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305 to 350 Computer/ECM

Old Jun 18, 2013 | 11:26 AM
  #1  
dmwracing42's Avatar
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From: CT
Car: 1984 Trans Am
Engine: 355
Transmission: T-56
Axle/Gears: 10 Bolt, Torsen Diff, 3.73's
305 to 350 Computer/ECM

So I'm doing a 305 to 350 swap on my '84 T/A. I don't have to go through emissions anymore, so all of that stuff is going away. I'm trying to decide if I want to lose the computer, or if I could hook it back in to the 350. Anyone have any idea what the computer actually controls (I'm not using the CCC on the 350)?

An older tranny is going in, so lockout won't be an issue. Is the fan ECM controlled? And would the fuel pump in the gas tank be as well (I'm pretty sure I have one, as my car is H.O.)? Is there anything else I should consider with removing the computer, or would my life be easier just sticking with it. And if I do that, how do I go about using it for the 350?
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Old Jun 18, 2013 | 07:19 PM
  #2  
vetteoz's Avatar
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: 305 to 350 Computer/ECM

Originally Posted by dmwracing42
Is the fan ECM controlled?
And would the fuel pump in the gas tank be as well
I think in your year the fan is from a switch in the head , if electric the fuel pump is easily rewired to run off the Ign switch
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Old Jun 19, 2013 | 11:13 PM
  #3  
827-snyWA's Avatar
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Car: 88camaro
Engine: carburated 350
Transmission: th350
Axle/Gears: 3.73 posi
Re: 305 to 350 Computer/ECM

Originally Posted by dmwracing42
So I'm doing a 305 to 350 swap on my '84 T/A. I don't have to go through emissions anymore, so all of that stuff is going away. I'm trying to decide if I want to lose the computer, or if I could hook it back in to the 350. Anyone have any idea what the computer actually controls (I'm not using the CCC on the 350)?

An older tranny is going in, so lockout won't be an issue. Is the fan ECM controlled? And would the fuel pump in the gas tank be as well (I'm pretty sure I have one, as my car is H.O.)? Is there anything else I should consider with removing the computer, or would my life be easier just sticking with it. And if I do that, how do I go about using it for the 350?
fuel pump is ign, fan is ecm, picks up a resistance from temp sensor and turns on relay, just run fan off toggle and turn on when engine temp gets hot. i don't think thers anything else.
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Old Jun 20, 2013 | 03:01 AM
  #4  
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: 305 to 350 Computer/ECM

Originally Posted by 827-snyWA
just run fan off toggle and turn on when engine temp gets hot.
The shade tree way

Install a $20 fan switch and have the fan run automatically
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