Drilled Airbox Mod - XUD9

Synergietom · Post by **Synergietom** » 02 Apr 2010, 23:54

LOL guys obviously this chap thinks it works why not let him keep believing it and we can all take the mik when his air filter fails due to hot air being sucked in ( I work mann filters ( sorry i cant get any cheap ive tried) )

Brigsygtt · Post by **Brigsygtt** » 03 Apr 2010, 00:54

The standard ram air setup works fine, as already said adding hot air is a waste of time.

A previous bodger owner of my xantia had drilled the airbox, made no difference in power

i changed it back to std with no difference apart from less noise

The only worthwhile upgrade on standard setup may be uprated element depending on material.

V6 berlingo i hear you say Jim, would make a nice parts carrier. Next project?

Synergietom · Post by **Synergietom** » 03 Apr 2010, 01:05

To be honest changing the element material doesn't make enough difference to be noticeable in performance or economy unless you make a mod as segnifficant as a K&N mod the only real difference in changing the material of the the ellement is the life span and to be totally honest its not worth paying the extra cash compared to the difference in life span you'd be just as well attempting to clean the old one with a vacume cleaner for all the difference it makes

Toby_HDi · Post by **Toby_HDi** » 03 Apr 2010, 02:08

Talking of Berlingo V6's

Not quite a Berlingo but it's Peugeot sister....

http://www.peugeot406coupe.com/phpBB2/v ... hp?t=25613

rmunns · Post by **rmunns** » 03 Apr 2010, 08:24

Yes, no-one has mentioned that a K&N filter will add power to the set-up and hence there are gains to be had from altering the airflow.

So can anyone say how they do this?

Xaccers · Post by **Xaccers** » 03 Apr 2010, 09:34

rmunns wrote:Yes, no-one has mentioned that a K&N filter will add power to the set-up and hence there are gains to be had from altering the airflow.

So can anyone say how they do this?

Larger surface area and less restrictive material so more air can get through.
Thing is, Xantias for instance have a huge air filter anyway, so I doubt it will make enough of a diference to justify the cost.
Replacing a CAT with a straight pipe would be cheaper and give more of a performance boost.

DickieG · Post by **DickieG** » 03 Apr 2010, 09:35

rmunns wrote:Yes, no-one has mentioned that a K&N filter will add power to the set-up and hence there are gains to be had from altering the airflow.

So can anyone say how they do this?

An air filter restricts the flow of air, a paper filter is relatively thick whereas a K&N filter is thin cotton gauze so less restriction to the airflow. The degree of power gain through fitting a K&N type filter depends upon the size/surface area of the original filter, the smaller the original filter the bigger the gain through fitting a K&N. In the case of a Xantia the filter surface area is already quite large so any gains in power through fitting a K&N filter will be minimal.

rmunns · Post by **rmunns** » 03 Apr 2010, 09:57

Thanks for the comprehensive reply. I'll take K&N filter off my eBay watching list!

XantiaMan · Post by **XantiaMan** » 03 Apr 2010, 09:59

rmunns wrote:Yes, no-one has mentioned that a K&N filter will add power to the set-up and hence there are gains to be had from altering the airflow.

So can anyone say how they do this?

Fitting a K&N element to an airbox with sufficient volume and feed will gain very little. Its already been mentioned that the standard paper filter is large enough to cope with the volume of air required for the engine.

K&N elements are often smaller than their paper counterparts, this has the effect of increasing the volume of air inside the airbox, but if the standard filter (when new) flows enough air, then there is going to be no power increase detectable, apart replacing the old clogged elements.

However a K&N does flow better than a paper filter when clogged, so performance will be maintained over a longer period. This would be my reason for fitting one. Because the air volume in the filter box has changed, so does the induction noise, so they sound a bit better too.

Any gain you make on improving the induction will come from changing where the air feed sucks its air from. The more cold air you can get to the engine, the better it will perform.

I never changed the filter set up on my Activa. It was big enough, and the feed to it isnt too bad. The Xantia i would look at improving in this area would be the V6.

siraff · Post by **siraff** » 03 Apr 2010, 11:06

Sorry but I don't think the thread poster understands how a diesel works.
The airbox is not restrictive on a berlingo in any way. You could take the intake off altogether and nothing would happen.
Diesel's burn diesel. To make more power they need more fuel. If you have done nothing with the fueling it won't make any extra power. It may rev more freely if you get rid of the cat/etc but to be honest I doubt that will be restrictive on a non turbo either.
Drilling holes in the airbox is something that's turned up in boy racer circles. Its the new K+N - something which will also net you a gain of pretty much nothing on most modern engines.

