sports air filter

Post by **Chris_C** » 21 Mar 2006 02:51 am

Ronnie wrote:Anyone got pictures of cone filters in situ?

Ask Vicky

I've got a few plans up my sleeve now I've got Fake running, whats the point of having a brand new weber if you leave it on the engine... Short term is sussing out some breathing

Post by **Ali** » 21 Mar 2006 10:10 am

Sod that Viper ram air filter, make your own, got my air filter free from a mate but they only cost £30 new, then get ducting from Wickes, £6 for 6m of flexible aluminium ducting which was the perfect size for the air filter, some of those Viper type systems sell for silly money ~£250

Post by **foggyjames** » 21 Mar 2006 07:49 pm

Ali wrote:some of those Viper type systems sell for silly money ~£250

Bloody hell! Does anyone actually buy them?! Jesus, you can buy a decent brand new turbo for that if you know where to look....

cheers

James

Post by **Ali** » 21 Mar 2006 08:03 pm

Yep its absolutely ridiculous, just checked and car specific ones are £250 and universal ones are £175!! Imagine the profit on those things!

Post by **SteveP** » 21 Mar 2006 08:15 pm

let me guess... all for Renault Clio's? Targetting the chav's in underpowered 1.2's...

Post by **jtbo** » 21 Mar 2006 09:01 pm

Hmm, let's see what those ricer boyz call my air intake, oh yes, CAI that is what I have, umm, also freeflow something ZYX airfilter casing, oh and also ramcharger, uhm maybe that is what it is

Basicly what I did was to remove that hot/cold flap and put some aluminium (ooooh, more ricer points

) air pipe/tube, what do you call that, from airfilter box to front fog lamp hole, so when I drive wind will push air to engine, cold air of course.

So I have at least 50 ricer HPz more than without those

Hmm, moment, I have also modified throttle plate and throttle plate axle/shaft, what is that called, hmm I have no idea, I'm sure there is ricer term for that too?

So let me see, these all mods, so my car is now worth £350 more, right?

Well, if those all give me 1hp more, I could care less, but what those do is that engine responce is bit better, also fuel consuption did go bit down.
At 80kph I get maybe 5kpa more manifold pressure, so if ambient pressure would be 100kpa I would get 105kpa, can't say that is much of anything. I could of course make that aluminium tube to sit better to airfilter box as there might be bit of leaking now, hmm

Ok, ok, I'm very evil antituner person, but I can't help it, it is way I was born

Post by MJ » 21 Mar 2006 11:19 pm

Your mods seem cheap even if they don't give massive performance, and cheap is good

Post by **jtbo** » 21 Mar 2006 11:39 pm

MJ wrote:Your mods seem cheap even if they don't give massive performance, and cheap is good

Well, at least compared to those 'cool name kits', I get same performance gain and practically with 0 investment.

£250 from some air filter thingy, rofl and often those are not even as good as if one would do little work by himself, maybe there is no cool name or fancy looks, but performance gain is there

Hard work seem not to be cool nowdays, so finding information and learning stuff is not cool either, what is cool is to get same brand stuff as in some of those magazines that has more girls than cars

Am I old already?

Post by MJ » 22 Mar 2006 12:30 am

I have real respect for people with mecahical knowledge to build stuff for themselves, like in the very early days of hotrods, when there wern't performance parts avalible, you just took what you found and modified it.

Anyone can pay a fortune for off the shelf kit and for someone to fit it.

The air ram thing souns a good idea, although you'd have to watch out for water if the intakes to low (right Vicky

) Does it give much performance increase?

Post by **340GLT** » 22 Mar 2006 02:28 am

Hear hear. I know exactly where you are coming from guys and TBH i prefer the 300 being that way. As everything is custom it means that all 300's are different. Push mods with what you can get your hands on and the cheaper the better.
Adam

Post by MJ » 22 Mar 2006 07:06 am

Your car is a perfect example of customising Adam. Bar the front vallence, (which was a very small run, so half way there) all the stuff you've done is uniquie, like the lip at the bottom of the vallance.

