I got one on eBay that was aluminum and didn’t last a year…..took it to a Waterjet guy and had a 304 stainless block of steel cut out. Took to my friends shop and had the hole drilled and tapped for the 02. I used a 90 degree bung and that has worked well to keep sensors from getting moisture on it from exhaust.
Very cool video ! I have a 496 fuel injected motor in my boat and was considering a carb conversion to make things simple and reliable... (and faster) but now may put one of these sniper units on a Dart carb'd intake instead. Looks very reliable and easier to tweak/tune.
Love the video a lot of useful information I just talked to my boat mechanic he was saying that EFI was a waste of time to notice any improvements in performance or horsepower how about having trouble with O2 sensors
I know this was a year ago, but the engine cutting ignition to shift, is something you can program into your Holley, and get it to cut fuel at the same time..
I would like to know more about your suggestion! I asked Holley on the phone about it but I don’t think I described it properly because they didn’t have any reply.
Please explain further about the shift interrupt switch. I was considering the Edelbrock carb and now looking at the sniper EFI. my concern is when the shift interrupt switch grounds the EFI. Thank You.
The sniper unit is not connected to the shift ignition interrupt switch. I had originally wired the sniper tach wire to the coil which is wrong. 2nd video talked about it. I have yet to get boat back in the water to see if any difference wired properly. Holley describes that sniper is sensitive to electrical noise. 3rd video will be completed when I get boat in the water to test.
Thanks for letting me know. I watched some videos that suggested because the tach does a surge when the ignition is first turned on, that the computer thinks that the engine needs that much fuel and it instructs the injectors to give that much fuel, causing flooding on warm starts. I'm glad to know that this product is not causing that for you! Can you send me a link to where you purchased this, please, and a link to the other 2 videos. Thanks
@@AK-ki5kz I purchased from jeggs. It was the kit version that came with the pump, hose and fittings. You may want to price out getting the pump and hose separately if for marine application.
hi, Im trying to order this kit for my me cruiser 350 vintage 1985 cant seem to get these guys on the phone , I dont see a kit with the plate under the riser like you did, is there a kit with that, or is it separate ?
When you say the sniper does not like the mercruiser interrupt shifting switch what specifically does the sniper not like? also, did your sniper kit come with the new distributor and how did you go about installing it and who did you purchase through and how were the instructions and or phone support as well as cost. Thanks by the way the video helped me thanks for making it.
When the ignition cuts out there is a cough/ sputter during shifting out of gear. Not the end of the world. Bought it through Jeggs. No support with jeggs. Holley has been helpful over the phone. I use the stock distributor with pertronix ignitor. My sniper was working great for about 50hrs and then started flooding. Sent unit back and they said 2 months to even get to it. Sometime in February is what they said and it went bad early December. Hope it is a fluke problem….. time will tell. When it works it is awesome but when it goes bad there is no limping it home in my experience.
Not sure why people feel the need to do this. My old Rochester Quadrajet on my Merc 5.7 runs and works like a champ. Great fuel efficiency and horsepower. Easy to maintain.
Runs great. No complaints on sniper. Had a couple shift issues but that was more related to a weak ignition. I used pertronix ignitor as electronic ignition and found resistor wire left over from point ignition. Now has 12V to coil and is a game changer. Let me know what you learn and experience! Ask any ?’s you have!!!!
Looking to do this to my MerCruiser did the holy EFI come with a fuel pump or did you do something yourself did you change the distributor or keep the original and can we get a link for the O2 sensor block of eBay that you installed also thank you for your video
I bought the kit marine kit from Holley. It comes with marine rated pump. I used stock distributor with pertronix pickup and coil. Be sure to remove resistor wire. I have videos on that too. I left link in another reply. eBay marine gm 350 02 sensor plate.
Hi I am looking for a spacer plate for a 454 big block I am changing it over to an EFI this winter time could you tell me what you look for on eBay for that thanks
This will get you started. I didn’t see an option for 454. I have seen from google search in the past. Watch then second video on the fuel pump switch for coast guards compliance.
