EFI Conversion? - Chevelle Tech
EFI Caution: Beyond here be monsters...

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post #1 of 78 (permalink) Old Jun 17th, 17, 7:07 AM Thread Starter
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Dustin
 
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EFI Conversion?

I'm extremly close to biting the bullet and doing the Sniper EFI conversion on my 72 Chevelle. I'm tired of fighting with the edelbrock carb and it's to the point of "do I want to throw more money at this to maybe get results?"

It this conversion really as simple as:
1) Buy Sniper EFI Kit
2) Buy new tank
3) Buy new pump
4) Buy new sending unit
5) I've read some threads that say to buy a temp sensor

This just seems too simple.

What does everyone recommend for the fuel line setup? Use stock lines or go buy new lines and run them?

I also have an MSD Distributor and I've read on a couple threads the timing control modification on this might cause issues.

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post #2 of 78 (permalink) Old Jun 17th, 17, 8:19 AM Thread Starter
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Re: EFI Conversion?

I was looking at this tank: 1971-72 Chevrolet Chevelle Gas Tank - For Fuel Injection
This pump: In-Tank Fuel Pump Module - GPA-Series
This Sender: 5 Bolt Fuel Sending Unit
This line kit: Universal Fuel Line Kit

From what I read the Sniper EFI has a built in fuel pressure regulator so I won't need an adjustable one.

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1972 Chevelle - 396, 4 Speed
1992 Acura Integra
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post #3 of 78 (permalink) Old Jun 17th, 17, 9:15 AM
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Pat
 
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Re: EFI Conversion?

It is pretty much that simple. You can either get a tank set up for FI, like the one you linked or buy the sniper complete kit that comes with pump, filters, and hoses. Run a return line to the tank, a few wire connections and turn the key.

Depending on how in depth you want to go to have things controlled by the sniper it can be simple or frustrating as posted here many times. I only have it set up for basic system as of now, but still finishing up things on the car so not much driving yet. Seats are at upolustery shop, but still start to keep it fresh. Does seem to run rich right now, but I am sure that is due to lack of time to let it learn.

My personal set up is the tanks inc tank with aeromotive stealth fuel system. I ran Earls ptfe lines. MSD large HEI cap, but I haven't gotten to the point of letting sniper control timing yet.
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post #4 of 78 (permalink) Old Jun 17th, 17, 10:35 AM
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Re: EFI Conversion?

The self learning systems really are simple. Having been through a couple of fuel systems, I would advise going with a good set up from the start. I used a gravity feed external pump that came with my system but it just seemed like a cheap get the job done system rather than a well though out set up. I ended up buying a new Spectra tank and adding an Aeromotive Phantom 340 in-tank pump and all new hard/braided lines for fuel delivery and return. My system is a TB system and I have found that fuel distribution is quite different to each port so I am in the process of converting to a multi-port system which should help immensely.

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post #5 of 78 (permalink) Old Jun 17th, 17, 11:20 AM
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Re: EFI Conversion?

I did mine almost 20 years ago the edlebrock pro flow first generation. Still works like new. If I was to do it again I'd look for a used first or second gen I've seen them cheap in the past. You don't need the intake you can drill holes for the injectors and rails so a small block kit can work on a big block up to 450hp with original injectors. It's not as simple as just bolting on these new ones that look like carbs but you would save a lot if you can find a good deal.
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post #6 of 78 (permalink) Old Jun 17th, 17, 12:25 PM Thread Starter
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Re: EFI Conversion?

Any feedback or recommendations on tanks and pumps? I want an intank pump personally.

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1992 Acura Integra
2002 Yamaha R1
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post #7 of 78 (permalink) Old Jun 17th, 17, 12:39 PM
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Re: EFI Conversion?

Might be helpful to read the installation instructions. I know it's "like cheating" but there is a ton of information in there...

http://documents.holley.com/199r11031r.pdf

Holley also has a few, very helpful, videos on their youtube channel!

Andrew
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post #8 of 78 (permalink) Old Jun 17th, 17, 12:48 PM Thread Starter
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Re: EFI Conversion?

