LSA ECU/harness and FEAD selection

[gearhead23]

I am building a 1973 Camaro and have put together a "homemade" LSA for it. My recipe includes a LS2 with forged internals, and adapter plates for the blower assembly. I have a BTR stage 3 supercharger cam and related valvetrain upgrades. I am using the t56 from the GTO that the engine came from. I think the LSA/ZL1 race drive set up from LSX concepts looks like the way to go for the FEAD with my stock subframe car. What I am struggling with despite a lot a research and phone calls is the best ecu/harness to use for this. I really like the Holley stuff and the displays, gauges, etc. that are available. I called their tech line and the gentleman told me they don't have a system for my engine. In his words he stated "we just can't control that engine". All the Dominator kits that come with huge injectors and even a Super Chevy article with a Holley ecu on LSA went through my mind but I chose to accept his answer because I know they don't have a canned LSA kit.
I think my 2 best options are:

1. Use the GMPP LSA controller kit which would require tuning and probably some complications because my LSA is just a LS2 with LSA blower. This means I have to find a tuner in the St. Louis area.

2. Use one of the Holley systems that are set up for boosted applications. I don't know if any of the self tuning features are going to get me even close with this choice. Tuning would still be required.

I know just enough about tuning to know I cannot do it.
I need to purchase my equipment from a vendor AND dealer who will help me with the selection and install concerns. I expect to pay for this, I am an equipment mechanic and don't apply my expertise for free. The Holley equipment and software looks like I could work with it a little and make some simple adjustments.

The more I learn, the more questions I have. Any help would be appreciated.

[mert.celet]

Hi Gearhead23,

In my opinion, Your best option is to go for the LSA pcm (E67). The car will start just with the basic tune of a regular LSA after You disable watts of course. You can just buy a used E67 from Ebay & a takeout factory harness. And Your good to go without forking out a large sum. BTW I am so happy with my HpTuners. It takes a while to learn how to tune but nothing beats the satisfaction of success.

[andrewb70]

Whoever you talked to at Holley is a moron. The Dominator is more than capable of running your engine without any issues. Even the HP can, but you would have to swap over to a cable TB. The Holley software is WAY easier to learn than HPTuners.

Andrew

[SSLOW6.0]

I am building a 1973 Camaro and have put together a "homemade" LSA for it. My recipe includes a LS2 with forged internals, and adapter plates for the blower assembly. I have a BTR stage 3 supercharger cam and related valvetrain upgrades. I am using the t56 from the GTO that the engine came from. I think the LSA/ZL1 race drive set up from LSX concepts looks like the way to go for the FEAD with my stock subframe car. What I am struggling with despite a lot a research and phone calls is the best ecu/harness to use for this. I really like the Holley stuff and the displays, gauges, etc. that are available. I called their tech line and the gentleman told me they don't have a system for my engine. In his words he stated "we just can't control that engine". All the Dominator kits that come with huge injectors and even a Super Chevy article with a Holley ecu on LSA went through my mind but I chose to accept his answer because I know they don't have a canned LSA kit.
I think my 2 best options are:

1. Use the GMPP LSA controller kit which would require tuning and probably some complications because my LSA is just a LS2 with LSA blower. This means I have to find a tuner in the St. Louis area.

2. Use one of the Holley systems that are set up for boosted applications. I don't know if any of the self tuning features are going to get me even close with this choice. Tuning would still be required.

I know just enough about tuning to know I cannot do it.
I need to purchase my equipment from a vendor AND dealer who will help me with the selection and install concerns. I expect to pay for this, I am an equipment mechanic and don't apply my expertise for free. The Holley equipment and software looks like I could work with it a little and make some simple adjustments.

The more I learn, the more questions I have. Any help would be appreciated.

Another option is Megasquirt 3 Gold. The software is free, plus built in logging. I prefer the interface, and if you're going to run Speed Density anyways its a good choice, but will take a little work to make the harness.

[gearhead23]

I agree with your statement about the tech guy from Holley and his answer to me. I just don't want to say anything negative about a company on the forum. This gets at the heart of my problem though. Holley has become a very big company and the amount of tech inquiries they get is huge. I said that I just "accepted his answer" may make my post sound naive but I knew at that point he did not have the knowledge to help me. I should have asked for someone who is a Holley EFI expert to contact me. I sent an email to Holley a few days ago
and have not got a reply yet. If I can make contact there who I can deal with
I would buy a dominator ecu and with the help of the representative all the other components. The right dealer could be a solution also. Holley has efi classes that look like something I would like to do but the KY
ones are all sold out for now.

[gearhead23]

What about going with a gm ecu and either a gmpp or speartech harness and getting tuning by Shane Hinds. He is just about an hour north of me. Just another idea. Anybody have any insight on this option?

[dhutton]

Not sure you can interchange Speartech and GMPP harnesses. They use different ECM’s if I remember right. Best give them a call.

Don

[TomMLS1]

Read this thread. You already have most of the recipe to make it work, no need to do anything fancy...not much different for your LS2...


https://www.pro-touring.com/threads/125915-Anyone-put-a-LSA-supercharger-on-LS3


T,

[gearhead23]

Thank you, that is a great LSA related thread. I am headed to SEMA in a couple weeks. Maybe I can get some more insight from a few vendors there. The GM LSA controller kit might be the way to go, I am studying the differences it would have from my LS2 computer and harness.

[TomMLS1]

What computer are you running on your LS2 currently?


T,

[gearhead23]

The LS2 is still on the engine stand and has never been installed in the car. I bought it from a drag racer who removed it from his 1800 mile GTO he purchased new. I bought the engine, trans and entire computer(e40-24x)/harness and accel. pedal. The serious drag radial guys go really crazy these days. That's what I have so I am not converting a running car. The car is just about to come off the rotisserie and I am trying to stay out ahead of things and get a FEAD and engine management ready to go. Doing the LSA set up on it complicates my original plan but to guys like us it makes it more fun!

[TomMLS1]

The GMPP LSA harness will use the E67 ECM and a T42 TCM. I believe that is 58X....really overkill, when you already have what you need to make this work...

A good tuner can do a few segment swaps and make it work just fine with your E40...

T,