STAND ALONE ECU W/ FACTORY ECM?

TX_Hoonin · Jul 25, 2018

Has anyone in here have any knowledge on how to use a stand alone ecu such as AEM Ifinity or Holley in conjunction with the factory ecu so that i can retain accessory functions such as A/C, power steering, windows, etc?

mld54 · Jul 26, 2018

What vehicle, I'm pretty sure Haltech can do that on the newer cars.

TX_Hoonin · Jul 26, 2018

2012 GT500

SVTsteele · Jul 30, 2018

Would also like to know this for a 04 cobra, turbo setup, wanting to keep street features and obd2 for inspections if possible?

Eatonualive281 · Jul 30, 2018

Ditto

deepblue13 · Aug 1, 2018

I am actually working on this right now with my 2012 GT500 and AEM 708 with all the accessories. Although I do not need all the AC, radio, etc. I have been speaking to a company called Boomslang who makes a plug n play harness for the stock ECM to the AEM Infinity to retain the factory CAN Bus communication to still allow control for all those items. However, it uses the factory wiring harness and I am working with them to get the AEM Smart Coils added to the harness.

TX_Hoonin · Aug 1, 2018

deepblue13 said:
I am actually working on this right now with my 2012 GT500 and AEM 708 with all the accessories. Although I do not need all the AC, radio, etc. I have been speaking to a company called Boomslang who makes a plug n play harness for the stock ECM to the AEM Infinity to retain the factory CAN Bus communication to still allow control for all those items. However, it uses the factory wiring harness and I am working with them to get the AEM Smart Coils added to the harness.

Im familiar with Boomslang, but at the time i contacted them they had no harness for the gt500. You have to send your factory harness to them for modification?

deepblue13 · Aug 1, 2018

How long ago did you contact them? They’ve had a jumper for the factory ecu on their site for a while. Also have email from them regarding the expansion to include smart coils.

TX_Hoonin · Aug 1, 2018

deepblue13 said:
How long ago did you contact them? They’ve had a jumper for the factory ecu on their site for a while. Also have email from them regarding the expansion to include smart coils.

It was 2 months ago, but it could be because i was enquiring about a harness to be used with the Holley EFI stand alone

Eatonualive281 · Aug 1, 2018

Their site wont even come up for me

deepblue13 · Aug 1, 2018

TX_Hoonin said:
It was 2 months ago, but it could be because i was enquiring about a harness to be used with the Holley EFI stand alone

Yeah Holley is not listed on their site.

deepblue13 · Aug 1, 2018

Eatonualive281 said:
Their site wont even come up for me

Working good for me.

TX_Hoonin · Aug 1, 2018

deepblue13 said:
Working good for me.

So pretty much your saying if I’m using the AEM Ifinity stand alone and factory coils they have an harness for me to be able to run both?

deepblue13 · Aug 1, 2018

Yes. I sent you a PM.

They can now do smart coils as well if you want but it is an added fee to both main harness and new sub harness.

BigPoppa · Aug 1, 2018

Guys have been piggybacking ECUs since the MegaSquirt, Haltech, AEM, etc. first came out.

Many times, you can use one to drive larger injectors that the stock computer doesn't support when using it in a piggyback. That and engine swaps in cars with CAN bus.

While it is very possible to piggyback a stock ECU to get a car to meet OBD2, it isn't as easy as it sounds. Heck, it's hard enough to get Tricore and Copperhead cars to pass emissions with just long tube headers or no cats with the new rules many states have in place only allowing one "not ready" test, let alone making sure both computers play well with each other.

But, it IS possible.....

TX_Hoonin · Aug 1, 2018

BigPoppa said:
Guys have been piggybacking ECUs since the MegaSquirt, Haltech, AEM, etc. first came out.

Many times, you can use one to drive larger injectors that the stock computer doesn't support when using it in a piggyback. That and engine swaps in cars with CAN bus.

While it is very possible to piggyback a stock ECU to get a car to meet OBD2, it isn't as easy as it sounds. Heck, it's hard enough to get Tricore and Copperhead cars to pass emissions with just long tube headers or no cats with the new rules many states have in place only allowing one "not ready" test, let alone making sure both computers play well with each other.

But, it IS possible.....

Emissions isn’t a concern for me, it was just really retaining accessory functions i.e. A/C, steering rack, windows. I knew it was possible because I’ve seen street cars running Holley EFI, AEM, etc. But it’s hard to find info on how it was done. Boomslang has an solution for the AEM system, I’ve found no info on a parallel system using Holley EFI

98 Saleen Cobra · Aug 1, 2018

I have a Holley Dominator and no Factory ECU.. I have power windows, locks, power steering etc.. I removed ABS, Radio, A/C etc because racecar.. But I could havekept them all the same anyhow.. Lots of wiring was involved lol.

BigPoppa · Aug 1, 2018

TX_Hoonin said:
Emissions isn’t a concern for me, it was just really retaining accessory functions i.e. A/C, steering rack, windows. I knew it was possible because I’ve seen street cars running Holley EFI, AEM, etc. But it’s hard to find info on how it was done. Boomslang has an solution for the AEM system, I’ve found no info on a parallel system using Holley EFI

Because Holley doesn't support piggyback setups. Anyone doing so has to usually run dual sensors for a lot of items and Holley will not provide any technical support. Each of those systems is basically a one off.

I bet you Boomslang will be happy to build you a custom harness that supports the necessary dual sensors, etc., but you'll most likely have to provide them the custom wiring diagram.

smashedheadcat · Aug 2, 2018

SVTsteele said:
Would also like to know this for a 04 cobra, turbo setup, wanting to keep street features and obd2 for inspections if possible?

For an 04 cobra, all you need is a Haltech Elite 2500 with the patchloom harness. This will support what you're looking to do quite easily.

SVTsteele · Aug 3, 2018

smashedheadcat said:
For an 04 cobra, all you need is a Haltech Elite 2500 with the patchloom harness. This will support what you're looking to do quite easily.

That would still allow for obd2 to be read for emissions, i havent done too much research on it but everything i have been reading said that the aftermarker ecus wouldnt be obd2 compatible. Im trying to get into a boat where i dont need to get a tuner involved to make changes to my setup.

STAND ALONE ECU W/ FACTORY ECM?

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