pinging and cant add timing HELP
08-14-2013, 02:15 PM
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pinging and cant add timing HELP
so i dropped off my truck at the dyno yesterday and today i get a call saying that he cant add more than 13 degrees of timing at WOT because of pinging.
its a ls 383 with prc 5.3 stage 2.5 heads 63cc combustion chambers, cometic .040 gaskets, flat top pistons, fast lsxrt intake, 57 lb/hr injectors, lt headers and thats about it. if im right my compression ratio should be around 11.2-11.5:1 and on 91 octane i should be ok. now i am running a vette filter on a square fuel rail. would the internal regulator have something to do with this? tuner thinks i installed the cam wrong or i have more compression than i think i do. i installed the cam dot to dot. i am about to set this truck on fire. i need ideas to fix this.
its a ls 383 with prc 5.3 stage 2.5 heads 63cc combustion chambers, cometic .040 gaskets, flat top pistons, fast lsxrt intake, 57 lb/hr injectors, lt headers and thats about it. if im right my compression ratio should be around 11.2-11.5:1 and on 91 octane i should be ok. now i am running a vette filter on a square fuel rail. would the internal regulator have something to do with this? tuner thinks i installed the cam wrong or i have more compression than i think i do. i installed the cam dot to dot. i am about to set this truck on fire. i need ideas to fix this.
08-14-2013, 02:48 PM
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What are your full cam specs? DCR (dynamic compression ratio) is a big factor.
Strange that they can't get any more than 13 degrees without and I am guessing they actually here it pinging?
Strange that they can't get any more than 13 degrees without and I am guessing they actually here it pinging?
Last edited by 03klugss; 08-14-2013 at 03:25 PM.
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08-14-2013, 03:58 PM
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the one thing i have noticed is that when it started to ping the throttle was over half open and the intake starts to collapse on itself. im wondering if as its collapsing if its causing a lean condition by leaking by the o-ring between the upper and lower intake parts.