Aftermarket tuning solutions for Merc 555
#21
Geronimo36
Gold Member
Intersting post. Any update on the harness? I've had to make my own in the past. I'd really like to get access to tune a 555 but well... Mercury wont have it that way.
#22
Registered
Thread Starter
Harness is complete and currently in Beta right now. Factory sensors are all working and communicating with the HEFI, I have sync while cranking over on the dyno, spark in all the correct holes at the correct time. Next week we will put water and fuel to it.
#23
Registered
Thread Starter
Success!
After a week of running with all sensors reading correctly and verified by the sensors on the dyno I feel it’s reasonable to call this project successful
For those not keeping notes, the end product is completely plug and play. No need to swap a single sensor, and uses factory crank/cam sensors and coils.
The technical drawings and bill of materials are going out to a few manufacturers for bid for mass production.
For those not keeping notes, the end product is completely plug and play. No need to swap a single sensor, and uses factory crank/cam sensors and coils.
The technical drawings and bill of materials are going out to a few manufacturers for bid for mass production.
The following users liked this post:
87MirageIntruder (01-22-2024)
#26
VIP Member
VIP Member
Precision,
Would this be workable for the 496HO?
Thanks. Brad.
Would this be workable for the 496HO?
Thanks. Brad.
#27
Registered
you have to find the italian tuner that has the set up,,but its costly.I found it a while back when we were modifying 1075's.it was easier to just send out the computers to mark at precision marine.
#28
Registered
Thread Starter
Also, they share the development 555 that has live tuning ability.
Last edited by Precision; 01-21-2024 at 03:45 PM.
#29
Registered
Thread Starter
Hey, Brad.
While they both utilize the 555 the harnesses are wildly different. The 496 is closer to a LS1 than a 525.
With that being said, I could produce them as well. I just need a sample harness with notations for what each connector plugs onto.
While they both utilize the 555 the harnesses are wildly different. The 496 is closer to a LS1 than a 525.
With that being said, I could produce them as well. I just need a sample harness with notations for what each connector plugs onto.
The following users liked this post:
87MirageIntruder (01-22-2024)
#30
VIP Member
VIP Member
Fair enough. What I heard you say was something that wasn't "NO". Any potential of a solution for eliminating Merc's (albeit mandated) blockade over these ECMs is a good thing.
Anybody have a Merc 496 ECM harness collecting dust in their shop?
Thanks. Brad.