Jimmy M

Can I just unplug this if I dont want to use the air pump? Straight 3" exhaust, no cat...

Thank`s!

Jimmy

Mahjik

iTrader: (1)

Yes.

7_rocket

iTrader: (6)

Thats what I did with mine, no more damn moo moo sound from my apexi intakes

Jimmy M

Yes, that`s the reason! Thank`s guys!

Has a new rebuilt engine, so I`m running the first 600 miles with stock mods. The cat on. Tryed to unplug it now, just to see (wasent going to drive with it) but the car dident "idling" (would that be the right word?) verry vell. Diden`t run like it should. Is this a sign of the cat beeing crammed/packed? The reason I ask is because my turbo get`s verry easy glowing red...(?) Shoulden`t be running lean eighter.

Mahjik

iTrader: (1)

Are you using the stock ECU? That's not a good idea if you are running a midpipe.

Any way, with the stock ECU (or a rechipped stock ECU), you'll need to raise the idle up to around 1100 rpms. Otherwise, it will choke itself out from being too rich without the airpump.

jmadams74

You can't fix the moo? Lot's of suggestions on here to fix it. No need to pollute unnecessarily.

7_rocket

iTrader: (6)

Did you read what I wrote?

jmadams74

If I understood what you wrote I thought you disconnected your air pump to get rid of the "moo." I'm suggesting getting rid of the moo by some other means and keeping the airpump connected.

Jimmy M

Yes, I`m running the stock ECU. But would the airpump make any difference when the cat is gone? Will it choke any ways with the midtpipe, ore only if I take away the pump? Going fore bigger injectors along with the midtpipe, but keeping the stock ECU...

Thank`s

Jimmy M

I would like to know how? The main reason is getting rid of the "moo" ...

Sgtblue

iTrader: (16)

As mentioned, running a midpipe on the stock ECU isn't a good idea. Check the sticky FAQs and definitions for Boost CREEP and search using that term for more information.

----> https://www.rx7club.com/showthread.p...&highlight=moo

Mahjik

iTrader: (1)

The airpump air runs into the ACV for secondary air injection before the O2 sensor. When you remove the airpump, there is the same amount of fuel being supplied by the ECU, however there is less air. Therefore you are in a rich condition which causes the car to stumble. Increasing the idle rpm (thus providing more air) helps solve the issue without getting a programmable ECU to program your idle.

Running larger injectors with the stock ECU will not work well. The stock ECU will not know any difference in the injectors. The ECU just works off duty cycles, it doesn't meter how much fuel it's using. So if you use larger injectors, the stock ECU will still think they are the stock injectors and you'll be flooding the car with too much fuel. i.e. say the stock ECU is using 80% duty cycle for 850cc injectors. 80% duty cycle of 1300cc injectors is a LOT more fuel.

I suppose it would be possible to use extra injectors on the intake elbow and then use an Additional Injector Controller (AIC). However, after all that you could have just bought a PFC for a little more.

Jimmy M

Wow! Thank you soo much...

So if I get the idle up to 1100rpm this should go smoth?

Boost creep shouldent be a problem, because the wastegate is ported.
The guy ho rebuilt the engine told me so. He says he has a perfect recipe, two injectors that fits perfect for the 3" exhast.

Bought this car with a broken engine, my first rotary. And delivered it fore a rebuilt. I have asked several times if I should buy a PFC, but he says that wouldent be necessary. Dont really know what to do about that...

4CN A1R

iTrader: (6)

i have also heard of people taking out the restrictor pills when running turbo back on the stock ecu. they say it never creeps past 10psi

MOBEONER

iTrader: (18)

so whats the final conclusion here-take it off or not?? i also have 3"exhaust system with a 3"cat and my air pump is not connected to the cat,but its still attached to the serpintine belt, should i take it off or not?

Sgtblue

iTrader: (16)

The issues IMO to consider..... First, removing the AP will not affect performance. Two, removing the AP will require either a replacement idler pulley or installation of a over-sized pulleys and a shorter belt ala Greddy (or other) to maintain at least minimal belt contact with the waterpump. Third, there is at least some risk of reducing the life of your cat. You decide.

7_rocket

iTrader: (6)

I don't need the airpump, car wont pass emissions anways.