procharger pulley change question
I currently running a 502 EFI with a M1SC, I'm considering changing the pulley from a 4.25 to 4.0. Should I plan on gettnig the ECM re-programmed? and any idea of what type of boost increase I will see?
Below are the numbers from last dyno pull: rpm: 5200 hp: 709 oil pressure: 81.7 fuel pressure: 73.9 thanks |
What year ecu/mefi do you have?
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What boost was that at? i would say you will need to change the program on the ecm. i would also check and make sure you are under the max rpm of the procharger
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Originally Posted by Turbojack
(Post 3809823)
What boost was that at? i would say you will need to change the program on the ecm. i would also check and make sure you are under the max rpm of the procharger
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I think ArticFriends asked the magic question. A 1996 is probably a MEFI 1 and I don't believe they recognize boost (no boost compensation table). So, fuel is controlled only by rpm at anything over 100kpa. A MEFI 3 would be a great upgrade for tunability.
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Originally Posted by tylogan11
(Post 3809484)
I currently running a 502 EFI with a M1SC, I'm considering changing the pulley from a 4.25 to 4.0. Should I plan on gettnig the ECM re-programmed? and any idea of what type of boost increase I will see?
Below are the numbers from last dyno pull: rpm: 5200 hp: 709 oil pressure: 81.7 fuel pressure: 73.9 thanks |
Originally Posted by tylogan11
(Post 3810021)
1996 ECM and running between 4-5lbs of boost. Motor was freshened up 2 years ago.
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are you running the stock 48# injectors at 74# of rail pressure?
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thats a lot of HP for that setup....unless this is like passtime and not being told everything...
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