Just why do you think putting holes in the airbox will increase CSA, whatever that is?

I drive my cars. I don't show them. A Jaguar XF is just a road car, not a show car. But whatever makes you happy. Not sure why you want more noise though.

 

Yes but how do you really feel?

As far as I can tell I post only correct information or my opinion, which by definition cannot be correct or incorrect. Saying I am wrong doesn't actually make it so you know.

I am neither narrow minded nor of limited understanding. I don't need a book to correct your grammar.

 

We've had more than one person with an S-Type (the XF is a variant of it) who's washed their engine then come on asking why all the codes and electrical issues, and what to do to correct them.

The same used to happen in a Ford forum I used to be on (my now-gone car).

Water and modern engines are a very bad combination but you do what you like.

 

"Just why do you think putting holes in the airbox will increase CSA, whatever that is?"

Well that statement right there proves you pass comment on things you know nothing about!!! Please for the love of god refrain, youre cimments are of no help to anyone aside from getting peoples backs up, which i presume is youre day to day job???.....you are really fecking good at it!!
CSA = Cross Sectional Area. Appologies to everyone else as i drift into engineering terminology.......my day to day job.

Adding any form of hole will increase the intake CSA - again its to attain more charger noise, under no illusion it will increase performance - as if you rrally need it with 510hp on tap anyway!!!

So please define for us what a show car is and why a Jaguar cannot be one......i'm very interested.

Why do i want more charger noise.....because i do!!! I love the charger whine and wish to make it louder......my choice.

 

CSA of what would be the question. You are mistaken if you think that the effect of the holes is to increase the CSA of the intake. You are correct that you will allow more intake hiss to escape from the carefully designed intake silencer boxes. You are mistaken in your belief that heated air is not being drawn in through those holes from the engine compartment instead of from the cooler ambient airflow as the Jaguar engineers intended.

To have any measurable effect on airflow the CSA you should begin with is the intake valve area and lift. The main restriction is the throttle (no kidding) and the diameter of the intake ducting downstream of the filter. The paper filter itself is surprisingly efficient. Putting holes in the intake boxes upstream of the filters can have absolutely no beneficial effect as a proper dynamometer test would show. Removing the intake resonator chambers likely reduced the power especially off boost.

Concours usually implies no modifications, just btw, if you want to show your car you might want to keep it factory fresh.

 

>I've never had a mechanic recommend cleaning an engine much less actually doing so.

Maybe not, but if you're detailing your car for a JCNA Concours Champion Class, the entire engine better be spotless!

They check under the hood and I lost a bunch of points last year for simply forgetting to remove the rag I tuck up front for checking my oil level.

But don't ask me about removing my rear headrests and forgetting to put them back in, when they checked the interior. And the contents of the trunk well it better be exactly as it was when the car rolled out of the factory door...

Saw a beautifully restored Jaguar Mark 2 lose first place last week because the screws holding the little lights on top of the fenders (the ones that blink with the turn signal) were wrong. They were attached with phillips screws rather than the correct slotted (flat blade) screws.

=================================
My karma just ran over your dogma
Current: '08 Jaguar S-Type 4.2 "Satin Edition" (250.06 hp / 259.67 torque)
Past: '05 X-Type 3.0/auto Jaguar Racing Green

 

Not again............

 

Jagular............what is your background??? I'm confused as you have no idea what CSA is yet u offer your insite into some engineering basics......all be it incorrect, unless of course you can back up each one of your daft statements with some evidential proof. In which case as an engineer its meaningless to me and holds as much water as my bloody airbox......the ones with holes in.

 

Hey moderator! This thread was about the necessity of the engine cover and has lost its identity. Time to shut it down!

Play nice boys!

 

Come on.......man up!!!

Why shut the thread down, nothing wrong with a tactical steer off topic.

As some people on this forum appear to be experts on air flow and the disadvantages of messing with what Jaguars finest have produced, i'm sure like many that you must be curious as to there credentials..........or maybe not.

 

I don't see any need to shut it down IF it is possible to continue the discussion in a civil manner.
If it's not then it may be necessary to close it and hand out infractions to those who find it impossible to continue the discussion without resorting to personal attacks.
We'll see.
FWIW I don't see how cutting holes in the airbox increase CSA of the inlet tract, or maybe we are just talking about CSA of the airbox inlet?

 

Agreed,

Please read my post though.......Jagular presumed it was the inlet tract, when did i say this? I did not, i said it increases the inlet to the air-filter.......which it does, obviously.

I see absolutely no detriment to doing this from a performance view as it on the cold side of the engine, heat rises!! And its the bottom of the air box, above the bumper/wheel arch. More CSA to the filter = more chance for the filter to breath.

