Will the L26 (3800 aspirated) swap out my 03 GPSE 3100??

[nevillekilcc]

I want to maximize engine capacity and power in my 03 GP. I am always told to go for the 3400 SC but I feel the 3800 would have a better chance for long range growth! Help I am so unsure :/

[Explicit_Spade]

Without spending much time and money swapping the entire powertrain and electronics... No.

[Slick2500]

Wouldnt you only need the PCM engine and harness cuz everything else is the same.

[Explicit_Spade]

I thought the trans was something else... Maybe I was looking at pregen.

Are the motor mounts the same? If not you'd still need the cradle.

[Slick2500]

As far as I know they use the same motor mounts. I would have to check.

[BillBoost37]

Mounts are the same, I'm not positive if the downpipe is the same, but most stuff is fairly straight forward with teh wiring harness swap.

[nevillekilcc]

I'm gonna check out the wiring diagrams and I will prolly pick up on to stary immediately!! Thanks!!!

[blueguy]

Just be sure to change fluids, plugs, wires, top end gaskets, etc...

You will need/want a full PCM tune...as the L26 uses a DBW TB that you can't use like the '04+ cars did.

However, you can get a GenV to L67 TB adapter plate...and run an L67 TB with it.

I would, while the motor is out, recommend a 2.5" or 3" catted downpipe from ZZP to let it breathe.

Other than that...replace the mounts while you're in there as well.

[BillBoost37]

You could just look up my recent thread about putting an L26 into my SC regal. lol