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procharger pulley change question

Old 11-05-2012, 12:47 PM
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Default 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
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Old 11-05-2012, 06:39 PM
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What year ecu/mefi do you have?
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Old 11-05-2012, 07:53 PM
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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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Old 11-06-2012, 07:39 AM
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Originally Posted by Turbojack
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
1996 ECM and running between 4-5lbs of boost. Motor was freshened up 2 years ago.
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Old 11-06-2012, 02:39 PM
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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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Old 11-06-2012, 06:11 PM
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Originally Posted by tylogan11
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
How far did you pull to, max RPM ?
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Old 11-06-2012, 07:12 PM
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Originally Posted by tylogan11
1996 ECM and running between 4-5lbs of boost. Motor was freshened up 2 years ago.
You got some good HP for that boost. If the ecm is set up for the stock motor I think you will need to do some reprograming if you go for more boost.
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Old 11-06-2012, 07:37 PM
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are you running the stock 48# injectors at 74# of rail pressure?
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Old 11-07-2012, 08:26 AM
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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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Old 11-07-2012, 12:52 PM
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Thanks for the reply's, since I'm an hour away from Port Huron, MI I will take my boat to Tyler Crockett and let him re-program the ECM, if I decide to change the pulley.

Numbers from last dyno pull:
rpm: 5,200
HP: 709
Oil pressure: 81.7
fuel pressure: 72.9

Boat 22 Donzi
Bravo 4 Blade 32 pitch
top speed GPS: 90mph
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