I've decided to put EFI on my 400 c.i.d. Holley Sniper? MSD Atomic? FiTech? Others? I'd love to hear your thoughts on which brand YOU would or do use, and any differences in installation, performance, etc.
Holley Sniper all day everyday and twice on Sunday. I’ve installed 5 units on various builds are they just plain work. The install is very easy, looks great, and IMO has the best tuning / self learning software on the market. The sniper also has the best looking digital control screen. It has inputs and outputs to wire in electric fans (2), a/c idle kick, a/c wot shut down, nitrous, boost control, 2 step, launch control etc. And if you’re not using any of that it’s just a simple 4 wire hookup. Batt +, Batt -, key on acc 12v, and tach out. It will also work with any ignition including old school points, HEI, or CDI box like an MSD 6al etc. It can also be setup to control the timing on a normal msd distributor, just have to buy the phasing rotor. Then the computer will control idle timing, vacuum advanced timing when cruising and WOT timing all while blending them together smoothly while transitioning. The tuning is self learning. That’s the greatest part. After a couple hundred miles after first start you just update the learing table to the base map (1 button) and the learning will eventually trend toward 0% and you know the car is pretty much fully tuned. You can also set AFR targets for idle, cruising, and WOT. It’s amazing to sit in the car, make a pull, change the AFR and timing target and make another pull and feel the results real time. As opposed to making a pull, driving home, taking the primary and/or secondary float bowl off, rejetting, loosening the distributor getting out the timing gun etc. Its really an amazing product. Also things like cold start fuel enrichment, coolant temp enrichment, accelerator pump enrichement and about 50 other settings can be fine tuned for your application. And no more pumping the pedal to get ur car to start. It has a self priming feature... Hit the key and go.
I put one on a customer’s car recently that’s a 77 trans am with the Pontiac 400 and he has been in love it. It runs smoother, has more power, and never has any cold start or hot start issues ever.