5000rpm why?

[warwickstingray]

The lambda is a narrow band sensor it's purely there to tweak the mixture. It can't accurately read the air/fuel ratio.

 

[Laine_16v]

So many wrong answers in here.....

Im only replying to this as you seem quite confident in your answers, but they arent correct. Some of these are from your posts!

The 5K kick you feel is all down to fueling. Anything below 5k the engine works out fueling using manifold pressure and a complicated algorithm, this is called closed loop.
Over 5k the car switches to what is called 'open loop', this is where the fueling is done based on the first lambda sensor.

Over 5k the car is in open loop mode and the lambda sensor will have no input into the fuelling requirements of the engine. Lamba's are used for closed loop control.

Because the lambda still monitors the output in closed loop. Just doesn't have primary control
at 5K in open loop the ECU tells the MAP sensor to do one and let's the Lambda do what it wants....

Of course the lambda still monitors in closed loops control, because thats only when its used! Open loop will of course take primary readings from the MAP sensor, and NOT the lambda sensor.

 

[Dan@SJM]

Not quite.

As much as its in open loop, it does still have input from the lambda sensor, and it applied this to the long and short term fuel trims.

The kick is where the engine is given the fuelling it wants (12.5:1-13.2:1 AFR.) but below its sat at 14.1:1.

It's not a very complicated algorithm at all, simple thing is it will adjust fuelling based on oxygen in the exhaust gases, higher oxygen - more fuel, less oxygen, less fuel required.

 

[Dan@SJM]

Performance cams on any engine will give more bhp up top, but idle like a pig and not as good on low revs, there for a vvt puley is used, at what rev it opens and degrees i dont know, but i know how the system itself works... A 182 produces max torques at 5250rpm, i would think its when cams are fully advanced,...

No, they aren't. It's all down to how they are timed. If you reduce the overlap you in effect will lower the power band of the engine.

The cam is fully advanced at 1800rpm (or 800mBar MAP) and retarded back at 6500rpm.

 

[Mr Plums]

Hahahaha

 

[aucky]

I don't know why we aren't using ethanol to be honest. Oh actually yeah I do. The oil companies control the world. Funny how shell are now buying power companies. Ready for when the world goes electric. Its always been a sneaking suspicion if mine that battery technology has been purposefully held back. It wouldnt shock me if the technology exists to power a car for thousands if miles on a battery as big as a AA.

Shell successfully prototyped the hydrogen fuel cell 40-50 years ago and shelved it. I wonder why!

 

[McGherkin]

Wait until he finds out I got 314 MPG once.

Don't recommend it as a form of transport though.

 

[JoeMarano]

Cooking oil?

 

[McGherkin]

Shell V-power actually.