Ok, here's the deal. I got 72 240Z with emission recirculation and i was wondering is it worth effort to take it off? We dont have emission limits to 30+ cars. Does it give any Hp or make engine rev better?

Also i would apreciate pictures and instructions about this.:stupid:

Thanks already!

It won't help performance to take it off.

Steve

Ok, is there any other good/bad sides?

Take it off.....It'll give you more H.P. just by dumping the drag created by the smog pump. Also it allows you to put 17 degrees of advance! It's a cleaner look.....Get rid of the extras on the balance tube....Bruce at Z Therapy will take care of that! All IMO.

Edited November 2, 200915 yr by Diseazd

Dropping the smog pump is dropping a lot of weight too...

Am I correct in understanding that the "smog pump" just diluted the exhaust gas with fresh air, to "cheat" the old emissions tests?

So the question was about the air injection pump and not the exhaust gas recirculator?

EGR leave on.

The air pump is a low pressure pump and takes almost no HP to drive. The weight is pretty insignificant too. Don't expect to notice a performance increase as it will be very small, but as other have said there will be one.

Steve

  Inf said:

Dropping the smog pump is dropping a lot of weight too...

Am I correct in understanding that the "smog pump" just diluted the exhaust gas with fresh air, to "cheat" the old emissions tests?

Unburned gas in the exhaust steam is given additional oxygen by the air pump to complete combustion to some extent. At the federal level emissions are measure by weight (grams/mile) so they cannot be diluted. At your local test center there is a dilution effect as they are measured as a percent or in PPM.

Steve

  doradox said:

Unburned gas in the exhaust steam is given additional oxygen by the air pump to complete combustion to some extent. At the federal level emissions are measure by weight (grams/mile) so they cannot be diluted. At your local test center there is a dilution effect as they are measured as a percent or in PPM.

Steve

That's true. In fact, if there any holes in the exhaust system or leaks of any kind that are large enough, the car will fail.

  Diseazd said:

Take it off.....It'll give you more H.P. just by dumping the drag created by the smog pump. Also it allows you to put 17 degrees of advance! It's a cleaner look.....Get rid of the extras on the balance tube....Bruce at Z Therapy will take care of that! All IMO.

I'd be interested to know what injecting air into the exhaust has to do with ignition timing.

Steve

I'm sure it has nothing to do with it. It's just that factory timing specs are less advanced on the smog pump equipped vehicles.

  sblake01 said:

I'm sure it has nothing to do with it.

Ya think?

Steve

Thanks for good points. BUT if im going to remove all those objects (air pump and all the other accessory related to it) is there any hints for doing it? Pics also help cause im quite dummy when comes to customising engine.