Holley EFI Question
#1
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Hi,
I am planning an LS swap project but I don't know anything about EFI or tuning. I have heard really good things about all things Holley and LS, but I can't find the answer to this question anywhere. Does the Holley EFI system (i.e. Sniper / Dominator) replace the factory ECU? Or would I need the factory harness and tie the Holley EFI systems into it? I bought a 6.0 that has everything except the harness, so I need to know if I need to replace that or if the Holley systems could potentially replace it.
Thanks,
Bobby
I am planning an LS swap project but I don't know anything about EFI or tuning. I have heard really good things about all things Holley and LS, but I can't find the answer to this question anywhere. Does the Holley EFI system (i.e. Sniper / Dominator) replace the factory ECU? Or would I need the factory harness and tie the Holley EFI systems into it? I bought a 6.0 that has everything except the harness, so I need to know if I need to replace that or if the Holley systems could potentially replace it.
Thanks,
Bobby
#2
TECH Senior Member
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Look online. Holley's site tells you what is included. I think you get the harness, ECU, and sensors. Pretty much plug and play.
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Old Geezer (05-03-2020)
#6
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I'm in the process of swapping a LQ9/4l80E into 1970 Cutlass, using Terminator X Max to control engine and transmission. Also using Holley mounts and oil pan. With Terminator you don't need factory harness or PCM.
Feel free to PM me if you have any questions.
Feel free to PM me if you have any questions.
#7
On The Tree
iTrader: (2)
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Hi,
I am planning an LS swap project but I don't know anything about EFI or tuning. I have heard really good things about all things Holley and LS, but I can't find the answer to this question anywhere. Does the Holley EFI system (i.e. Sniper / Dominator) replace the factory ECU? Or would I need the factory harness and tie the Holley EFI systems into it? I bought a 6.0 that has everything except the harness, so I need to know if I need to replace that or if the Holley systems could potentially replace it.
Thanks,
Bobby
I am planning an LS swap project but I don't know anything about EFI or tuning. I have heard really good things about all things Holley and LS, but I can't find the answer to this question anywhere. Does the Holley EFI system (i.e. Sniper / Dominator) replace the factory ECU? Or would I need the factory harness and tie the Holley EFI systems into it? I bought a 6.0 that has everything except the harness, so I need to know if I need to replace that or if the Holley systems could potentially replace it.
Thanks,
Bobby
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#8
TECH Senior Member
iTrader: (7)
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When installing any Holley EFI system into older vehicles, it is super important to get the wiring done correctly, otherwise you will have issues. I wrote this a little while ago and posted it on the Holley forum:
https://forums.holley.com/showthread...ey-EFI-systems
Andrew
https://forums.holley.com/showthread...ey-EFI-systems
Andrew