87racer

If i remove the ACV, put on a blockoff plate, and remove the air pump will my 5&6th open? or do I need to do the TB mod? How did you guys plug the vacuum lines when you removed the air pump and ACV?

J-Rat

iTrader: (2)

If your car is an 87, then if you remove the ACV, and The Airpump, you should still be okay, as long as your Cats are still intact. The 6-ports work on backpressure from the exhaust.

Rat

J-Rat

iTrader: (2)

But keep in mind, if you remove your Airpump, you are running the risk of frying your cats

87racer

ok.... sweet, thanks

87racer

how can i stop that from happening??? the cat problem that is

J-Rat

iTrader: (2)

Put the airpump back on, or remove the cats... There is no other way. If you remove the cats, you are gonna have to devise another way to actuate your 6-ports or wire them open....

The airpump supplies fresh air to the Cats to help with the chemical reaction. Without the fresh air, the cats will be history in a few months or sooner.

Rat

87racer

but to keep the air pump i have to keep the ACV right?

Aaron Cake

iTrader: (1)

No. You can connect the airpump directly to the split air pipe and by pass the ACV. This should allow you to run a cat with no ACV (though what's the point?).

My advice: leave everything alone unless you are planning to go full exhaust (headers, no cats, catback).

87racer

has anyone ever tried running the small second tube from the air filter straight to the split air pipe, bypassing both the ACV and the air pump? i would have to put something to stop the air from trying to back up the tube though right? just a thought

J-Rat

iTrader: (2)

That wont provide enough airflow...

87racer

well fudge!!!!! um... i was reading this thing that the search brought up... sometihng about a "test pipe"??? They said that this was the alternative to gutting my cats... anyone know what it is or where i can get one?

87racer

bump

J-Rat

iTrader: (2)

Test pipe, or race pipe. These are straight pipes that will bolt in to replace the Cats. Most exhaust places will make one for you as long as you tell the its for racing purposes.

Rat

87racer

if i dont have an air pump will it mess up my exhaust? i mean i paid a shitload of money for my borla exhaust and performance high-flow cats so i dont want to screw it up. would i be better off just leaving the damn airpump on there and just doing the TB mod? how much does the TB mod help in the high rpms???

J-Rat

iTrader: (2)

Okay...Here is the deal. If you have aftermarket cats, and you want to save them, get a race pipe fitted so you can swap out the cats for the straight pipe whenever you want to. Advantages to that is you can remove your airpump and all that junk...But when it comes time for emissions, you can bolt all that stuff back in.. Plus your cats will last longer. But dont tell any tree-huggers that I recommended that to youu..

As far as the TB mod, I cant really say, I have never performed this mod.

Rat

87racer

thanks... i appreciate it