I have run full exhaust for over 2 years now and decided to finally remove the un-needed air pump. The car idles a bit funny now. Not really bad but just differant. Is there something else I need to do along with the removal? I noticed in the work manual under the problem area of "idle fluctuates" one solution was a problem with the air pump, so this must affect the idle???

 

The air pump injects air into the intake at idle, so you are now running richer at idle. You will have to reduce the fuel in the idle cells, assuming you have a stand-alone ecu. If not, get one.

 

and also if you have the PFC, make sure you don't use O2 feedback under the settings section. It will read off the map and idle fine.

Tim

 

Thanks! But in reality it is only affecting the idle? I can deal with that until I talk myself into a stand alone, (again) Had the power fc but no around to tune it at the time so I sold it..

 

If you are on the stock ECU, the idle will probably get worse. You can increase your idle up higher so it won't die on ya or your can get a resistor to trick the ECU into thinking the airpump is still there.

 

I actually installed full exhaust and unplugged air pump a couple of weeks ago.

Idle was a little low so raised it. Idle was really steady, no problems but car ran soooo rich. Also, ECU doesn't throw a code when air pump is unplugged.

So I plugged it back up, not too rich anymore. But now I know my sticking idle problem has to do with the airpump because after replugging it and adjusting idle my idle will sometimes stick at 1200 rpm.

Anyone know of related solenoids and hoses that have to do with the airpump?

I'm thinking of doing the sequential simplification and remove the airpump later when a friend finds his friend to reflash my M2 ECU. Don't want to go standalone yet.

 

it idles rich because the air pump injects air into the exhaust, affecting the 02 sensor reading. if you unplug the airpump then the ecu will try and get the 02 sensor back into its target range by running really rich. the only real solution is to leave the airpump in or get some sort of an ecu that will ignore the 02 sensor

mike

 

That doesn't make sense. The air pump injects air at the main cat, which is downstream of the o2 sensor. Even if it injected air upstream, the o2 sensor would detect a rich condition with the pump unplugged (less o2) and LEAN the car out, not make it richer.

The rich condition at idle is caused by the ecu expecting air to be injected into the intake tract at idle from the air pump. When you remove the air pump, the ecu dumps the same amount of fuel in, resulting in a rich condition.

 

rynberg is exactly right, I have already done this research myself. You need to buy an aftermarket ECU.
The Power FC comes with a pre-programmed map for most twin upgrades and it is super easy to change injector size through the control pad if you have one.
I did some mods on my last RX7 and I dont have a tuner here in MN, so I just mailed my Power FC to RX7.com and told Chris what mods I had and he put a good, safe program into it, and mailed it back.. The car ran awesome, and when I had it on the dyno the A/F readings were right in the low 10's.

 

between idle and 2500ish rpms air is injected into the exhaust ports, air is injected into the main cat under cruise and decel. and the rest of the time the pump is off and or vented

mike

 

Thanks guys, One more item to add to my list!! And we just had Steve Kan here doing some tunning! Oh well maybe by the next time he comes I will be ready.

 

Your statement still doesn't address the contradiction of your earlier statement. If the o2 sensor doesn't see the air from the air pump, it would be reading too rich and would try to lean the car out, not the other way around as you stated.

Please explain if I am misunderstanding something.

 

I think Mike meant the ECU would try to LEAN out the mixture since the extra air from the air pump is not there.

He is right about the air pump directing air from the pump. Air is pumped into the exhaust ports at idle and lower rpms. At crusing and deaccel. it is pumped into the main cat. This is true on the 2nd gen and the 3rd gen might be slightly different.

Anyways as I understand, the 02 sensor is not even read at idle. Only crusing and light load conditions. Not at idle.

-Jeff