Holley EFI

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Jun 29, 2021 | 08:18 PM

lewistg

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Mountain Pass

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Holley EFI

I am looking to swapping to a Holley Sniper. If anyone has done this, I have questions.

Jun 29, 2021 | 09:26 PM

77&79F250

Moderator & parts slinger

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From: S/W Missouri, Polk county

Jun 29, 2021 | 10:19 PM

lewistg

Thread Starter

Mountain Pass

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Quote:

Originally Posted by 77&79F250

here we go,! Thanks

Jun 30, 2021 | 02:08 PM

rotating_equipment

Mountain Pass

Joined: Jan 2019

Posts: 136

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From: Fort Bend County

Quote:

Originally Posted by lewistg

I am looking to swapping to a Holley Sniper. If anyone has done this, I have questions.

Can't say it's the best install but she starts and runs every time!

Jun 30, 2021 | 03:21 PM

FiddlyThings

Mountain Pass

Joined: Jan 2021

Posts: 141

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From: Austin, TX

Quote:

Originally Posted by lewistg

I am looking to swapping to a Holley Sniper. If anyone has done this, I have questions.

I have a sniper on my 390, and it took a lot of tweaking but now it’s quite excellent. I have heard that both Holley and Edelbrock have great hardware but questionable support staff (they don’t seem to know their product), and FiTech has great folks but a less robust product.

The instructions suck. The forums are about the only place to get real info, mostly from one guy who honestly isn’t great at communicating but has a lot of answers. There are a number of things you’ll probably need to adjust that simply isn’t well documented if at all, and you’re just following forum posts (or hiring someone at a local performance shop).

One thing people should know is that holley’s temp sending units suck and are often way off, the forums mention a much better $10 directions replacement. Well worth it since decent temp measurement is critical even for learning mode. Just speaking from experience here…

Jul 1, 2021 | 05:25 PM

EQCMCAT

Laughing Gas

Joined: Nov 2016

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From: Oxnard

I'm in the process swapping my 77 F-150, 351M/400 over to Holley 2300 EFI. The EFI is installed and I'm able to start the truck, but I'm working through a timing issue (4th attempt next), so I'm in no position to offer any advice / suggestions at this juncture.

IRT Holley's coolant temperature sensor, I mounted in it the block, passenger side front of the block, right behind the alternator bracket and the OEM temperature sensor in the goose neck. Next chance trying to get it timed should be this Saturday. Going to have to pull the Distributor to get everything lined up with number one cylinder at TDC. Done several projects before the Holley 2300 EFI swap starting just after last Thanksgiving 2020, almost eight months of back to back projects including changing the timing gear and chain. Plan to do a write-up on the EFI swap once it's running correctly.

Jul 19, 2021 | 04:31 AM

Conrad66

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Joined: Jul 2021

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Well I had an Holley EFI on my 74 f250 w/390 and ended up taking it off and went back to a carburetor. It was on the truck when I bought it and I couldn't get it to run right. Left me stranded to many times. Was always afraid to drive it. I tried to do adjustments to it and it would run ok one day and the next it would act up. I couldn't find anyone around me 6hat could help me tune it.

Jul 25, 2021 | 07:06 AM

F_in_Idaho

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Joined: Jun 2021

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From: Moscow, Idaho

For those having problems with temp sensor location, here's a nice solution I saw over on the Holley forum:

Jul 25, 2021 | 07:32 AM

#10

ranger140892

Grumpy goat

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That's a trick little spacer. Nice for getting the sensor below the thermostat so you can get readings before the thermostat opens. And it demonstrates the only known advantage in having the distributor at the rear of the engine. However, there's usually at least one port in the intake manifold that you can use. That pic shows two.

Jul 25, 2021 | 10:42 AM

#11

F_in_Idaho

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Joined: Jun 2021

Posts: 28

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From: Moscow, Idaho

Quote:

Originally Posted by ranger140892

Ya, it looks like a better solution than the in-line hose type.
I wonder if a guy could add another sensor that goes to a water temp gage to verify what temp reading the Sniper is getting. Some, maybe a lot, of people put their Sniper CTS in the original water temp location at the back of the manifold, and their old gage sensor in the thermostat block up front.
IDK, which is the better location for accuracy and function, in your opinion, aside from convenience?

Jul 25, 2021 | 05:31 PM

#12

ranger140892

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Quote:

Originally Posted by F_in_Idaho

I don't know which is better, but I like having temp sensors as high as I can get them, since that theoretically should be the hottest location. I'd probably put it in the intake manifold crossover.