cam to pass smog?
06-01-2009, 02:37 PM
#1
cam to pass smog? i know the 224/224 will pass but is that the highest that will pass smog (especially here in california) i just pulled off my lt's last week and am now back to stock but have a tr230/224 brand new sitting in the box in my room i can't use without lt's and plus i know that won't pass a sniffer lol so cam gurus any suggestions on a different spec?
ps i used the search icon but it wasn't very helpful
ps i used the search icon but it wasn't very helpful
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06-01-2009, 05:29 PM
#11
The general rule of thumb is -7 degrees of overlap at .050" will pass smog every time. -4 degrees might pass, but the cats need to be really good and the tune needs to be razor sharp. 0 degrees of overlap at .050" almost NEVER passes.
TR 224 on a 114LSA = -4 degrees (maybe pass)
TR 230 on a 111LSA = 5 degrees (dirty, no way pass)
TR 220 on a 114LSA = -8 degrees (definitely pass)
215/230 on a117LSA CheaTR = -11 degrees (definitely pass)
TR 224 on a 114LSA = -4 degrees (maybe pass)
TR 230 on a 111LSA = 5 degrees (dirty, no way pass)
TR 220 on a 114LSA = -8 degrees (definitely pass)
215/230 on a117LSA CheaTR = -11 degrees (definitely pass)
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
06-01-2009, 05:37 PM
#12
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How do you know what the overlap is? On my cam card it doesn't have overlap or do I not know what to look for?
221/221 114+4 cam
561/561
in open @.050 .5btdc CL 40.5ABC
ex 48.5BBC -7.5ATC
221/221 114+4 cam
561/561
in open @.050 .5btdc CL 40.5ABC
ex 48.5BBC -7.5ATC
06-01-2009, 05:53 PM
#13
The general rule of thumb is -7 degrees of overlap at .050" will pass smog every time. -4 degrees might pass, but the cats need to be really good and the tune needs to be razor sharp. 0 degrees of overlap at .050" almost NEVER passes.
TR 224 on a 114LSA = -4 degrees (maybe pass)
TR 230 on a 111LSA = 5 degrees (dirty, no way pass)
TR 220 on a 114LSA = -8 degrees (definitely pass)
215/230 on a117LSA CheaTR = -11 degrees (definitely pass)
TR 224 on a 114LSA = -4 degrees (maybe pass)
TR 230 on a 111LSA = 5 degrees (dirty, no way pass)
TR 220 on a 114LSA = -8 degrees (definitely pass)
215/230 on a117LSA CheaTR = -11 degrees (definitely pass)
06-01-2009, 06:06 PM
#16
Sorry for all of the posts. Isn't it a lot easier to just pay $300 every few years and have the power/setup you really want? I ask this because I'm moving back to NorCal in 6-7 months. I see a lot of Cali Tech members with signatures that would never pass smog. Good luck.
06-01-2009, 06:29 PM
#19
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Sorry for all of the posts. Isn't it a lot easier to just pay $300 every few years and have the power/setup you really want? I ask this because I'm moving back to NorCal in 6-7 months. I see a lot of Cali Tech members with signatures that would never pass smog. Good luck.