Ive been tuning with my speedpro for a while now and am curious as to what others think about air fuel. In my air fuel table I have idle ratios around 14.2-1 and my wot at torque peak around 12.7-1 leaning out to around 13.1-1 near hp peak. Cruise is around 14.0-1. I have heard many different things and have learned to give the motor what it wants. But shouldnt cruise ratios be around 14.7-1? I tried it and the engine just doesnt run as smooth. Also should wot ratios be richer?

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87z 383,afr 190's, comp hyd roller(242/248-.540/.562,114 sep),Ported and polished mini ram, 30lb inj, 3.42 gears, tremec 5spd, , 1,3/4" slp headers, speed pro bank to bank-wb02.
"Just remember children, no man can beat you once youv'e found the cliterous." 'chef'

 

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"..maximum power at an air fuel ratio of 12.6:1 or best fuel economy at 15.4:1, but for A/F ratios below or above these values no performance gain is achievable."
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http://www.holley.com/HiOctn/TechSer.../FMFITch2.html

http://www.mummbrothers.com/SRF_Stuf...e/Air_Fuel.htm

if you're running with cat, you should use 14.7 as much as possible.

hope that helps

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Pontiac Trans Am GTA'89

CC1 GW6 G80 JG1 L98 MXO N64 WS6 822

 

This is what tuning is all about.
Finding out what YOUR engine likes best.
**My calibration** uses 14.7 at idle to base all further corrections on that, ie highway cruise. At WOT uses 12.25, which I double checked with a WB, and Plug readings. Reguardless of what you do you need to veriify things with plug readings. WBs and K/Ss are fine for a pure stockl application, but you can beat them at times