Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: Cab_Burge]
#3151953
06/16/23 07:51 AM
06/16/23 07:51 AM
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Joined: Jun 2003
Posts: 3,318 Southern Maryland
klunick
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master
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Southern Maryland
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Running it on my non-mopar. 69 Cyclone with 351W. It runs great. I will admit I didn't do the set up on it and unlike the instructions, it took several weeks for the guy to get it running right. I went with the complete holley setup including distro to avoid issues. Not sure if it created or caused delays but before I did this, tried running 2 carbs on the thing and it ran like crap with a dead zone from 2500-3200rpm.
67 Barracuda FB
69 Superbee
"Southern Maryland: If you want a good looking woman, you had better bring her with you"
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: klunick]
#3151975
06/16/23 08:57 AM
06/16/23 08:57 AM
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Joined: May 2019
Posts: 6,240 nowhere
Sniper
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Running it on my non-mopar. 69 Cyclone with 351W. It runs great. I will admit I didn't do the set up on it and unlike the instructions, it took several weeks for the guy to get it running right. I went with the complete holley setup including distro to avoid issues. Not sure if it created or caused delays but before I did this, tried running 2 carbs on the thing and it ran like crap with a dead zone from 2500-3200rpm. But what kind of intake?
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: Sniper]
#3152003
06/16/23 11:04 AM
06/16/23 11:04 AM
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Joined: Jul 2003
Posts: 4,769 Holland MI Ottawa
2boltmain
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Holland MI Ottawa
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I believe an open plenum single plane is what those Throttle body injection systems work better with.
Keep old mopars alive.
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: Cab_Burge]
#3152057
06/16/23 02:02 PM
06/16/23 02:02 PM
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Joined: Jan 2003
Posts: 2,730 541 slobovia
A990
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I believe an open plenum single plane is what those Throttle body injection systems work better with. That is what all the tuners I've talk to say and advise Shower thought: Make an adapter, run 2 2bbl Snipers with 2 controllers so each only handles 4 cylinders.
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: Dabee]
#3152206
06/17/23 02:38 AM
06/17/23 02:38 AM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
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I Win
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Bend,OR USA
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My thoughts on the dual plane versus the single plane intake is EFI ECU fuel management based off of one O2 sensor reading from one side of the exhaust system making the injectors pulse the same on both side of the throttle body when the high part of the intake needs a different amount of fuel than the lower part does at the same throttle position That shouldn't be a problem with a single plane intake
Last edited by Cab_Burge; 06/17/23 02:38 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: Cab_Burge]
#3152236
06/17/23 09:06 AM
06/17/23 09:06 AM
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Joined: May 2019
Posts: 6,240 nowhere
Sniper
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master
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My thoughts on the dual plane versus the single plane intake is EFI ECU fuel management based off of one O2 sensor reading from one side of the exhaust system making the injectors pulse the same on both side of the throttle body when the high part of the intake needs a different amount of fuel than the lower part does at the same throttle position That shouldn't be a problem with a single plane intake If that were so you'd think the carbed versions would be stagger jetted. What I think is that the carb fuel delivery setup is directly tied to airflow thru the carb and, to an extent, it self adjusts side to side that way, at least enough to not be as serious an issue. Whereas EFI sniffs the consolidated output and cannot compensate for distribution issues, seen that on the dyno. 8 O2 sensors show serious AFR differences cylinder to cylinder, TBI or PFI. That's why those claiming "it works" need to tell what intake they are running and if you're using a spacer. that mitigates the issue. The Weiand Stealth has been mooted as a working intake, internally the divider has a notch which mitigated it too.
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: skdmark]
#3152378
06/17/23 07:52 PM
06/17/23 07:52 PM
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Joined: May 2019
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I'm running a sniper on a ld4b intake with a 1 inch phenolic spacer. It's worked really well. The phenolic spacer also acts as an insulator. Why would you need an insulator? It's a return system.
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: 70VcodeCoronetRT]
#3152386
06/17/23 08:28 PM
06/17/23 08:28 PM
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Joined: Jan 2003
Posts: 31,023 Oregon
AndyF
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Hello, was looking at trying an Holley Sniper EFI on my 470 street combo. But Ive read mixed opinions on running one on a dual plane intake. Is anyone running this combo with success? I wanted to hear from someone who has actually tried this setup. thanks Yes, I ran a Sniper on a Performer RPM on my low deck 512 for a few years. It works fine. There are no issues with a Sniper on a dual plane intake. You can do all of the usual tricks for performance such as cutting down the divider or using a one inch spacer.
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: Sniper]
#3152593
06/19/23 12:09 AM
06/19/23 12:09 AM
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Joined: Sep 2009
Posts: 117 SE-WI
skdmark
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I'm running a sniper on a ld4b intake with a 1 inch phenolic spacer. It's worked really well. The phenolic spacer also acts as an insulator. Why would you need an insulator? It's a return system. Insulate the ECU in the sniper from heat transfer.
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: skdmark]
#3152594
06/19/23 12:12 AM
06/19/23 12:12 AM
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Joined: Jan 2003
Posts: 31,023 Oregon
AndyF
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I'm running a sniper on a ld4b intake with a 1 inch phenolic spacer. It's worked really well. The phenolic spacer also acts as an insulator. Why would you need an insulator? It's a return system. Insulate the ECU in the sniper from heat transfer. It isn't needed for fuel control since the fuel is at 60 psi inside the Sniper. Gas doesn't boil at 60 psi so vapor locking is not an issue. There might be a small performance gain by having the throttle body cooler but most likely isn't isn't noticeable. Keeping the ECU cooler might be a good idea in the long run since heat will shorten the life of the electrical components.
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Re: Anyone running a Holley Sniper EFI on an Edelbrock RPM?
[Re: Sniper]
#3152733
06/19/23 03:11 PM
06/19/23 03:11 PM
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Joined: Mar 2005
Posts: 1,545 Seattle, WA
375inStroke
Special needs person
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Seattle, WA
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My thoughts on the dual plane versus the single plane intake is EFI ECU fuel management based off of one O2 sensor reading from one side of the exhaust system making the injectors pulse the same on both side of the throttle body when the high part of the intake needs a different amount of fuel than the lower part does at the same throttle position That shouldn't be a problem with a single plane intake If that were so you'd think the carbed versions would be stagger jetted. What I think is that the carb fuel delivery setup is directly tied to airflow thru the carb and, to an extent, it self adjusts side to side that way, at least enough to not be as serious an issue. Whereas EFI sniffs the consolidated output and cannot compensate for distribution issues, seen that on the dyno. 8 O2 sensors show serious AFR differences cylinder to cylinder, TBI or PFI. That's why those claiming "it works" need to tell what intake they are running and if you're using a spacer. that mitigates the issue. The Weiand Stealth has been mooted as a working intake, internally the divider has a notch which mitigated it too. I'm trying to understand this. Single plane has the most even air and fuel distribution, right? Dual plane can do ok with a carb because less air brings in less fuel with it is what I'm hearing. This would make me believe the TBI would work fine with a dual plane, too. Now with PFI, if a cylinder gets less air than another, since the injectors are near the intake valves, and they all fire with the same duty cycle, they would all get the same amount of fuel, causing uneven air/fuel ratios. What am I missing?
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