TR220 passed CA emissions...barely
05-12-2005, 06:51 PM
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TR220 passed CA emissions...barely This was a close one.
Took the 98 in for a smog check this morning for registration renewal. Little worried about the visual and the sniffer. After 10 long minutes the tech said I passed.
Mods are:
TR220 114LSA
TTS LTs w/cats
LS6 intake
Lid
Dual/Dual
Dyno tuned
What has me concerned are the hydrocarbons.
HCs Max. Meas.
15mph 51 47
25mph 35 30
CO and NO readings were well within limits. I had entertained the idea of adding some AFR heads to the above combo but now I am not so sure. Would heads affect emissions by much, especially if I bump up the compression ratio some?
High HCs I'm thinking are due to a rich condition. Maybe I need to have the tune redone, fan settings returned to stock, and see what happens. Car was driven for a good hour prior to testing. Any suggestions or recommendations?
Thanks,
Brian
Took the 98 in for a smog check this morning for registration renewal. Little worried about the visual and the sniffer. After 10 long minutes the tech said I passed.
Mods are:
TR220 114LSA
TTS LTs w/cats
LS6 intake
Lid
Dual/Dual
Dyno tuned
What has me concerned are the hydrocarbons.
HCs Max. Meas.
15mph 51 47
25mph 35 30
CO and NO readings were well within limits. I had entertained the idea of adding some AFR heads to the above combo but now I am not so sure. Would heads affect emissions by much, especially if I bump up the compression ratio some?
High HCs I'm thinking are due to a rich condition. Maybe I need to have the tune redone, fan settings returned to stock, and see what happens. Car was driven for a good hour prior to testing. Any suggestions or recommendations?
Thanks,
Brian
05-13-2005, 12:31 PM
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Originally Posted by Rick@Synergy
Who tuned the car? I have had more radical cams pass smog with no problems. That cam is small.
Rick
Rick
05-13-2005, 12:35 PM
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Originally Posted by Lithium
Rick, how big of a cam have you got to pass? I bought a 224 114, and I am wanting to atleast go with 112 lsa instead.
Keep in mind with cats and good tuning.......
Our 226/226 112lsa passes,
our 226/230 114 lsa passes.
I have even got a stock cam with long tubes and no cats pass smog. Go figure eh?
Rick
05-13-2005, 06:27 PM
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Hey guys,
Rick, I had Mike Morgan (E-tune, MMS) dyno tune the car last year. I think I will try and hook up with Jeff Creech from CAM the next time he pays a visit out this way. Hell, maybe if I get some time off I might visit you up in NorCal. I'm always up for a good road trip.
As far as the visual, the tech didn't even question the headers. I think he was satisfied with the CATS being on the car. With regards to the intake, as you guys know you can't really tell the difference between an LS1 and LS6 intake. Since my car is a 98 and has EGR, I bought an LS6 intake with the EGR provision.
Brian
Rick, I had Mike Morgan (E-tune, MMS) dyno tune the car last year. I think I will try and hook up with Jeff Creech from CAM the next time he pays a visit out this way. Hell, maybe if I get some time off I might visit you up in NorCal. I'm always up for a good road trip.
As far as the visual, the tech didn't even question the headers. I think he was satisfied with the CATS being on the car. With regards to the intake, as you guys know you can't really tell the difference between an LS1 and LS6 intake. Since my car is a 98 and has EGR, I bought an LS6 intake with the EGR provision.
Brian
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05-14-2005, 11:06 PM
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HC is unburned or partially burned fuel. Yes, it can happen under lean conditions or inproper timing, but my guess would be the valve overlap on the exhaust stroke.
compression in and of itself will not create more HC. However, a less restrictive head could potentially allow more fuel air charge to pass the exhaust. AFR is probably a good choice here 'cause their heads pass emissions certification for aftermarket performance and have an executive order assigned. Funny they dont mention that in the forum as I would have purchased AFR instead of PP had I known.
1/2 way through tuning I checked my car several times (same TR220 cam) and had better than average emissions while the stock cats were in place. However running Random Tech cats/y-pipe caused HC to skyrocket up to 51ppm. Shallow victory. RT only sells cats for off road use, so I was not surprised. LT headers will have little if any effect on HC at the 1800-2000 rpm's that emissions testing occurs (assuming the LT are really tuned.)
compression in and of itself will not create more HC. However, a less restrictive head could potentially allow more fuel air charge to pass the exhaust. AFR is probably a good choice here 'cause their heads pass emissions certification for aftermarket performance and have an executive order assigned. Funny they dont mention that in the forum as I would have purchased AFR instead of PP had I known.
