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Haxby, Thanks for starting this thread. Its got me thinking about an EFI conversion.
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Originally Posted by MEFIburn
(Post 3573338)
The MEFI is usually wired as a staggered batch fire, so you could look at it as a semi sequential type of setup for a port injected engine, firing half the injectors at a time. You can run pretty much any type ignition, most use a small cap HEI, but the aforementioned PSI blown 632's with 4B's now run a 58x trigger wheel and are set up like an LS7 with an individual coil per cylinder.. Going to the 58x setup was worth almost 100hp more over a small cap HEI on these engines. These used a VR crank sensor, and a slotted rotate-able trigger wheel mounted to the center portion of the harmonic balancer.
The E38 and EFILive is not a bad route to go if you do a MAF-less tune on it and just use the MAP sensor. I did an LS7 in a Porsche 911 with it and it was a wicked set up. At this point I have figured out the unlock codes for most all of the MEFI's from every manufacturer, so base tunes are available for everything from old Northstar's, to Ecotec's, to Ramjet's, to any LS engine, to any of the OEM setups. For a wideband O2 setup, much of the time I recommend the Innovate MTX-L or LC-1 with display. They are both about $170 off of ebay, and it comes with the Bosch wideband sensor included. It is a pretty nice deal. This is a great post, I have been wondering about the Holley HP units for some time, the info here is great as always. When I winterized my boat I noticed some unusual mist coming out of my headers, If I have a leak and have to replace them, I'm getting O2 bungs installed. My motor pulls 2.5" of vacuum at idle in gear, so setting the carb up for a good idle is a little difficult. Lord knows I love to have gadgets to play with, this may be the year for EFI. How is the LCD display for programming the Holley HP's? Can it be dash mounted? |
Just read that the Holley HP was on the winning engine at the Engine Masters competition. Easy to use and best performance not a bad combination. I may be moving to EFI after all.
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I used a GM 7727 MAP based ECU on my Formulas engine. Very cost effective and used a real-time emulator to do all the programming. Also running it in Closed loop. This is a 388 C.I. SBC 9:1 compression 425 HP and 444 Ft. Lbs.
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Originally Posted by ThisIsLivin
(Post 3575229)
How is the LCD display for programming the Holley HP's? Can it be dash mounted?
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Originally Posted by RdRacerZ28
(Post 3580028)
I used a GM 7727 MAP based ECU on my Formulas engine. Very cost effective and used a real-time emulator to do all the programming. Also running it in Closed loop. This is a 388 C.I. SBC 9:1 compression 425 HP and 444 Ft. Lbs.
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Our ZZ9 cam on a 114 LSA works great with the marine manifolds..... no reversion problems. I'm installing the Corsa Captians Call for this coming season. If I make any more power than I'll have outdrive problems. I just wanted an efficient engine, no big power. I doubled the HP of the tired 350 and added 100 ft.lbs over a 3000 RPM range. Peak torque is right at 4800 RPM, peak HP is at 5100. So far everything has worked out great.
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Originally Posted by RdRacerZ28
(Post 3580028)
I used a GM 7727 MAP based ECU on my Formulas engine. Very cost effective and used a real-time emulator to do all the programming. Also running it in Closed loop. This is a 388 C.I. SBC 9:1 compression 425 HP and 444 Ft. Lbs.
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I use Tuner Cat. The 7727 ECU was used in 1990-1991 Corvettes as well as many 3.1 liter V6 Cars. It is a weatherproof ECU. An "under-dash" equivalent was used in the 1990-1992 Camaros and Firebirds with the TPI SBC engine. The base program I use and start with on most retro-fits is from a 90-92 Camaro.
Originally Posted by ThisIsLivin
(Post 3580250)
What software are you using? What vintage is the 7727, I'm not familiar with that model?
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I have a question about this efi system......How would you go about connecting the mercury 10pin engine harness wire up to this system? does holley make an adapter or would a guy have to somehow have to hardwire somthing in2 the holley harness?
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