nopistons3

iTrader: (1)

If the emissions are removed on a 12A, what will happen. Will performance boost, motor blow, what? Ive heard by removing emissions that the motor could not become a daily driver, or be driven 5 days a week. From what I know emissions are a way for the treehuggers to get there way. So will the 12A still be reliable if all emissions are removed???

PercentSevenC

If it's done right, you won't notice much of a difference other than how much cleaner your engine bay is. Removing the cats will free up some power, especially if they're clogged. Reliability goes up, because there's less to fail.

Starfox07

As far as I know it will run better and make more power. You have to do it right though.

Like on my car, somebody disconnected the airpump sometime ago, which only resulted in a cat that is so clogged that I'm probably down 20-30hp across the board.

Just do some searches on here, there is a wealth of info to be had.

jinxed4dub

iTrader: (7)

why don't you just hollow them out, just run a broom stick through them and tap them on the ground?

blackdeath647

iTrader: (2)

as far as performance goes, removing emissions is not gonna do TOO much, it'll free up some weight, and stress on the engine from the air pump. But it will definitely minimize the things that COULD go wrong, and clean up A LOT in the bay. but definitely get rid of the stock cats, i have an aftermarket one, and all my emissions removed and its doing great, it's been like that for about 3 years.

Starfox07

I'm getting a header...

trochoid

iTrader: (6)

You heard all this from whom? Whoever it is, I hope you don't take thier advice about cars. Removing the cats will net a small hp gain and a larger noise gain unless a rotary tolerant mufffler replaces the main cat. Replacing the exhaust manifold with a header nets the largest hp gain without getting inside the engine.

Removing emissions is illegal, but then so is speeding and spinning one's tires. Removing emissions from newer cars can cause problems since they are so integrated into engine management electronics. Fortunately we don't have that problem.

Super82

iTrader: (1)

Removing the vacuum emissions controls on the top of the keg won't net you anything but a cleaner and more simple (less headaches!!!) engine bay, but removing the cat, and subsequently the air pump, will get you some respectable power. I think removing the cat was one of the bigger HP gain I've done so far.

BTW-'gutting' out the cat is freaking retarded. You are ruining an expensive part when you can replace them with a straight pipe for cheap.

BeenJaminJames

Not necessesarily retarded, depends on what state you live in. Here in Alabama, No matter what car you have, you have to have a cat, so you just gut an old clogged one and put it on behind your headers, that way if your car ever needs to be inspected (noise violation perhaps?) they will think you have a working cat, yet you don't have the restriction of one.

trochoid

iTrader: (6)

If one's going to gut the cat, it's best to weld a straight pipe inside it. This will cut down the noise a little bit and cut down the turbulence a lot.

BeenJaminJames

hahaha I actually typed that in, but for some reason accidentally erased it before posting, thanks for throwing that in.

NCross

iTrader: (18)

Neither of my 7s have emissions. I drive them every single day. As long as your car is in tune and running good it will not spew fumes and be undrivable. Your engine will not explode. Your
MPG will stay the same.
Benefits...

-You may free up a small bit of power. ( Mostly due to the air pump being removed or replacing a clogged or restrictive cat with a pre-silencer or straight pipe ). Get a header, preisilencer, and high flow muffler for even more power.
-You will reduce lots of weight.
-You will clear out a lot of room in the engine bay.

That's it really. Do it right and it will run the same as before if it was running good with emission equipment.

The bad...

-You will NEVER pass emissions.
-You will have a tough time reselling the vehicle to someone who lives in an emissions testing county.
-Depending on how strict your state or county is, you could get in trouble with the law for tampering with emissions.
-Shops can get fined like $10,000 to work on an emissions tampered vehicle.

Starfox07

Damn I'm glad I live in Texas. After 25 years, all I need is a quick check of the brakes and that nothing is falling off the car and I'm set.

PercentSevenC

Heh, I don't even need that. I mail them a check and they mail me my tabs.

rxtasy3

iTrader: (2)

yes....and look alot better.

White81Z28

iTrader: (4)

What if you leave the emissions on the car, would getting another cat help with anything? How do you tell if its clogged or not?

NCross

iTrader: (18)

Take it off and inspect it. It should look like a honey comb. You should be able to see clearly through it (well, not perfectly...) If you can't see light shining through one side to the other its melted and crumbled. Replace with a stock replacement cat. Very easy to do and you can get out under $100. Takes about 30 minutes if you know what you're doing. OR... save your pennies and buy a Racing Beat header and presilencer. That will eliminate all exhaust emissions parts.

PercentSevenC

If you do this, it's critical that you get the muffler, too. Otherwise, your car ends up sounding like mine does right now. Which isn't a particularly good thing.

nopistons3

iTrader: (1)

Well sweet! I already have the cats removed straight pipe with a baffled magnaflow...sorry...only muffler I had lyin around.Doesnt sound to bad though, but I do now have the original muffler that is in good condition that Im gonna put on and remove the magnaflow. I want it to sound like it would stock, figure with the cats out and the original muffler it should help with performance.
Thats awesome that I can remove emissions and still have good driveabilty. In a couple of weeks I will probably do that when I get extra cash.
Is the "how to remove emissions" good and reliable also from the website? I already have it printed just have to get the parts and wait for a non rainy sunday in indy.
Thanks

NCross

iTrader: (18)

Leave the aftermarket muffler intact. Factory muffler sounds windy and metallic after you open up exhaust flow. Plus it's pretty restrictive and you will gain a small bit of power from a high flow muffler.

My car started off no emissions, Weber side draft, Pace Setter header --> 3 inch straight piping --> Megan fart can. It made decent power, but it sounded terrible. Driving down the interstate was like WAAAAAAAAAAAAAAAA!!!!! POP POP POP!!! constantly.

I then bought a factory exhaust minus the manifold and silencer. So I was running a Pace Setter header --> OEM heat exchanger --> OEM connecting pipe --> OEM muffler. Sounded raspy, rattly, windy, metallic. Not terrible... but not impressive at all. Pretty dinky.

My current setup...

Simplified Nikki, no emissions, Racing Beat carb top and foam filter, Pace Setter header (heat wrapped and re-welded), Racing Beat mini pre-silencer, OEM connecting pipe, Racing Beat muffler.

Sounds great! It freed up some obvious power. It even feels quicker with the Nikki despite the Weber flowing better. Not too loud, but a little louder. No rasp. Very smooth. Full of bass.


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As for the emissions removal. Carl's tutorial is good. He just doesn't explain about the float bowl vent much. If plugged incorrectly your car will flood gasoline into the throttle body and boil making it hard to start and smoky.

My advice, just take a large vacuum hose to the bowl vent ( driver side of the carb, on the top. Has a single wire plugging into it. Keep the wire.) then loop it over the engine and let it dangle loose under the car. Fasten it to something with a zip tie. Keep it clear of heat, exhaust or electrical parts. It will have gasoline vapors coming out of it while parked.

I also ditched the crank case vent parts and made my own. I ran a large vacuum hose from the filler neck to the carb hat. The carb hat will suck and pull the extra pressure out of the crank case. I put a small fuel filter on it as a safe guard. I've put 3000 miles on it since this and no problems at all. No lung mustard in the filler neck. Always starts. Never floods or stalls. Never smokes. MPG actually went up.

nopistons3

iTrader: (1)

Thanks everyone for all of the insight. I will definitely say I will never get rid of this rx7, and will keep it rotary powered. When I get extra money I will rebuild the spare 12A I have sittin and make one hell of a 1st gen RX7