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Old 11/10/18, 03:47 PM   #1
Full Member
Joined: Jan 08
Posts: 282
Holley Sniper EFI ?

I installed my sniper efi this summer and have been very pleased with it however the temperature has fallen here in the Carolinas and now I canít get my coolant temperature over 170. Problem is that it stays in closed loop mode until 180. Should I just get a 190 degree Tstat? I cant be the only one with this issue....

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Old 11/10/18, 03:55 PM   #2
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Greeley, CO
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Most EFI systems need the engine to run warmer than was the practice with carbureted engines, this is why newer engines usually have 195 degree thermostats.
While I have no specific knowledge of the Holley system I would go with a 195.

... I've got skills, ingenuity and no regard for maintaining any kind of historical preservation or authenticity...My Dad called that sick and wrong
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Old 11/10/18, 06:12 PM   #3
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Maricopa, AZ
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How is your engine built? If pretty stock, get a good 192 thermostat. I like the Motorcraft stock (factory) replacement for an early 90's mustang GT. It is a high flow unit as well. The engine will run better, more efficient, and last longer. If you have a nasty 11:1 compression motor, different advice.

I also believe there is a setting in the Sniper to lower the closed loop switching point. Not sure if it is in the hand held controller or if you need the PC interface. Give Holley a call and talk to them. They are known for really good customer support.

"She's built like a steakhouse but she handles like a bistro"-Zapp Brannigan
Why do people keep expecting "normal" from me?
Full throttle, it either solves the problem or ends the suspense.
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