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Re: Holley Sniper EFI on 401

Posted: Sat Oct 21, 2017 8:00 am
by KJ Ryu
I didn't take a lot of pics but, here's a link to my postimage folder: https://postimg.org/gallery/172qyktsk/

Re: Holley Sniper EFI on 401

Posted: Wed Nov 15, 2017 7:44 pm
by az chip
Would not let me see pics.

Re: Holley Sniper EFI on 401

Posted: Fri Nov 17, 2017 7:17 pm
by KJ Ryu
Let me know if this works for you.

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Re: Holley Sniper EFI on 401

Posted: Fri Nov 24, 2017 8:42 pm
by az chip
Thanks for doing that. Those I see fine.

Re: Holley Sniper EFI on 401

Posted: Sun Jan 14, 2018 4:59 pm
by az chip
What did you do with the PCV system?

Re: Holley Sniper EFI on 401

Posted: Thu Feb 15, 2018 12:17 am
by KJ Ryu
az chip wrote:What did you do with the PCV system?
Sorry for taking so long to reply. I didn't do anything with it. PO installed the intake manifold and mangled... err, I mean removed the emissions stuff. But, I'll get some pics and what-not asap (this weekend, probably). Not even sure it is correct, tbh.

On a positive side note, there was one good thing about ordering direct from Holley: I get a free t-shirt for writing a review!

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Re: Holley Sniper EFI on 401

Posted: Sat Apr 21, 2018 8:14 am
by posulli88
What did you end up using for your 12v source (hot with ign on and cranking)? Installing mine this weekend and its the only part I am struggling with to find. Thanks!

Re: Holley Sniper EFI on 401

Posted: Sun Apr 22, 2018 7:14 am
by KJ Ryu
I used a red wire with a white trace on it. I thought it went to the electric choke but, looking at the diagram on oljeep, it seems to be the coil+. Someday, I may need to rewire the whole thing, so I know for sure.

The PCV valve is plumbed directly to manifold vacuum, at the base of the throttle body. Like I said, probably not right but that's how it was before I got it.

Re: Holley Sniper EFI on 401

Posted: Wed Aug 08, 2018 5:18 am
by FSBOB
I know I'm a couple months late on this thread but if you're looking to rewire your truck think about contacting Z & M Jeep. He's got new wiring harnesses specifically for 79 J-Trucks. The only thing I found that wouldn't work in my 76 was the washer fluid and wiper wires. In 79 they ran the hot wires to the switch and grounded through the wipers/fluid pump. Previous to 79 it's opposite. A little reverse engineering on that one issue and all of the wiring in my truck is brand new and working great. Did cost somewhere in the range of 1k though.... Just something to think about when you get to that place.

Re: Holley Sniper EFI on 401

Posted: Mon Jul 29, 2019 1:24 pm
by KJ Ryu
Small update: I installed a progressive link on my Sniper, yesterday. At the same time, I also replaced the filler hose. When I did that, I realized how much better my mileage has gotten, as a LOT of gas came out when I unhooked the old hose even though I've driven it quite a bit since the last fill up.

My handheld display needed updated but the EFI's ECU did not. The truck is definitely easier to accelerate from a stop and reacts very nicely when the secondaries open up. This is what I was originally expecting from EFI. Very happy with this system now!

I got a much nicer looking bend than the one in the instructional video, too.

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Re: Holley Sniper EFI on 401

Posted: Sun Aug 11, 2019 4:56 pm
by Jeepin87
KJ Ryu wrote:Small update: I installed a progressive link on my Sniper, yesterday. At the same time, I also replaced the filler hose. When I did that, I realized how much better my mileage has gotten, as a LOT of gas came out when I unhooked the old hose even though I've driven it quite a bit since the last fill up.

My handheld display needed updated but the EFI's ECU did not. The truck is definitely easier to accelerate from a stop and reacts very nicely when the secondaries open up. This is what I was originally expecting from EFI. Very happy with this system now!

I got a much nicer looking bend than the one in the instructional video, too.

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Are you referring to a progressive link on the throttle? If so I've been trying to figure out what is required for this, I don't like how all 4 butterflies open at once. I would expect more linear throttle input and possibly better mpg as well. Please share part numbers and software/parameter changes if possible!

Re: Holley Sniper EFI on 401

Posted: Mon Aug 12, 2019 12:03 pm
by KJ Ryu
https://www.efisystempro.com/sniper/sni ... inkage-kit

This company includes a copy of the instructions with each linkage, as well as having it on their website. I had to update my handheld display but the TBI's ECU was ready to go.

Holley Sniper EFI on 401

Posted: Sun Dec 05, 2021 2:55 pm
by Moosehead
Installed the adjustable EFI System pro progressive link this morning. Getting the OEM cotter pin out was a bit tricky so removed the Sniper TB to make it easier to remove original.

Note EFIP recommends starting the adjustable progressive link on its shortest setting, but in my setup that caused the secondary butterfies to hold open a bit putting idle RPM’s at 3900. I backed it off so both linkages stayed in same static start position and she purred like a kitten. The progressive throttle is much nicer for daily driving though you need to get on the pedal to beat old ladies at the stoplight.

Adjustable link at shortest setting keeps secondary TB open a bit:

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Backing off a bit so both linkages unaffected at zero throttle:

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Butterflies fully closed at no throttle with adjustment backed out a bit.

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