Total emissions removal? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 02-20-2009, 05:00 PM   #1
Newb
Thread Starter
 
Join Date: Nov 2008
Location: Middle Tennessee
Posts: 35
Total Cats: 0
Lightbulb Total emissions removal?

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.
djmtsu is offline   Reply With Quote
Old 02-20-2009, 05:09 PM   #2
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

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.
Saml01 is offline   Reply With Quote
Old 02-20-2009, 05:13 PM   #3
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

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.
y8s is offline   Reply With Quote
Old 02-20-2009, 05:21 PM   #4
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,812
Total Cats: 187
Default

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.
thirdgen is offline   Reply With Quote
Old 02-20-2009, 05:21 PM   #5
Newb
Thread Starter
 
Join Date: Nov 2008
Location: Middle Tennessee
Posts: 35
Total Cats: 0
Default

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!
djmtsu is offline   Reply With Quote
Old 02-20-2009, 05:49 PM   #6
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

Quote:
Originally Posted by thirdgen View Post
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.
actually EGR is good and can lower combustion temps and improve gas mileage without hurting power.
y8s is offline   Reply With Quote
Old 02-20-2009, 07:22 PM   #7
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,812
Total Cats: 187
Default

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.
thirdgen is offline   Reply With Quote
Old 02-20-2009, 08:06 PM   #8
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

IMO, the main reason to delete EGR is because the fittings to adapt it to a turbo manifold are expensive
akaryrye is offline   Reply With Quote
Old 02-20-2009, 10:14 PM   #9
Elite Member
iTrader: (17)
 
Join Date: May 2007
Location: NY
Posts: 1,614
Total Cats: 2
Default

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
TonyV is offline   Reply With Quote
Old 02-20-2009, 10:43 PM   #10
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

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.
samnavy is offline   Reply With Quote
Old 02-21-2009, 12:14 PM   #11
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

Quote:
Originally Posted by akaryrye View Post
IMO, the main reason to delete EGR is because the fittings to adapt it to a turbo manifold are expensive
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.
y8s is offline   Reply With Quote
Old 02-21-2009, 12:58 PM   #12
Newb
Thread Starter
 
Join Date: Nov 2008
Location: Middle Tennessee
Posts: 35
Total Cats: 0
Default

Yes, the reason I am deleting all the emissions, cold start assist, whatever is to tidy up the bay and ease access.
djmtsu is offline   Reply With Quote
Old 02-21-2009, 01:17 PM   #13
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

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.
akaryrye is offline   Reply With Quote
Old 02-21-2009, 01:44 PM   #14
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,328
Total Cats: 1,926
Default

Quote:
Originally Posted by samnavy View Post
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.
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.
Joe Perez is offline   Reply With Quote
Old 02-21-2009, 02:51 PM   #15
Elite Member
iTrader: (1)
 
NA6C-Guy's Avatar
 
Join Date: Feb 2008
Location: Birmingham Alabama
Posts: 8,038
Total Cats: 43
Default

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.
NA6C-Guy is offline   Reply With Quote
Old 02-21-2009, 03:04 PM   #16
Newb
Thread Starter
 
Join Date: Nov 2008
Location: Middle Tennessee
Posts: 35
Total Cats: 0
Default

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.
djmtsu is offline   Reply With Quote
Old 02-21-2009, 03:06 PM   #17
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

booh come on man dont be a posser
magnamx-5 is offline   Reply With Quote
Old 02-21-2009, 03:14 PM   #18
Senior Member
iTrader: (5)
 
Join Date: Nov 2007
Location: Troy, MI
Posts: 860
Total Cats: 13
Default

Quote:
Originally Posted by Joe Perez View Post
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.
yes, but without the stock ECU grounding that solenoid at the opportune time, how are the gases being purged?
The_Pipefather is offline   Reply With Quote
Old 02-21-2009, 03:16 PM   #19
Newb
Thread Starter
 
Join Date: Nov 2008
Location: Middle Tennessee
Posts: 35
Total Cats: 0
Default

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!!
djmtsu is offline   Reply With Quote
Old 02-21-2009, 04:53 PM   #20
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,328
Total Cats: 1,926
Default

Quote:
Originally Posted by The_Pipefather View Post
yes, but without the stock ECU grounding that solenoid at the opportune time, how are the gases being purged?
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?"
Joe Perez is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
15x10 - 15x11 6UL @ 949 Racing emilio700 Wheels and Tires 151 06-02-2017 03:36 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 02:04 PM
Got bad Crank Angle Sensor and Random Misfire codes, but runs fine. Greasyman General Miata Chat 2 09-28-2015 11:44 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:01 PM.