1/2 way through tuning I checked my car several times (same TR220 cam) and had better than average emissions while the stock cats were in place. However running Random Tech cats/y-pipe caused HC to skyrocket up to 51ppm. Shallow victory. RT only sells cats for off road use, so I was not surprised. LT headers will have little if any effect on HC at the 1800-2000 rpm's that emissions testing occurs (assuming the LT are really tuned.)
05-14-2005, 11:11 PM
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Originally Posted by Rick@Synergy
Keep in mind with cats and good tuning.......
Our 226/226 112lsa passes,
our 226/230 114 lsa passes.
I have even got a stock cam with long tubes and no cats pass smog. Go figure eh?
Rick
Our 226/226 112lsa passes,
our 226/230 114 lsa passes.
I have even got a stock cam with long tubes and no cats pass smog. Go figure eh?
Rick
What are your tuning at 15 and 25 MPH to lower HC? Injectors, O2's?
05-14-2005, 11:13 PM
#13
Originally Posted by SSpeedracer
What catalytic convertors? OEM?
What are your tuning at 15 and 25 MPH to lower HC? Injectors, O2's?
What are your tuning at 15 and 25 MPH to lower HC? Injectors, O2's?
05-14-2005, 11:13 PM
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Originally Posted by SSpeedracer
HC is unburned or partially burned fuel. Yes, it can happen under lean conditions or inproper timing, but my guess would be the valve overlap on the exhaust stroke.
05-14-2005, 11:18 PM
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1blown-
What brand cats? I'm starting to think catalytic convertor manufacturer has more influence on emissions compared to the tune.
On stock cats I got:
15mph max 51 mine was 7
25mph max 35 mine was 5
It makes since as the stock cats are more restrictive and will not allow as much scavenging out of the cylinder compared to high flow cats. Also, the stock cats tend to have more surface area and help burn off the HC's.
What brand cats? I'm starting to think catalytic convertor manufacturer has more influence on emissions compared to the tune.
On stock cats I got:
15mph max 51 mine was 7
25mph max 35 mine was 5
It makes since as the stock cats are more restrictive and will not allow as much scavenging out of the cylinder compared to high flow cats. Also, the stock cats tend to have more surface area and help burn off the HC's.
05-14-2005, 11:20 PM
#16
Originally Posted by SSpeedracer
1blown-
What brand cats? I'm starting to think catalytic convertor manufacturer has more influence on emissions compared to the tune.
On stock cats I got:
15mph max 51 mine was 7
25mph max 35 mine was 5
It makes since as the stock cats are more restrictive and will not allow as much scavenging out of the cylinder compared to high flow cats. Also, the stock cats tend to have more surface area and help burn off the HC's.
What brand cats? I'm starting to think catalytic convertor manufacturer has more influence on emissions compared to the tune.
On stock cats I got:
15mph max 51 mine was 7
25mph max 35 mine was 5
It makes since as the stock cats are more restrictive and will not allow as much scavenging out of the cylinder compared to high flow cats. Also, the stock cats tend to have more surface area and help burn off the HC's.
05-14-2005, 11:21 PM
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Originally Posted by ataylors
I did a car with LT's and a TR224 on a 112 with only one cat and it passed no problem, it for sure is not the overlap.. It is the tune.
I'm open for suggestions and here to learn. What function of the ECM did you tune?
05-14-2005, 11:24 PM
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Thanks for the replies so far.
Like I had mentioned earlier the next time Jeff Creech is in the area I will have him take a look at the tune. I have heard good things about his tuning and what 1BlownV8 has stated above seems to back that up. If not Jeff then maybe Rob over at Strictly Performance.
So I guess maybe I will re-entertain the thought of getting the heads. I just wish I had a little more margin for error with regards to the HCs.
Brian
Like I had mentioned earlier the next time Jeff Creech is in the area I will have him take a look at the tune. I have heard good things about his tuning and what 1BlownV8 has stated above seems to back that up. If not Jeff then maybe Rob over at Strictly Performance.
So I guess maybe I will re-entertain the thought of getting the heads. I just wish I had a little more margin for error with regards to the HCs.
Brian
Just noticed that a couple of you are in my neck of the woods. I'm currently in Corona.