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91 Z28: 305 to 355 Do I need new ECM?

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Old Nov 19, 2001 | 02:30 AM
  #1  
quick91z28's Avatar
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Joined: Mar 2001
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From: La Crosse, WI USA
91 Z28: 305 to 355 Do I need new ECM?

I upgraded my TPI 305 to a rebuilt 350(355). I upgraded the knock sensor and injectors. Do I need to upgrade to the 350 ECM?
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Old Nov 19, 2001 | 07:01 AM
  #2  
RCR's Avatar
RCR
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Joined: Jul 1999
Posts: 851
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From: Shelby Twp., Mi., USA
Car: '84 Fiero ('01 GA interior)
Engine: '96 4.0 Aurora
Transmission: '96 4T80E
Nope, probably could use a new chip, though...
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Old Nov 19, 2001 | 12:01 PM
  #3  
hectorsn's Avatar
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Joined: May 2001
Posts: 502
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From: Hollywood, FL
Car: 78 Regal
Engine: 82 FBod LG4 305, 730 ECM
Transmission: M20
Axle/Gears: 4.10
It's the same ecm but a different prom, like stated before. The speed density calculation is still for a 305, among other things.
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