Think of it the other way. Car makers throw millions (sometimes billions) into R+D when they make a car. If there was a gain to be had for free by moulding some extra holes in the airbox do you really think they wouldn't have already done it?

Anyway if you want more power turn the screw.

tonupteabag · Post by **tonupteabag** » 03 Apr 2010, 11:35

siraff wrote:Sorry but I don't think the thread poster understands how a diesel works.
The airbox is not restrictive on a berlingo in any way. You could take the intake off altogether and nothing would happen.
Diesel's burn diesel. To make more power they need more fuel. If you have done nothing with the fueling it won't make any extra power. It may rev more freely if you get rid of the cat/etc but to be honest I doubt that will be restrictive on a non turbo either.
Drilling holes in the airbox is something that's turned up in boy racer circles. Its the new K+N - something which will also net you a gain of pretty much nothing on most modern engines.

Think of it the other way. Car makers throw millions (sometimes billions) into R+D when they make a car. If there was a gain to be had for free by moulding some extra holes in the airbox do you really think they wouldn't have already done it?

Anyway if you want more power turn the screw.

i bought my xantia with no history or receipts for any work at all so after running it for a while i noticed the revs were constant at 1000rpm tickover hot or cold so i went and started from the top checking all the relavant settings to find the fast idle lever was maladjusted it didn't release at normal temp so it was duly reset now its fine
anyway back to the point as it was set wrong it was running richer than it should and yes it was a little better in power but it was also very anti people as the black smoke out of the back at half throttle was not only embarrasing but very good at attracting the ministries attention as it looked like it was running on red they weren't very pleased when they dipped it and found it was indeed on white

red_dwarfers · Post by **red_dwarfers** » 03 Apr 2010, 12:19

tonupteabag wrote: i bought my xantia with no history or receipts for any work at all so after running it for a while i noticed the revs were constant at 1000rpm tickover hot or cold so i went and started from the top checking all the relavant settings to find the fast idle lever was maladjusted it didn't release at normal temp so it was duly reset now its fine
anyway back to the point as it was set wrong it was running richer than it should and yes it was a little better in power but it was also very anti people as the black smoke out of the back at half throttle was not only embarrasing but very good at attracting the ministries attention as it looked like it was running on red they weren't very pleased when they dipped it and found it was indeed on white

The maladjusted fast idle lever would have probably been a broken fast idle electrovalve, common problem on the Bosch Diesel Xantias. It doesn't make the fuel mix richer, just increases the engine speed a tad.

tonupteabag · Post by **tonupteabag** » 03 Apr 2010, 12:24

red_dwarfers wrote:
tonupteabag wrote: i bought my xantia with no history or receipts for any work at all so after running it for a while i noticed the revs were constant at 1000rpm tickover hot or cold so i went and started from the top checking all the relavant settings to find the fast idle lever was maladjusted it didn't release at normal temp so it was duly reset now its fine
anyway back to the point as it was set wrong it was running richer than it should and yes it was a little better in power but it was also very anti people as the black smoke out of the back at half throttle was not only embarrasing but very good at attracting the ministries attention as it looked like it was running on red they weren't very pleased when they dipped it and found it was indeed on white
The maladjusted fast idle lever would have probably been a broken fast idle electrovalve, common problem on the Bosch Diesel Xantias. It doesn't make the fuel mix richer, just increases the engine speed a tad.

no it wasn't broken someone had adjusted it before the engine had got to temp i readjusted it and it is now working exactly as it should ie 1000rpm cold 800rpm warm and a significant drop in smoke opacity

red_dwarfers · Post by **red_dwarfers** » 03 Apr 2010, 12:34

tonupteabag wrote: no it wasn't broken someone had adjusted it before the engine had got to temp i readjusted it and it is now working exactly as it should ie 1000rpm cold 800rpm warm and a significant drop in smoke opacity

Ah fair enough, proper job!

tonupteabag · Post by **tonupteabag** » 03 Apr 2010, 13:22

ah now i understand the "proper job" term

i see your not too far away from me whereabouts in exeter are you? i know rockbeare quite well as i have friends over there