I have a couple videos about sniper install. I don’t think specific about the ignitor. It is a basic coil negative wiring. Totally stock. Nothing unique.
@@bigbossjrmang Thats what my intentions were, just hook up basic, but the Holley Technician said my existing Thunderbolt 5 module, which controls ignition spark would cause problems with my Holley sniper EFI.
Yes horizon 190. When it works it’s awesome. I have had a bad o2 and it still worked ok when unplugged. New o2 then a couple hours later it ran horrible dumping fuel. Unplugged o2 and no change. Holley sent warranty shipping label for the main unit. They tested and said nothing wrong. I reinstalled and it works great……when it works it is excellent!
Yes horizon 190. When it works it’s awesome. I have had a bad o2 and it still worked ok when unplugged. New o2 then a couple hours later it ran horrible dumping fuel. Unplugged o2 and no change. Holley sent warranty shipping label for the main unit. They tested and said nothing wrong. I reinstalled and it works great……when it works it is excellent!
@@bigbossjrmang you have to take of the reluctor wheel off the back of the crank. Can't be on with a new efi setup. That's why it runs well and then doesn't. The sensor in it is on and reading tdc then going out of whack.
What distributer set up did you use? Also where do i hook up the two wires coming from the Shift interrupter cutoff switch? Please let me know I have no fucking idea Thanks
@@bigbossjrmang I am adding hyperspark coil and cd box. I have two yellow wires coming from shift interrupt and grey and purple wire coming from wire bundle. Please inform me anything you may know i am stuck on the 4 yard down I need this TD please Thank you for your time
I don’t know about that system. My setup has 1 of the wires from shift interrupt go to ground and the other to the negative side of the coil. forums.iboats.com/threads/shift-interrupt-switch-for-holley-hp-efi-conversion.674975/ This link describes someone that had it work that way.
Your fuel system install is dangerous. It needs to be wired so the pump will not turn on unless it senses oil pressure. Single hose clamps and rubber hose is risky as well. I highly recommend a intank returnless pump with braided fuel hose and -AN fittings wired the way I mentioned. 😎
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
I got one on eBay that was aluminum and didn’t last a year…..took it to a Waterjet guy and had a 304 stainless block of steel cut out. Took to my friends shop and had the hole drilled and tapped for the 02. I used a 90 degree bung and that has worked well to keep sensors from getting moisture on it from exhaust.
Very cool video ! I have a 496 fuel injected motor in my boat and was considering a carb conversion to make things simple and reliable... (and faster) but now may put one of these sniper units on a Dart carb'd intake instead. Looks very reliable and easier to tweak/tune.
Where did you purchase or have fabricated the spacer between the manifold and riser for the O2 sensor?
Excellent video! Lots of time saving suggestions and very well done. Thank you for posting!
Love the video a lot of useful information I just talked to my boat mechanic he was saying that EFI was a waste of time to notice any improvements in performance or horsepower how about having trouble with O2 sensors
❤❤❤❤❤ great video
I know this was a year ago, but the engine cutting ignition to shift, is something you can program into your Holley, and get it to cut fuel at the same time..
I would like to know more about your suggestion! I asked Holley on the phone about it but I don’t think I described it properly because they didn’t have any reply.
I watched your EFI holley install . I need to see how you wired the holley sniper. I'm about to install on my 5.7 V8 350 need help with wiring.
Was the spacer plate for the O2 sensor off the shelf, or custom made?
From ebay
Please explain further about the shift interrupt switch. I was considering the Edelbrock carb and now looking at the sniper EFI. my concern is when the shift interrupt switch grounds the EFI. Thank You.
The sniper unit is not connected to the shift ignition interrupt switch. I had originally wired the sniper tach wire to the coil which is wrong. 2nd video talked about it. I have yet to get boat back in the water to see if any difference wired properly. Holley describes that sniper is sensitive to electrical noise. 3rd video will be completed when I get boat in the water to test.