To keep induction noise down the size of the inlet can be reduced, it may have been reduced to such an extent thay it actually choking the engine, again you cannot have a situation where the opening to the filter is too large, as my engine is supercharged it does not need RAM air and sucks in as much air as it needs...........us engineers have to make compromises for rules, regs, costs, longevity, safety margins........do not presume everything is optimised, my 20 years in the automotive engineering world tells me it 100% does not!!
..............

maybe we need a new thread on air intakes!!!

 

Thanks for the feedback..no really..


I can't imagine in every case washing the engine a little will yield positive results besides a clean engine..Perhaps there were weak or leaking connections or too much high pressure water in the vulnerable spots I mentioned...feces accurs..




Just got back from my dealer..Had my XF in for it's annual oil change.To make a long story short and I will expand on the service in another thread,...But after the tech replaced my water pump today (I watched the whole procedure)...My tech I've known and have become friends with since 2003..He backed the car out of his stall and then shut the engine off, and guess what?...Yup, he got out the old garden hose and washed down the engine to flush away any left over coolant residue left behind from the R/R of the water pump..Then he got out his air hose and blew out/off all the water..Huh! You can imagine my surprise.. So casually I asked him his concerns about washing the engine..He said, and I quote: 'nothing wrong with that, most of the connectors are waterproof and just letting it air dry or blowing off the excess water is all you have to do'....He did add, to be careful around the coil packs, since there is high voltage there and could short out if they're still wet....I'll be damned, who would of thunk?

 

Your mechanic is obvisouly an idiot and should have left what ever excess coolant in the engine bay to eat away what ever it was touching. You did not benefit anything from him doing such a risky and useless procedure, now go drill some holes in your air box and throw a bag of dirt on your engine.

 

LOL..thanks

 

I think you'll find that the maximum air pressure you can provide upstream of the air filter is ambient atmospheric and that punching holes in the airbox cannot increase the pressure inside the airbox. CSA of the total holes in the airbox has no effect on this. This assumes a stationary vehicle.

I think you'll find that the design used by Jaguar produces some ram effect into the airbox intakes which you will have destroyed by punching holes in the bottom (or anywhere) in the airbox. The ram effect will occur when the car is moving forwards and will increase with speed.

I think you'll find that high school physics (which I achieved) is sufficient to understand how this works and that an engineering degree is not necessary for this. Whether that is so or not I can confidently explain the physics of this simple phenomenon (related to using a straw to drink from) should you require it.

In Canada CSA is the acronym used by the Canadian Standards Association. Many other terms are abbreviated using the acronym CSA. It is, to say the least, somewhat pedantic to refer to holes you chopped into the factory airboxes by reference to "CSA" especially when same has no bearing on what you've actually achieved. I.e. nothing. Assuming your objective was to increase airflow and assuming this required the removal of the airbox structure as a restriction why not take the top (or bottom as the case may be) right off? Why stop at 36 mm holes? Why not 43 mm holes?

 

Mr assumption, you assume.......again......that the jaguar emgineers needed a ram effect.....what on gods sweet earth are you basing this on?? Asside from you high school physics guess work??

My engine is supercharged......it does not require ram air......it has a massive great big supercharger that sucks air......ramming air into it has no benefit........it draws in as much air as it needs by nature if its design.

 

In Canada CSA is the acronym used by the Canadian Standards Association. Many other terms are abbreviated using the acronym CSA. It is, to say the least, somewhat pedantic to refer to holes you chopped into the factory airboxes by reference to "CSA" especially when same has no bearing on what you've actually achieved. I.e. nothing. Assuming your objective was to increase airflow and assuming this required the removal of the airbox structure as a restriction why not take the top (or bottom as the case may be) right off? Why stop at 36 mm holes? Why not 43 mm holes?[/QUOTE]

Ha ha.....yes, because obviously i was reffering to a Canadian standard when reffering to holes and increasing intake size!!

If u read what i wrote earlier then you'll note that my objective was to increase charger whine......which i achieved nicely thanks.....

 

I wondered if it was supercharged or not yesterday, it might be a good idea to give that information in your signature.

 

Good catch Norri,

i'm on my phone or tab most of the time and in this state the sig does not show..........now sorted!!!

In terms of Ram air though it really makes zero difference on our cars at legal speeds, there is no scoop on the XFR in direct line of airflow and even if there was you may see 1 PSI of pressure at 100mph if you are lucky in the airbox of the XFR, yes this may aid the effort put in by the charger but without testing it who knows by how much..........