here's what i have a stock 350 bottom end,afr 195's stock cam with 1.6 rockers approx 10-1 comp and a paxton sc puting out 6psi boost right now cant get my o2 levels over 750 with the stock injecters and 70 psi fuel pressure.have a fmu but dont want to add it and overtax the fuel pump if bigger injecters and a new chip would result in better driveability any ideas?the rest of my mods are in my sig!
thanks

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1990 Trans Am,350 TPI(L98),WS6suspension ,bridgestone RE71's /245/45/zr16
paxton supercharger, alston sfc's,msd 6AL-BTM,
8.5 superconductor wires SLP 1-3/4 headers,duel cats,3"slp exaust, lakewood LCA's,T.B.Bypass
160 degree stat,alum driveshaft,fiberglass wing, secret mods

"if you cant win fair CHEAT"

 

i would say 27-30lbs

 

Do you have a stock fuel pump? 70 psi is pretty high for a stock pump and stock injectors. At that pressure you may be losing some injector response and hurting drivability. At high pressures the stock injectors don't deliver fuel as efficiently as they might at a more normal pressure. I would go with 24#, or 30# if you plan on future mods. Also get an aftermarket pump if you are still using the original stock pump. You may also want to be sure the filter inside the tank isn't collapsed on the fuel pickup, mine did this and I ran real lean until I removed the filter. I am using 24# injectors, Bosch hi-flow pump, and DFI on my 383 and I finally got the O2 numbers where I want them. If you still have the stock chip I'd certainly replace that with a custom chip.

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'85 IROC, 383, SuperRam, Accel DFI, 300+ ign, KB, DART, Crane 2050 & 1.6 rr's, Accel afpr, Bosch fp, 700R4 w/ Hughes 3000 conv., Flowmaster, SLP 1 3/4" headers, Denny's shaft, Richmond 3.73, Auburn Pro Series, KONI, Eibach, Hotchkis, Jamex seats, ZR1 wheels.
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'89 Camaro RS, bone stock (L03)