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Holley Sniper |
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dkrtgood
AMC Addicted Joined: Jun/27/2011 Location: St Pete, FL Status: Offline Points: 1371 |
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Posted: Jan/05/2022 at 2:01pm |
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Purchased 4150 Sniper EFI and the Hyper Spark efi controlled distributor and will be installing into my new motor and was curious if anyone out there has installed both? Looking for any ideas or tips.
70 390 10:1, 292H, Stick car, Torker with mods These things self learn but I know it can be tuned to add fuel, timing etc to give the most power and best mpg.
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Dave Goodwin
President of Tampa Bay AMC 70 Mark Donohue BBO 390 5-speed 77 Matador Coupe AKA "The Beave" 70 Javelin 360 / Auto - BBG |
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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I've got both in my AMX. -Steve-
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pit crew
Supporter of TheAMCForum Joined: Jul/08/2007 Location: delete Status: Offline Points: 5341 |
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My suggestions are: Keep all wires as far from the ignition wires as possible. They can pick up interference. Pay close attention to the instructions on O2 sensor placement. Use a return fuel line. An in tank fuel pump keeps the pump cool and cuts down on the noise. For better street manners consider changing the throttle linkage to progressive instead of locked. I have mine set to 30%. Find someone with the laptop cable and use the Holley tuning software to smooth out the timing curve. Out of the box it defaults to stair step timing instead of a real curve. Go out an have a lots of fun with it. |
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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dkrtgood
AMC Addicted Joined: Jun/27/2011 Location: St Pete, FL Status: Offline Points: 1371 |
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Plan to do all that...but never heard of the progressive throttle What is the advantage? I bought the usb cable and have Software loaded on laptop and learning as much as I Can on it before I swap motor out. Thanks for the info and yeah i need to buy cd box also
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Dave Goodwin
President of Tampa Bay AMC 70 Mark Donohue BBO 390 5-speed 77 Matador Coupe AKA "The Beave" 70 Javelin 360 / Auto - BBG |
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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I've got the Hyperspark CD box, pretty much the same as MSD but all the connectivity is built in. After you get it installed give the system time to learn. Don't whack the throttle aggressively, the system doesn't have the fuel map populated out of the box. -Steve-
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troutwilly
AMC Addicted Joined: Sep/14/2007 Location: Carriere, MS Status: Offline Points: 992 |
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dkrtgood, x 2 what pit crew said. I have almost the exact setup as you, except on a 304. But its not on the street yet. And I'm already switching to in-tank pump, but because of reasons other than heat. And I googled "progressive throttle linkage" cause I didn't know either, and basically it brings in the secondaries a little later than the stock setup. Another something I may be doing.
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Bill O.
70 AMX |
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pit crew
Supporter of TheAMCForum Joined: Jul/08/2007 Location: delete Status: Offline Points: 5341 |
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Not really required but it does keep you from having to feather the throttle at stop signs and red lights. It is more of a "comfort" thing than a performance issue. Cuts down on jackrabbit starts. I would suggest you try it with the "locked" linkage first as you can always add the progressive linkage later. If your thinking about going the progressive route keep in mind you have to tell the software you are doing so and what the percentage is. There are good instructions available through Holley and several EFI websites. The Holley part number is 20-122. Oh, one last thing. Make sure you have full (100%) throttle travel. If you should ever flood the engine you can floor the throttle, hold it there, and then crank the engine. When the Sniper see 100% throttle on startup it assumes your clearing a flood condition and will keep the injectors turned off. Trust me, if you ever let an old timer drive your car they will pump the throttle on startup just out of habit and could cause a flood condition. Ask me how I know. LOL. This is also covered in the Holley instructions.
Edited by pit crew - Jan/06/2022 at 8:30am |
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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blue68AMX
AMC Apprentice Joined: Dec/17/2011 Location: East Coast, FL Status: Offline Points: 123 |
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I am thinking about doing the same thing to my 70 AMX and would like to know how you did the in tank pump with out cutting up the trunk floor.
Thanks Al
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Al
70 AMX 72 V8 Gremlin X |
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dkrtgood
AMC Addicted Joined: Jun/27/2011 Location: St Pete, FL Status: Offline Points: 1371 |
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thanks for all the replies and info, will check into that progressive linkage. sounds like a smart thing to do.
Also I see you can install a knock sensor so it can back off timing if it senses ping...anyone install or take advantage of that option? They say to install in an open port on block (Say the coolant drain down bottom of block by pan) and it will listen for a certain frequency noise. Sounds like you could run better advance and then it can back down if needed on the fly.
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Dave Goodwin
President of Tampa Bay AMC 70 Mark Donohue BBO 390 5-speed 77 Matador Coupe AKA "The Beave" 70 Javelin 360 / Auto - BBG |
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cone
AMC Addicted Joined: Apr/17/2010 Location: pennslyvania Status: Offline Points: 568 |
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I have one on my 401 and it far from "self learning". Unless you are good with computers, which I'm not, it is a pain in the rump to tune right. One of the injector fell out of place, I guess it is a common problem because there is a fix for it on youtube using zip ties. I still have a pinging issue I'm working on. If you have a manual tranny starting off without squealing the tires can be tricky because all four barrels open up at the same time. So I bought the progressive linkage but you then have to reprogram system to use it and I could not figure out how to do it so I called Holley and they told my the system isn't designed for that linkage. They sell an extension arm that attaches throttle linkage and that helped.
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1987 J20, 87 Grand Wagoneer,70AMX,
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