IJPU and motorcycle engines

[alanblackhurst]

I am running a GSXR 600cc K7 Suzuki engine in a sidecar outfit using standard throtle bodies and an M800. When looking at the fuel setup I found that the IJPU is set at 9 ms. The help in the setup, says that the pulse width should be set between 15 and 20 ms for normally asp engines. Is this value for large capacity engines, if it is how is the correct value calculated or is it a best guess.

[IDP]

IJPU should be a value that gives a max main fuel table figure of around 100.

As an example we use IJPU 7 on 09 R6 engines.

From the help text.
"If the maximum value in the Fuel Table falls below 60 then the IJPU setup
parameter should be decreased to increase the Table numbers. This ensures
that the Fuel Table has sufficiently fine resolution."

[Martin]

you can have it up to 400 on the hundred series ECUs
Only the M4 M48 had the 99.9 roof.


I mostly use 10.
10ms IJPU will be 10ms fuel at a table value of 100 (plus minus trims) with an IJPU of 10 you will be able to go up to 40ms fuel in the main fuel table...engine must just turn slow enough for it to be possible.
A smaller IJPU will give you smaller adjust steps, if you need smaller steps and a smaller range of the main fuel table. IJPU is the measured unit of fuel of which the table specifies the percentage of that measurement. So IJPU of 10ms with a table value of 50 will give 50% of 10ms. if you have 7ms for IJPU and a table value of 50, it will translate into 3,5ms of fuel. So, whatever pleases you...as long as you stay below 400 and your resolution is good. Only the 100series ECUs have the 400 roof