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Post Info TOPIC: Setting RPM Limiters on 16bit ECUs '99 - '01


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Setting RPM Limiters on 16bit ECUs '99 - '01


I've posted an updated Enginuity definition for  99-01 16 bit Busas (-24F20, -24F21, -24FD0) with improved RPM limiting capability.

See 16bit Map Thread

I had someone request a specific configuration so I went back to recheck earlier findings and discovered some new info and updated the definition to make it easier to use it.

Stock Setting

busa015.jpg

busa015.jpg
In stock configuration all three models use a two stage Fuel Cut and an Ignition Cut. The Soft Cut only partially disables the fuel. The Hard Cut turns off all the injectors. For a discussion of the differences in the 32 bit ECUs see this thread

RPM limiter thread

Without a bike to test or a bike emulator for these models I can only go by what I see in the code. I can not be a 100% certian what the soft cut does on the 16 bits. Its obvious however that the Hard Cut performs an immediate shut down of all the injectors, even if they are in mid squirt. Also I am certian the Ign cut disables the coils.

These values can be set to any value upto 12,700 but the way the software is written and the order the values are checked dictates some specific guidelines when setting these values. 

The low values must always be lower than the high values. It works as follows:

rpm > hi   limit on
lo < rpm < hi   no change, limit stays on if on, stays off if off.
rmp < lo  limit off

Obviously if you reverse these two the limit will turn on and never turn off.

The ignition limit is independent of fuel limits.

The ignition limits can be set to any value above, the same, or below either of the fuel values. (Ign Lo must still be lower than Ign Hi )

The soft cut values must always be lower than the hard cut values.

The soft cut low is the first fuel value tested. If RPM < Softlow all limiters are turned off and the testing ends. If the hard cut values are below the soft values they will never be tested.

So what do you do if your running a turbo bike or nos bike with secondary injectors and your worried about the soft cut running the bike to lean and blowing the motor?

Hard Cut only Mode

In this mode the ECU uses a different fuel limiter table that has only Hard Cut values. The normal Ignition Limits are still in effect in this mode.

Check the box to enable hard cut only mode and then set the desired value in the RPM Hard Only Limiter Settings Table.

busa016.jpg


Limits by Gear

In addition to the standard limiters there is a table of Limits by Gear position. In the '01 bike with the 186 mph speed limit this table is used to limit the top speed in 6th gear.

busa017.jpg

To remove the top speed limit one would only need to set the 6th gear soft cut numbers the same as the other gears. There is a problem however if you set the standard limits to values above the Gear Limits. The gear limits will go into effect even though the standard limits are set higher. This means you would also have to adjust all the Gear Limits values.  Or you could use....

RPM Gear Limiters Enable/Disable

busa018.jpg

The 99 and 00 (-24F20/21) ECUs have the gear limiter tables disabled by default so you don't need to worry about them in those models.

In the 01 (-24FD0) Instead of worrying about changing the Gear limiters to eliminate the 186 mph speed restriction and make them not conflict with your other limiters the easiest solution would be to disable them by clearing the checkbox.



-- Edited by RidgeRacer at 23:38, 2008-04-01

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very good write up as always...how about the 32 bit...idea

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Thanks....I should be getting around to the Busa soon. I have someone ready to do the Busa testing for me just waiting for me to get to it. Will write it out when I get it figured out and tested.

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sounds good...i set my rev limiter at 12k but since i'm running a turbo i raise the softcut above the hardcut to keep it from leaning out on the limiter, but i'm running a 32bit ecu...i'm hoping it works ok. might have to set the neutral limiter that way to see how it works using a lower setting like 4k....

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