Hi fellas, hoping some of you on here have some insight into the mechanical properties of various induction kits etc, looking for a few pointers.

I'm going to be making my own carbon fibre air box when I get chance, basically reworking the standard airbox to provide better air mass and lower induction temperatures, combined with a bypass valve to counteract the problem of water ingress during winter. It's going to be similar to the ITG Maxogen kits but a hell of a lot cheaper, although i'm considering using one of their filters depending on which shape will provide the best air flow for the design.

Few things -

1. Air flow is at is densest (higher pressure) at the leading edge of the car, right? So the optimal place to have the trumpet for the feed is going to be pretty central to the car?

2. Possible ramming of the air is needed to negate the resistance the filter provides relative to the required air draw of the engine, is that correct? ie. running with no filter would be the optimum for performance with the downside of zero filtration?

3. Does the shape of the pipework before the filter at all affect the air flow after the filter? ie. would pipework with a lot of bends, or with flexi sections, negatively affect the flow of air? Is the straightest possible path ideal?

4. If you were to have a kind of "swirl pot" for the air, a cylindrical box with air entering to one side at the bottom, what shape of filter would be best, a conical or cylindrical filter?

5. Would having a trumpeted piece on the end of the induction hose have the same effect as trumpets on throttle bodies? What is that exactly? Increasing flow and reducing turbulence? If a flexi section was fitted to it, before the air filter, would it make any difference?

Lots of question still to come, does anyone have any links to this kind of research online anywhere? Motorsports journals etc?

I feel a project coming on

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Bye bye Sundance Kid

Hi Chris,

I just wanted to answer your questiong about "trumpeted" inductions. I'm gonna recall my jet engine knowledge here....

I don't know whether you're seen a jet engine in a test bed, but they too have a "trumpeted" type intake or "bell" type. The reason for this is because the engine is stationery. That type of induction is used to minimise the resistance the airflow encounters as it is sucked into the engine; resistance is along the intakes edges. That's why you have that nice curve or "trumpet" shape.

This is applicable to throttle bodies as they too are stationery. However, for your car a bell type induction is pointless as you're not using it for its correct purpose.

My heads swimming with ideas at the moment, none of which I can coherently put down in this post. When I can manage to put the words in order I'll post again.

Good luck with it though

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Deepak Gohil

I think before you actually make anything, you need to ascertain if there's actually any flaws at all in the standard system.

You need to measure the air pressure at the scoop and the other side of the filter at given engine loads and wind speed, this will give you some idea if you find any improvements anywhere.

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need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Its just based on my opinion. I just think that Peugeot must have spent X amount of money on designing the system which must mean it works.

Now I understand that you just wish to improve the after Market kits I wish you every bit of luck I've seen your skills in other threads

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Team Nile 6
Team: 40.2 MPG
5 x a 306 owner!
currently abusing type r's in a town near you ™
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness

are you any relation to Jeremy Clarkson?

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Team Nile 6
Team: 40.2 MPG
5 x a 306 owner!
currently abusing type r's in a town near you ™
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness

A tool isn't a tool unless it can make noise!

________________________________________

Team Nile 6
Team: 40.2 MPG
5 x a 306 owner!
currently abusing type r's in a town near you ™
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness

along a similar theory to the straight lines, the group N PTS (GREEN) induction kit for these cars is a straight pipe and places a fairly large filter right where the ABS pump goes, i.e they didn't have ABS

probably not ideal without any ducting or boxing in, but that didn't seem to worry PTS.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Forgot about ABS, mine has been gutted beyont all recognition now and I tenfd to forget what is crammed into a standard engine bay. Basicly its a compromise is'nt it? In order to get the best of something, you have to be prepared to make a fair few changes to what is already there. Question is, will all your effort lead to a result that warrants the time?

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R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars

A reducer will only increase pressure locally and just after, beyond that there will be a pressure loss. Air does'nt like sudden changes in section, the ideal angle for any kind of reducer if you decide you need one is a 15 degree included angle. Forget tryiing to force air into the engine using wind or reducers, think of the engine a powerful vaccum cleaner, if you can allow it to suck in air in the smoothest, least restrictive way possble you are onto a winner.

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R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars

As long as your cold air feed pipe is of a sufficient size that it's flow outperforms the exit from the airbox to the TB then you won't have to worry about pressure drops and reducers and such. I expect you will find the best performing filter to be a panel type, not as sexy as a nice cone, but far more surface area usually for a given size. You are going to struggle to increase pressure to the inlet side of the filter without the unwanted side effect of reducing air speed and mass flow.

________________________________________

R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars

Good idea the AEM valve, although an oil breather style filter (Piper do one with a 30mm neck) mounted near the top of the airbox would probably kill of any chance of the engine syhoning up water. Is there any way you can collect your air from behind the front of the inner wheel liner, with saty some ducted air coming from the fog light hole? It would be perfectly placed to avoud bieng ripped off by speed bumops and suckibg in water from puddles etc.

________________________________________

R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars

Here



The idea being a nice simple rigid feed to channel air to the airbox. Will need to research filter size to work out box size on the feed side of the filter so air pressure in the box doesn't drop too much.

Thinking of a conical base to aid air circulation too, to create a kind of vortex.

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Bye bye Sundance Kid