If you could just send Shakira in exchange please...

4 minutes ago, Wino said:

 

If you could just send Shakira in exchange please...

Haha she's just 'round the corner for you, living in Barcelona 😉

Sorry for jumping on this thread. If I am violenting the rules, please delete my post or just ignore it. 

When the acceleration pedal is pressed when the engine raises the rpm, at that exact moment the management is taken by the fuel and ignition maps. Which are "fixed" at that moment. IIRC this is "open loop" (maybe not). At that moment, no fuel correction is done by the lamda readings. So, as the duration of the injectors stay open is a "fixed" time ruled by the maps (plus a sum of standard equalizations), the fuel line pressure will affect the amount of fuel reaching the combustion chamber and thus the engine operation. Conclude that the fuel pressure regulator can affect the engine operation. Is that statement true or am I making a mistake?

 

I posted it here cause I believe it is relevant. 

Thank you for your patience! 

Edited 29 October, 20196 yr by makymak
Wrong terminology

9 minutes ago, makymak said:

Sorry for jumping on this thread. If I am violenting the rules, please delete my post or just ignore it. 

When the acceleration pedal is pressed when the engine raises the rpm, at that exact moment the management is taken by the fuel and ignition maps. Which are "fixed" at that moment. IIRC this is "closed loop" (maybe not). At that moment, no fuel correction is done by the lamda readings. So, as the duration of the injectors stay open is a "fixed" time ruled by the maps (plus a sum of standard equalizations), the fuel line pressure will affect the amount of fuel reaching the combustion chamber and thus the engine operation. Conclude that the fuel pressure regulator can affect the engine operation. Is that statement true or am I making a mistake?

 

I posted it here cause I believe it is relevant. 

Thank you for your patience! 

 

The dynamic map is what the engine uses, not the default map, the dynamic map is written and constantly modified using live values from all the sensors when the engine is in closed loop, static values are only used during a cold start but these are calculated from the current map.

I meant "open loop". I typed "closed" due to absence of mind.

 

Just fixed! 

Edited 29 October, 20196 yr by makymak

4 hours ago, makymak said:

Sorry for jumping on this thread. If I am violenting the rules, please delete my post or just ignore it. 

When the acceleration pedal is pressed when the engine raises the rpm, at that exact moment the management is taken by the fuel and ignition maps. Which are "fixed" at that moment. IIRC this is "open loop" (maybe not). At that moment, no fuel correction is done by the lamda readings. So, as the duration of the injectors stay open is a "fixed" time ruled by the maps (plus a sum of standard equalizations), the fuel line pressure will affect the amount of fuel reaching the combustion chamber and thus the engine operation. Conclude that the fuel pressure regulator can affect the engine operation. Is that statement true or am I making a mistake?

 

I posted it here cause I believe it is relevant. 

Thank you for your patience! 

This seems correct to me. Lambda sensors cannot see into the future, they can only adjust things after the situation changes. This may happen very rapidly though.

I'll go on a limb here and basically say that the judder has reduced after I serviced the EGR pipe and throttle body and adapted everything. However, I think the 3 bar regulator is mandatory if the map calls for it and I'll get it installed as soon as the next service comes up. There's also the problem of high fuel consumption and everything else has been checked and rechecked, the current 4 bar FPR being the only thing out of place. 

 

If I'm not mistaken the engine operates in open loop at idle, while warming up and at WOT? If that's the case would that explain the high consumption I referenced in another thread, as the difference between the 3 and 4 bar FPR, given the same injectors, ranges from 18% to 25% more fuel in the combustion chamber? (Would that explain a bit of oil being burned due to bore wash?) The vehicle spends quite a bit of time idling in city traffic, and quite a bit at WOT climbing mountains out of the city. They fitted the extra short HZK gearbox in Colombian cars for a reason. 

 

For reference, if it makes a difference:

 

Fuel consumption at idle, fully warmed up, A/C off: 0.7 l/h. 0.6 if lucky.

With A/C on: 1.1/1.2 l/h.

 

AVG ambient temperature: 35/38 °C.

 

I would like to compare with other cars of yours with a similar engine.

 

Will paste this in the other thread before this one turns into a fuel consumption thread, unless somebody thinks the hesitation and judder has something to do with overfueling and we can get to the very cause of it.

Edited 30 October, 20196 yr by juanse_2691
Typo

UPDATE: 3.0 Bar FPR installed. 

 

Judder is gone for all intents and purposes.

 

Plus a surprising effect: no more pinging/knocking midrange. 

 

Soft as silk now.

 

Thank you everyone, especially Pete for sending the filter free of charge. 

😊

That's an unexpectedly good result!

If I was feeling much more mentally agile this morning I'd try to work out in my head what was going on there. Maybe later...

5 hours ago, Wino said:

😊

That's an unexpectedly good result!

If I was feeling much more mentally agile this morning I'd try to work out in my head what was going on there. Maybe later...

I have a theory but I have no way of backing it up and I clearly lack the technical background. Perhaps the extra pressure in the line lead to a bit of overfueling, which the ECU responded to by altering injection duty cycles (shorter pulses) but maybe kicked in a bit too hard, leaning the mixture too much? That, together with the lower octane fuel rating would only make things worse, coming to a situation where no amount of compensation measures could arrest the pinging. Also, I use the A/C practically since I start the car until I shut it off at the end of the day, which puts an extra load on the engine, aggravating things. With the correct fuel pressure regulator the conditions fall into range (because that's the pressure the map calls for) making the compensation measures work.

 

Feel free to grab this with a big, heaping tablespoon of salt...

No, I like that idea.