LLT TO LFX ENGINE CONVERSION - ModernCamaro.com - 5th Generation Camaro Enthusiasts
V6 Engine Discussion 3.6L LLT V6 | Exhaust | Ignition | Induction | Intakes

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post #1 of 48 Old 08-12-2015, 06:14 AM Thread Starter
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LLT TO LFX ENGINE CONVERSION

I own a 2010 LLT Sequential Twin Turbo V-6, Automatic. My shop engineered, fabricated and installed the entire system. Vince at Trifecta did the tuning, which was great and still using today. He did a wonderful job and the car runs spectacular. It is a daily driver and I have driven 30,000 miles to date with no issues. As most LLT owners know, computer programming has limitations due to the Bosh ECM and very difficult to tune for maximum efficiency. In 2012, GM introduced the LFX engine, which is a much stronger engine and has higher horsepower capabilities. It uses a Delphi ECM, making it easy to tune by most tuners and more HP can be extracted through these tuning capabilities.

With LLT's now getting higher mileage on them and possibly needing new engines, my thoughts are to transplant a LFX engine with the Delphi ECM into the LLT. After much research over the past year, I purchased an LFX engine assembly, complete with wiring and ECM. It is in my shop on an engine stand and I have been evaluating feasibility.

So far, I have verified that the physical engine bolts right in with very few issues except for exhaust connections and very minor plumbing hook ups. Really easy. The in-tank fuel pumps on LLT'S and LFX's are the same, so no issue there. All other mechanical hook ups are the same. There are (2) body plugs that come off the engine wiring harnesses of both the LLT and the LFX's. After carefully looking at them, both of the physical plugs are the same. The pin outs of these (2) plugs are the same, as well, with the exception that one of the LFX engine side plugs have (4) additional pin outs and the LLT has (1) additional pin out in the fuse block plug. I feel pretty confident that these are for later model Camaro's that GM added features to.

My thoughts are that I could install the LFX complete engine/ECM assembly into my LLT, hook up the exhausts and minor cooling connections, etc. and plug the (2) body plugs into the existing mating body plugs on the vehicle and it should work. The extra pin outs on the LFX body plugs would simply terminate at the plugs and do nothing. I can't imagine GM changed anything that would not allow this to be done. Most everything is the same on the Camaro's from 2010 to 2015. Just additional options and features as the years progressed.

I need someone to chime in on the feasibility of this conversion concerning the extra pin outs on the LFX harness and help me further understand the compatibility. I am 95% verified on everything else. So darned close. If this works, this opens up the many, many LLT's that would qualify for this major improvement in a transplant. LFX engines are plentiful and cheap and the engine is a refined unit with much stronger internals, larger valves and better breathing characteristics for those who want more HP. Let's get our heads together to make this happen. I'm ready to do a transplant just as soon as I get my ducks in a row.
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Last edited by monty; 08-14-2015 at 07:22 AM. Reason: added info
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post #2 of 48 Old 08-12-2015, 12:15 PM
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Monty,
You are great at fabbing up the modifications. I cant wait to see how it does with a new computer!
Phil

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post #3 of 48 Old 08-12-2015, 02:09 PM Thread Starter
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Well Phil, I am so close, yet so far away. Just got to figure out those few remaining pin out on the LFX harness. My guess is that they will dead end into the Body plugs and not do anything, thus the connections should work. Just need to find someone that can help me define those pins for function. I do have the GM pin out diagrams with definitions but need to understand function as it relates to this conversion. I may be making a mountain out of a mole hill and could plug them in and everything works. I don't know.
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post #4 of 48 Old 08-13-2015, 02:13 PM Thread Starter
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Let's get some brains on this conversion. Somebody out there must be able to understand if this is feasible. Come on, guys!!
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post #5 of 48 Old 08-14-2015, 06:21 AM Thread Starter
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These are the only (2) body plugs that the engine/transmission entities communicate with the Camaro body/chassis. Each and every one of the wires from the LLT plugs are in the exact same location and defined by GM as the exact same function as the LFX plugs. They are the same physical plugs and plug into the body side on all 2010 thru 2014 V-6 Camaros. This makes the conversion 95% feasible.

As you can see, there are many pin voids in both plugs, allowing for GM to add further features to later model Camaros. Beginning in 2013, GM did, in fact, add several extra pins in some of those voids. My guess is that SOME features were added to the newer vehicles. But the rest of the pins functions the same in all models. The million dollar question is, since we would be installing the LFX into the LLT, we do not need those extra features because the LLT's did not have them, so why wouldn't simply plugging the LFX plugs into the LLT work and the extra pins from the LFX harness would simply dead end into the LLT's body side plugs because the body side of the LLT plugs do not have receiver pins in their sockets?

This is the only question that remains to do this conversion. Please note that the ECM's of both vehicles are completely married to the harnesses of each respective engine, thus no other wiring issues need to be considered.

The LFX plug on the left of the picture (X102) has (4) additional pins in new locations that were originally void on the LLT. The picture of the plug on the right (X50A) shows only (1) additional pin in the LLT, which is not in the LFX plug. That's it.
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Last edited by monty; 08-14-2015 at 07:17 AM. Reason: added info
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post #6 of 48 Old 08-15-2015, 11:34 AM
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Will be over this week to help Monty. See you then.
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post #7 of 48 Old 08-16-2015, 09:51 AM Thread Starter
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Great! You understand these Camaro's and I am sure you will be of great help.
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post #8 of 48 Old 08-27-2015, 04:25 AM
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What's the update on this conversion ?
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post #9 of 48 Old 08-27-2015, 07:04 PM Thread Starter
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We are 95% there on confirmation of a successful conversion but we have a few pin outs yet to identify. This is tricky stuff but it looks very promising. I have a brand new LFX engine waiting on a stand for my transplant when I am sure it will work. Note that if you have an automatic transmission, you will have to use the transmission that is same year as the LFX. Can't use the LLT, period, due to communication differences between the Delphi computer to the TCU.

Everything mechanically bolts up except a modification needs to be made to marry the exhaust pipes to the LFX heads, which is silly simple. In tank fuel pumps are the same on all Camaros, so no issue there. The (2) body plugs are the same, as well and will plug right in, so no issue there. We are trying to identify a few additional pin outs to be sure nothing will interfere with this transplant but it sure is looking very promising.

You will use the LFX engine wiring harness complete with it's computer and MAF. A few changes in hose connections and should be good to go with programming IF we confirm just a few remaining pin outs on the LFX harness. I am very excited about this and if it works, this is the only way to go if LLT engines should ever need replacing for any reason. LFX is a much stronger and advanced engine and can be precisely tuned for more power.

If anyone out there wants to try it, we have brought the level of feasibility up to 95% certainty. Will keep you informed. Please keep me informed of anyone that can add to the information on this potentially beautiful transplant.

Monty
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post #10 of 48 Old 08-29-2015, 11:17 AM
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Were at probably 98% certainty as I only have to confirm 2 more minor questions I have. This will be a huge plus for any with a failed/blown LLT to be able to do the conversion. The Auto trans as Monty states cannot be used from the LLT, it must be the MYB 5L60E version that started in 2012. The same controller works for the 2013-2015 and I am confirming 2012 as well (pretty sure it is the same).

We can put together a transplant "Kit" after all is confirmed, but so far there does not appear to be any real problem that can't be easily overcome. And with good used LLT's getting so hard to find (nearly all seem to already have substantial timing chain stretch and ALL have severe intake valve coking) there are plenty of low mileage LFX's out there.

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