Have you had any issues with flooding when doing warm or hot starts? Thanks
Not so far.
Thanks for letting me know.
I watched some videos that suggested because the tach does a surge when the ignition is first turned on, that the computer thinks that the engine needs that much fuel and it instructs the injectors to give that much fuel, causing flooding on warm starts.
I'm glad to know that this product is not causing that for you!
Can you send me a link to where you purchased this, please, and a link to the other 2 videos. Thanks
@@AK-ki5kz ua-cam.com/video/KvIDFE5mg9Q/v-deo.html
@@AK-ki5kz I purchased from jeggs. It was the kit version that came with the pump, hose and fittings. You may want to price out getting the pump and hose separately if for marine application.
Thanks for the video, How much did you paid for the EFI.... I am looking to making the change on my boat as well... thanks..
Around $1800. Kit cost plus the oil switch and coast guard marine hose and extension cable.
hi, Im trying to order this kit for my me cruiser 350 vintage 1985 cant seem to get these guys on the phone , I dont see a kit with the plate under the riser like you did, is there a kit with that, or is it separate ?
Separate. Got it on eBay.
When you say the sniper does not like the mercruiser interrupt shifting switch what specifically does the sniper not like? also, did your sniper kit come with the new distributor and how did you go about installing it and who did you purchase through and how were the instructions and or phone support as well as cost. Thanks by the way the video helped me thanks for making it.
When the ignition cuts out there is a cough/ sputter during shifting out of gear. Not the end of the world. Bought it through Jeggs. No support with jeggs. Holley has been helpful over the phone. I use the stock distributor with pertronix ignitor. My sniper was working great for about 50hrs and then started flooding. Sent unit back and they said 2 months to even get to it. Sometime in February is what they said and it went bad early December. Hope it is a fluke problem….. time will tell. When it works it is awesome but when it goes bad there is no limping it home in my experience.
Not sure why people feel the need to do this. My old Rochester Quadrajet on my Merc 5.7 runs and works like a champ. Great fuel efficiency and horsepower. Easy to maintain.
Any updates on the sniper system? I just ordered my sniper kit for my mercruiser 5.7. Hows she run??
Runs great. No complaints on sniper. Had a couple shift issues but that was more related to a weak ignition. I used pertronix ignitor as electronic ignition and found resistor wire left over from point ignition. Now has 12V to coil and is a game changer. Let me know what you learn and experience! Ask any ?’s you have!!!!
Did you purchase components separate or was it a kit? Trying to swap my chevy 350 with an edelbrock
Kit
@@bigbossjrmang mind sharing the spacer plate link? Thanks for the hel
OXYGEN SENSOR PLATE MERCRUISER OUT DRIVE V-6 V-8 CHEVY SBC BBC FORD W/GASKETS
Search that in ebay
Looking to do this to my MerCruiser did the holy EFI come with a fuel pump or did you do something yourself did you change the distributor or keep the original and can we get a link for the O2 sensor block of eBay that you installed also thank you for your video
I bought the kit marine kit from Holley. It comes with marine rated pump. I used stock distributor with pertronix pickup and coil. Be sure to remove resistor wire. I have videos on that too. I left link in another reply. eBay marine gm 350 02 sensor plate.
What about running an hei distributor out of a TBI 350 Chevy it's in the coil cap and all is in one
Hi I am looking for a spacer plate for a 454 big block I am changing it over to an EFI this winter time could you tell me what you look for on eBay for that thanks
www.ebay.com/itm/322489451597?hash=item4b15de844d:g:NIkAAOSwWiBY-RWT
This will get you started. I didn’t see an option for 454. I have seen from google search in the past. Watch then second video on the fuel pump switch for coast guards compliance.
Wouldnt the o2 get water on it ?
Do you have a thunderbolt-5 ignition system already on your boat?
No. Pertronix ignitor and coil. Basic distributor.
@@bigbossjrmang the reason I was asking because I didn't see your pertronix ignitor in your video. Do you have pic of that install
I have a couple videos about sniper install. I don’t think specific about the ignitor. It is a basic coil negative wiring. Totally stock. Nothing unique.
