OM606 Turbo Selection for Truck application

X Double Dot

05-15-2020, 10:25 AM #23

(05-15-2020, 08:52 AM)jav1 No - I didn't take it as snarky at all... I didn't know the "roll eyes" thing either so ignorance is bliss?

On the table thing - that helps because in the table I referenced - "fuel request table"-, which is the main one I've played with to tune my fueling, I have values from 50-90 in my top values row which corresponds to- 100% throttle position. I'm still not 100% understanding the relationships between "ALL" the tables and it doesn't help that being rather new, I struggle to find certain things as referenced because the names used don't always match up perfectly nor are they all under the same "tab" in the software.

For example- I can't find a "rack position request table" under the tables tab... BUT- I do find a "simple rack position request f (fuelrequest)" under the rack control paramters tab... which I surmise is the table you are referring to but, not knowing all the tabs inside and out- I second guess things when the names used don't match up with the software names 100%?

In my pea brain from what I gleaned from Baldur- the "simple rack position request f (fuelrequest)" parameter defines how the fuel injection rack moves in response to fuel request values (0-100%). That parameter should have a max value of 2100 according to Baldur, as that 2100 number represents (approximately) the "full- bottomed out" rack travel value on most stock 606 pumps. But now- if that parameter establishes the relationship between rack command value and fuel request values, I don't understand why the parameter has correlations from 0.0 - 250 when my maximum fuel request value is 100??? In my tune- I set "simple rack position request f..." values at 260,740,920,1390,2100,2100,2100,2100. with the first 2100 value represented at 100 and all values above 100-250 still having the 2100 rack command value. Is that right? I think so but I'm not 100%??? Does this parameter suggest we could have fuel request value up to 250 in the fuel request table?? I'm sure Baldur has a good reason for doing this but not knowing what he knows, it causes me to question if I really understand how to fully use all of the controllers capabilities or if I'm doing it right?

yeah you've got the right table, just 0-100% throttle is the Y column, X is rpm, and the table values are a made up value that is probably a close estimation to ul fuel/stroke. I ended up using the 2d version, so instead of "simple rack position request" i've been using the "Pump Characteristic map" which is the same thing, it just allows you to scale it by engine speed. I did this because it seemed like as pump speed reduced, so did the amount of fuel i was actually getting for a given ul fuel request.

I'm not entirely sure why the simple rack position request goes to 250, but I imagine it is built in for larger element pumps, so if someone had a 250ul pump (assuming ours is 100ul) they would have up to 250ul in their fuel request tables instead of up to 100ul like us, and they could easily rescale the values in the rack position table (instead of 260,740,920,1390,2100,2100,2100,2100, they would use 260,267,407,628,996,1364,1732,2100 if their pump could actually put out up to 250ul. this is all assuming it is to keep some sort of reference between ul and rack position). So currently the way your table is setup, a value of 100ul and 250ul in the fuel request table will net the same exact pump position/fueling. It's all for scaling. Regardless though the way you have it setup sounds correct.

Interesting that he said 2100 for full rack position, i thought the stock configs had 2300 in there. regardless i'm running 1950-2000 as my max at the moment until i can get a larger/better turbo in there.

Reply

View a Printable Version

0 Vote(s) - 0 Average

Users browsing this thread:
7 Guest(s)