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  #1  
Old 03-26-2008, 07:37 AM
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Billygoat Billygoat is offline
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Question Computer Controled Distributer

Any of you guys that run EFI, do you have a computer controled dizzy too?

If so - what dizzy are you using??

Thanks!!
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  #2  
Old 03-26-2008, 04:25 PM
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Anyone????????
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Old 03-26-2008, 05:14 PM
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For the L6s it's easy...just run the 4.0L FI with the 4.0L dizzy. The V8 is a bit more difficult, although there was a thread about it not long ago. I believe you can make either the TFI or HEI dizzies computer controlled. Look for a thread about small cap HEIs, that had a lot of good info.


aa
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Old 03-27-2008, 06:12 AM
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Serious Johnson Serious Johnson is offline
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Original 360 distributor with advance plate pinned down, TFI cap & coil, ignition controlled by GM ECU & knock sensor. Easy as pie and works fine.

S.J.
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"Carpe Mañana".

'83 Wagoneer
360, .030-over, K8600 cam, Crane springs, ported heads, Edelbrock Performer, G.M. TBI, TFI, 3" exhaust,
T-18a/208, D44/AMC 20 w/ limited slip in both, 3.73s, 33s, BDS 4" springs, Rancho 9000 shocks, etc., etc.
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Old 03-27-2008, 08:16 AM
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Billygoat Billygoat is offline
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I pulled up a couple old threads, and found exactly what I was thinking about doing with my MSD 8519, lock out the advance, and use a GM ignition modual.

Working with Howell (since I have there kit laying here in a box) and they can change my harness and prom over, and what ever other sensor (knock probably).

When I was talking to the tech at MSD, at first he said no way, but once I started asking the right questions (like is the magentic trigger the same in my dist and the GM computor control one the same) you could almost hear the light turn on.

I figure if I am going EFI, I may as well do it right....and the Edelbrock MPEFI kit is just a little to pricy.
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Old 03-27-2008, 10:39 AM
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Cecil14 Cecil14 is offline
 
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Yah, the only difference between a carb and TBI is less tinkering with the TBI once it's setup. The benefits otherwise (power, efficiency, etc) really aren't all that great. If you really want to bring it into the modern world you need fuel control AND ignition control. TBI really doesn't have either, it just dumps gas into the intake same as a carb.


aa
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Old 03-27-2008, 10:50 AM
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I know my TBI setup will not be as good as a full multi-port.
But with the added computer controled ignition, it should do somewhat better than a 4bbl carb. I am not expecting miricles.

However the "neat" factor of having an engine made in 1971, that is mounted in a 1981, and full computer control TBI.......
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Old 03-27-2008, 10:53 AM
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Cecil14 Cecil14 is offline
 
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Agreed, having ignition control on your TBI will make a ton of difference. Closed loop mode (O2 sensor) will help a lot as well. Next someone's going to be rigging up a newer setup so they can kill cylinders while cruisin down the highway. lol


aa
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  #9  
Old 03-27-2008, 11:11 AM
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Billygoat Billygoat is offline
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Quote:
Originally Posted by Cecil14
Agreed, having ignition control on your TBI will make a ton of difference. Closed loop mode (O2 sensor) will help a lot as well. Next someone's going to be rigging up a newer setup so they can kill cylinders while cruisin down the highway. lol


aa

I did seriously consider looking into that, no bs....................
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  #10  
Old 03-27-2008, 12:14 PM
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Serious Johnson Serious Johnson is offline
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Quote:
Originally Posted by Cecil14
Yah, the only difference between a carb and TBI is less tinkering with the TBI once it's setup. The benefits otherwise (power, efficiency, etc) really aren't all that great. If you really want to bring it into the modern world you need fuel control AND ignition control. TBI really doesn't have either, it just dumps gas into the intake same as a carb.


aa

GM TBI controls both fuel & spark. I'd say that the difference between TBI & MPFI is minute. Now something like a Holley or Howell that doesn't control spark is little more than an electronic feedback carburetor -- still better, but missing the critical element.

S.J.
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"Carpe Mañana".

'83 Wagoneer
360, .030-over, K8600 cam, Crane springs, ported heads, Edelbrock Performer, G.M. TBI, TFI, 3" exhaust,
T-18a/208, D44/AMC 20 w/ limited slip in both, 3.73s, 33s, BDS 4" springs, Rancho 9000 shocks, etc., etc.
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  #11  
Old 03-27-2008, 02:17 PM
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Cecil14 Cecil14 is offline
 
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The difference between a good MPFI and TBI is extreme. With TBI you're still depending on the intake to do a lot of the fuel delivery whereas with MPFI you're not. Plus, with MPFI you've got an injector at every cylinder so you get more control there as well.

For your standard setup TBI does a good job, with spark control as you said. For someone that wants more tuning and control MPFI is definitely the way to go if possible.


aa
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  #12  
Old 03-28-2008, 03:25 PM
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I talked to Howell today, they were interested in what I am doing.
No problem, sending them my harness and PROM to be reworked to control the dist, and adding the knock sensor and ESC.

So once I get it all done I will let evyone know how it works.
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