Brainstorming for Sniper EFI (Have Questions)
#2854404
12/02/20 03:23 PM
12/02/20 03:23 PM
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Joined: Aug 2007
Posts: 1,819 Middle of A Field
OrangeProwler
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 1,819
Middle of A Field
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Hello. I've been considering putting more focus to my 79 Dodge truck and have been considering converting in the future to a Holley Sniper EFI system for but, need to see what I need to do before I fully commit. Here's the current setup in my 79 Dodge truck: 408 Magnum stroker with 10:5:1 compression, Edelbrock Air Gap Performer RPM Intake, Edelbrock Aluminum heads ported with 2.08 valves, Hughes hydraulic roller cam 228/236 @.050 and .550/.565 on a 108 LSA with 4 degrees of advance built in, 1.7 rockers, MSD Ignition including their distributor, and B/E-Body small block TTI headers with 3 inch exhaust.
Here's my first question, I'm just wondering with the camshaft specification listed above if the system would be able to self learn or would it need a custom tune? I know my power brakes work fine with this setup and believe I pull 14-15 inches of vacuum with this setup. The other question I have is regarding the fuel system. I currently have a bed mounted 20 gallon? fuel cell running an external Holley red pump with regulator. Just wondering if I should go with a Holley/Aeromotive/Other branded external pump or should I try to cut my fuel cell for an in-tank pump? If so which brand of pump?
The last question I have is regarding my electrical system and electrical interference. I'm still running my factory wiring with a couple of modifications with namely the ammeter converted to a voltmeter by Redline Gauges and a Diplomat alternator. On my to do list is a headlight harness as well. I'm just wondering if I would be okay installing the EFI with my factory harness with the addition of fuel injection since I have an MSD Ignition? Sorry for the long post but, just brainstorming and looking for some guidance here. Thank you in advance.
Last edited by RustyMopar01; 12/02/20 03:25 PM.
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Re: Brainstorming for Sniper EFI (Have Questions)
[Re: AndyF]
#2854953
12/03/20 09:02 PM
12/03/20 09:02 PM
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Joined: Aug 2007
Posts: 1,819 Middle of A Field
OrangeProwler
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 1,819
Middle of A Field
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You need an EFI fuel pump since the fuel pressure has to be 60 psi to the throttle body. So the pump, filters, line, regulator, etc. all have to be EFI rated parts. Carb stuff won't work at 60 psi. Thank you. Here's one of the pumps I'm considering. https://www.summitracing.com/parts/hly-12-144Here's something I thought of and that's regarding the ECTS (Engine Coolant Temperature Sensor) is I'm wondering if I should drill out the thermostat housing to install the sensor or if I should use an NPT adapter to install where the 1/4 temperature sending unit is located? I've attached a picture with an arrow pointing where the part of the thermostat housing is unused but, uncertain if it would be a good spot or not for the sensor?
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Re: Brainstorming for Sniper EFI (Have Questions)
[Re: OrangeProwler]
#2855676
12/05/20 12:52 PM
12/05/20 12:52 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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As mentioned, the fuel side is the hard part of converting to EFI. If you can run an in-tank EFI fuel pump. it saves you from needing a pump pre-filter, the pump will run cooler and quieter too. Post fuel pump, you need a 10 to 30 micron (max) fuel filter, AND a clean supply fuel line to the EFI. Any garbage into the EFI fuel inlet is going to cause injector and regulator issues. I run a return type system too. It keeps the fuel flowing and cool. Pre-run fuel through the pump and lines to clear any debris before connecting to the EFI fuel rail.
The sniper I installed on Mikes car works good. He used the entire sniper setup, tank, pump, distributor, CD bod and coil. I have seen some complain about emi issues, but I don't know if that is wiring related, or related to using a magnetic pickup distributor vs. the HyperSpark distributor?
I have the older FiTech, and have no issues with emi, running a lean-burn distributor.
These new EFI are pretty well setup out of the box. You do need a good exhaust seal for the O2 sensor. Header leaks and such will throe the O2 sensors readings off. Your engine combination should not be a problem at all for the EFI.
I'm running the FiTech on my 500" stroker with a 270+ duration @ 0.050", 0.726" lift cam. It did take a bit of extra adjustments to the tune, but pretty easy.
One thing usually not mentioned is you don't plop the EFI on and then go to town. Need to take it easy at first so the EFI can self learn. First the EFI does not enter self learn until the engine is warmed up, I think 170+ degrees. Then it would like to self learn over the rpm range with various loads to trim the fuel map. The Ignition tuning is all manual, no self learn there. Stock map is good. The important thing is to install the distributor with the correct phasing and verify the engines actual ignition timing is what the EFI is displaying.
When going from a carb to EFI, you read fuel pressure differently. Normally with a carb, you want to see a steady fuel pressure. With EFI the regulator will change the fuel pressure up or down depending on the manifold pressure. The idea is to keep the same pressure differential across the injector.
Last edited by 451Mopar; 12/05/20 12:53 PM.
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