Solving RF Interference Issues in Sniper EFI Installations

[cmyer]

To my knowledge, they never solved the problem.

[oleblue60]

Solution?

As I mentioned, the car & customer are in Thailand, but fortunately the customer is an English speaker or else this would be impossible. Thanks again for the suggestions, I'll post what we find.

@cmyer: Perhaps I missed it, but what was your solution?

[thecowwatcher]

All you have to do is right click in the graph area and select "Mark Data Points" and you will see a dot at each data point recorded. Do this with your datalogs and you'll be amazed how bad some can be.
https://forums.holley.com/showthread...ta-Points-quot (Related Forum Thread)

[tdford5]

OK good, now I can finalize my wiring and thanks. And yes, I was going through the menu on the handheld, can you post how and where I can seen the RFI noise on my datalogs? So I can look for this myself as I start finalizing my wiring.

[thecowwatcher]

Looks good! You do have some random spots with no data for .1 second, but other than that, it's looking strong. Those data point losses could be from going through the menus on the handheld while datalogging, but I haven't seen that myself.

[tdford5]

OK after shorting my excess wires, looming my plug wires and adding ferrite beads, engine finally seems back to normal. I hope I've eliminated the FRI and/or EMI noise I had. If someone could please look at my datalog and share there thoughts, it'd be greatly appreciated. And thanks for all the input and help. https://www.dropbox.com/s/g4pp1nfj91..._0004.dlz?dl=0

[tdford5]

OK pulled Sniper/HyperSpark wires out of loom and ran them by themselves got a little better like 20%. Starts but still sputters. I going to loom up spark plug wires and get up and away from the engine block/braided hoses. I do have some extra ferrite snap on beads, snap on style. I may put them on the power wires going to the battery from Sniper system. And yes, again I should have plenty of grounds, these are my 0 AWG wire grounds (engine to chassis, engine to firewall, engine to battery, chassis to battery) so hopefully we can put the ground issues to rest here.

[cmyer]

A dumb? Can the RFI signal be carried by the stainless wrap on those hoses?
The reason I ask is, the hose lays on the plug wires, and is nearly touching the Sniper body.

Sure it can! Any time you put metal in an electromagnetic field you're going to induct power into that metal. And then there's the potential of turning that into an antenna or guide that transmits that field elsewhere. I'd remedy that situation, even if it's not the cause of your problem.

[thecowwatcher]

So after pulling out wires I have three 14 AWG power wires in the same loom as my Sniper & HyperSpark wiring, but why does Holley run there hot/ignition hot wires along with the points wire (white)? Also, does the location of the ignition box matter? I've also check my grounds currently 0 AWG OFC wire - engine to battery, frame to battery, engine to firewall. I'll add a engine to frame in the next couple days. Also, I'll loom the HyperSpark & Sniper wires by themselves, hopefully this will work

The Sniper and HyperSpark power wires go straight to the battery. The ignition wire is 12V, but low amperage.
You need to study RFI/EMI and understand transducer vs transmitter and how it relates to communication wiring. I know it sounds like a lot, but luckily we're only dealing with DC circuits here. I have Ferrite RFI Suppressors on my HyperSpark and Sniper power wires at the battery. Most likely overkill, but they are there. I have loomed all wires separate as well. The engine to frame ground should help.

A dumb? Can the RFI signal be carried by the stainless wrap on those hoses?
The reason I ask is, the hose lays on the plug wires, and is nearly touching the Sniper body.

I'd say no, but I've seen some weird stuff in my days so it could always be possible. The path of least resistance applies.

[Chuck L.]

I replaced wires as I installed new I HyperSpark system (box, coil & distributor). I know it's not the fix, but just wanted to make sure what the issue was. So MSD Street Fire Spark Plug Wire Sets 5552 is what I put on. So now is it coming from the wires or distributor? I attached a couple photos. Please don't mind the mess I wanted to make sure everything was going to work before looming all the wires. I'll take any help on how to stop this and make it work. Thanks.

A dumb? Can the RFI signal be carried by the stainless wrap on those hoses?
The reason I ask is, the hose lays on the plug wires, and is nearly touching the Sniper body.

[tdford5]

So after pulling out wires I have three 14 AWG power wires in the same loom as my Sniper & HyperSpark wiring, but why does Holley run there hot/ignition hot wires along with the points wire (white)? Also, does the location of the ignition box matter? I've also check my grounds currently 0 AWG OFC wire - engine to battery, frame to battery, engine to firewall. I'll add a engine to frame in the next couple days. Also, I'll loom the HyperSpark & Sniper wires by themselves, hopefully this will work

[Danny Cabral]

No, it can also be caused by EFI wiring too close to high voltage components (spark plug wires, ignition coil, distributor, etc.)

View from 6:52 minutes onward for more information about the datalogger "Mark Data Points" feature: https://www.youtube.com/watch?v=BQdQ...ature=youtu.be (Holley EFI Proper Grounding & Wiring Practices - Devin Vanderhoof)
Additional information for others viewing this: http://forums.holley.com/showthread....2656#post32656 (Electronic Noise Interference, AM Radio Detection - Post #53)

[tdford5]

I know I have a engine to chassis ground in the front of the engine. I believe my back ground is engine to firewall, I'll double check this evening. So it's just the lack of proper grounding the cause of RFI noise?

[thecowwatcher]

No need to ground the distributor. Just make sure all grounding points are clean and secure.

[tdford5]

I have 0 AWG grounds to chassis and to battery, to the frame, to the engine block. Should I run a ground to the distributor? I can ground whatever I need to.