@@bigbossjrmang Thats what my intentions were, just hook up basic, but the Holley Technician said my existing Thunderbolt 5 module, which controls ignition spark would cause problems with my Holley sniper EFI.
I don’t have thunder bolt. I don’t know anything about it.
190 horizon? Any update on the new system.... Going well?
Yes horizon 190. When it works it’s awesome. I have had a bad o2 and it still worked ok when unplugged. New o2 then a couple hours later it ran horrible dumping fuel. Unplugged o2 and no change. Holley sent warranty shipping label for the main unit. They tested and said nothing wrong. I reinstalled and it works great……when it works it is excellent!
Yes horizon 190. When it works it’s awesome. I have had a bad o2 and it still worked ok when unplugged. New o2 then a couple hours later it ran horrible dumping fuel. Unplugged o2 and no change. Holley sent warranty shipping label for the main unit. They tested and said nothing wrong. I reinstalled and it works great……when it works it is excellent!
Hey hit me up, I figured out your efi issue on your boat. Hope you reply!
Share your secrets!!!
Share your secrets!!!
Share your secrets!!!
@@bigbossjrmang you have to take of the reluctor wheel off the back of the crank. Can't be on with a new efi setup. That's why it runs well and then doesn't. The sensor in it is on and reading tdc then going out of whack.
@@bigbossjrmang just take of the timing chain cover and rip it off. Problem should be solved.
How is it running? Did you have to adjust violent temp settings for it to go on open loop?
160 thermostat. No issues worked properly right out of the box. New video to abide by coat guard requirements soon.
Anyway you could post where you put your 02?
The video shows the 02 sensor install. Where and how.
💪💪💪👍👍👍👍
What distributer set up did you use? Also where do i hook up the two wires coming from the Shift interrupter cutoff switch? Please let me know I have no fucking idea Thanks
Stock distributor with pertronix ignitor and flamethrower coil. Shift interrupt is wired to - side of the coil to momentarily disrupt ignition.
@@bigbossjrmang I am adding hyperspark coil and cd box. I have two yellow wires coming from shift interrupt and grey and purple wire coming from wire bundle. Please inform me anything you may know i am stuck on the 4 yard down I need this TD please Thank you for your time
I don’t know about that system. My setup has 1 of the wires from shift interrupt go to ground and the other to the negative side of the coil. forums.iboats.com/threads/shift-interrupt-switch-for-holley-hp-efi-conversion.674975/
This link describes someone that had it work that way.
is it possible to NOT use an O2 sensor? and do open loop?
I think it is. A call to Holley would be best to confirm.
Have you noticed any better fuel efficiency?
Only 1 test run, hopefully a catalina run soon to give a good answer!!!!
Only 1 test run, hopefully a catalina run soon to give a good answer!!!!
Only 1 test run, hopefully a catalina run soon to give a good answer!!!!
Only 1 test run, hopefully a catalina run soon to give a good answer!!!!
Only 1 test run, hopefully a catalina run soon to give a good answer!!!!
Non ethanol fuel would of fixed the vapor lock
Ilike
Hot me up
Your fuel system install is dangerous. It needs to be wired so the pump will not turn on unless it senses oil pressure. Single hose clamps and rubber hose is risky as well. I highly recommend a intank returnless pump with braided fuel hose and -AN fittings wired the way I mentioned. 😎
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
Thank you for sayN hi!!!! The switch your describing has already been installed and wired as per USCG requirements. I am making a follow up video. The kit came with vapor guard hose Which is coast guard approved. The clamps installed are rated for fuel injection and are stainless steel. There was not enough room on the fitting to dual clamp unless it was on the barb. I did not see a USCG requirement for dual clamps. If you have a link please share. I also have a momentary button installed to be able to prime the system before cranking which is USCG approved. Any further info please share thank you. Go USA!!!!!!
👍👍👍👍👌👌👌