djmtsu

Has anyone done a complete emission system removal from their Miata?

I currently run my 7 with absolutely no emissions, no cold start assist or any of that BS that gets in the way of a tidy engine.

I have searched around but have not found anything here about the process, or what can and cannot be thrown out.

If nobody has done it, then I guess I will. I am documenting my rebuild anyway, so I might as well make a DIY of sorts.

Any smog **** can move to Kali. I'm in TN and don't care.

Saml01

iTrader: (9)

92 Miata, you could probably toss everything. It doesnt return OBD 2 codes and all it has to do is pass a sniff test. So unless you have a visual inspection you need to pass, get rid of everything.

y8s

iTrader: (8)

dunno if the stock ECU will throw codes or put you in some kind of limp mode that way, but a megasquirt would fix that problem quick.

that said, I have to breathe your air.

thirdgen

iTrader: (26)

The county I like in doesn't have emissions, but some in PA do. Where I live, it's just a visual, but the guy who inspects my **** doesn't check. I have everything on my car that was factory emissions, except I have no cats. I did get a CEL when I took them off, (simple simulator fix) but then again my car is a 99 and have OBD2. I think as long as you don't have do deal with emissions, take all the **** off. It shouldn't change anything as far as the way your car runs.

EGR (Exhaust Gas Recirculation)- like taking a drag from a cigarette and then inhaling the 2nd hand smoke cause the government doesn't want it in the atmosphere.

djmtsu

Forgot to add that, it will be MS'd.

I am just curious as to where the best places will be to pull the boost signal once all the useless vacuum lines are gone. I guess Bell chose the best when the designed the turbo kit, but sometimes that isn't the case.

No emissions test for me!

y8s

iTrader: (8)

actually EGR is good and can lower combustion temps and improve gas mileage without hurting power.

thirdgen

iTrader: (26)

Good point. I still have my EGR hooked up on my car. I wonder what would happen to my gas mileage if I blocked it off. I'm not tryin it though just to prove a point, I'm just a bit curious since you said something. I don't see EGR as a power robbing thing..I mean it's not like having a smog pump, which would be something more the engine would have to drive; thus robbing power. I also feel that deleting the cats is an increase due to less restriction...similar to putting a larger diameter exhaust on. As far as EGR, I think removing this wouldn't make a difference, so why do it? Let well enough alone.

akaryrye

iTrader: (5)

IMO, the main reason to delete EGR is because the fittings to adapt it to a turbo manifold are expensive

TonyV

iTrader: (17)

I'd be interested to see what you do if you go the full delete route..
My reasoning would be to tidy up eng bay/free up some room as well

samnavy

iTrader: (7)

The '92 doesn't have EGR, so that doesn't apply.

The only 2 items that really constitue "emissions" devices would be the charcoal canister and the cat. I'm not sure if there was such a thing as a 49state car in '92, but if there was, it might not have a charcoal canister. It certainly had a cat.

I suppose a PCV valve might also be "emissions" related, and there are a dozen different ways to go about keeping/deleting it depending on how your particular setup goes.

There are 2 common places to source a boost signal to your ECU. The first is to put a T in the small line that feeds the fuel pressure regulator bolted to the back of the fuel rail. I subscribe to the "shorter vaccum lines are more accurate", so that's what I do.

Additionally, there are 2 small ports on the front of the manifold directly behind the throttle body. One is for your charcoal canister, the other for cruise control. I use one of those for my BOV and cap the other since I have no CC and deleted the charcoal canister.

y8s

iTrader: (8)

on my 01, it's just a two bolt flange. that's pretty damn simple.

oh wait, you mean the exhaust. yeah that's different. i sawed the one off my stock mani and welded it on the turbo mani.

djmtsu

Yes, the reason I am deleting all the emissions, cold start assist, whatever is to tidy up the bay and ease access.

akaryrye

iTrader: (5)

Yes, it has been done. on my 90, I removed the charcoal canister, and removed the catalytic converter ... thats about all the emissions there was. Combined with removed PS and AC made for a lot of room in there.

Joe Perez

iTrader: (8)

My '92 was originally delivered in either OH or IN (can't remember which offhand) and it has a charcoal canister. It doesn't hurt anything, so it's still there.

NA6C-Guy

iTrader: (1)

I dont see the big deal with the emission controls on a Miata, especially compared to those on an RX7. When I look in my engine bay, I certainly dont see anything overly cluttered like with my old 7 (before I also did a full emissions delete, then sold it because I couldnt make it run worth a ****). I say at most remove the charcoal canister and let it go. Even with MS I wouldnt go without the EGR system or any other system on the car.

djmtsu

New direction.

I just got a 1.8 for nothing! So it is getting swapped in. I am picking it up on Monday, and ordering the FM swap kit today.

I guess that means I will be selling off the BEGi 1.6 kit that is on it now.

This is probably a better direction anyway. This is now going to be my wife's fun car, and the turbo stuff would make it a little hairy for her.

magnamx-5

iTrader: (7)

booh come on man dont be a posser

The_Pipefather

iTrader: (5)

yes, but without the stock ECU grounding that solenoid at the opportune time, how are the gases being purged?

djmtsu

The 1.8 will get boosted eventually, maybe a year from now.

I just need to get this on the road by Deals Gap Rotary Rally in April. Then after the summer I can start to turbo it.......again.

Patience!!

Joe Perez

iTrader: (8)

Did I say it was operational? I just said it was there. And the inspector can see that it is there.

Seriously- I don't like the look of "cleaned up" engine bays. I can't say why exactly, they just don't look right to me. Too much empty space and it looks like something is missing I suppose. Like "I know that the engineer who designed this intended for there to be something in that spot- where is it?"