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 |
Re: Installing Holley Sniper, have questions Is your speedometer cable drive ? The tach can be hooked to the negative side of the ignition coil. |
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. |
Re: Installing Holley Sniper, have questions
Originally Posted by Tuned Performance
(Post 6306480)
Is your speedometer cable drive ? The tach can be hooked to the negative side of the ignition coil. Hi Tuned, The speedometer is not cable. My problem is where to find the tach wire. Louis |
Re: Installing Holley Sniper, have questions
Originally Posted by scooter
(Post 6306517)
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. Thanks, Louis |
Re: Installing Holley Sniper, have questions https://cimg6.ibsrv.net/gimg/www.thi...3e058b635.jpeg 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. |
Re: Installing Holley Sniper, have questions Hi Tuned, thanks for the info. much appreciated. Louis |
Re: Installing Holley Sniper, have questions
Originally Posted by Tuned Performance
(Post 6306565)
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. 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 https://cimg5.ibsrv.net/gimg/www.thi...79a3dd5790.jpg |
Re: Installing Holley Sniper, have questions Your correct on the white wire. |
Re: Installing Holley Sniper, have questions
Originally Posted by Tuned Performance
(Post 6306581)
Your correct on the white wire. "coil". Do I piggy back both wires? And thanks for your help, really appreciate it. Louis |
Re: Installing Holley Sniper, have questions Do you have a schematic showing the yellow wire or does it say coil negative? |
Re: Installing Holley Sniper, have questions
Originally Posted by Ct1987
(Post 6306640)
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 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. |
Re: Installing Holley Sniper, have questions
Originally Posted by scooter
(Post 6306692)
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. Thanks, Louis |
Re: Installing Holley Sniper, have questions I know this is a old thread . Just curious what distributor did you end up using ? |
Re: Installing Holley Sniper, have questions
Originally Posted by Tuned Performance
(Post 6352747)
I know this is a old thread . Just curious what distributor did you end up using ? Louis |
Re: Installing Holley Sniper, have questions Over all do you like the sniper, I’m debating on this system or just tbi. It’s for a old 76 Chevy truck. |
Re: Installing Holley Sniper, have questions
Originally Posted by Tuned Performance
(Post 6352839)
Over all do you like the sniper, I’m debating on this system or just tbi. It’s for a old 76 Chevy truck. 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 |
Re: Installing Holley Sniper, have questions Thanks for the feedback, I can’t leave well enough alone. I would tinker with it lol. |
Re: Installing Holley Sniper, have questions
Originally Posted by Tuned Performance
(Post 6352842)
Thanks for the feedback, I can’t leave well enough alone. I would tinker with it lol. http://www.EFISystemPro.Com |
Re: Installing Holley Sniper, have questions Thank you very much |
Re: Installing Holley Sniper, have questions
Originally Posted by Tuned Performance
(Post 6352849)
Thank you very much Louis |
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