What's a good AFR to shoot for on an LS2
What's a good AFR to shoot for on an LS2 Been doing some tuning myself with hptuners and an innovative lc1 wideband and have gotten to the point of finetuning the AFR and timing tables.
I've set my timing to a pretty conservative 24-26* and tuned the VE to almost perfection. Right now I have the AFR at 12.8 across the board except for 4000 or so RPM where I bump it up to around 12.65 or so for more safety at peak torque.
I don't have access to a dyno to try multiple tunes to see which setting yields better power, and I knew that when I chose to spend my money on self tuning rather than going to a pro dyno tune. So that's why I'm hear to get some input on what you guys have seen as the best place to be AFR wise.
I've set my timing to a pretty conservative 24-26* and tuned the VE to almost perfection. Right now I have the AFR at 12.8 across the board except for 4000 or so RPM where I bump it up to around 12.65 or so for more safety at peak torque.
I don't have access to a dyno to try multiple tunes to see which setting yields better power, and I knew that when I chose to spend my money on self tuning rather than going to a pro dyno tune. So that's why I'm hear to get some input on what you guys have seen as the best place to be AFR wise.
TECH Resident
Joined: Aug 2004
Posts: 875
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From: Portland Oregon
The generic standard is 12.7 will make max power, and 14.7 is best for economy. My engine with a 233/239 cam runs about 14.3 cruising, and I aim for 12.7 at WOT.
If you run 12.8 all of the time, idle and mid range, that's prety rich, it can foul spark plugs.
If you run 12.8 all of the time, idle and mid range, that's prety rich, it can foul spark plugs.
If you run 12.8 all of the time, idle and mid range, that's prety rich, it can foul spark plugs.
The 'accross the board' comment was meant for the PE table.
Are you verifying the WOT A/F ratio with a wideband O2 sensor or are you just trusting that the PE multiplier will give you the proper A/F ratio? Having said that, I have found that the LS2s are happy being a little fat. Around 12.5:1 keeps the knock sensors happy, especially around peak torque.
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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.
I usually tune for 12.3-12.8 at the peak torque number on the dyno and 12.8-13.2 at peak horsepower. I usually make 5-6 pulls and put the best numbers together in the final tuneup.