Post by **pettaw** » 23 Mar 2006 12:12 am

The warm air feed is necessary in times like these to stop icing inside the inlet manifold which will really screw up your AFRs. Don't forget that once the intake is up to the right temperature, the flappy thing closes over and puts the intake to full cold anyway, which is going to be better than a cone filter cos its isolated from the heat of the engine bay.

Air filters, particularly those of us living in the cities, clog up within 6 months, and if you simply change your air filter for a good OEM one, or ideally a Volvo one, you'll notice a performance gain straight away. As Foggy says, the air intake isn't the main restriction to the breathing of our cars cos they're the same as much larger engined versions in other models.

Post by MJ » 24 Mar 2006 02:18 am

We changed the air filter in the summer, and looked back over the files for when it was last changed and couldn't find and mention! The old one looked in need of changing when it came out!

As soon as I drove itafterwards it kept accelerating harder than I meant, and although there could have been some placebo effect, if certainly felt more powerfull

Post by **jtbo** » 24 Mar 2006 11:36 am

pettaw wrote:The warm air feed is necessary in times like these to stop icing inside the inlet manifold which will really screw up your AFRs. Don't forget that once the intake is up to the right temperature, the flappy thing closes over and puts the intake to full cold anyway, which is going to be better than a cone filter cos its isolated from the heat of the engine bay.

I disagree, but only with injection models. Only carb models need preheating near 0 temps, but colder than that and it is not needed.

Icing is happening because airspeed in carb venturi is so high that air will cool down, if there is lot of humidity or fuel, carb may get frozen.

With fuel injection that is just useless thing to have and with B200K carb I had no problem without heating either as carb has also this thermistor.
Fuel injection manifold does not contain fuel in that manner that it would cause icing, fuel is injected to near valve.

But why you like to remove is not that it would suck hot air, it is because thing makes huge resistance to air flow, just take that part out and look it, compare hole in airfilter box and then look flap thingy, it is making good deal of resistance.
Second thing is that those tend to start malfunction when old, flap is not moving by temperature anymore, mine had this too, actually both of these flap things that I do have had same problem.

On turbobricks there is on technical information page more information what causes airflow restriction on 700 serie turbo, we have basicly same parts and you can see from there what is upgrade no1 from performance wise.

Airfilter btw is good for around 500hp, I have heard from V8 with that amount of power that uses same airfilter, it is drag race car, so pointless to spend money on that segment, specially when you can easily get cold air outside engine bay with stock airbox.

Also other misbelief is that you should not polish intake manifold to mirror surface, this is not true with fuel injection either, if leaving surface bumpy would help with airflow, then aeroplanes would be hammered to look like a golf ball...
Everything comes from carb technology, that has different rules and there you like to have little bumpy intake walls.

But carb technology is not going to survive very long I'm afraid, new cars have not had carbs for years, prices will get very high and availability will soon be problem.

I think renault had 1,7l injection models, maybe possible to look fuel injection from there to smaller engines, don't know what those costs, but at least in here performance carb route is more expensive than fuelinjection route, specially as with carbs you need to find specialist that still has parts or then pay insane sum of money from carbs that still are getting new parts.
At least that fuelinjection is what I would be looking if I would have 1,4l or 1,7l engine.

Post by **Ronnie** » 03 Apr 2006 04:41 pm

I've just fitted a Rip Speed cone filter pointing down at a right angle directly from the air mass meter. It points straight into a cold air stream and is away from the heat of the exhaust manifold. I've deleted the entire air box and ducting, including the hot air feed. I'm not concerned about icing. My previous two mk3's had the hot air duct removed by previous owners and both ran fine in sub-zero temperatures.

I swear I've got more power, and that fruity induction roar was really quite unexpected. Job done for 25 quid. I'm quite chuffed with the result.