exhaust air pump ??

rising son · February 22, 2012, 11:29:58 AM

no idea what this is but this is text ive copied from a post on facebook by somebody.....
The pump is driven by a belt and sits on the offside of the engine and will have a pipe that runs through a vacuum operated valve and then another pipe into the exhaust it pumps air in on idle and overun too stop flames and help emissions testing
.......... apparently removing this dosent do any damage? and causes more flamage?, anybody heard of it?

Prof · February 22, 2012, 12:03:56 PM

removing it makes it harder to get through an MOT without proper tuning of the warm idle, and if you\'ve still got the stock exhaust with it\'s CAT, you need this still.

rising son · February 22, 2012, 12:37:37 PM

mot isnt a problem, my exhaust is a cat back... so guessin this is no good then

B.Martin · February 22, 2012, 12:40:21 PM

If you search \'air pump\' on this 2nd gen section we covered it a month or 2 ago because I looked into it and have bought the nessisary items to remove it.

rising son · February 22, 2012, 01:33:53 PM

ah... nice 1 thanks.... had a read... REALY cant get my head round these engines at all !!

B.Martin · February 22, 2012, 04:02:55 PM

This is my second FC and I\'ve still got much to learn!

m1tch · February 22, 2012, 07:04:30 PM

Quote from: rising son;813335ah... nice 1 thanks.... had a read... REALY cant get my head round these engines at all !!

The air pump basically does 2 things, first thing it does is pump air directly into exhaust to reduce emissions - my car only had the air pump with no cat and it got 0.18% CO on the emissions out of the 3.5% allowed. The other pumps air into the cat to stop them imploding under the massive heat of the rotary lol

rising son · February 22, 2012, 07:08:22 PM

right so with the cat on the down pipe still in place i realy shouldent disconnect this?, just a thought but seen how its apparently belt driven can you not just take the belt off?

m1tch · February 22, 2012, 08:02:52 PM

The only real reason people disconnect it would be for the extra space you would have on the turbo side of the car, I need to remove mine to be able to fit the larger turbo, although im fitting an electric air pump instead meaning I won\'t have issues with the emissions, but gain space back in the engine bay.

The issue with taking the belt off is the fact that the air pump belt goes around the crank and the water pump as well, the water pump is run by 2 belts, when removing the air pump you need to fit a dual pulley for the alternator so that the water pump has enough belt tension on (ie 2 belts vs 1) so that it doesn\'t slip and the engine doesn\'t over heat.

If you don\'t need the space you might as well keep it until the point where you need the space and buy a dual pulley for the alternator and blanking plates for the intake (where the emissions stuff used to be)

rising son · February 22, 2012, 09:46:30 PM

in all honesty the only reason a was considering doing it is for extra flamage

m1tch · February 22, 2012, 10:09:54 PM

Change the fuel pump for a beefier one and don\'t change the stock FPR lol overfueling FTW!

rising son · February 22, 2012, 10:28:32 PM

lol... its already running rich... get the odd big flame, change of pumps not a bad idea all the same

B.Martin · February 23, 2012, 08:34:43 AM

I\'m thinking about doing this but i\'ve been warned off a walbro pump.

Prof · February 23, 2012, 08:40:03 AM

Quote from: B.Martin;813474I\'m thinking about doing this but i\'ve been warned off a walbro pump.

why I wonder ?

Genuine walbro pump is better than the stock pump in all respects, and will easily allow 400bhp on a rotary with supporting mods - even on a serial fuel setup.

I can only assume you\'ve heard internet chatter about how you can\'t trust if you have a genuine part, and also about the reduced flow rate of these pumps at higher pressures. Both of these are true, but even with 2 bar of boost these pumps will supply enough juice for a standard FC engine.

Check out this link if you want the low down on pumps - this is from somebody who actually put the work in and did the tests...

http://www.stealth316.com/2-fuelpumpguide.htm

This is an excellent write up on pumps and really explains what to look for, what to check and how to size your pump requirements....

Ricco_04 · February 23, 2012, 08:53:08 AM

I have been using a Walbro pump on my fd for about 10,000 miles with no problems . . . .yet!!!

The air pump puts air to the cats to help stop getting blocked up as we do inject oil into the engine to burn.

You say you have a cat back exhaust so you still have the cat in place - leave the air pump in then. If you wanna see flames then you will want to be ditching to the cat.