, 2019, 16:58   #12
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I would imagine the OP has discovered that seeing as it was three years ago.

That aside I agree that they are a complete waste of time
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Old Nov 6th, 2019, 18:35   #13
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As long as the thermosttic air intake valve on the air cleaner is working correctly, the best economy will come from leaving it all as Volvo intended. It will only make a difference on tuned engines and even then the biggest restriction is the MAF so unless that has been changed, a CAI kit won't make much difference to either the performance or economy but might make it run rough due to colder air on idle and the pulses of air not being damped by the air cleaner housing.

Best bet for an upgrade air filter is a K&N panel replacement filter such as :

https://www.ebay.co.uk/itm/K-N-air-f...6/332525662505

That will fit some 940s but not all, there is another available so you need to measure your existing air filter element.

I have a K&N panel replacement in my other beast (snail shell shaped filter! ) and that has made an improvement to economy and performance, only marginal in both but a couple of mpg and much livelier. A passenger noticed the difference when i fitted it without mentioning anything to them that it was a fair bit livelier.
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Old Nov 6th, 2019, 19:59   #14
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I'm considering adding a 4inch tube from the grille area into the airbox.It is my belief that with all the entry points into the airbox currently opened there is actually a lowering of the ram effect,so closing those off and cutting a single entry point into the front of the box has to be better.Ill make sure that the top of the airbox fits properly and is sealed with draught excluder or similar to make it airtight...
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Old Nov 6th, 2019, 20:09   #15
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Originally Posted by 940volvoman View Post
I'm considering adding a 4inch tube from the grille area into the airbox.It is my belief that with all the entry points into the airbox currently opened there is actually a lowering of the ram effect,so closing those off and cutting a single entry point into the front of the box has to be better.Ill make sure that the top of the airbox fits properly and is sealed with draught excluder or similar to make it airtight...
What's wrong with the one Volvo fitted?

Ram effect is over-rated, you'd have to be traveling at speeds way in excess of what your car is capable of to get any ram effect from driving.
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Old Nov 6th, 2019, 21:06   #16
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Oh,ok then.
I thought turbos liked the cold air intake?
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Old Nov 6th, 2019, 22:48   #17
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Oh,ok then.
I thought turbos liked the cold air intake?
Hmmmm, nice big intercooler cools down the inlet charge.

Forgot to also mention, a lot of turbos don't appear to have the thermostatic air intake valve but still have a cold air trumpet from the grille area to the air cleaner. It has raduised edges so flows a lot more than a plain pipe much bigger.
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Old Nov 7th, 2019, 13:43   #18
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my 940 has a cone filter. Ebay cheapo.

I'm wondering if this is causing my stalling engine. But then it might be the O2 sensor that was bodged into the DP. Don't ask it's not my work!

It's loud but not too bad.
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Old Nov 7th, 2019, 14:38   #19
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my 940 has a cone filter. Ebay cheapo.

I'm wondering if this is causing my stalling engine. But then it might be the O2 sensor that was bodged into the DP. Don't ask it's not my work!

It's loud but not too bad.
Could be - if you have the original refit it and see if things improve. You could also try removing fuse #1 for a few minutes to clear fuel trims, fault codes etc and let it re-learn with a clean sheet as it is.

There could of course be other faults causing your stalling such as blocked breathers etc but try the simple stuff first.
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Old Nov 7th, 2019, 14:55   #20
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Not to go off topic too far but... I checked the codes and got 111 all good on all areas. The PCV box has been removed and cleaned (it was not dirty tbh) I can see some gears under that box. It's chipped and was OK before changing the air filter.

I have however found the O2 sensor was screwed in about half way so not getting a good reading from the exhaust flow? I cleaned the boss up and waiting for the M18 1.5 die to come so i can clean the sensor up because it's been rammed in the hole.

My throttle cable was not in the correct groove so the TPS was not switching on the idle control correcly. Had massive improvement since. However coming down from high revs down the gears and putting clutch in as I go for 1st will sometimes result in the revs dropping and it dies. It will happen several times in a row then not for another 10miles or whatever. Idles fine otherwise.

Anyways back to air filters. Don't bother with cones unless you have a reason. The volvo airbox is massive. Route some cold air into it.

Or fit water meth injection / big intercooler or charge cooler.
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