Rail Precontrol is duty cycle map. The range is 0-100%
0 = fully open valve = no rail pressure
100 = fully closed valve = max rail pressure.

RPM freak wrote:Rail pressure precontrol map is NOT your problem.

Maybe you're right..
Infact I lowered some more the 1500bar column and 1300bar column from 3000rpm to 5000rpm.


I still get over maximum pressure at about 3100rpm :x
It's very strange because I even lowered requested pressure to 1430bar.

Mappack herehttp://www.ecuedit.com/post1382#p1382

PP2000 readings are VERY SLOW...
Is it normal?

Gone back to PP2000 + Lexia instead of DiagBox and now reading are faster :D

At this time I'm requesting 1430bar.
At normal oil temperature 115°C my engine doesn't stop and I don't exceed maximum rail pressure.
BUT when I drive like "racing" style for a few minutes, oil temp gets to 130°C :(
When it gets this high, I feel that IQ is limited, but that's ok.

The problem is that at 130° oil temp, engine stops because rail pressure exceeded maximum @ 3100rpm :shock:
There must be some correcting maps of precontrol valve..

I attach 2 videos made with oil @ 115°C.
You can see precontrol valve gets to 56% while I request a maximum of 40% in the map :?
HELP :oops:

Now I could be wrong here....

But this is a PRE-control map, so it provides the base settings for the PID loop. I.e it will set a base setting for the duty cycle of the rail pressure control valve, but if the requested pressure is not met by the base setting, then this value is modified until pressure is met. This could explain why you are requesting 40% but getting 56%...... Especially if this pre-control map is based on standard IQ and you are injecting more and requesting more RP, it is only natural that the valve will be in a more 'closed' position.

At 130 deg Oil Temp, what is the fuel temperature? (Hint... ;) )

130ºC oil
50ºC fuel

Hmm, at 50 degree fuel temp, IQ shouldnt be limited, as far as I know there are not any oil temp limiters in EDC15.

Thinking about this logically, if you have the duty cycle in the precontrol map set too high or low, and PID controller has to make a large deviation to correct, then there is likely to be issues. What are your max \ min fuel pressure deviations set too in your file? I wonder if you are exceeding this and hence the error code being flagged.

ross2482 wrote:if you have the duty cycle in the precontrol map set too high or low, and PID controller has to make a large deviation to correct, then there is likely to be issues.

I think this is the problem.. I always lowered values when I should have increased them maybe up to 54-56%..

ross2482 wrote:What are your max \ min fuel pressure deviations set too in your file?

What do you mean?

Evidently there is two more seperate tables.
One for max duty and one for min duty.

I don't know where they are...