Different Cat.

A while ago I remember reading something about the normal cat has 400 holes/sq.in . The cat this person was talking about had 100 holes through it. I presume the holes were of a greater diameter in the 100 version. This, I think, would generate less back pressure in the system.
Anyone got any ideas.
Ian.

yes 400-600 on a standard cat. its measurment is cells per square inch. the lower the number the bigger the voids between the walls of the cells, the bigger the gaps between the walls the better the flow.

sports cat can be had any where these days even ebay have them listed for around 90 quid for a 200 cell unit.


[strike]my cat is a 1 cell [/strike] that wouldn't quite work as the cat box is bigger than an inch! I have no cellls.

When my exhaust goes I'll have a zero cell cat :lol:

Yep, it was me that posted about the sports cat. The holes are over 4 times larger and the sound out the rear, when coupled with 2" system and hotdog rear muffler, is AWESOME. Backing off especially, the burble is to die for

Oh, and the car runs better too, but the sound was what I was chasing!

Here is a link to the sound...




well, I hope it works this time.

That sounds awesome. What is the make and model of cat and what is a Hotdog rear box?

A hotdog is a muffler that looks like a hotdog, straight through a bulging tube which is lined with perforated stainless steel with spun stainless steel that looks like scrubbing pads, to absorb the highest pitched sounds and produce a deeper tone.

img121.imageshack.us/img121/2825/buuqdiwcwkkgrhqioknuevy.jpg

Supersprint cutaway of 100cspi cat

win.clubminitalia.com/vari/supersprint/supersprint_kat_03.jpg

PS

Here in Victoria Australia, we obviously don't have MOT, EVER. So, once you have first registered your vehicle, you are free to do pretty much anything in the way of mods with very few restrictions. You would have to do something "way out" to get busted

The cat looks like it is filled with corrogated cardboard. Which obviously it can't be otherwise it would burn away..
Sounds brilliant though.

ZookFastback wrote: PS

Here in Victoria Australia, we obviously don't have MOT, EVER. So, once you have first registered your vehicle, you are free to do pretty much anything in the way of mods with very few restrictions. You would have to do something "way out" to get busted

I thought the opposite! to many police programmes on the box with kids getting pulled with slammed chav wagons.