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Aftermarket tuning solutions for Merc 555

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Old 11-28-2024 | 08:49 PM
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Originally Posted by HAZRDS
I am currently planning out a build for my 496HO utilizing the PSI 8.8L shortblock with 8.8 CNC heads with Hank Slocum. I was told by Trey at River Speed and Marine that an N/A build would eventually be limited by the PCM555 due to the inability to tune for extra fuel demand. They were only able to get maybe 575hp on a max effort N/A build. However, by utilizing a whipple 3.3 kit, they are able to "trick" the PCM into supplying enough fuel for proper AFRs with forced induction....

I would rather stay N/A if possible, and it sounds like this plugNplay harness you're working on would solve the fueling issues.
I'll post some pictures later next week.
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