Intercooler

[Deleted account DD]

Heres one for you.....................

Cant make my mind up :nenau

I think its fair to say we all agree fairly well that that an intercooler needs to be errrr...................cooled.

Well moving on the thought process, which will use the most fuel ?????

A fuel / air mix thats well cooled from an efficient intercooler

or

A fuel / air mix where the intercooler hasnt been doing its job very well :nenau

and WHY ?


Im stuck :nenau:nenau

 

[(RIP) PLANK]

my opinion,

an efficient inter cooler will be better for MPG - as it should produce more power so less revs required.

now I'll wait to be proved wrong :augie

 

[lacroupade]

The latter I assume. Logic as follows:

The MAF senses a given air temperature and, on the assumption that the intercooler is going to do its job, tells the ECU to inject a given amount of fuel for the amount of oxygen it knows should be ingested at that air temperature and density.

But, if the intercooler doesn't do its job, then the air entering the cylinders will be hotter and therefore less dense and therefore have less oxygen, so the engine will effectively be running rich and use more fuel than it needs to.

Make sense?

 

[makeitfit]

Can I pass on this 'cause the wine has been messin' with my mind :augie

 

[solarman216]

The latter I assume. Logic as follows:

The MAF senses a given air temperature and, on the assumption that the intercooler is going to do its job, tells the ECU to inject a given amount of fuel for the amount of oxygen it knows should be ingested at that air temperature and density.

But, if the intercooler doesn't do its job, then the air entering the cylinders will be hotter and therefore less dense and therefore have less oxygen, so the engine will effectively be running rich and use more fuel than it needs to.

Make sense?

But is not the MAF on the outlet of the intercooler if so it will give a correct reading, I do not have a diesel so cannot check, Rick

 

[lacroupade]

But is not the MAF on the outlet of the intercooler if so it will give a correct reading, I do not have a diesel so cannot check, Rick

No its on the air inlet immediately after the air filter and before the turbo and i/c.

 

[solarman216]

No its on the air inlet immediately after the air filter and before the turbo and i/c.

Then yes I agree with you, and it is a silly place to put the MAF, Rick

 

[lacroupade]

Then yes I agree with you, and it is a silly place to put the MAF, Rick

Well I'd agree with that summary but there must be some logic to it, I just wonder what???

 

[briggie]

Well I'd agree with that summary but there must be some logic to it, I just wonder what???

spose they gotta put it somewhere :augie

 

[lacroupade]

maybe by the time its gone through a red hot turbo the air would melt the wire after a while? who knows. Must be designed by a woman....:augie

 

[makeitfit]

Well I'd agree with that summary but there must be some logic to it, I just wonder what???

Lazy developers, the temp range of existing MAF perhaps suits it pre I/C:nenau

 

[briggie]

of course it couldnt be the excuse its cheaper to make it so it fits there surely ? :augie

 

[Thomas-the-Terrano2]

but the charge air will only be cooled if theres a decent ram air effect thru the
i/c rad, ie when vehicle is moving.

all of this pipework on a troll or r20 is on top of a hot engine so being warmed
whilst trying to be cooled?

the charge air also travels further being cooled though presume as is a sealed
system the pressure doesnt drop.

how much of a fan is then needed to replace ram air at slow vehicle speeds
and much much power does this take from the engine that its trying to enhance.

 

[felixthelogchopper]

of course it couldnt be the excuse its cheaper to make it so it fits there surely ? :augie

Oooh, you old cynic, you! :lol

 

[lacroupade]

but the charge air will only be cooled if theres a decent ram air effect thru the
i/c rad, ie when vehicle is moving.

all of this pipework on a troll or r20 is on top of a hot engine so being warmed
whilst trying to be cooled?

the charge air also travels further being cooled though presume as is a sealed
system the pressure doesnt drop.

how much of a fan is then needed to replace ram air at slow vehicle speeds
and much much power does this take from the engine that its trying to enhance.

I think the problem is that, because of aerodynamics, it soon reaches a point at speed where the fan becomes as much of a hindrance as a help.

Can't think of many production cars with OEM i/c fans fitted, in fact the diesel Smart is the only one I'm aware of...and thats all packed in a shoebox so understandable.:nenau

 

[makeitfit]

The fan is only a benefit at low speeds to help prevent heat soak.
as soon as any sort of speed is avail say over 20mph , then there's loads of air through the engine bay up and down through the I/C. As you say Paul your KnN induction works fine.
The fan I have on mine is designed to run either way , so as speed increases then the fan will be turned by in coming air, so no restriction to speak of.

 

[zippy656]

so maybe help cool the intercooler a little more

http://www.nissan4x4ownersclub.com/downloads/workshop/wk35.pdf

 

[Adz]

Heres one for you.....................

Cant make my mind up :nenau

I think its fair to say we all agree fairly well that that an intercooler needs to be errrr...................cooled.

Well moving on the thought process, which will use the most fuel ?????

A fuel / air mix thats well cooled from an efficient intercooler

or

A fuel / air mix where the intercooler hasnt been doing its job very well :nenau

and WHY ?


Im stuck :nenau:nenau

Well late on this 1 :doh

Is this a general question or vehicle pacific

 

[jace]

airs already past flow meter so unless electro trickery can tell how cold air comming outve charge cooler how will it now to boost fueling?

 

[Deleted account DD]

Well late on this 1 :doh

Is this a general question or vehicle pacific

general not specific but applicable to any you wish really.