Let's see if we can give this thread legs! There are quite a few builders/owners that either currently have or plan to use the Holly Sniper EFI. I'm one of them, and I'd love to learn how to tune the system. I'm ready to be the tester of your expert advice and document what I learn in this thread. So, if you have already gotten over the learning curve and would like to help teach me (and others) the ropes, let's get started.

First, some basic information about my engine:

BluePrint Engines (BPE) 347 purchased in 2017:

Fuel Delivery:
- Fuel Injected, Holley Sniper EFI

Manifold:
- Edlebrock Polished Air Gap

Ignition/Distributor:
- MSD

Block:
- 302ci, 2 bolt main, bored .040
- 1-piece rear main seal

Rotating Assembly:
- Cast steel crank
- 3.4” stroke and Forged 5.4” rods
- 150,000 psi rod bolts
- Forged pistons
- Hastings Moly rings
- Balanced rotating assembly
- High volume oil pump
- Hydraulic roller camshaft
- Heavy duty double roller timing set

Heads:
- BluePrint Performance Aluminum
- 58cc chamber
- Hardened retainers and springs
- 2.02 swirl polished intake valves
- 1.60 swirl polished exhaust valves
(BP Aluminum Head Part# HP9009)

Cam Specs:
- Roller, .543 Intake
- .554 Exhaust & 218 Intake
- 226 Exhaust duration @ .050 - 112 degree lobe separation

My car has been on the road for less than 1000 miles and runs pretty well. The idle is set at 900 rpm, and if possible, I'd like to bring that down a bit as long as the car continues to run well at a lower idle speed. While driving, any lift of the accelerator results in popping in the exhaust. I don't mind a little crackle, but it's excessive as it stands right now and I'd like to clean that up. My measured fuel economy on the highway for one trip put me at about 14 mpg, which I can definitely live with. However, if I can keep the performance and get a little more range on a tank of gas, I'd welcome that, too.

To date, I haven't done any data logging, but I can share some captures of my base fuel map, and learning map.

Base Fuel Map:



Base Fuel Graph:



Learn Fuel Map:



The Decel Fuel Cutoff control is currently disabled by default. I've read that the base fuel table should be finished before enabling this control.



Once I do enable it, what parameters would I want to start with? It seems that the defaults of 0 would engage this control as soon as I lift on the accelerator and would reenable fuel at any RPM above idle. I've also read that this control only triggers when the rpm is above 3000, so it may not fully address my decel popping issue which is happening at pretty much any rpm.