Transducer swap

pog mo thon

Member
Aug 20, 2008
177
Metedeconk river, brick NJ
Boat Info
sea ray 320 sundancer v-drive
Engines
twin 350's
Does anybody know if that through hull dt 800 transducer shown in the first picture below can be used in place of the old factory installed depth finder Smartcraft Mercury-Mercruiser 79-8M0122507 Sensor Depth/Temp shown in the 2nd picture with the same hole?
I have new electronics and my smartcraft depth finder is no longer working anyway.
( I am not referring to the cable or any comparison between the 2. I just want to find out if I can use the same through hull).

Thank you.

89054D59-3672-41F9-8DC6-21171315161D.png

upload_2020-5-8_18-21-11.jpeg
 
Third Question here as I have a new Garmin GPS and wondering where else in the hull I can install the GT15M-IH transducer without it interfering with the Airmar one... any ideas?
 
Third Question here as I have a new Garmin GPS and wondering where else in the hull I can install the GT15M-IH transducer without it interfering with the Airmar one... any ideas?
You can mount yours anywhere without interference. It’s a mid-band CHIRP model that operates on a different frequency than the Smartcraft one.

Follow the directions for mounting the shoot- thru ‘ducer.
 
Compatibility depends upon the existing retractable housing. There are two basic housing types ones with integrated valves and ones that are open. Then some are longer than others and some in differing diameters. Assuming, based upon your pictures that your transducers are same length and same diameter then -
If your housing has the valve then use the yellow O-ring (larger one) if you have a housing without the valve then the black O-ring must be used.
 
I figure that I will just leave the one in the boat for now and not try to reinstall the "wheel" in this case. When I pull these 350 Mag slugs in the next few months to install the new LSAs, I'll remove anything in the boat that has no purpose.
 
I figure that I will just leave the one in the boat for now and not try to reinstall the "wheel" in this case. When I pull these 350 Mag slugs in the next few months to install the new LSAs, I'll remove anything in the boat that has no purpose.

LSAs, at 550 + hp what drives will you using?
 
LSAs, at 550 + hp what drives will you using?
Good point.

A standard Bravo 3 drive won't take that much power. Currently, Mercruiser materials show that any big block engine has to be mated to X or XR type drive (Bravo 1, 2, or 3 types). I've seen a couple things that state the upper limit is 400 hp for a regular Bravo 3, but Mercruiser pairs all of their big blocks with the X and XR.

There's the gear ratio to consider as well.
 
Lots of great questions...

Since no reputable marine shops wish to test Mercury's allocation restrictions on new outboards by swapping anything remotely from this decade into a Mercruiser powered vessel, I bought my SeaRay to create a really great powered package.

The LSAs will initially go into my 43' Scarab AVS that currently has triple 500 EFI Mercury Racing 502s. They weigh in at just over 1000# each and make a measly 475hp with an RPM limit of 5200 thru Bravo II drives and 30" Bravo props. The boat will go 81mph GPS with 200+ gallons and five people on board. When the development of the LT5s is complete, I will swap those into place.

The SeaRay 290 SS SLX will initially get the newest of GMs lightweight direct injected, variable cam timing 6.2L truck engines that make 435hp a 4k thru 6400rpm and with the cam timing active, as much as 420lb/ft of torque at 2000 rpm. These engines weigh 488# complete with the closed cooling system which is a 320# savings each from the 350Mag MPI it replaces without the cooling system. The original 350 Mags were rated at 245hp which most import 4cyl cars can best that in today's selection.

The Bravo 3 (BIII) drives are nearly the same uppers with an exception being diesels having stronger gears due to the lower rpm and higher torque. The Achilles is the lack of lift provided by dual props and prop selections. For the simplicity initially, my plan is to replace my rack steering system with a Latham dual cylinder ram hydraulic and keep the BIIIs with the L86/96 Di engines, changing to the Hill 28" 4-blades to see what limits can be found or until they blow up. After that I will switch to dual Imco SCX2 drives with a pair of Bravo Maximus 5-blades with the longer barrel to help lift the hull evenly. I'll round with a pair of Latham 28" trim tabs for stability.

For once in the History of SeaRay boats... I want to get to Bimini from Haulover and back on one tank of fuel and in less than four hours.

Here is the complete L86Di that is a direct drop in for any gas Mercruiser, Big or Small block.
E62L86.jpg


81257387_10216005965043933_2958546178414739456_n.jpg


If you know how to run your throttles at speed, timing the waves and boat... you can make the Bravo XRs live within extreme abuse. I prove it all the time with my brother's 43' Black Thunder pictured below making the run from Haulover to Gov Cut at 68mph in some nasty water. This boat has twin 540 Dart block AFR head engines making over 600hp NA. It has a Gen, AC, and a full cabin.

86831338_10216386309312302_1542682356425424896_o.jpg
 

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