Join Date: Jan 2015
Location: Saint Pete, Florida
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 I still use today. He did a great job. The car is a daily driver and I have driven the car 30,000 miles to date with no issues. Runs awesome. As most LLT owner know, computer programming has some limitations and very difficult to do. In 2012, GM brought the LFX engine to the Camaro's utilizing a new Delphi computer system for control. This computer is so much easier to program for modifications, that better tuning refinements and horsepower extraction is easily accomplished.
With LLT's now getting higher mileage on them, I am researching the feasibility of transplanting the LFX engine in place of the LLT. This would allow a much better engine design, more inherent strength, a much better computer and more HP capability. I purchased a 2014 LFX engine complete and have it in my shop, researching this possibility.
So far, I have found out this much: The complete engine assembly will physically replace the current LLT with no modifications except the exhaust connections at the heads and no modifications to the body/chassis. That's silly simple and very easy.
Second, I have discovered that the same in-tank fuel pump is used on all Camaro V-6's. The engine wiring harnesses are different but to my surprise, the (2) body plugs are the same and will plug into the LLT. What I'm doing now is checking pin outs to see if any match. So far all of the LLT pin outs are the same as the LFX on the body plugs. The only issue that remains is that the LFX plugs have 8-10 additional pin outs that I am trying to identify. I believe they are used for a few extra options that were introduced on later LFX models.
It appears ( and I have NOT confirmed this) that you could plug the LFX body plugs into the LLT and the additional pins that the LFX has simply would dead end into the LLT harness and not be used, thus, making the electrical work with the LLT. The pin outs of both harnesses are identified as the same functions from the LLT to the LFX. If anyone can chime in on this and be of help, I would greatly appreciate it. This conversion would be great for LLT owners when they need engine replacement. LFX engines are readily available and cheap. A major upgrade, to say the least.
If the electrical can be worked out, this conversion will be a go for me. Other than very minor hookups, it's a piece of cake.