When and why would you use "Injector minimum on time"???

I know it's supposed to be a 'help' during mapping and set to zero milliseconds normally - but whats it used for??

 

At a guess, i would say most injectors take 1ms to open so there is no point in having an opening time lower than that. Maybe you would set it to your injector opening time??

 

not only that, but your map may only be able to have a value in each site between 0 and 255.

even at idle, you need to open the injectors a certain duration, and if you have a minimum on time set to zero and you then need the minimum amount in the map table to be, for example, 20, then you only have a resolution of 235 left to play with.

if you set the minimum on time to be the equivalent of 10, then you have 245 to play with for the rest of the sites.

make sense?

 

I'm on S8 if it helps any!!

I'm not sure about the 0-255 you're on about is that to do with the 16 x 16 mapping points then??

Basically, I noticed that the min on time was set to 1200 microseconds - but on the fuel map I thought I was getting close to that and therefore not allowing me to adjust enough for it!! Turns out it's nowhere near it on idle but on overrun it gets close.

 

good luck then

no, it's to do with using 8 bit technology - 2^8 = 256 (0 - 255)

can't help there, but i'm sure that SECS or the company that he has sold the rights to S8 to can

 

Nick,




Kev,

FYI the S8 is a 32 bit processor and has resolution to 1 microsecond in the
maps but you dont need to know that as its possible to type in the exact
time you need as you probally know. !

Minimum injector on time is the minimum time the injector is allowed to
be in under any conditionsn except during deceleration overun cut off.

It is used to program the minimum on time (all makes off injectiors have this)
which is the point when they dont flow any fuel below a certain pulse
width time and/or tehy become unstable on delivering fuel.
This is a mechanical limit iof the injector.

Generally this parameters is used on large injectors mainly.
Its used to ensure the engine gets fuel when injectors are run in that
region of fuel not being delivered at idle to prevent engine stalling.

If you dont want to use it then set it to zero to disable it !

 

Simon,

I actually really liked your ECU and the software is great to use. F keys are much better when you are bouncing around in a car than using the mouse. Soooo out of interest who is now the owner of your product?

 

Thanks Simon, it's not that I don't want to use it - it says set it to zero during normal use. You have pm's by the way!!!

 

Blimey, that puts my crappy old 8 bit L8 into perspective, lol