A few people have PMed me asking how I made my det cans, so I thought I would put all the info in a post with piccies.

What I used:

A good pair of ear defenders (no B&Q poo). Try a gun shop

Some copper pipe

A copper “T” piece

Some air line hose

Arraldite


What you do:

Drill a hole in the back of each ear muff (herr her, muff) and insert a short length of copper pipe. Make sure it protrudes past the insulation on the inside and has enough on the outside to jubilee your pipe to.
Arraldite the short sections of copper in, making sure they are fully sealed.



Use your air line hose to connect both ear muffs to the T.



From the T run a length of the hose under the bonnet.

Take another bit of copper pipe between six inches and a foot long. Squash one end (about an inch worth) flat in the vice and drill a hole though it. Make sure when you squash it that the end is totally sealed. Check it by blowing down it.

Bolt the squashed bit of the copper pipe some where on your engine block and jubilee the hose on the other end and you are done.


Basically it works like a doctors stethoscope…. But on a larger scale and for your engine.

In this picture you can see the hose coming out of the engine bay and into the car through the sunroof. We have used masking tap to secure it when mapping on the road.



One final note. When you use these kind of det cans you cannot map in the rain (apart from the sun roof being open)! The rain droplets make a real racket on the hose!

Doug.

 

PMSL @ in the sunroof.

Why not just go through the door like this?




Or is it could you used such large diamter pipe you couldnt?

 

even if the tube was too thick you could at least crack the window and go in there?

little less vision obscuring!

 

The pipe was a big on the thick side but we tend to use what we can get our hands on for free out of the stores at work There was a nice big reel of airline hose!

Leccy window motor has gone kaput and it was too thick to go through the door seal so sunroof was the last option. Get some funny looks out on the road!

 

is that a boosted e30 m3?

 

Yup!

 

 

Andy. See here.

https://passionford.com/forum/viewto...55536&start=40

 

quality job dude i love those E30 M3's at the best of times nevermind boosted

 

what do people use them for? as in why does a normal road car (ie chips) have them? i thought only tuners used them?

 

I believe Chip maps his own car, hence his usage.

 

ahhh, that would explain.

 

i put mine thro the balk head, or as chip does,

i use solid plastic air line, 6 or 8mm i think.

 

where bouts is the best place to position the other end to pick up detination?

 

i found best on a CVH and a cossie,

on the back of the block, if not on the centre inlet manifold to head stud.

 

As close to the head gasket as possible. Thats where the combustion chamber is.

 

what sort of sound are you all listening for i want to start tuing my own car..these sound like a really good idea .."and cheap" plus i can get all the bits from work

 

Thing is, the type of hose, diameter and length affects the 'tuning' of it.. The ideal for det frequencies is 8mm fuel hose and about 6-7 ft in length.

 

is the noise a kind of flickering noise

 

easy

 

what is a det can ?

 

A device for hearing detonation in an engine for tuning purposes.