AF HP diff 12.6-13.0?
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Joined: Mar 2003
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Originally Posted by 98camaroLS1M6
About how much is there to be gained by a cam only car making 390rwhp going from 12.6A/F to 13.0A/F? About 10rwhp?
Depends on where you're measuring the A/F from. If you're sticking a probe up the tailpipe, the results may come out leaner than they really are...sometimes as much as a full point lean. That means a 13.0:1 ratio reading at the tailpipe may actually be 12.0:1 if measured from a bung just aft of the header. In this case, going from 12.6:1 to 13.0:1 measured at the tailpipe would actually be going from 11.6:1 to 12.0:1. The hp difference would probably be bigger than going from an actual 12.6 to and actual 13.0.
Also, keep in mind, most LS1s will like a little fatter mixture up to peak torque (say 12.5:1), but they seem to be a little less sensitive to A/F ratio as you approach peak hp. The power difference at 6300 between 12.6 and 13.0 may be very small.
Also, keep in mind, most LS1s will like a little fatter mixture up to peak torque (say 12.5:1), but they seem to be a little less sensitive to A/F ratio as you approach peak hp. The power difference at 6300 between 12.6 and 13.0 may be very small.
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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
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.
