cam to pass smog?
Thread Starter
Joined: Oct 2005
Posts: 4,768
Likes: 26
From: Central Valley
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
Thread Starter
Joined: Oct 2005
Posts: 4,768
Likes: 26
From: Central Valley
on the cheater cam intake and exhaust lifts are more than the tr230/224 sitting in my room in the box . . . i'll still need to replace my rockers lol
Last edited by King Nothing; Jun 1, 2009 at 03:09 PM.
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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)
__________________
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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
Thread Starter
Joined: Oct 2005
Posts: 4,768
Likes: 26
From: Central Valley
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)
intake duration + exhaust duration divided by two, then subtract LSA times two.
example- MS3 237/242 113lsa
237+242=479
479/2=239.5
113 X 2 226
239.5-226=13.5 degrees of overlap
correct me if I'm wrong
example- MS3 237/242 113lsa
237+242=479
479/2=239.5
113 X 2 226
239.5-226=13.5 degrees of overlap
correct me if I'm wrong
Your car has -7 degrees overlap. According to Pat G you should pass smog right on the dot.
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.
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.