Passing Illinois emissions
Thread Starter
Racer
Joined: Dec 2005
Posts: 325
Likes: 0
From: De Soto Illinois
St. Jude Donor '12
Passing Illinois emissions
I have a c5 z06 with 35xxx miles running strong. I picked up some xspower longtubes and x-pipe and dropped the extra ~175$ for cats thinking I'd be fine. Haven't had to test it yet. Got about a month. Since the upgrade it pops the post cat codes after the cycle (warmup, part throttle ~4k rpm acceleration and lie throttle low rpm highway acceleration).
On past cars (old supras and a trans am) I was able to easily pass the sniffer (should be more of a pita??) with hi flow cats. Now, the hit or miss spark plug anti foulers are not an option with the xspower xpipe. They go over the top. There is no space for an extension. I have the stock manifolds but not the hpipe because I used to be in Hawaii (Marines) and had no way to keep the huge thing when I got out.
Tl dr? Dong buy aftermarket cats. Useless waste of money.
On past cars (old supras and a trans am) I was able to easily pass the sniffer (should be more of a pita??) with hi flow cats. Now, the hit or miss spark plug anti foulers are not an option with the xspower xpipe. They go over the top. There is no space for an extension. I have the stock manifolds but not the hpipe because I used to be in Hawaii (Marines) and had no way to keep the huge thing when I got out.
Tl dr? Dong buy aftermarket cats. Useless waste of money.
Burning Brakes
Joined: Apr 2008
Posts: 1,050
Likes: 1
From: Bartlett IL
Got any friends that live in a no emissions part of Illinois? LOL I just had to go through this on my Jeep SRT8 with headers and no cats and ended up changing the registration to my girlfriend's parents house which don't have emissions. So just once a year, will have to go get sticker and that's that.
Race Director
Joined: Jul 2004
Posts: 10,295
Likes: 4
From: Downers Grove IL
St. Jude Donor '15
Race Director
Joined: May 2010
Posts: 16,574
Likes: 13
From: Winfield IN
Don't you just have an OBDII test to scan for diagnostic codes? If so, then all you would have to do is have a tuner delete the rear O2 sensors, I believe.
That's all we have in Northwest Indiana is the OBDII check on '96 and newer vehicles. Only '95 and older cars (non OBDII) are hooked up to the "sniffer" and put on the dyno.
That's all we have in Northwest Indiana is the OBDII check on '96 and newer vehicles. Only '95 and older cars (non OBDII) are hooked up to the "sniffer" and put on the dyno.
Le Mans Master
Joined: Jun 2009
Posts: 6,528
Likes: 752
From: South Dakota
I lived in Mesa, AZ for quite a while and really hated the emissions testing there.
I'm glad I live in the sticks too.
Instructor
Joined: Jul 2008
Posts: 133
Likes: 0
From: Champaign Illinois
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Race Director
Joined: Jul 2004
Posts: 10,295
Likes: 4
From: Downers Grove IL
St. Jude Donor '15
Don't you just have an OBDII test to scan for diagnostic codes? If so, then all you would have to do is have a tuner delete the rear O2 sensors, I believe.
That's all we have in Northwest Indiana is the OBDII check on '96 and newer vehicles. Only '95 and older cars (non OBDII) are hooked up to the "sniffer" and put on the dyno.
That's all we have in Northwest Indiana is the OBDII check on '96 and newer vehicles. Only '95 and older cars (non OBDII) are hooked up to the "sniffer" and put on the dyno.
Same in Illinois as well.
Le Mans Master
Joined: Sep 2007
Posts: 7,604
Likes: 8
From: Belleville Il
Don't you just have an OBDII test to scan for diagnostic codes? If so, then all you would have to do is have a tuner delete the rear O2 sensors, I believe.
That's all we have in Northwest Indiana is the OBDII check on '96 and newer vehicles. Only '95 and older cars (non OBDII) are hooked up to the "sniffer" and put on the dyno.
That's all we have in Northwest Indiana is the OBDII check on '96 and newer vehicles. Only '95 and older cars (non OBDII) are hooked up to the "sniffer" and put on the dyno.
Race Director
Joined: Mar 2003
Posts: 10,789
Likes: 894
From: Northern Illinois
Oldtimer
I've got all the mods listed in my signature and have never had a problem passing Illinois emissions. My problem is that my emission test is due in March and I store my car until the middle of April or so. My license plates also expire in March, which means I can't renew them until after I pass emissions. Since I only put about 700-800 miles a year on my car, I filled out the on-line EPA waiver, mailed it in with required paperwork and have a 2 year exemption on the test.
Race Director
Joined: Mar 2003
Posts: 10,789
Likes: 894
From: Northern Illinois
Oldtimer
They should be testing in Springfield because that's where all the a@#holes are.
Drifting
Joined: Oct 2006
Posts: 1,554
Likes: 13
From: Romeoville IL
Don't you just have an OBDII test to scan for diagnostic codes? If so, then all you would have to do is have a tuner delete the rear O2 sensors, I believe.
That's all we have in Northwest Indiana is the OBDII check on '96 and newer vehicles. Only '95 and older cars (non OBDII) are hooked up to the "sniffer" and put on the dyno.
That's all we have in Northwest Indiana is the OBDII check on '96 and newer vehicles. Only '95 and older cars (non OBDII) are hooked up to the "sniffer" and put on the dyno.
I have a set of LG Streets I just picked up with high flows and I'm probably going to run rear O2 simulators. For off-road use only, of course... :-)
