Once again I have been reading up on the Cupra 160 Air Intake and there a couple of points I'm not quite sure on :confused: (not stupid questions I hope).When fitted you are giving the engine more air, or the oppertunity to take more air if required?. How does the engine know to take more air, can you "flood" the engine with to much air and will it be ok to use with the standard air filtter or do I need to get a differant one Thanks (Hope I've not gone on abit).......... Andy......OH!!!.......I've just ordered one Me car has already been superchipped

How does the engine know to take more air, can you "flood" the engine with to much air and will it be ok to use with the standard air filtter or do I need to get a differant one

Diesels take in a constant amount of air (though obviously when the turbo spools up that air is denser)...unlike a petrol engine which has a fuel-air mix, a diesel only varies the amount of fuel injected. Therefore, it's not possible to "flood" the engine, though I suppose in theory if you had dense enough air that expanded rapidly you could blow something up...would have to be going some to do that though...

The air intake and filter should just provide a less restrictive flow of air.

Rob.

Pretty sure that the amount of air going into the engine is down to the amount available (ie the amount going through the air filter). This is measured by the MAF (Mass Air Flow meter) which the ECU uses to adjust the amount of fuel to inject into the cylinder.

Just because you have a wider opening to the air filter doesn't mean you'll get more air into the engine - it depends if there are other bottlenecks in the system. Standard air filter is fine

Chris

Pretty sure that the amount of air going into the engine is down to the amount available (ie the amount going through the air filter). This is measured by the MAF (Mass Air Flow meter) which the ECU uses to adjust the amount of fuel to inject into the cylinder.

Just because you have a wider opening to the air filter doesn't mean you'll get more air into the engine - it depends if there are other bottlenecks in the system. Standard air filter is fine

Chris

if changed far more often than in the book mines done 21k now and lets just say i have no lost about 8-10 mpg and god knows how much power as it just cant breath any more :( i just cant get to buy a filter at the mo

I suppose the engine will only take in the air it needs to burn the amount of fuel injected.

If the standard intake is restrictive and doesnt allow the engine to get enough air for combustion of fuel then you will get smoke/soot. This is more of a problem when the car has been chipped etc. So basically if the car is smoking, it is overfuelled to the amount of air it can supply.

In my own experience the Cupra mod reduced smoke quite a lot on a remapped car. On a standard car the intake may reduce any smoke again.

Its obviously fitted to the ibiza Cupra for a reason i would imagine.

if changed far more often than in the book mines done 21k now and lets just say i have no lost about 8-10 mpg and god knows how much power as it just cant breath any more :( i just cant get to buy a filter at the mo

:eek: Pulleyns is 5 minutes from your house you lazy git !

I suppose the engine will only take in the air it needs to burn the amount of fuel injected.

On a petrol-engined car yes, on a diesel then no - it will take in the same volume of air regardless of how much fuel is being combusted.

Rob.

On a petrol-engined car yes' date=' on a diesel then no - it will take in the same volume of air regardless of how much fuel is being combusted.

Rob.[/quote']

True Rob unless you raise the boost pressure on the Turbo as all good tuners should

ivan yes i know but !!!!!!

by the time i get there after work they are closing for parts and im never here on a saturday really but yes 47 mpg on a run is taking the **** now

True Rob unless you raise the boost pressure on the Turbo as all good tuners should

Same volume of air still goes in...is just denser...

Rob.

On a petrol-engined car yes' date=' on a diesel then no - it will take in the same volume of air regardless of how much fuel is being combusted.

Rob.[/quote']

Maybe on a non turbo diesel im not sure, but on a turbo diesel the ECU will be telling the turbo to supply the required amount of air to burn the amount of fuel injected.

:confused:

ivan yes i know but !!!!!!

by the time i get there after work they are closing for parts and im never here on a saturday really but yes 47 mpg on a run is taking the **** now

That's what parents are for

Same volume of air still goes in...is just denser...

Rob.

Rob Rob Rob, the inlet side of the turbo acts like a vacuum cleaner it sucks air in, so if the turbo spools up faster it will suck even more air in

if air is more dense then there will be more air going in lol

if you have 1 litre of air you have 1 litre of air

if you have 1 litre and compress it by twice the pressure of normal air you will get 1 litre in the space that half a litre usually take

so then you can fit 2 litres of air in the space that 1 would usually take

Rob Rob Rob, the inlet side of the turbo acts like a vacuum cleaner it sucks air in, so if the turbo spools up faster it will suck even more air in

And the revs will also rise, hence so will the number of combustions occuring - the volume of air getting into each cylinder will be constant, because you physically can't fit any more air into a cylinder. If it's denser, the combustion will result in a more forceful expansion.

