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Old 01-30-2013, 03:51 PM   #1
Scubynubie
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Default Mild Cams and emissions - Real World Experience

I have been looking at putting in some cams with the engine build that I am starting, but I have to pass emissions where I live, and I really don't want to go to all of the trouble of putting them in to find out that I will have to pull the engine and yank them out when I have to pass emissions.

So I was wondering if there were people in California, Colorado, etc. that have passed emissions with a mild cam. Something like 272 or less duration.

I have called a couple manufacturers and they don't seem to test for this sort of thing, and that is why I am posting.

Engine would be a 2.5 liter longblock, and down-pipe would be stock for testing purposes.

Any experience or advice would be greatly appreciated.
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Old 01-31-2013, 12:14 PM   #2
FlatironsTuning.com
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Wrong Post...
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Old 01-31-2013, 12:33 PM   #3
kakarot09
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Single avcs, dual avcs, no avcs? I don't have any personal experience but it may be helpful to note for anyone who might. Have you tried contacting cosworth and fishing around? Maybe motoiq? They've done a ton of testing on engine designs and might be able to help. If you happen to do that it would be nice to post what they say.
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Old 01-31-2013, 12:47 PM   #4
sense of nature
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Most emission testing is done by OBD2 port scanning or Visual Inspection.
I would think it'd be near impossible to tell by inspection as most 272's really don't have lopey idles.
& as far as OBD2 goes, no Cel is almost always a PASS unless ur readiness monitors aren't set.
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Old 01-31-2013, 01:07 PM   #5
kakarot09
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In California and probably some other places they run the car on rollers too. Usually not a big deal for us since we have awd they make an exception for that. But maybe that's why he is asking. Where I live I just have the plug plugged in the OBD port.
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Old 01-31-2013, 01:24 PM   #6
Scubynubie
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Thanks for the help. I live in Colorado, and they test our cars on rollers with a sensor in the tail pipe, so it is the actual effect on emissions that I am concerned about. The visual would not be the issue.

And this would be non-AVCS cams going in a non-AVCS WRX. But I would be putting them in D25 heads.

I am leaning towards something that is even less aggressive like the GSC stage 1 cams, but they aren't sure how much they would effect emissions either.

I may call Cosworth as well just to see. I suppose that if someone has passed California emissions with 272 cams, then I should be okay with 266's, but you never know I suppose.

I will post back if I find anything, but hopefully someone will chime in with actual experience.
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Old 01-31-2013, 07:10 PM   #7
sense of nature
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I would "think" that that would be more tune specific in that case, if you can find out what rpm they test @ it might get u a better idea , obviously it's gonna be year & car specific , Just make sure your not running pig rich & you "should" be ok .... as long as it's not an 07 Sti.. lol
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