COLD air induction

[makeitfit]

A while back we were on about KnN induction kits again and I said I'd have a go at getting some proper COLD air rammed in there
SOOO as I've recently made a mess of my bonnet I set about cutting another hole in it :lol
"Found" this up the scrappy and made a cardboard template for cutting.

Masked up the tin bit and got the angle grinder out again :sly

Trimmed the plastic scoop a bit and bonded the bugger in with Tiger Seal:thumbs

I'll rummaging in the scrap tomorrow for a boiler intake hose then I'll plum it into the airbox
Watch this space

 

[clivvy]

me like

 

[makeitfit]

I'll get some filler and paint on soon and blend it in a bit

 

[clivvy]

I want one.

ive been thinking about the standard intake, and how pretty poor it is, so be interesting to see how this turns out!

 

[jims-terrano]

I'll get some filler and paint on soon and blend it in a bit

Nah, a bit more mud and it'll be fine:lol

Jim

 

[makeitfit]

Nah, a bit more mud and it'll be fine:lol

Jim

Yeh you're probably right :thumbs

 

[makeitfit]

I want one.

ive been thinking about the standard intake, and how pretty poor it is, so be interesting to see how this turns out!

I was after a scooby one but they're bit bigger than I thought

 

[(RIP) PLANK]

you have way to much spare time young man :augie

 

[lacroupade]

But I dont see that making any difference honestly - I'd have been enlarging the intercooler scoop myself......

 

[makeitfit]

Well I did measure up the scooby intakes and they are MUCH bigger for sure, but they're in the more valued part of the scrap yard:augie
They want money for stuff in there, even if you take it off yourself :doh
I don't think it'll make much difference either but it's a bit of fun for an hour or so :thumbs

 

[R1cho]

also you've effectivly made a snorkal without actually having a snorkal as your intake is now much higher than it was

 

[makeitfit]

I've got a snorkel already
This is just for on road to get cold air in without snorkel lag :augie

 

[lacroupade]

But I dont see that making any difference honestly - I'd have been enlarging the intercooler scoop myself......

Its confession time. I've been pondering this for a while and, I know you'll find this hard to believe but I think I'm wrong. Not only that but I also think Petes i/c fan is a waste of time.

My logic is as follows (keep up, there may be questions later!)............

The ONLY air flow sensor that reads back to the ECU to adjust fuelling is waaaaay bay at the front end of the air intake system (the MAF) well before the turbo and intercooler - and AFAIK there are no sensors on the inlet manifold side of the i/c.

THEREFORE logic would dictate that, although the MAF sends data to the ECU about the temperature (effectively the density and thus the O2 content) of the air about to enter the turbo and i/c, the ECU can only make any fuelling adjustments based on (i) that actual data , plus (ii) a set of assumptions about the cooling effect of the i/c (because of course it has no sensor or incoming data to tell it whats actually happening in that leg of the system).

THEREFORE, logic also dictates that additional cooling to the i/c as a result of, say, a fan or water/alcohol spray cooling, cannot possibly result in any adjustment being made by the ECU to fuelling, since there is nothing to sense or report any such change in that part of the intake system.

Oh and by the way, said theory also bigs up Petes new letter box slot by the K&N filter cone.....in fact might be a good idea to somehow isolate the cone itself a bit from underbonnet airflow (without being too constrictive cos thats the main benefit of the K&N)and rely more on that letter box scoop or other induction technology. If that results in cooler air entering the MAF then hey-ho, result.

On my Z4 you can fit some horrendously expensive K&N-type filter called a Gruppe something or other, but it includes a load of ducting and a scoop that mounts in the front bumper for a bit of ram effect (oo-err missus!).

What do you thinkums?

 

[zippy656]

would moving teh maf to after the I/C make a change to the fueling?

as it would read the cooler air temp

 

[lacroupade]

would moving teh maf to after the I/C make a change to the fueling?

as it would read the cooler air temp

Well that would make sense, but I suspect that being so close to the inlet manifold and all the hot air from the turbo, not to mention the oil and shite coming from the EGR system, I suspect the element wouldn't last five minutes? ...which would explain why it is where it is....:nenau

 

[kbekl]

althou you cant increase the air content in the the actual ducting you can make it denser so their is more oxygen content that their would normally be in the warmer air so a air cooled inter-cooler would have less dense air so the oxygen content is lower per litre of air
Heat excites atoms and causes them to occupy more volume in space. So there for, the hotter your air is, the thinner it is. Or vice versa, the cooler it is, denser it is.

which would give a better burn in the cylinder so the fuel is used fully and should allow more power from each bore stroke

but how much more is a difficult thing to say and i doubt the gains would be that noticeable may be a little more to the gallon and a better pick up response in a petrol unsure if this will give any better gain in the t2 and alike due to the size and being as aerodynamic as a brick

 

[zippy656]

i wonder if theres a set formular for an I/C so the ECU know how much colder teh air will be after the I/C..

or what h apends if you take off the I/C and try it with out one, see IF it makes a diference.

 

[kbekl]

would moving teh maf to after the I/C make a change to the fueling?

as it would read the cooler air temp

wouldnt last long have you seen how much crap is in the inter-cooler pipes:lol

 

[kbekl]

i wonder if theres a set formular for an I/C so the ECU know how much colder teh air will be after the I/C..

or what h apends if you take off the I/C and try it with out one, see IF it makes a diference.

their is a difference just drive a pre ic and yours as they are practically the same weight and engine

 

[lacroupade]

althou you cant increase the air content in the the actual ducting you can make it denser so their is more oxygen content that their would normally be in the warmer air so a air cooled inter-cooler would have less dense air so the oxygen content is lower per litre of air
Heat excites atoms and causes them to occupy more volume in space. So there for, the hotter your air is, the thinner it is. Or vice versa, the cooler it is, denser it is.

which would give a better burn in the cylinder so the fuel is used fully and should allow more power from each bore stroke

but how much more is a difficult thing to say and i doubt the gains would be that noticeable may be a little more to the gallon and a better pick up response in a petrol unsure if this will give any better gain in the t2 and alike due to the size and being as aerodynamic as a brick

Well I guess a lot of it depends on the limitations of the ECU. The i/c alone probably compensates for the heat introduced by the turbo to some extent and the MAF is then only suggesting changes due to ambient air temperature. But even they aren't that great....I mean look at it logically; if the fuelling were infinitely adjustable as a result of MAF readings, the truck would be twice as powerful in the frost as it is in August. In reality, its a bit perkier but thats about it.

In fact Timbo is always pointing out how underfuelled the T2 is generally, so I suppose sadly, without a bit of a remap, all this is pretty theoretical.....but my main point was that introducing any additional cooling to the i/c without the ECU knowing (which it doesn't in standard form) is a waste of time.