JusticeRX7

I know that without my airpump that my 5th and 6th ports do not open, but latley i've had to drive my car and I was just wondering if this could cause it any longterm damage. If i accelerate slow i can slide right past 3500rpm without my car sounding like crap.

Also I was wondering why didn't I have this 3500rpm problem before. The guy I bought the car from took off the belt for the airpump and unhooked the hose from the cat...but left the pump in place and the cats intact he said it was to gain horse power. and the car was actually pretty fast when I first got it...then out of nowhere it sounds like crap at 3500. Can somone Please help??

DEZERTE

i dont think it will do any harm to the car.. do you have an S5 for S4?

mythe7

on an s4 the exhaust backpressure opens the actuators so im guessing that he has an s5. is your actuators arent opening because theres no air pump you can take them off and tie the rods open. its a matter of like 4 bolts and a wire.

VietFC

you're destroying your cats also. So you lose high end horsepower and you're clogging your cats. 2 large downsides to just undoing the airpump belt and removing the split air pipe

pyrojunkie

Correct

The cat needs a functioning airpump, otherwise it can't do its job and will only start to clog up. If you stay without the airpump, better ditch the cat for a straight pipe.

chumma7

why do you think your actuators will not open with an airpump?
in your profile it says you have an 87na - this is an s4, which means your actuators are controlled by exhaust backpressure.
the actuators on an s5 (89-91) are controlled by the air pump.

the reason the car sounds like crap and is losing power at 3500 is probably because your cats are not functioning since they rely on oxygen pumped by the air pump and delivered through the split air pipe (hose that connects to cat).
either get a straight pipe or header/presilencer to replace your clogged cats or reconnect your air pump belt and split air pipe and get a new main cat (if you live in a state where emissions is strict)

chumma7

why do you think your actuators will not open without an airpump?
in your profile it says you have an 87na - this is an s4, which means your actuators are controlled by exhaust backpressure.
the actuators on an s5 (89-91) are controlled by the air pump.

the reason the car sounds like crap and is losing power at 3500 is probably because your cats are not functioning since they rely on oxygen pumped by the air pump and delivered through the split air pipe (hose that connects to cat).
either get a straight pipe or header/presilencer to replace your clogged cats or reconnect your air pump belt and split air pipe and get a new main cat (if you live in a state where emissions is strict)

chumma7

err hehe.. site just puked out a double post

SDrotary-FC

i run the RB headers to a bonez cat with no air pump and my cats are not clogged

pyrojunkie

You are running an aftermarket cat that doesn't need an airpump. If you have nothing useful to add to the thread, then don't.

pyrojunkie

A new cat will be needed to pass emissions if you managed to clog this one.

turfgrower

ok, so I just got an 86 N/A and it has the air pump removed and a very old looking exhaust. The air pipe to the cat is also disconnected. From what I am hearing here, this is ok and I don't need to worry about anything?

pyrojunkie

Your cats will clog without oxygen Then you'll start increasing backpressure in the exhaust causing poorer and poorer performance until the point you pop your engine.

Does that sound like you have nothing to worry about?

IF YOU DO NOT HAVE YOUR AIR PUMP, REMOVE THE CAT OR REPLACE IT WITH ONE THAT DOES NOT REQUIRE AN AIRPUMP.

If the restriction buildup is left unchecked you will break the motor.

turfgrower

you guys are saying that the S4 actuators open with exhaust backpressure....which I believe. But if I have a straight pipe instead of the stock system, will this mess up my backpressure and hinder the actuator's preformance. If they are set to move at a certain pressure, I'm wondering if a straight pipe will produce this needed pressure.

WAYNE88N/A

I've never heard of a cat that doesn't need an air supply to function properly, that's a new one. What do they use for the material? Unobtainium perhaps, with maybe an internal flux capacitor?

shiftnmadkwik

just standard type material, but the catalyst is different where it no longer needs air injection.

but i think the turbo bonez system still has the air pump inlet.

i could be wrong. send the guys at rx7.com an email, they stock them they should know

WAYNE88N/A

Provides it's own oxidizer, then, huh? Hmmm...

Why does the Bonez hi-flow cat have the split-air pipe connection, then?

Rx7MPGUY84

my cat is hiding in the basement. wait, oh the catilitic converter. hehe. thats extra peices. get rid of em. let your 7 be freeeeeee.

SDrotary-FC

just a few post up you state that if you are running a cat you will need a air pump, you did'nt say if it was a stock or after market

superstock2

iTrader: (9)

would an 88 gxl not start because of removed cats?

casio

i'm with wayne. sounds a bit strange that this cat oxidizes itself. it must come pre-packaged with enough O molecules to last itself 50,000-100,000 miles. crazy. please elaborate.

pyrojunkie

I was only refering to his cat. I made no general statements of all cats.

Also I don't know why certain aftermarket cats don't have need an airpump. I don't have one or have even seen one. Maybe they naturally aspirate the oxygen it needs

DEZERTE

get a good exh system and remove air pump wee.