ThunderMax MM EFI conversion kits
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Stage II
Joined: Aug 2010
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ThunderMax MM EFI conversion kits
I have a 99 Roadking - with SE high flow kit, SE slip ons and S&S 510 CAM. Since the cams were installed the bike is virtually unrideable once hot. All the advice is to upgrade the MAP. The PowerCommander is a cheaper option - but I'm also very interested in the ThunderMax MM EFI conversion - albeit without the auto tune. Has anybody had experience with this config. Or should I simply go for the PowerCommander at approx 2/3 of the ThunderMax price. Thanks,
Road Master
Joined: Jul 2007
Posts: 1,009
Likes: 4
Describe unrideable.
Did you have a stage 1 or 2 loaded to your ecm. If not you are too lean. Put the stock air breather box and filter back on and see if it becomes more rideable.
You can also advance the throttle position sensor to enrichen the low and mid range.
Power Commander 3 USB works well with the M/M system.
2000 RK
95" TW 21 cams
Bub 7 2 into 1
Ported and decked heads
PC 3 USB with AFR meter to allow tuning
Stock breather box with K&N filter
Did you have a stage 1 or 2 loaded to your ecm. If not you are too lean. Put the stock air breather box and filter back on and see if it becomes more rideable.
You can also advance the throttle position sensor to enrichen the low and mid range.
Power Commander 3 USB works well with the M/M system.
2000 RK
95" TW 21 cams
Bub 7 2 into 1
Ported and decked heads
PC 3 USB with AFR meter to allow tuning
Stock breather box with K&N filter
Road Master
Joined: Dec 2006
Posts: 1,058
Likes: 6
From: Omaha Nebraska
I would go with the PC III serial or USB, a huge library of maps available for MMs. The serial version can be found on such places as Ebay, much less expensive and will do the job if you have a serial ported laptop or a USB/serial converter.
Keep in mind, advancing the TPS sensor will enrichen fuel but also retard timing, good for experimenting providing you can get it set back to exactly were it was if needed.
Keep in mind, advancing the TPS sensor will enrichen fuel but also retard timing, good for experimenting providing you can get it set back to exactly were it was if needed.
Road Master
Joined: Dec 2006
Posts: 1,058
Likes: 6
From: Omaha Nebraska
The MM system uses throttle position to determine the engine's load for a given RPM. As the TPS signal (load) increases, the fuel table increases fuel and the timing table decreases spark advance. The old MM system is a full Alpha N (TPS based) engine management system, meaning that it uses a TPS position for both fuel and spark. The newer Delphi system uses TPS for fuel, but instead, a MAP sensor for spark timing. As manifold absolute pressure (load) increases, spark timing decreases at a given RPM. The Delphi is a half Alpha N and a half MAP based system. So with the MM, unlike most other systems, moving the TPS sensor changes fuel and spark.
Road Master
Joined: Jul 2007
Posts: 1,009
Likes: 4
The MM system uses throttle position to determine the engine's load for a given RPM. As the TPS signal (load) increases, the fuel table increases fuel and the timing table decreases spark advance. The old MM system is a full Alpha N (TPS based) engine management system, meaning that it uses a TPS position for both fuel and spark. The newer Delphi system uses TPS for fuel, but instead, a MAP sensor for spark timing. As manifold absolute pressure (load) increases, spark timing decreases at a given RPM. The Delphi is a half Alpha N and a half MAP based system. So with the MM, unlike most other systems, moving the TPS sensor changes fuel and spark.
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