Can I tune my 5.7 Marine engine in my Mastercraft?

[sikgmc]

I have a 1996+ GM Vortec Marine engine in my 2001 Mastercraft X-Star. I know where the PCM is, it has only 2 plugs compared to the truck PCM's 4. Is it possible to tune it?

[Bill@HPTuners]

I very highly doubt it.

[sikgmc]

I very highly doubt it.

Didn't think so, bummer.

[tahoe]

Related question, is it possible to tune LSx marine engines, say a 6,0 Mercruiser?
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[Bill@HPTuners]

Related question, is it possible to tune LSx marine engines, say a 6,0 Mercruiser?
//

It really would depend on whatever operating system/vin is in the pcm currently. You surely can try but nothing is guaranteed.

[EC_Tune]

Thought most of the Mercruisers used the MEFI III or MEFI IV series controllers? If so, no dice.

[jeff]

Would they even have a ODBII port?

[1slowhoe]

Bumping an oldie. Has this changed? I dont know what ECU the new 5.7L and 6.2L Mercruisers use but I thought you guys might

[rassetr]

The 6.2 has MEFI 5c

[sssnake]

Bumping a very oldie.

What prevents the HP Tuners scanner from working with an MEFI ECU (specifically MEFI IV). The serial data output for the MEFI IV controller is on pin G of the connector. With a crossover connector you could get that data to pin 2 of the MVPI pretty easily and the ground pin A over to pin 10 of the MVPI. GM developed the MEFI controllers so I can't imagine the serial data stream is vastly different.

I know I could use TunerPro RT (which I have) but it is not nearly as user friendly as HP Tuners and I would prefer not to have to learn another software set unless absolutely necessary.

Just to be clear I would not be looking to write to the MEFI controller just scan/monitor.

[Keith@HPTuners]

The MEFI 5 is a 250kb CAN bus.

We plan to release reading/writing/licensing/scanning soon. We already have it working on my race car.

Stay tuned!

[mod11]

Keith, any updates on the mefi writing?

[Keith@HPTuners]

Reading/tuning/writing fully works. We just need to work out the licensing part. I expect we'll get to that in about 2-3 months.

[TurboCamaro]

Have you made any progress with the MEFI5 (&6)

[rs2112]

Mefi 1-4 have their own cable mefi 5&6 requires a can cable adapter . Most use Diacom to read the ecm. Maybe hp will come out with something but for now I scan with tuner pro and write with mefi burn. You also have to have a password to unlock the ecm.

[96LT4C4]

This is an old thread, but I am digging it up because Keith@hptuners said it was coming. Just wondering if I missed something. I am building a 383 for my boat and would rather not spend $600 for Mefi Burn if Hptuners can do it.