Installing Holley Sniper, have questions
#1
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Installing Holley Sniper, have questions
Hi,
I am in the process of installing the Holley Sniper EFI system in my 87 Firebird 305 engine, which was carb.
I believe there are some on this site that have done this. My questions are: Will I loose speedometer?, I believe I will loose tach,
Is there any other losses that I should be aware of? How do I resolve these issues.
Thanks,
Louis
I am in the process of installing the Holley Sniper EFI system in my 87 Firebird 305 engine, which was carb.
I believe there are some on this site that have done this. My questions are: Will I loose speedometer?, I believe I will loose tach,
Is there any other losses that I should be aware of? How do I resolve these issues.
Thanks,
Louis
#3
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Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: Installing Holley Sniper, have questions
The tach is part of the engine harness, but connected to the coil, so you just need to retain that from the engine harness. I'd have to look in my factory manual, but the VSS comes from the trans and should either go directly to the dash, or a buffer box? That should be easy to retain also. You can also use the coil wire as the ignition source for the Holley harness, that is how I wired in my Holley EFI in my other vehicles.
I would start by reading the LS swap guide for the body side stuff, it will apply to any engine swap that isn't factory.
I would start by reading the LS swap guide for the body side stuff, it will apply to any engine swap that isn't factory.
#4
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82talightblue (05-04-2020)
#5
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Re: Installing Holley Sniper, have questions
The tach is part of the engine harness, but connected to the coil, so you just need to retain that from the engine harness. I'd have to look in my factory manual, but the VSS comes from the trans and should either go directly to the dash, or a buffer box? That should be easy to retain also. You can also use the coil wire as the ignition source for the Holley harness, that is how I wired in my Holley EFI in my other vehicles.
I would start by reading the LS swap guide for the body side stuff, it will apply to any engine swap that isn't factory.
I would start by reading the LS swap guide for the body side stuff, it will apply to any engine swap that isn't factory.
Thanks,
Louis
#6
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Re: Installing Holley Sniper, have questions
The tach wires run through c100 it’s a white wire going to the coil. If you don’t have a cable drive Vss retain the wiring from the Vss to the Vss buffer. It’s all connected through the passengers side body pass through connector.
Last edited by Tuned Performance; 06-05-2019 at 07:11 PM.
#7
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Re: Installing Holley Sniper, have questions
Hi Tuned, thanks for the info. much appreciated.
Louis
Louis
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#8
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Re: Installing Holley Sniper, have questions
The heavy red wire in the gray connector is the 12 volt I am using for the Sniper efi. Can you clear this up for me.
Thanks,
louis
#10
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Re: Installing Holley Sniper, have questions
Great, one last question, I assume this wire will attach to the "tach" terminal of the HEI distributor that I am using. The install of the sniper has one wire already attached to the "tach" terminal, one yellow one labeled
"coil". Do I piggy back both wires?
And thanks for your help, really appreciate it.
Louis
"coil". Do I piggy back both wires?
And thanks for your help, really appreciate it.
Louis
#12
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Join Date: Sep 1999
Location: NJ
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Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: Installing Holley Sniper, have questions
Great, one last question, I assume this wire will attach to the "tach" terminal of the HEI distributor that I am using. The install of the sniper has one wire already attached to the "tach" terminal, one yellow one labeled
"coil". Do I piggy back both wires?
And thanks for your help, really appreciate it.
Louis
"coil". Do I piggy back both wires?
And thanks for your help, really appreciate it.
Louis
AGAIN reference what YOU GOT with your kit, but this shows page 6 that the yellow wire is for the tach input to the Holley system
https://documents.holley.com/199r11193.pdf
If this is what you actually have, then you could either use the coil negative for your tach, OR the brown wire from the Holley to drive your tach.
Last edited by scooter; 06-06-2019 at 01:01 PM.
#13
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Re: Installing Holley Sniper, have questions
You should really be referencing the instructions or the wire schematic from the Holley setup instead of asking us.
AGAIN reference what YOU GOT with your kit, but this shows page 6 that the yellow wire is for the tach input to the Holley system
https://documents.holley.com/199r11193.pdf
If this is what you actually have, then you could either use the coil negative for your tach, OR the brown wire from the Holley to drive your tach.
AGAIN reference what YOU GOT with your kit, but this shows page 6 that the yellow wire is for the tach input to the Holley system
https://documents.holley.com/199r11193.pdf
If this is what you actually have, then you could either use the coil negative for your tach, OR the brown wire from the Holley to drive your tach.
Thanks,
Louis
#15
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Re: Installing Holley Sniper, have questions
Louis
#17
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Re: Installing Holley Sniper, have questions
All in all, I am very happy with the unit. I see more power, a little better gas mileage and fast starts. You can just install it with the recommended settings and forget about it or if you are inclined, go crazy with tunning via laptop.
Louis
#19
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Re: Installing Holley Sniper, have questions
http://www.EFISystemPro.Com
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