https://www.holley.com/products/ignition/hyperspark_ignition_for_sniper_efi/parts/565-312 seems like a pretty good setup if going the holley EFI route. Anyone have any info on this setup? Im looking to do the entire package this way. Including the Holley fuel tank for my 482 build.
I don’t, but I’m following. Looking for a EFI / distributor combo to install on the pro touring project
Just installed the Holley complete EFI system. 4150 with spreadbore adapter plate, Hyperspark Buick distributor, Hyperspark CD box, Hyperspark coil, and external Walbro fuel pump system. My only additional purchases were a brass sleeve for the temp sensor, a new throttle cable kit, and new MSD 8.5 super conductive wires. I opted for the 4150 vs. the quadrajet version for 3 reasons: 1) Holley support - both factory and in the forums vs. the quadrajet version, 2) compatibility /adaptability to other platforms and intakes, and 3) resale ability if the Sniper didn’t work, 1969 Jeepster Commando with an early 1970s Buick GS motor, 4-speed Muncie 465 with overdrive. I installed the fuel system earlier for a Chevy 350 TBI conversion. In addition to the wide band O2 sensor bung already welded in, the fuel lines were plumbed -all I needed to do was swap out the fuel pump from a 14 PSI unit to a 60 PSI unit. Otherwise, it took me one day to remove the TBI and install the Sniper hardware, and one day to wire it. Yeah - only about 12 wires, but routing, shielding, and connecting properly (tinned and shrink-wrapped) took a fair part of one day. I used the quick install instructions included with the kit, nothing else. The distributor is beautiful. (mine’s shiny black billet). It drops right in. Plug wires to the HEI will drop right onto the new dizzy, and there’s a lockdown ring. All of my plug wires run in looms along the side of the valve covers. Apparently, the Holley system can be susceptible to RMI, so keeping plug wires away from the EFI system was already complete. I mounted the CD box in the cabin, and the billet coil on the fender well (again, foe RMI purposes, not next to the Holley throttle body.) The connectors, if you purchase the entire Holley EFI kit, leave you with only 12 connections to wire: 2 battery positive, 3 battery grounds, fuel pump positive and negative (relay wiring comes with system), 3 ignition connections (hot in ignition and start), 1 coil signal (white wire) for CD box to dizzy, and 1 tach signal. I turned the ignition on, and the handheld came alive. I followed the instructions, selected my engine cylinders (8), displacement (350), and cam type (stock/mild), and selected the Hyperspark distributor system, I programmed 34 for WOT timing, 25 for idle timing, (initial plus vacuum), 42 for cruise timing (conservative), and 13 for crank timing (initial). This corresponded to the HEI with full manifold vacuum settings of 13 initial, 21 mechanical , and about 12 vacuum that worked so well for me with the quadrajet. I set cold idle at 1250, and hot idle at 750. Sorry for the delay: it started right up on the second crank! vroom! I let the system get up to operating temperature, and let it start “learning.” First thing I noticed: no rich fuel smell at idle on initial start... bonus! After about 15 minutes, I put it in gear, and drove around the neighborhood. The throttle response and crispness was magical. The system is unbelievably simple to install, and it works. Update: After reading some other EFI threads on this forum, I downloaded the Holley Sniper software to my laptop, and thanks to Trond Jarle Pedersen in Norway (on this forum), I got his Holley Sniper tune, which made my Buick run even better!!! Going to run it for about a week and data log, and see where I can make improvements to the AFR targets snd timing. Note: I ran a Chevy 350 TBI system for about a year. It worked great, but the tune wasn’t the best for my application, and even with a modified onboard computer that allowed me to burn chips for it, it is 35+ yr old technology, which requires a mastery of old-school EFI tuning. I simply was not going to ever get there... Again: I followed the “quick install” instructions, and did not consult a computer, YouTube video, or Holley forum until after it was running... I’m fairly computer-savvy. I’ve developed plenty of msexcel charts and graphs to manipulate data. I just don’t like to do it on my hobby... That being said: downloading a tune to an adapter card snd popping it into the handheld was Barney-style plug and play for me.