I watched the install video and one question I have is they say the power and ground need to hook directly to the batter but mine is located in the trunk so that means I'll have to run the wires all the way back there unless someone has had success with other methods

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post #9 of 78 (permalink) Old Jun 17th, 17, 12:53 PM
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Andrew
 
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Re: EFI Conversion?

Quote:
Originally Posted by Tegguy View Post
I watched the install video and one question I have is they say the power and ground need to hook directly to the batter but mine is located in the trunk so that means I'll have to run the wires all the way back there unless someone has had success with other methods

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Holley is adamant that the power leads go directly to the battery and I would not change that, even if someone "got away with it." On my Dominator ECU the power leads were extremely long and I could have easily routed them to a trunk mounted battery. I don't know how long the power leads are on the Sniper kits.

Andrew

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post #10 of 78 (permalink) Old Jun 17th, 17, 12:57 PM
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Re: EFI Conversion?

Quote:
Originally Posted by Tegguy View Post
I was looking at this tank: 1971-72 Chevrolet Chevelle Gas Tank - For Fuel Injection
This pump: In-Tank Fuel Pump Module - GPA-Series
This Sender: 5 Bolt Fuel Sending Unit
This line kit: Universal Fuel Line Kit

From what I read the Sniper EFI has a built in fuel pressure regulator so I won't need an adjustable one.
Yes the Sniper the FiTech both have built in regulators.

That line kit will probably come up short on hose. 25 feet isn't enough. You also may want to use 90 degree fittings at the throttle body for air filter clearance.
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post #11 of 78 (permalink) Old Jun 17th, 17, 1:06 PM Thread Starter
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Re: EFI Conversion?

Quote:
Originally Posted by T_R View Post
Yes the Sniper the FiTech both have built in regulators.

That line kit will probably come up short on hose. 25 feet isn't enough. You also may want to use 90 degree fittings at the throttle body for air filter clearance.
Do I need new supply and return lines or just return? If I need new both I'll look into more line (or is there a better quality line?) I'll look into some 90 degree fittings also.

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post #12 of 78 (permalink) Old Jun 17th, 17, 1:26 PM
T_R
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Re: EFI Conversion?

Quote:
Originally Posted by Tegguy View Post
Do I need new supply and return lines or just return? If I need new both I'll look into more line (or is there a better quality line?) I'll look into some 90 degree fittings also.

Sent from my SM-G935V using Tapatalk
That hose in the link you posted is fine. I used stainless braided because I thought it might be more reisitant to rubbing through. You could use the existing line as a return if you wanted to, I just went with all new. It was easier to start fresh than mess with connecting to existing stuff.

I got 2 20 foot lengths of -6 braided hose, 4 straight ends, 2 90 ends, an inline -6 fuel filter and 2 npt to -6 adapters for the tank unit. It think it's 1/4 npt there, double check that. I just followed the normal routing for the hoses and used zip ties to secure them to the frame. You'll also need some 5/16 rubber hose for the vent lines at the tank. It was very easy.

Tom

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post #13 of 78 (permalink) Old Jun 17th, 17, 2:33 PM Thread Starter
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Re: EFI Conversion?

I know some carbs only work with certain intakes. Is this the case for these EFI systems also?

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1955 Ford Thunderbird
1969 Triumph TR6
1972 Chevelle - 396, 4 Speed
1992 Acura Integra
2002 Yamaha R1
2004 Dodge Ram 1500
2012 Dodge Durango Citadel
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post #14 of 78 (permalink) Old Jun 17th, 17, 3:13 PM Thread Starter
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Re: EFI Conversion?

I have the MSD 8365 distributor https://www.msdperformance.com/produ...let/parts/8365 what would I need to make this work with the Sniper EFI? Is this recommended or do people have problems?

1955 Ford Thunderbird
1969 Triumph TR6
1972 Chevelle - 396, 4 Speed
1992 Acura Integra
2002 Yamaha R1
2004 Dodge Ram 1500
2012 Dodge Durango Citadel
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post #15 of 78 (permalink) Old Jun 17th, 17, 6:47 PM Thread Starter
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Re: EFI Conversion?

Another question....i have a 396 with a mild cam and headers I know the smaller version is good to around 650Hp how many upgrades would it take to cross this line (dollars perspective) I'm trying to figure out if I'd ever cross the line of needing the bigger one

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