ALPHA 1 strength? - Page 5

spareparts · #41 04-04-2007, 09:29 AM

the merc tech is right, the ecm will have to be changed to allow the shift interrupt to work with the alpha( i tried this a coupe of years ago), I'm not sure about straight wiring in a shift intrerupt to the coil, it may damage the coil driver, I thought about interupting the IAC but it would throw codes everytime it activated. That throtttle body motor is more than enough for that V. Keep the MPI/Bravo for the next project

spareparts · #42 04-04-2007, 09:29 AM

the merc tech is right, the ecm will have to be changed to allow the shift interrupt to work with the alpha( i tried this a coupe of years ago), I'm not sure about straight wiring in a shift intrerupt to the coil, it may damage the coil driver, I thought about interupting the IAC but it would throw codes everytime it activated. That throtttle body motor is more than enough for that V. Keep the MPI/Bravo for the next project

THEFERMANATOR · #43 04-04-2007, 02:49 PM

It aint goin in a V-20, it's goin in a 250 SEARAY CC. The late model shift interupt switch works by breaking the circuit for the coil driver, vs the old style that grounds it. But I was told that if I interupted the signal the ECM would throw a code and go into safe mode everytime I took it out of gear.

Slightly larger(and heavier) than a V-20

THEFERMANATOR · #44 04-04-2007, 02:49 PM

It aint goin in a V-20, it's goin in a 250 SEARAY CC. The late model shift interupt switch works by breaking the circuit for the coil driver, vs the old style that grounds it. But I was told that if I interupted the signal the ECM would throw a code and go into safe mode everytime I took it out of gear.

Slightly larger(and heavier) than a V-20

Skools Out · #45 04-04-2007, 08:20 PM

i know you don't want to listen but it will be fine My 250 has the Alpha 1 with a 330 HP no issues, has 675 hrs

Skools Out · #46 04-04-2007, 08:20 PM

i know you don't want to listen but it will be fine My 250 has the Alpha 1 with a 330 HP no issues, has 675 hrs

THEFERMANATOR · #47 04-05-2007, 12:26 AM

My big hurdle with the bigger engine is the ECM and the shift interupt switch. The ECM on my 315HP is actuaully programmed for an inboard and a shift interupt will drive it nuts. My 260 TBI motor is already wired for the interupt and a direct match for the ALPHA1's origanal engine's output. I just want this thing gone and done, I want to get me a 26' BERTRAM or a WELLCRAFT 248(but that's just me).

THEFERMANATOR · #48 04-05-2007, 12:26 AM

My big hurdle with the bigger engine is the ECM and the shift interupt switch. The ECM on my 315HP is actuaully programmed for an inboard and a shift interupt will drive it nuts. My 260 TBI motor is already wired for the interupt and a direct match for the ALPHA1's origanal engine's output. I just want this thing gone and done, I want to get me a 26' BERTRAM or a WELLCRAFT 248(but that's just me).

spareparts · #49 04-05-2007, 12:26 AM

if I were going to keep it, I'd put the 5.7 MPI/Bravo set up in the Sea Ray, see if you can trade around and end up with a Bravo III lower, it makes a big difference in boats like that 250( i worked at a Sea Ray dealer for 6 years, I 've seen the difference in take off and cruise performance)

spareparts · #50 04-05-2007, 12:26 AM

if I were going to keep it, I'd put the 5.7 MPI/Bravo set up in the Sea Ray, see if you can trade around and end up with a Bravo III lower, it makes a big difference in boats like that 250( i worked at a Sea Ray dealer for 6 years, I 've seen the difference in take off and cruise performance)