SOI Adjustment (warning... hardcore maths)

by **ecuedit** » Fri Aug 31, 2012 7:25 pm

That is not so easy.

When you flash your ECU,
ECU needs some time to take new calculations and to "learn" new parameters to work optimal.

I have personally flashed one single ecu for over than 200 times and I know how it goes :lol:

by **mexanico1971** » Thu Sep 20, 2012 4:32 am

ecuedit wrote:That is not so easy.

When you flash your ECU,
ECU needs some time to take new calculations and to "learn" new parameters to work optimal.

I have personally flashed one single ecu for over than 200 times and I know how it goes :lol:

that is true !
I have not est myself !

I always say to my costumers to came back one week later to diagnose the car , and a week after wend I call, they sometimes say !
the car is running even better from the day we remapped .

BR

by **ecuedit** » Thu Sep 20, 2012 12:06 pm

;) very true.

by **rlees85** » Sun Sep 30, 2012 6:44 pm

Can I just confirm something... I know this is stupid but I need to be 100% sure...

The values in this map are 'Start of Injection' in 'Degrees BEFORE top dead centre'.

SO, increasing values retards timing, decreasing values advances.

Is this right?

by **ross2482** » Mon Oct 01, 2012 10:31 am

I would have thought the other way around!!

Think about it logocally. As you increase the value, it is more degrees before TDC, hence you are advancing the timing. ;)

by **rlees85** » Mon Oct 01, 2012 11:23 am

Yeah I think your right... I was thinking 'Advance' as furthur forward and 'Retard' as furthur backwards (in time).

But if you get things in 'Advance' you get them quicker, not later...

by **ross2482** » Mon Oct 01, 2012 11:28 am

Thats it - You've got it :-)

by **orienz** » Wed Jul 10, 2013 1:34 pm

This is actually very simple math as far as I can see.

But what is benefit of doing this? Raising rail pressure and still have stock-like injections? As far as I can see you adjusted IQ back to stock based on raised common rail pressure, correct? So if we do this, you will end up with stock-like fuel quantities except that injection time will be shorter because of raised pressure, which leaves room to adjust Start Of Injection some more. Tell me if I am wrong!

I am new to this so just trying to see the point in all this :-)

Very informative thread, loving it.