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Old 07-30-2020, 01:34 AM   #1
lts70
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Default Subaru 2.5l powered Mini jet Boat

Trying to figure out what engine is in my newly acquired mini jet boat. The guy that built it purchased the motor from an import engine supply. He used components and wiring from a 2000 forester. Here are some numbers I found cast and stamped onto the engine.

Z25, FM-1, 001, 296304295045, 740389, 740306, and Japan Z25

Any help would be greatly appreciated.

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Last edited by lts70; 07-31-2020 at 02:07 PM.
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Old 07-30-2020, 02:55 AM   #2
bobjr94
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What's stamped on the top front, by the alternator. EJ20, EJ25 ? And if you post a picture it may be easier to identify. Single cam I would assume, no turbo, cast or plastic intake ? And is the sticker on the timing cover still readable ? It may start with like ej251...
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Old 07-30-2020, 10:39 AM   #3
Samurai Jack
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Quote:
Originally Posted by lts70 View Post
Trying to figure out what engine is in my newly acquired mini jet boat.
Why don't you simply go back to whoever you bought it from and ask them?
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Old 07-30-2020, 11:58 AM   #4
lts70
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All he could tell me is that it is a 2.5l
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Old 07-30-2020, 12:57 PM   #5
lts70
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I was able to have the import engine supply company email me the invoice.
it has that it is a 99-05 Legacy/Outback EJ25 SOHC non VVT with less tan 55,000 miles.

The original owner Installed the computer, wiring harness (reworked by enginewiring.com), intake and fuel system from a 2000 forester L 2.5l, h4 (150ci) vin(6)on to this motor.

I am hoping to do some simple bolt on performance mods like Lighter pulleys as well as a tune as I would think the fuel maps would be off now that it runs a boat and not a car.

any advice would be greatly appreciated as this is my first Subaru.
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Old 07-30-2020, 01:01 PM   #6
shagfagon
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imagine going through the effort to put a forester motor in a boat.

In for pictures
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Old 07-30-2020, 01:03 PM   #7
shagfagon
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Sorry bub but there is no way to tune that ECU.

Keep the stock intake system. Whats the exhaust setup look like?

Lightweight pulley is about all you can do to "free" up some horsepower.

There really isn't anything you can practically do that will make it faster without wasting a **** ton of cash
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Old 07-30-2020, 01:37 PM   #8
lts70
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Is there an ECU that I could get that would be programmable and work with my existing motor?
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Old 07-30-2020, 03:27 PM   #9
shagfagon
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Yes, any standalone ECU.

You don't have emissions to worry about since its not a car. So literally any single computer in existence that you can get to control the injectors and the spark plugs and the fuel delivery will work.

You have a LOT of reading ahead of you if you want to go that route.
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Old 07-30-2020, 03:53 PM   #10
lts70
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https://www.delicioustuning.com/node/782

This looks promising

Introducing the Delicious Tuning Spork complete stage package. Finally a complete solution for the 1998-2000 V5 / V6 JDM Subaru, 1999 - 2002 Subaru Impreza 2.5RS, Subaru Impreza 2.2L, Subaru 2.5L Forester and Subaru 2.5 Legacy GT. With the ability to datalog, review check engine lights and optionally, remote tune your vehicle this is the ultimate solution for all level of builds. With the ability to remote tune your vehicle we can dial in the tune and will be offering custom Flex Fuel support for these model vehicles.

Unique features of the Delicious Tuning Spork.
- Program your vehicle's ECU through a Bluetooth capable laptop using the link on our INFO page.
- Plugs directly into OBD2 port uses very extremely little power and can be just left in, no wiring or software drivers required.
- Integrated data logging and check engine light software so you can send logs to us for review.

Complete Package Includes
- Delicious Tuning Spork OBD-II Dongle
- Delicious Tuning Spork ECU License
- Delicious Tuning Stage Map

The Stage Map tuning options for these vehicles are as follows.

Last edited by lts70; 07-30-2020 at 04:13 PM.
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Old 07-30-2020, 04:07 PM   #11
GalaxyWide
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Open Source ought to have at least some tables defined for that ECU, though there's not a ton you can do to improve an NA Subaru tune.
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Old 07-31-2020, 08:56 AM   #12
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Quote:
Originally Posted by Its70
Trying to figure out what engine is in my newly acquired mini jet boat.
Has this set-up ever even been running in the boat?

Good move getting the invoice from the Importer.
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Old 07-31-2020, 09:16 AM   #13
lts70
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Yes it starts right up an runs good. The 1K ohm resistor Enginewiring.com put in place of the evap system is not tricking the computer. So I may need to put an actual valve and canister to get rid of the check engine light. I was just hoping for the ability to fine tune and pick up a little bit more performance.
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Old 07-31-2020, 11:18 AM   #14
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Anyone have any experience running a Piggyback ECU? Something like this.




