View Full Version : #324 first start today!
Got it fired up for the first time today. Been working on it about 4 months so far.
Everything went fine but a couple minor problems. I have a 347 crate with sniper efi and full hyperspark ignition system. I'm very impressed with how well it ran right off the bat. It had excellent throttle response and idle immediately.
Only had a couple small problems.
1. The temp gauge immediately pegged. I suspect a bad ground?
2. The oil temp read 100 psi which seems pretty high to me. I'm thinking maybe wrong sending unit? Does anybody know which one is best for autometer ultra lite gauges?
3. I thought I had the fan all wired up correctly but it never came on. I shut it down before I had any overheating problems. I'm letting the EFI control the fan and have the light blue hooked up to the ground on the fan. Back at the harness, I have the orange fan wired u to the brown feed wire so it's constant hot. This is in lieu of having a toggle on the dash. Figure I'll test the power to it since the holley controls the negative ground wire.
https://youtu.be/r_wDShVKGjQ
GoDadGo
08-10-2019, 08:36 PM
Congratulations Mr. T!
.Getting to this point is a great accomplishment.
Congratulations Mr. T!
.Getting to this point is a great accomplishment.
thanks GoDadGo. My dad is off camera cheering and it made for an awesome day!
JOP33
08-11-2019, 06:37 AM
Got it fired up for the first time today. Been working on it about 4 months so far.
Everything went fine but a couple minor problems. I have a 347 crate with sniper efi and full hyperspark ignition system. I'm very impressed with how well it ran right off the bat. It had excellent throttle response and idle immediately.
Only had a couple small problems.
1. The temp gauge immediately pegged. I suspect a bad ground?
2. The oil temp read 100 psi which seems pretty high to me. I'm thinking maybe wrong sending unit? Does anybody know which one is best for autometer ultra lite gauges?
3. I thought I had the fan all wired up correctly but it never came on. I shut it down before I had any overheating problems. I'm letting the EFI control the fan and have the light blue hooked up to the ground on the fan. Back at the harness, I have the orange fan wired u to the brown feed wire so it's constant hot. This is in lieu of having a toggle on the dash. Figure I'll test the power to it since the holley controls the negative ground wire.
I don't know if this will help or hinder you in your efforts as I also have the Holley Sniper EFI and below are a list of questions that I had for them as well along with their response and suggested relay set-up for the AC Shut Down (not sure you are running AC). As of right now on my build, getting the fan to engage has still been an issue and my plan is to have the shop that is doing the final fab and paint do a final inspection to see what I may have missed.
112180
112181
112182
FF33rod
08-11-2019, 08:46 AM
The fan output from the sniper is a ground as you mentioned but it cant handle the high current of the fan so it must be used in conjunction with a relay. I used it in place of the thermal switch that is placed in the bottom of the radiator in the FFR instructions
Steve
The fan output from the sniper is a ground as you mentioned but it cant handle the high current of the fan so it must be used in conjunction with a relay. I used it in place of the thermal switch that is placed in the bottom of the radiator in the FFR instructions
Steve
The fan hums like it's getting juice. So I need a ground trigger relay. Not sure what that is. I'm used to regular relays with positive trigger
Just puttering
08-11-2019, 09:51 AM
If you have a positive trigger, you ground the other side of the relay to complete the circuit.
If you have a negative trigger, you put +12 on the other side of the relay to complete the circuit.
What you are powering with the relay would stay the same.
FF33rod
08-11-2019, 11:06 AM
Simplest thing, meaning fewest changes and no added relays, is to put the fan wiring back the way the manual says. Take the wire that is intended to go to the fan thermo switch in the radiator (dark green in the front harness) and connect that to the sniper. Youre done. Dont need the thermo switch. This approach changes the ground trigger for the fan relay from the thermoswitch to the sniper