Hey guys I need some input. I did a TBI/TPI swap. Took out the 305 TBI and in it's place put the setup listed below. Now I ordered a custom prom to run this and I can't get the car to run. So I took out the custom chip put in the old 305 chip and have had it running for 2 mins. It seems to want to run better with the old chip even with the camshaft. Give some suggestions on problem areas, I know the cam is horrible for TPI, so should I change the cam and see if it runs, get some larger injectors, get a 350 prom...... or what. Tell me what you think.

1992 Camaro RS
25th Anniversary Heritage Edition
Red with Black

Stock TH700R4 Transmission
Stock Stall Converter
Stock Suspension
15" wheels, 225 tires front, 245 tires rear

1968 327 2 bolt main block
10:1 compression
bored .030 over (that puts it at 331 c.i.d)
ground .010 on the mains
TRW hypereutectic pistons
hi- perf seals, moly rings, bearings, rods, rod bolts,
frost plugs, ect.
ARP bolts through out
double roller timing set with thrust button
hi-perf oil pump and drive
baffled oil pan
291 casting heads
64 cc chambers
1.94/1.6 valves (3 angle grind)
1.52 roller rockers
pushrods, guideplates, screw in studs, guides, ect.
polished and ported
camshaft 220/231@.050, 468/480 lift, 110 lsa

1991 Speed Density TPI
Ported, Polished, Siamesed Plenum and Intake
Stock Runners
48mm Throttle Body
19# Injectors
Adjustable Fuel Pressure Reg
350 Knock Sensor
170* stat

Heddman 1 5/8" Longtube Headers with 3" collector
No cat
3" exhaust

the EGR deleted,
the temp at which the fan comes on lowered,
the VATS disabled (going from TBI to TPI, might be a problem ),
the RPM for the VSS extended as I want to rev

 

You might be better off posting this in the DIY tuning forums, but the VE tables is where I would start. Larger lift and longer duration make low RPM VE (Volumetric Efficiency) go down. Lower these numbers a bit, then test it while watching your BLMs. Guessing by the lift/duration given, I wouldn't be surprised if you need a 20% or more change in some areas across the RPM range. Without a dyno with wideband O2 readout, scanner software, or your own wide band O2, you're just going to be stabbing in the dark. Good luck.

 

I did her. I got her to idle at 750 in park and I was using the stock 305 chip and 19lb. injectors. She is one mean engine!!!!