The volume of air going into the engine will be constant...it is only the fuelling which varies...

Rob.

if air is more dense then there will be more air going in lol

if you have 1 litre of air you have 1 litre of air

if you have 1 litre and compress it by twice the pressure of normal air you will get 1 litre in the space that half a litre usually take

so then you can fit 2 litres of air in the space that 1 would usually take

But you still only have one litre of air going in.

Rob.

if air is more dense then there will be more air going in lol

if you have 1 litre of air you have 1 litre of air

if you have 1 litre and compress it by twice the pressure of normal air you will get 1 litre in the space that half a litre usually take

so then you can fit 2 litres of air in the space that 1 would usually take

Yes i now see what Rob means about the actual volume of air being able to be squeezed into the cylinder, but to be able to make the air more dense by compressing it, the turbo needs to be able to deliver greater volumes of air in the first place.

what is importent is the amount of oxygen within the compressed air as this is what the fuel burns with.

And the revs will also rise' date=' hence so will the number of combustions occuring - the volume of air getting into each cylinder will be constant, because you physically can't fit any more air into a cylinder. If it's denser, the combustion will result in a more forceful expansion.

The volume of air going into the engine will be constant...it is only the fuelling which varies...

Rob.[/quote']

Rob OK I can see your point but....

At the point the turbo starts the spool the Volumetric efficiency is say 80% ,500rpm later the VE has then risen to say 150% so there is an increase in throughput through the intake pipe.

Example blow down a straw into water with you mouth not actually touching the starw, get many bubbles ?

Now put your lips to the straw and blow, now do you get many bubbles ?

To Paraphrase, the the turbo - the harder it sucks the bigger the bang

At the point the turbo starts the spool the Volumetric efficiency is say 80% ' date='500rpm later the VE has then risen to say 150% so there is an increase in throughput through the intake pipe.

[/quote']

But the volume of air going into the engine is still constant, albeit denser - hence in my original post I said that it isn't possible to "flood" a diesel with too much air, as the volume is constant, whether you've got your foot on or off the accelerator pedal.

Yes, there is more air flowing through the intake pipe, which is why the less restrictive air flow provided by a larger intake and clean filter is a good thing...

Rob.

But the volume of air going into the engine is still constant' date=' albeit denser - hence in my original post I said that it isn't possible to "flood" a diesel with too much air, as the volume is constant, whether you've got your foot on or off the accelerator pedal.

Yes, there is more air flowing through the intake pipe, which is why the less restrictive air flow provided by a larger intake and clean filter is a good thing...

Rob.[/quote']

Rob the air is not more dense coming through the pipe through , the only way that can happen is if the air is cold or the inlet of the turbo is on the start of the pipe compressing the air if that makes sense, the density of the air only changes when the air has passed the turbo.

But as to flooding a diesel you are right unless there is a fault with the engine the air/fuel ratio is controller by the MAF which will increase the fuelling based on the amount of air passing it.

Rob the air is not more dense coming through the pipe through , the only way that can happen is if the air is cold or the inlet of the turbo is on the start of the pipe compressing the air if that makes sense, the density of the air only changes when the air has passed the turbo.

Hmm...I think we're debating on the same side... :rubchin:

Rob.

Hmm...I think we're debating on the same side... :rubchin:

Rob.

Maybe we have got our wires crossed.. :P

Rob OK I can see your point but....

At the point the turbo starts the spool the Volumetric efficiency is say 80% ' date='500rpm later the VE has then risen to say 150% so there is an increase in throughput through the intake pipe.

Example blow down a straw into water with you mouth not actually touching the starw, get many bubbles ?

Now put your lips to the straw and blow, now do you get many bubbles ?

To Paraphrase, the the turbo - the harder it sucks the bigger the bang

[/quote']

Oh Dear.....Me threads got a bit out of hand Do I need to buy straight straws or the ones with the bendie bit near the top......or will just the air intake do?

Oh Dear.....Me threads got a bit out of hand Do I need to buy straight straws or the ones with the bendie bit near the top......or will just the air intake do?

Nothing is out of hand, me and rob love a good debate

No jokes about Mass Debates either you lot

BTW you want a straight straw

Oh Dear.....Me threads got a bit out of hand Do I need to buy straight straws or the ones with the bendie bit near the top......or will just the air intake do?

Depends if you can get your mouth round the air intake I guess! :eek:

Chris