Piggyback SMT8 engine management ECU to tune engine

SMT8-USER KIT $700.00 plus shipping

SMT8 User Kit:

1 x SMT8 Standard Piggy-Back Controller
1 x SMT8 Tuning Harness
1 x USB Communication Cable
1 x CD with LetRipp Software and Manuals

The SMT 'piggyback' ECU is designed to correct fueling and timing. This is a wire in unit that can be sent to meet the needs of your car. The SMT is simple to install, (must be soldered in) and includes wiring diagrams, and installation instructions. The SMT can be programmed by you using the 'tuning cable'.

The SMT8 piggy-back system has unparalleled performance and a quantum leap of technical innovation. This is all possible with the latest 16 bit DSP processors, crammed full of features that you've never seen before. T

One of the new features is the fully programmable engine protection, which monitors the engine's performance. Should anything exceed the engine's specifications, the SMT8 will gradually reduce the engine's power after a programmable time delay, in essence looking after your engine. This is absolute MAGIC!

The external display output is also new for the SMT8 series. It allows our digital display to receive data from the SMT8 and selectively display the desired value without the presence of a PC. The displays are small with bright attractive LED colour options. Multiple values can be displayed on a single display by simply toggling between them.

An average installation consists of connecting 6 wires to the vehicle's ECU wiring loom, changing the settings of the SMT8 in the setup section of the LetRipp II Tuning Software and voila - you are ready to re-tune the vehicle. An experienced installer can install an SMT8 unit within 30 minutes for a basic installation. The primary features of the SMT8 will take longer to install, simply because there are more wires, but it is worth the wait.

The SMT8 can drive one extra injector (13 ohm) for supplementing fuel at high boost. The extra injector can be controlled via Throttle/RPM, AMP and Engine Temp maps. This allows for precise fuel delivery at boost conditions - a feature which is very popular with turbo and supercharger installations.

Set-points is a feature which makes the SMT8 stand apart from the other piggy back chips. It allows for the implementation of gear shift lights, fan control, idle assistance to mention a few. It has three relay outputs which can be switched on via 14 different signal sources. All Set-point functions can be combined in a logical fashion, and full polarity (higher than/lower than) selection is possible, even switching between the two operating maps is possible.

Two full operating maps (Map A and Map B) are present in the SMT8. Each operational map is capable of being switched into operation in real time while you drive or even when your Set-point function comes true. Switching between the two maps can also be achieved by having an external dash board switch installed, having one operational map for max power and the other for fuel consumption. The options are endless! The LetRipp II Tuning software is able to switch and lock operational maps to facilitate the tuning process.

Two wide band LSU-4 channels can be tuned simultaneously with the SMT8 version 3. This is feature is the major difference between version2. A large 16 x 24 map (384 tune sites) allows for the precise AFR (Lambda) signal modification via the two wide band inputs and outputs. The AFR is mapped via Throttle/RPM, AMP and Engine temperature. Two narrow band AFR (Lambda) probes can also be tuned simultaneously with the two wide band probes. This feature is invaluable for V6 and V8 applications where there are two wide bands probes and two narrow band probes. All 4 lambda probes can be tuned at the same time with one SMT8 unit.

Detailed HELP is available on the unit while the software screen is open. Simply move your mouse over an item and right click and hold down the button. A help description will appear detailing the function of that item. This help feature is invaluable because you get the help from the unit and not from an out of date printed manual. The software manual is also provided with every purchase and should be used as a reference guide, where the item help should be treated as the Holy Grail.

The mapping of all this is done via a high speed USB port and the user friendly, state-of-the-art LetRipp II Tuning Software. All tuning is done in real time and all entered values have immediate effect on the operation of the unit. All in all the SMT8 is the best piggy-back system on the market.
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Old 07-31-2020, 11:55 AM   #15
GalaxyWide
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I don't know why it wouldn't work, but also seems like overkill...how much are you thinking you can gain by tuning an NA Subaru engine?
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Old 07-31-2020, 12:39 PM   #16
lts70
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I just figured that now that all of the car related items are stripped off (Ac compressor, Power steering pump, smog, transmission, ect.) there would be benefit to tuning it to better suit a boat for efficiency and power.

I have older vehicles form the 60's and 70's so this is all new to me. I was just hoping I could tailor the ECU more to the engines new life as a boat power plant. If that is not possible it runs good now so no big deal. If it is possible I don't want to pass up on that opportunity. A little more power would go a long way in a little boat like this.

Thanks for the comments this is a great forum.
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