Charger 770
Well-Known Member
Guys Im trying to dial in the tune and Im thinking I need more IFR than the .032" that I have now.
From experience, what would be the best starting point for all 8 IFRs on a 572 Hemi with an Indy tunnel ram. Cam is 274/282 @ .050 with an endurance lobe, .660/.640" lift, idling around 1150-1200 in gear hot with around 10" vacuum.
i. Im trying to attain a hot, in gear idle AFR in the low 14s which the engine seems to like..... at my idle rpm in gear its rich at 12.0 with the mixture screws at around 1 turn out. If I turn them in it does'nt change the AFRs as much.
ii. If I apply load to it on the brake and add rpm tfrom 1500 - 2200 rpm it goes WAY lean then dies with .032" IFRs, and .067" IABs. Tried IABs on either side of this but same deal.
Sooooo......I'm leaning toward needing more IFR fuel then tweaking the IAB.
Theres a few Hemi guys with tunnel rams on her so can any of you guys add their suggestions and what IFRs / IABs to get it close and not waste too much time. I have bleeds and IFR jets.
Oh and carbs are 2 circuit not 3.
Thanks !
From experience, what would be the best starting point for all 8 IFRs on a 572 Hemi with an Indy tunnel ram. Cam is 274/282 @ .050 with an endurance lobe, .660/.640" lift, idling around 1150-1200 in gear hot with around 10" vacuum.
i. Im trying to attain a hot, in gear idle AFR in the low 14s which the engine seems to like..... at my idle rpm in gear its rich at 12.0 with the mixture screws at around 1 turn out. If I turn them in it does'nt change the AFRs as much.
ii. If I apply load to it on the brake and add rpm tfrom 1500 - 2200 rpm it goes WAY lean then dies with .032" IFRs, and .067" IABs. Tried IABs on either side of this but same deal.
Sooooo......I'm leaning toward needing more IFR fuel then tweaking the IAB.
Theres a few Hemi guys with tunnel rams on her so can any of you guys add their suggestions and what IFRs / IABs to get it close and not waste too much time. I have bleeds and IFR jets.
Oh and carbs are 2 circuit not 3.
Thanks !
