• Welcome to For E Bodies Only !

    We are a community of Plymouth Cuda and Dodge Challenger owners. Join now! Its Free!

Holley Terminator X EFI - where did you mount the ECU?

rmchrgr

Active Member
Joined
Feb 27, 2025
Messages
28
Reaction score
20
Location
Stamford, CT
For those that have converted to Terminator X EFI, where did you mount the ECU? Seems like there is not a lot of room under an E body dash especially since I am going to have A/C. Frankly, the Holley provided wiring in useless - it's bulky and has connections in seemingly random places so I've pretty much resigned myself to get an unterminated harness to make things easier. However, that does not solve the question of where to put the ECU itself.

The interior of the car (Challenger) is out so now's the time to hash this out. Currently, I'm looking at the flat area under the driver's side cowl to mount the box but it's a not great location since with the dash in place it might be a PITA to access if needed. Also looking at putting it under the seat but then there are a bunch of wires to hide under the carpet and it's much farther away from the engine compartment.

To be clear, the Sniper ECU is mounted in the throttle body itself. Because of that design, it is susceptible to EMI/RFI which can cause problems. The Terminator X ECU is a completely separate box which essentially eliminates any electronic interference. It's just a bit more of a pain to wire.

Any ideas and hopefully pics. of how you've mounted a Holley ECU in your E body are appreciated.

Thanks!

- Greg
 

MoparCarGuy

Well-Known Member
Joined
Jun 28, 2020
Messages
821
Reaction score
694
I mounted the ECU at driver’s side cowl just like you mentioned. Harness and wiring worked out well. I mounted the Hyperspark ignition module at the center tunnel area just above where the carpet ends.
Search for my other posts on Terminator X for more info.
When I get a chance I will post some specific pics of the ECU for you on this thread.
 

rmchrgr

Active Member
Joined
Feb 27, 2025
Messages
28
Reaction score
20
Location
Stamford, CT
I mounted the ECU at driver’s side cowl just like you mentioned. Harness and wiring worked out well. I mounted the Hyperspark ignition module at the center tunnel area just above where the carpet ends.
Search for my other posts on Terminator X for more info.
When I get a chance I will post some specific pics of the ECU for you on this thread.
Awesome, thanks!

Seems like there are not too many EFI guys here.
 

MoparCarGuy

Well-Known Member
Joined
Jun 28, 2020
Messages
821
Reaction score
694
I took the pictures of the ECU location. Hope this helps.
Terminator X ECU Location at DRIVER SIDE COWL 2.jpeg
Terminator X ECU Mounted under DRIVER SIDE COWL.jpeg
 

rmchrgr

Active Member
Joined
Feb 27, 2025
Messages
28
Reaction score
20
Location
Stamford, CT
Thanks for the pics, much appreciated. Confirms that there is actually very little room in that area.

I have multiple little boxes that I will need to find homes for so this is not going to be an easy decision.
 
Back
Top