Holly Sniper EFI..how to do it right - Chevelle Tech
EFI Caution: Beyond here be monsters...

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post #1 of 15 (permalink) Old Apr 6th, 20, 7:24 PM Thread Starter
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Pat
 
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Holly Sniper EFI..how to do it right

It seems the Sniper is getting some of the best reviews as far as efi setups. What is the proper way to go to do it right and cut no corners on the install?

I am very seriously thinking about this project for fall/ winter but would like to go ahead and start part gathering in the near future..
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post #2 of 15 (permalink) Old Apr 6th, 20, 8:59 PM
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Chris
 
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This is Very vague question.

My advice, use the coil driver for simple ignition install.

Use the on board timing system not a divorced one

Hookup every function you possibly can

Use and program all functions possible including there safety’s

Make sure all connections are correct.

I personally prefer a in-tank fuel pump setup, but many have been successful with external frame mounts up to 550hp.

Big advocate of Holley sniper systems, my super sniper has worked flawlessly!

1968 Beaumont
540 BBC + 15psi Boost via Single Garrett GTX
Stock looking, and fairly stock sounding
HP and ET not determined yet!

Boosted Beaumont Build:

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post #3 of 15 (permalink) Old Apr 6th, 20, 9:11 PM Thread Starter
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Pat
 
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The gas tank was one of my main areas i was curious about. Is it better to buy a new tank set up for efi or mount externally.

I see vids of how to do it on a budget
Not that i have money to burn but I do it I will want to do it right
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post #4 of 15 (permalink) Old Apr 6th, 20, 11:52 PM
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Mark
 
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Re: Holly Sniper EFI..how to do it right

Tanks Inc tank, or similar, is the way to go. It is very quiet. Make sure that you use a large feed wire sized for the load. Solder as many connections as you can, and add a bunch of grounds. Holley is very adamant about grounds. Take your time, and read the manual several times. Also, Holley has several general instruction video's.

It isn't terrible to install, so don't worry and have fun.
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'69 Chevelle SS (Back to NOT ON THE ROAD NOW!
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post #5 of 15 (permalink) Old Apr 7th, 20, 12:15 AM
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Re: Holly Sniper EFI..how to do it right

wire routing is one thing too holley tells you cross signals can and do happen. so route your wires accordingly.
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78 Malibu, 402, th350, holley sniper EFI, 9" 3:70.
69 VW baja 1679cc. stick shift toy.
96 chevy 1500, tow vehicle.
04 scion XB daily driver.
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post #6 of 15 (permalink) Old Apr 7th, 20, 12:19 AM
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Re: Holly Sniper EFI..how to do it right

Quote:
Originally Posted by Pats70ss View Post
The gas tank was one of my main areas i was curious about. Is it better to buy a new tank set up for efi or mount externally.

I see vids of how to do it on a budget
Not that i have money to burn but I do it I will want to do it right


bang for the buck I went with the B-Body gas tank swap. these are efi tanks. the fuel sender is compatible with our stock style gauge readings. the pumps are 240lph which will support up to 600hp in a 3/8" fuel line. as well there 24gal, so you get some extra capacity. HDPE aka plastic construction is lighter and does not attract heat like a metal tank will. and last kicker is they have some awesome baffling in the tank.


you can pick these up at the wrecking yard for mayby $100 probably less now days. worth looking into
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1968 Beaumont
540 BBC + 15psi Boost via Single Garrett GTX
Stock looking, and fairly stock sounding
HP and ET not determined yet!

Boosted Beaumont Build:

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post #7 of 15 (permalink) Old Apr 7th, 20, 8:28 AM Thread Starter
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Re: Holly Sniper EFI..how to do it right

A lot o folks say that if your carb is running good, let it alone, and mine is running fine but I am always looking to tinker and EFI just seems like a good step. I am not looking for big HP gains but would do it simply for the fact that you can just hit the key like a modern car and it fires up and the consistency of the system once its dialed in.
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post #8 of 15 (permalink) Old Apr 7th, 20, 8:57 AM
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Re: Holly Sniper EFI..how to do it right

Have you looked at Edelbrock Pro Flo 4. This is the easiest to tune. Self learning is very fast plus its true MPFI with timing control included.
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post #9 of 15 (permalink) Old Apr 7th, 20, 9:09 AM
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Re: Holly Sniper EFI..how to do it right

Quote:
Originally Posted by Pats70ss View Post
A lot o folks say that if your carb is running good, let it alone, and mine is running fine but I am always looking to tinker and EFI just seems like a good step. I am not looking for big HP gains but would do it simply for the fact that you can just hit the key like a modern car and it fires up and the consistency of the system once its dialed in.
This is exactly why I bought a Sniper… I am not especially looking for more "hp" but if there is, well good… but the main reason is, like you said "the fact that you can just hit the key like a modern car and it fires up" It'll be a great improvement since my carburetor has no choke on it and it's sometimes requires a little "dancing" on the throttle pedal in the morning.

Claude.

1971 Chevelle SS
1987 Buick Grand National 9.48 @ 142 mph
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post #10 of 15 (permalink) Old Apr 7th, 20, 9:48 AM Thread Starter
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Re: Holly Sniper EFI..how to do it right

Quote:
Originally Posted by StevenS View Post
Have you looked at Edelbrock Pro Flo 4. This is the easiest to tune. Self learning is very fast plus its true MPFI with timing control included.

will look into this one Steve! I like the "easiest to tune part"
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post #11 of 15 (permalink) Old Apr 7th, 20, 9:49 AM Thread Starter
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Re: Holly Sniper EFI..how to do it right

Quote:
Originally Posted by toofastforyou View Post
This is exactly why I bought a Sniper… I am not especially looking for more "hp" but if there is, well good… but the main reason is, like you said "the fact that you can just hit the key like a modern car and it fires up" It'll be a great improvement since my carburetor has no choke on it and it's sometimes requires a little "dancing" on the throttle pedal in the morning.

Claude.

Same here Claude, no choke and do the throttle dance every time I start it. I am ready to embrace new technology..LOL
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post #12 of 15 (permalink) Old Apr 7th, 20, 10:34 AM
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Re: Holly Sniper EFI..how to do it right

does your carb have a choke? gerts rid of the toe-tapping.

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post #13 of 15 (permalink) Old Apr 7th, 20, 1:16 PM
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Re: Holly Sniper EFI..how to do it right

I just made a detailed post about this topic:

https://www.chevelles.com/forums/89-...i-systems.html

Andrew
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I do remote Holley EFI tuning.
I deliver what EFI promises.
Please get in touch if I can be of service.
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post #14 of 15 (permalink) Old Apr 10th, 20, 3:11 PM
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Re: Holly Sniper EFI..how to do it right

Pat, the Holley sniper tank with the internal pump is what I used. I left the distributor alone, as the car ran great before. Turning the key after it sat for the winter and having it fire up and stay running is great. I actually picked up a laptop to fine tune and bought the connector to use it, and have had no reason to mess with it yet. Car is more responsive runs cleaner. And I thought it already ran great with that Quick fuel you have!

1967 Royal Plum, 434BB, AFR Heads, 3.90 gears, New Chris Straub Hyd Roller!, 200r4
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post #15 of 15 (permalink) Old Apr 10th, 20, 4:20 PM Thread Starter
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Re: Holly Sniper EFI..how to do it right

Hey Sam,

That is why I remain intrigued, the Quick Fuel you sold me does work great, car has never run better but then I hear you say how EFI is even better and it keeps me thinking about it

Dakota Digital dash is up first though..

Hope your staying safe up there.
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