Holley 650 Rich at idle! Help appreciated...
11-30-2013, 07:36 AM
#11
4th Gear Member
Join Date: Nov 2013
Location: arizona
Posts: 1,398
67mustang302: Thanks for the confirmation on my thoughts there.
All: I just had a thought: now that we've already established that the "rich" idle may not actually be rich, but just 'reading' rich, then if my WOT reading is 10.8:1, then what is the possibility that I'm actually running leaner? The reason i ask is that if I actually am running 10.8:1 at WOT then i would like to jet my secondaries a little smaller pushing for 11.5:1. BUT, if I'm pressuring the intake charge, and the intake and exhaust valves overlap, then could my o2 sensor be returning a richer reading? Should I leave well enough alone?
I really, and I mean REALLY, don't want to blow my engine due to detonation. I'm already at 33* total timing at WOT with about 7 lbs of boost at 5500 rpm. I can't hear any pinging, but i'm not sure if I should push it. Recommendations anyone?
All: I just had a thought: now that we've already established that the "rich" idle may not actually be rich, but just 'reading' rich, then if my WOT reading is 10.8:1, then what is the possibility that I'm actually running leaner? The reason i ask is that if I actually am running 10.8:1 at WOT then i would like to jet my secondaries a little smaller pushing for 11.5:1. BUT, if I'm pressuring the intake charge, and the intake and exhaust valves overlap, then could my o2 sensor be returning a richer reading? Should I leave well enough alone?
I really, and I mean REALLY, don't want to blow my engine due to detonation. I'm already at 33* total timing at WOT with about 7 lbs of boost at 5500 rpm. I can't hear any pinging, but i'm not sure if I should push it. Recommendations anyone?
ok now you say you have a supercharger.
what is your current jetting?
might be around 67 front 72 rear.
your 6.5 power valve is close enough.
LOWER END - do you have steel crank, hyper or forged pistons and forged rods and a thick heavy damper?
BOOST AMOUNT - i ran around 14 lbs boost at 6500 rpm on a 302 with around 9.5 compression and a comp xe262h cam. pulled like a 428 above 5k.
HEADS - Unless they are gt40p's not std gt40's and they are heavily ported you are leaving a lot of hp on the table.
INTAKE - You also need a good flowing intake.
IGN TIMING - You might not want max timing until around 3000 rpm with the supercharger.
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