LS Swap Seafari 25

[Xcomunic8d]

I ended up ordering one of these for my front splitter out of the LS water pump into bottom manifolds. I’ll post pics when I can. It’ll be a lot lighter and cheaper than this brass setup below

https://www.hardin-marine.com/vsearc...rchTerm=300373

Before



After. Might make it a little cleaner yet. But big thing is weight in the hose out of the pump. It’s much lighter.


Ps yes that is masking tape holding the maf on until I get the right coupler shipped in.

[Fr. Frank]

Just a note about oils: The 2003-2013 5.3 LS motors used oil pumps rated for either SAE 5w-30 or 5W-20. Later motors ALL had pumps rated for 0w-20 oil. In my 2014 Silverado the dealer said I could safely increase the 0w-20 to 5w-30 for long distance towing but not to ever use a higher viscosity than that as thicker oils put excessive strain on the pumps. Not knowing anything different or better, I've followed those guidelines with regular 5K full synthetic LOF schedule, and just turned 337,000 miles. Just something to consider.

[Xcomunic8d]

So good points frank. What rpm is your engine pulling on long haul towing? Over 4K? The big concern I have is the results of pulling 3-5k rpm for extended time.

I did put in a good after market pump (not a high volume to avoid draining the pan). Also a major problem from mid 2000’s on is that DOD garbage. Under the valley plate is a series of sensors and stuff that shuts off the lifters at certain rpm. A major issue are those lifters collapsing.



Vs the ls7 lifters here



This is why DOD deletes (LOMA, AFM- all same thing) are so popular. In addition, vvt and a cam phaser can be part of this but my gen 4 didn’t have vvt.

So what they told you makes sense for a stock engine (with DOD and VVT) running in cold weather. As 5w and 0w are the measurements for how it will flow at colder temps. Here in Hawaii as in FL it’s pretty warm all the time.

What’s got me scratching my head, there doesn’t seem to be a standard-Crusader has one and VP has one -they are both using LS now are calling for much thicker oils over GM’s factory specs. I actually called Royal Purple to discuss this but couldn’t reach anybody. There are even some guys running VR-1 a race oil at 20w-50 in boats and race cars with great results. However I’m not sure a standard volume pump can handle that. I’ll do some more research on that.

[Fr. Frank]

My engine still has the Active Fuel management, but I've noticed that in Trailering mode, it does not activate, even at slower speeds.

I turn about 3000 rpms at about 63-65 mph on the highway pulling either my boat or my 20' drop-tail trailer with my Jeep on it. I get about 13.5 mpg hauling the Jeep, which on the trailer with my old BMW motorcycle together weighs about 6,300 lbs.

Without the trailer and in trans normal driving mode I turn about 1700-1800 rpms at the same speed and get about 19.8 mpg.

[Xcomunic8d]

Hey, hey. Look what came to me today!





Custom riser spacers… now to paint and install

[Xcomunic8d]

Here is the test fit. Should be installing tomorrow and getting it started soon I hope.

[Xcomunic8d]

So today we tried to start it up. Crank no start. The ligenfelter trg-002 is blinking all red indicating no crank shaft input. I did reuse that sensor. I purchased a new one this evening and will be installing and go for start tomorrow.

I told wife I should just fire it up at 9pm tonight and was given a very stern no… especially as she teaches the police officers kids who live 2 doors down from me.

Oh well. Morning is coming. Maybe 0600?

[Water Rat]

Good luck! I have a new 454 in my 1978 23' Sceptre that has not been run yet myself (waiting for boat to be finished from a project that has taken WAY too long). Please post pictures and I'm sure the neighbors will understand.

[Xcomunic8d]

Sounds great water rat. Still no joy yet. I’ve got to double check spark and some wiring issues from this harness. I think I’ve identified the issue.

On the plus side the crank position sensor turned the trg from blinking red to all red. Meaning not talking to pcm. I think the pcm has a power supply issue from this harness. Another day of trouble shooting ahead.

[Water Rat]

Ugh, I feel your pain. I'm sure nothing that several hours and a few ounces of blood and sweat won't cure. Good luck and keep us posted.