Cats and performance
08-30-2005, 04:19 PM
#1
Cats and performance There is a good chance I will be moving to a state that is far less inspection friendly than where I am at now, and am thinking about what it will take to get the T/A to pass inspection. I was thinking about this combo:
AFR 205 heads with 63cc chambers - would end up about 10.5:1 compression
Stock 2001 manifolds and cats feeding the Hooker catback
224º / .581" / 114º / +4º cam
I would hope to make 400/385 at the wheels or better, but am not sure how much the cats are going to choke it. The motor is a typical 347.
AFR 205 heads with 63cc chambers - would end up about 10.5:1 compression
Stock 2001 manifolds and cats feeding the Hooker catback
224º / .581" / 114º / +4º cam
I would hope to make 400/385 at the wheels or better, but am not sure how much the cats are going to choke it. The motor is a typical 347.
08-31-2005, 03:22 AM
#5
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look up your local laws. i passed the mirror test with just cats and no other emissions devices installed. the tech even looked under the hood and didnt say a word about the blocked off emissions hookups.
09-01-2005, 08:16 PM
#7
Very hard to get over 400 rwhp on stock manifolds and cats and still be emissions compliant. To do it, you'll need more compression from the AFRs and a more emissions friendly/manifolds & cats friendly camshaft. Something like the Thunder Racing CheaTR.
I made 411 rwhp through stock manifolds and cats with this cam, but I spent a bundle doing it.
I made 411 rwhp through stock manifolds and cats with this cam, but I spent a bundle doing it.
__________________
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.
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.
