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Old 09-07-2020, 09:39 PM   #1
PowerLineman
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Default Emissions issues with TGV/EGR deletes...CT

I’m considering doing TGV/EGR deletes when I install my new TMIC. Is there any emissions issue even when protuned. I live in CT where emissions are pretty strict. Thanks
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Old 09-08-2020, 09:26 AM   #2
Mike1Juliet
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Quote:
Originally Posted by PowerLineman View Post
I'm considering doing TGV/EGR deletes when I install my new TMIC. Is there any emissions issue even when protuned. I live in CT where emissions are pretty strict. Thanks

IIRC Connecticut does sniff testing which will pretty much make an EGR delete impossible. I don't believe a TGV delete will make you fail emissions but you gotta find other people who have WRX's in Connecticut. People in california definitely mod their WRX's and are emissions compliant so you could start there as well. Are there any well known tuners in Connecticut? Otherwise your first lookup would be Bren Tuning in Upton Massachusetts and get their opinion I'm sure they've done Connecticut cars.

Do you have ethanol near you? That'd be the best bang for your buck performance gain. Other than that you should include a Grimmspeed Electronic Boost Control Solonoid too which will help reduce the fluctuation in boost.
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Old 09-08-2020, 09:45 AM   #3
arghx7
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http://ctemissions.com/test-procedur...er-obd-testing

it sounds like they just plug into the OBD port. As long as you have your diagnostic monitors ready (can be checked with an OBD scantool or app) and no check engine light, it should pass. So you need a tune to account for it. Then it's up to the inspection station to do a visual inspection, and that will depend on the knowledge and thoroughness of the station.

Tailpipe sniffer tests depend on the cycle. If it's an idle or steady state test (fixed speed on a dyno), you should be ok as long as the cat is working and the engine is warmed up. If it's an IM240 test (a whole transient cycle on a dyno involving accelerations, the most difficult of all tests, not that common), it could be a lot harder to pass having any mods that involve a tune or change to boost/AFR.

None of these tailpipe tests involve an actual cold start like a real government certification test. You will do better though if the engine is still warm before they run the test; so that means getting there and being first in line/not waiting.
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Old 09-08-2020, 12:06 PM   #4
PowerLineman
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Thanks for the replies. I did contact Bren and they said it wouldn’t be a problem and I am going use them to do my tune(dyno).
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Old 09-08-2020, 12:17 PM   #5
Elbert Bass
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Quote:
Originally Posted by Mike1Juliet View Post
IIRC Connecticut does sniff testing which will pretty much make an EGR delete impossible. I don't believe a TGV delete will make you fail emissions but you gotta find other people who have WRX's in Connecticut. People in california definitely mod their WRX's and are emissions compliant so you could start there as well. Are there any well known tuners in Connecticut? Otherwise your first lookup would be Bren Tuning in Upton Massachusetts and get their opinion I'm sure they've done Connecticut cars.

Do you have ethanol near you? That'd be the best bang for your buck performance gain. Other than that you should include a Grimmspeed Electronic Boost Control Solonoid too which will help reduce the fluctuation in boost.
looks like sniff test only applied to diesel/heavy truck. They perform OBDII.
http://ctemissions.com/test-procedur...er-obd-testing.
Curious as to why you think EGR affects a sniff test? Most sniff tests are at idle and EGR is NOT applied at idle.
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Old 09-08-2020, 12:42 PM   #6
Mike1Juliet
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Quote:
Originally Posted by Elbert Bass View Post
looks like sniff test only applied to diesel/heavy truck. They perform OBDII.
http://ctemissions.com/test-procedur...er-obd-testing.
Curious as to why you think EGR affects a sniff test? Most sniff tests are at idle and EGR is NOT applied at idle.
I was under the impression that a lot of people didn't do EGR because of emissions regulations and under the assumption that CT had virtually copied CA emissions regulations. I know that a lot of California WRX owners won't touch the EGR or tuners won't touch it because of this and their yearly emissions testing. So I made an incorrect inference that the logic would also apply to CT.

Also this was my understanding of EGR's
https://www.delphiautoparts.com/usa/...w-troubleshoot
Quote:
The EGR valve has two primary settings: open and closed, although the position can vary anywhere in between. The EGR valve is closed when the engine is starting up. During idle and at low speeds, only a small amount of power is required, and therefore only a small amount of oxygen, so the valve gradually opens - it can be up to 90% open at idle. However as more torque and power is required, for example during full acceleration, the EGR valve closes to ensure as much oxygen enters the cylinder.
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Old 09-08-2020, 03:06 PM   #7
arghx7
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that's kind of a general description of an EGR valve that mostly applies to older cars. On those cars the EGR valve pulls hot exhaust from the manifold and flows it into the combustion chamber. The inert gases reduce combustion temperatures and lowers NOx emissions. Those older systems typically use a poppet style valve and vacuum to operate. At one point in California you'd basically have emission inspection technicians applying vacuum to the EGR valve on cars to see if it works. This is mostly true on pre 1996 OBD I cars that may not have had an ECU smart enough to detect a leak or a stuck valve.

On the FA20DIT the EGR gases flow through a cooler, similar to a modern diesel, and the exhaust gases are primarily used to improve fuel economy. It's controlled electronically. The ECU can diagnose whether it's stuck or clogged.

See this thread https://forums.nasioc.com/forums/sho....php?t=2687550

Last edited by arghx7; 09-08-2020 at 03:11 PM.
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