MK2 DIY induction kit.

[SmokinDonut]

After looking at all the available induction kits for the MK2 I decided I could do better. I wanted a K&N typhoon, but at ₤170, no way. Also I can’t understand why the intake is on the hot side of the engine? Some say it’s because by lengthening the intake tract you increase torque. But surely the engine bay is hotter above the exhaust than behind the right headlight?
So I measured some stuff and bought some other stuff from ebay and the result is an RPM needle that’s much keener to 7,000rpm, plus a great intake grumble under full throttle. It took me a couple of hours to fit as I had to reduce the length of the hoses.

76mm hose joiner – ₤5
HKS style induction filter - ₤13
Silicone hose reducer 76mm to 70mm - ₤6.30
Silicone hose 90 degree elbow 64mm to 70mm - ₤17
Plus some jubilee clips I had lying around.

All in ₤41.30 (including postage)

If you want to do this yourself:

The throttle body is 64mm.
The air flow meter is 70mm on both sides.
My HKS filter required a 76mm hard pipe to clamp to.

First carefully disconnect your air temp probe and AFM connector. Then remove your old air box and all associated piping.

You need to un-tape the air flow meter (AFM) wire from the loom so it will reach the other side of the engine bay. Also I drilled a 20mm hole in the silicone elbow so I could fit the air temperature sensor and grommet (using a 20mm hole saw).
Make sure your AFM is orientated correctly (with the flat part on top).

Tip: To cut silicon hoses clamp a jubilee clip round the hose and run a Stanly knife blade round the jubilee clip.

My car is a 1.6 2000

[MX-5 Lazza]

Looks like a neat solution. I wonder why it hasn't been done that way before!

p.s. you don't have a AFM, you have a "hot wire" MAF and it doesn't care about orientation like an AFM does

Edited by MX-5 Lazza on Wednesday 18th November 10:11

[tuttle]

MX-5 Lazza said:

Looks like a neat solution. I wonder why it hasn't been done that way before!

Agreed, looks like a relly neat job, congrats.
I have been thinking along similar lines for a 1.8 Mk1. I have an Arc Air chamber so i was looking to relocate behind left h/light. The downside would be that it would entail much "U-bendage" or modifying the Arc, which may not make for a very clear path for air to travel.
Any thoughts?

[SmokinDonut]

Sorry ignore AFM then and replace with MAF!

Also forgot to mention you’ll need to purchase a rocker cover breather filter- ₤5.28. The diameter of the breather tube is 10mm.

So that’s around ₤46 all in.

Edited by SmokinDonut on Wednesday 18th November 12:39

[wojadzer]

would an aftermarket intake pass mot?

(Edited)

Yes, as long as it's done properly and doesn't flap around... 😂

Edited by wojadzer on Saturday 30th March 20:02

[TVRees]

Nice write up. We'll done !

Was also pursuing something similar. Will post some photos, costs etc soon.

[TVRees]

So, here is my twopenneth on this subject ...... Just spent a nice afternoon fitting my "even more" budget C.S.I.

Parts list : including postage, all from eBay
1x Performance Universal Cone Air Filter Blue for 76mm / 3" Intake - £ 9.99
(this filter intake is the same diameter as the MAF in/out)
1x Silicone Hose 90 Degree Bend Yellow 75/75mm - £ 12.70
2x 70-90mm hose clamps - £ 2.50
TOTAL £ 25.29
In total, the whole job took about 4 hours - I'm not the fastest worker - and I do like to take my time
The work was as described below, there were really no problems and the whole job was quite easy, anyone could do it, I'm sure.
The throttle body diameter is 65mm, so I first wrapped around a thin strip of flexible plastic strip to fill this out to fit the 75mm hose elbow.

Before


AFTER



Removed this lot in the process.


I'm very pleased with the results and as mentioned there is a nice growl at high revs !

Why bother, you ask ????

Well the freed up space can now be filled with some forced induction goodies .......