View unanswered posts | View active topics It is currently Fri Mar 29, 2024 12:33 am



Reply to topic  [ 10 posts ] 
 LT1 Cam and emissions 
Author Message
Junior Forum User

Joined: Sun Mar 15, 2009 6:15 pm
Posts: 19
Location: Scarborough
Reply with quote
Post LT1 Cam and emissions
Just wondering what people have been able to pass emissions here with. I have a 96 so it will have to go through the 2 speed idle test. I am in the process of ordering a cam from AI, however, they are unfamiliar with the emission requirements here and wanted me to let them know what cam specs will pass. As I am not too knowledgeable about this, I was hoping some of you guys could chime in. The cam will be going into a stock bottom end with aftermarket ported heads if that makes any difference. Thanks!


Wed Apr 22, 2015 6:29 pm
Profile
CCFBG Club Member
User avatar

Joined: Fri Mar 03, 2006 8:52 pm
Posts: 1164
Location: Drayton
Reply with quote
Post Re: LT1 Cam and emissions
I had a 230/230 .600 lift 112lsa that passed with the old system. The limits are higher now too. It will depend on the pcm tuning forsure. I set my idle to 1150 rpm to smooth things out for the test. I had longtubes with 2 full size magnaflow cats.

_________________
Image


Wed Apr 22, 2015 7:14 pm
Profile
Operations Team
User avatar

Joined: Tue May 03, 2005 5:27 pm
Posts: 3072
Location: Oshawa
Reply with quote
Post Re: LT1 Cam and emissions
Keeping your intake and exhaust duration around 230 and make sure its cut on a 112lsa to keep the idle quality better. I passed with a 223/230 112lsa and the idle turned up. Im sure if AI ran there common 226/234 grind with a 112lsa over the 110lsa it would pass with good tuning.

_________________
1969 Firebird Sprint OHC 6 - 250ci/M5
1995 Trans Am - Blue Green Chameleon - 350ci/A4
1994 Fire-Am - Polo Green - 355ci/M6 380rwhp: SOLD


Wed Apr 22, 2015 8:55 pm
Profile WWW
Forum Moderator
User avatar

Joined: Thu Mar 17, 2005 10:28 pm
Posts: 5900
Location: Center of the Universe
Reply with quote
Post Re: LT1 Cam and emissions
I passed emissions with an XFI 292 8)

_________________
http://forums.kwmuscle.com/viewtopic.php?t=4238&start=0 Laughing at dumb dumbs since Oct 03/11
Alex IROC Z-28 wrote:
Ohhh lord....here we go..... Hawk one time kicked Chuck Noris ass so bad that Chuck Noris filed for Workers Comp......

Image


Thu Apr 23, 2015 2:16 am
Profile
CCFBG Club Member

Joined: Sat Mar 19, 2005 8:15 am
Posts: 3233
Location: Mississauga
Reply with quote
Post Re: LT1 Cam and emissions
That will depend on What compression you have. LT1s get away with it because of its cooling and some L98 because intake and pistons were nodded with it. IMHO 9.5:1 compression is the minimum for a 220+/230 duration(.050) that will make you pass easily..


Thu Apr 23, 2015 5:22 am
Profile
Junior Forum User

Joined: Sun Mar 15, 2009 6:15 pm
Posts: 19
Location: Scarborough
Reply with quote
Post Re: LT1 Cam and emissions
Thanks a lot for the responses! Hopefully this will help me with getting my cam spec'd out.


Thu Apr 23, 2015 5:31 pm
Profile
Senior Forum User
User avatar

Joined: Sun May 13, 2007 10:48 am
Posts: 984
Reply with quote
Post Re: LT1 Cam and emissions
TRUTHINESS

LOL

_________________
1987 IROC ww 99 LS1,TR224/112, STG2 heads ported by American Speed, P Gold springs, LS6 intake, SVO 30's, Ported TB, Comp Cromo Push rods, Katech Rod bolts, LS6 oil pump, T56, SW LT's, 8.8 hybrid rear 3.73, 275/40/17 MT ET streets, lots more
12.1 @ 112 mph 1.69 60'

89 R7U 1LE Players Challenge car all stock.


Fri Apr 24, 2015 12:04 pm
Profile
Junior Forum User

Joined: Sun Mar 15, 2009 6:15 pm
Posts: 19
Location: Scarborough
Reply with quote
Post Re: LT1 Cam and emissions
Ended up getting spec'd a 220/230-112 grind. Can't wait till it gets here!


Sun Apr 26, 2015 8:12 am
Profile
Operations Team
User avatar

Joined: Tue May 03, 2005 5:27 pm
Posts: 3072
Location: Oshawa
Reply with quote
Post Re: LT1 Cam and emissions
Heres something to keep you tied over till the parts get here 8)

https://www.youtube.com/watch?v=qMk2cN7EHEA

_________________
1969 Firebird Sprint OHC 6 - 250ci/M5
1995 Trans Am - Blue Green Chameleon - 350ci/A4
1994 Fire-Am - Polo Green - 355ci/M6 380rwhp: SOLD


Mon Apr 27, 2015 8:21 am
Profile WWW
Junior Forum User

Joined: Sun Mar 15, 2009 6:15 pm
Posts: 19
Location: Scarborough
Reply with quote
Post Re: LT1 Cam and emissions
If mine sounds even half as good I'll be happy! Where did you get it tuned if you don't mind me asking?


Fri May 01, 2015 11:28 pm
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 10 posts ] 

Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware for PTF.