Holley Sniper EFI. Who’s running one, any opinions, tuning?

[Turbo Zach]

Why do you say I didn’t follow directions? I read the booklet many times and did what they said for installation. Im not complaining about it, at least I’m not trying to, I’m just trying to figure this thing out and asking for help. I really appreciate all the feedback and help. I am running a filter regulator that sends 60 psi to the unit. So there is no return line. I was told this would work. It’s a GM filter regulator used on LS powered corvette. I thought about running a return line anyway. Again Thanks to everyone and much appreciated for the wisdom.

The main ground is not hooked up to the battery. You are using an intake that is not recommended. The Sniper has a fuel regulator built into it. You should not need one before it. Holley also has kind of a fuel pump hotwire set up built into the harnesses. The fuel pump gets power from the main feed on the battery. It would be better if it came from the alternator. With the regulator before the Sniper it is possible you are not supplying enough psi to it all the time making it go lean. What are your AFR's when the problem occurs? I believe the instructions say to remove the Holley fuel regulator if an aftermarket one is used. At least with a boosted application you do. I would get a gauge on the fuel line so you know what pressure you are getting. You never did tell me what ignition you are using? HEI? MSD? HOLLEY? Hope some of this will help you.

 

[Turbo Zach]

So I went over everything and all the wiring is correct. Power and ground go directly to the battery. I figured a fresh start would be best. I went through the setup wizard and started over. I checked my timing and initial is 11.5 and all in at 35. I looked at my stock of -an fittings and I had the parts to put a fuel pressure gauge on but it was the wrong size so I ordered one. My IAC was a little off so I set that and took it for a short drive. it is much better! Other than drive, what would be the next step?

Go to hear. I would scale back the self learn back a little now. Drive it and watch what the AFR And timing are doing. Once you like how it runs, scale the self learn all the way back. Then after that I would tweak the timing and fuel a little bit with your settings. Some time I would give this tune a name so if something goes funny you know what tune is what. I think you are heading in right direction now.

 

[1983calais]

Go to hear. I would scale back the self learn back a little now. Drive it and watch what the AFR And timing are doing. Once you like how it runs, scale the self learn all the way back. Then after that I would tweak the timing and fuel a little bit with your settings. Some time I would give this tune a name so if something goes funny you know what tune is what. I think you are heading in right direction now.

Thanks Zach! I checked the learn function and it is set at 50%. You say to scale that back some? The distributor is a Pertronix ready to run with an external coil. Basically an hei with a matching canister coil. I am not controlling it with the Sniper. When I take off or make a turn and let the clutch out the afr goes pretty lean and the car chugs If the rpms are way down. I will check on the internal regulator. I did take it down the road and back, and did about a dozen take offs. Acted much better with only minor chugging. When you say save a tune, you want me to start a datalog?

 

[1983calais]

Just checked and the internal regulator is bypassed by capping the return port, which is how I have it setup. I should have the guage fitting in a couple days and then I can be sure of the pressure.

 

[Turbo Zach]

Thanks Zach! I checked the learn function and it is set at 50%. You say to scale that back some? The distributor is a Pertronix ready to run with an external coil. Basically an hei with a matching canister coil. I am not controlling it with the Sniper. When I take off or make a turn and let the clutch out the afr goes pretty lean and the car chugs If the rpms are way down. I will check on the internal regulator. I did take it down the road and back, and did about a dozen take offs. Acted much better with only minor chugging.

That sounds like it is running out of fuel. I would get a gauge on the fuel. Even if it is temporary so you can see what is going on. Once you like where it runs scale the self learn all the way back. Veritable timing is the secret to why my combo works so good. Holley came out with the new distributor for a small block Chevy that works real good with the Sniper. It is worth looking into. I think you're aftermarket regulator setup is the problem my self. Mine is on the return side so it is more constant. I also removed the factory one. Had too for boost.

 

[1983calais]

I’m using the Wix 33737 filter regulator. Thinking about getting the Holley one pontiacgp suggested. You have a part number for that distributor? That was my plan from the beginning to get it running goo, because I was unfamiliar with this setup, and go for the timing control option. Thanks again Zach for everything!

Found the part numbers. Hyperspark system I assume.

 

[Turbo Zach]

I went and looked at my manual. I printed it out and keep it in a binder for reference. This is how the fuel system should be ran.

Here is where it talks about Self learn.

Once you check the pressure you can mess with the accelerator function. Beings it is a manual shift car you might need to enrich it a little bit.

 

[1983calais]

Got the pressure gauge on and it’s a steady 60 psi. Even when I give it throttle. Guess I will drive it some and see what happens.

 

[pontiacgp]

I went and looked at my manual. I printed it out and keep it in a binder for reference. This is how the fuel system should be ran.View attachment 148667 Here is where it talks about Self learn.View attachment 148668 Once you check the pressure you can mess with the accelerator function. Beings it is a manual shift car you might need to enrich it a little bit.View attachment 148669

when you say "should be run" does that mean you don't have it set up that way?. The regulator in the diagram has a vacuum port on it which adjusts the fuel pressure according to the needs of the engine

 

[Turbo Zach]

when you say "should be run" does that mean you don't have it set up that way?. The regulator in the diagram has a vacuum port on it which adjusts the fuel pressure according to the needs of the engine

Sorry. My spelling and grammar is horrible and I have worked a lot lately. I have been very tired at night. Don't mean to make excuses, sorry I will try harder next time boss. As for the problem. Pressure sounds like it is ok. What type of fuel lines are you running? Could be a flow issue? Also could be a timing issue also. Hope it runs better for you now.