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04-15-2008, 09:51 AM | #151 |
Merci Buckets
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Yeah. Top picture is order of assembly. You can see the O2 bung in the pipe that attaches right below the cat.
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04-15-2008, 10:19 AM | #152 |
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I've seen many of the single cat setups w/ the cat much further downstream- while one could argue that might make more power???, I can't help but think the further the cat is upstream the more effective it's going to be???
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04-15-2008, 11:55 AM | #153 | |
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This is entirely possible as it takes heat to get the catalyst working. The further you go back in the system the longer it takes to start working and the less likely it is to be hot enough to work properly. One of my college professors did some case study to determine the length of time it takes an catalytic converter to start working. IIRC he determined that it takes 10 minutes of driving around to get the catalyst up to temp and working. This doesn't directly apply as it was a case study, but I think its relevant. The question is how long does it take our high-flow cats to warm up while idling before our runs? Pending how long it truly takes for one of our high-flow converters to get up to temp, we may need the car on and idling for a good 10-20 minutes before our runs to keep from throwing a code. And then I wonder how long the emissions system is programmed to wait before taking readings? Is that the real purpose of the EGT probe? Measuring temp and time and estimating when to let the O2 sensor start feeding back into the ECU? Did we just make this more complicated? |
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04-15-2008, 03:04 PM | #154 |
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04-15-2008, 03:06 PM | #155 |
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it's been complicated as soon as they came out w/ the "clarification"- the only way to make it uncomplicated is go back to the old one cat rule (my guess is that's a long shot)
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04-15-2008, 03:13 PM | #156 |
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Last edited by BIGSKYWRX; 04-15-2008 at 07:40 PM. |
04-15-2008, 04:14 PM | #157 |
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I meant making the selection of components and putting together a "legal" exhaust more complicated...not the rules.
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04-15-2008, 08:53 PM | #158 | |
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Quote:
Sure, drive around with no CELs long enough and your car should be in "ready state." As some people have posted in this thread, they've found single cat exhaust combinations that will not give them a CEL, or maybe not for many many miles or under certain conditions. So far, I don't think I've seen any single cat solution that is guaranteed to prevent CELs under all conditions for all users. The APS solution was already ruled out - someone posted earlier in this thread that the APS exhaust did eventually throw the P0420 CEL: http://forums.nasioc.com/forums/show...8&postcount=13 http://forums.nasioc.com/forums/show...1&postcount=94 Last edited by PossumK; 04-15-2008 at 09:01 PM. |
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04-15-2008, 09:24 PM | #159 |
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^ that's probably not going make Scooby921 very happy
drive around long enough w/ no CEL's * and your car should be in ready state * w/ no cel defeats/overrides/or other TomFoolery |
04-16-2008, 12:20 AM | #160 |
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It's not too hard if you have one of those one CEL in many many many miles setups. Or as McCance and Fenter were discussing a few posts ago, drive around with CEL defeats to stay CEL-free in a ready state and switch out the defeats at events. That's an option.
Last edited by PossumK; 04-16-2008 at 01:47 AM. |
04-16-2008, 09:52 AM | #161 |
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question- has anyone checked "readiness" whilst running any kind of cel defeat (mechanical or ecu)?
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04-16-2008, 06:37 PM | #162 | |
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I bought a scanner check for "readyness". You can attain readiness without 55-70mph steadystate highway driving. My observation is that the system is a little bit sensitive in that range if you don't vary your throttle position. As a result, I've concluded that my car will never throw a emission code during an autoX, but may during my highway drive if I get trapped in the sensitive speed range with a constant throttle for a minute or two. |
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04-16-2008, 06:43 PM | #163 |
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Does anyone know what the magic combination is to achieve ready status?
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04-17-2008, 09:02 AM | #164 | |
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What are the scan tools everyone is using? I suppose I need to buy one and figure out how long it takes my car to get into ready state. I may have to reset the ECU on my way to Atlanta to clear CEL's and then drive just long enough to get back into ready state. I'm not giving up hope until my car shows me a code that I didn't intentionally create. |
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04-17-2008, 09:08 AM | #165 |
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I will be found this year unclicking all of your o2 sensors in grid.
Cheers and happy motoring |
04-17-2008, 10:12 AM | #166 | |
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Quote:
http://www.amazon.com/Actron-CP9135-.../dp/B00009RAX7 Most of the monitors with be ready within just a few miles (less than 30) it's that O2 monitor thats a b*tch. I forgot to check mine again after last weekend's event, would have been a good time to check it too, 2 drivers and a long course (me running 68 seconds, other guy driving 70-72 seconds). I guess that whole me spinning out in a wide open slalom and taking out a chain link fence thing kinda threw off my concentration for the day... Good, you'll be busy then when the rest of us stop by to do the same to your car (AND unscrew your gas cap, AND unhook your EGT) Last edited by Aaron B; 04-17-2008 at 10:17 AM. |
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04-17-2008, 11:10 AM | #167 |
Merci Buckets
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04-20-2008, 11:51 PM | #168 |
Street's closed, pizza boy
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FWIW, I got my car (AFAIK) legal this weekend:
-Swapped to new Cobb STX base map (1.32) w/o CEL defeats -Reinstalled EGT sensor in uppipe -Put new TXS downpipe w/ TXS race pipe on 120 miles so far, no CELs yet. I need to get one of those scanner gizmos to test my readiness I guess, but I would say that easily 100 of those miles are freeway cruising between 45-65 mph. *crossing fingers* john |
04-21-2008, 09:11 AM | #169 |
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Well I put my car back on the road last monday. More due to the fact that it gets better gas milage than the Excursion. Although I'd hate to get rear ended in my Auto-x car.
At the time I'm running a single cat Cobb DP. It was fine last year at nationals and I had logged ~ 1000 miles prior to the event with no issue. I did move the o2 about 3" further back and put a new one in. I've now got another 250 on it since last monday, mixed driving, and haven't seen a light yet. The battery has been dead a couple times over the winter. I have a pro-tune with the CEL's enabled. |
05-28-2008, 12:51 AM | #170 | |
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05-28-2008, 08:31 AM | #171 |
Street's closed, pizza boy
Member#: 17301
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Oh yeah. Last time I checked I had well over 1000 miles and no CEL's yet. I am getting dyno'd today with the OTS Cobb map and will update after that for sure.
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05-28-2008, 09:15 AM | #172 | |
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Quote:
I'm beginning to think there may be a relationship between no CEL's and the ethanol blended gas, because that's about all you can get now. I don't know. |
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05-28-2008, 09:20 AM | #173 |
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Although it's not ideal, I have a solution that has me 2k+ miles and is still clean.
I've currently got the invidia Catted 1piece pipe, and the OEM up-pipe (isn't gutted yet). Sure, it's got an OE cat, and sure i'm starving myself, but i'm CEL free. Up-pipe is getting swapped soon, so i'll just be using the Invidia, havn't heard reports of it throwing CEL, so i'm crossing my fingers. -Chip |
05-28-2008, 09:36 AM | #174 |
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I have a factory egt probe in my uppipe and have had no problems with it dying yet.
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05-28-2008, 09:45 AM | #175 | |
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Quote:
BTW, reset the ecu a couple weeks ago, no cel's but had run some crap gas through. As of that time all the IM checks were good EXCEPT the O2 sensor. I don't even wanna say how many miles were on it... |
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