This is on a 2011 Camaro, can someone explain the meaning of the values and there affect on fueling by increasing or decreasing?
Will the value less than 1 (0.98, 0.97 etc.) decrease fueling or have the opposite affect.
This is on a 2011 Camaro, can someone explain the meaning of the values and there affect on fueling by increasing or decreasing?
Will the value less than 1 (0.98, 0.97 etc.) decrease fueling or have the opposite affect.
Anyone care to share inf?
that table is a multiplier, 1 meaning same value output in your injector flow rate vs pressure (which no one changes)
On my stock settings cells in the upper IAT range have values less than 1 (0.98, 0.97 etc) Would the values less than 1 effectivly lean or enrichen AFR?Quote:
Originally Posted by SultanHassanMasTuning
values less than 1 will decrease the injector flow rate, making the pulse width longer. From memeory this table tries to compensate for lower flows due to the higher fuel rail temps.
Thanks for your reply.Quote:
Originally Posted by Chris@HPTuners
Sorry for probably having you repeat your answer but I am trying to better understand the principal. Decreasing the value would lengthen the pulse width and decreases injector flow rate. I had the impression that when I decrease the value in the flow rate table that it would result in enrichen my AFR. Do I have this backwards?
If the purpose is to compensate for higher fuel rail temps should I assume you mean increase fuel supply by decreasing this value?
The idea of the table is to inform the ECM that the injector flow rate changes with temperature so the baseline fueling remains constant. Hotter fuel is less dense than cold fuel so when it's colder the actual flow rate is higher and when it's hotter it's lower. If this table didn't exist the fuel trims would need to work harder.Quote:
Originally Posted by DRTWRK
[QUOTE]Originally Posted by DRTWRK: If the purpose is to compensate for higher fuel rail temps should I assume you mean increase fuel supply by decreasing this value?
Yes as Bill stated above:Hotter fuel is less dense than cold fuel. You can see that in the ZR1 file.
Quote:
Originally Posted by Chris@HPTuners
Some confusion here, don't you mean values less than 1 will decrease flow rate by making the pulse width shorter not longer?
[QUOTE=C5 2000;322009]I see the ZR1 table seems to decrease values starting at 104* vs 140* in my file. Im I correct to assume the ZR1 will increase fuel by percentage of flow rate starting at a lower temp? If so, could this effect AFR on a OLSD tune where I do not use LTFT's. Bill mentioned that with the correct values fuel trims would not have to work so hard trying to compensate.Quote:
Originally Posted by DRTWRK: If the purpose is to compensate for higher fuel rail temps should I assume you mean increase fuel supply by decreasing this value?
Yes as Bill stated above:Hotter fuel is less dense than cold fuel. You can see that in the ZR1 file.
Numbers less than 1 are richer because longer pulse widths are commanded to make up for the lower flow rate the ecm computes the injectors at.