XKR Airfilter
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Hello, do not bother to remove the original air filter box from your car.
The original air cleaner filter is designed to bring the cleanest, coolest air to your engine.
I know the other seems good and they say it raises horsepower, but the point is to bring cool clean air to your engine .
Think about it, if you use a straight cone type filter, it is bringing in the hot air from the engine compartment to your throttle body, that is the worst scenario you can get.
Where does the engine get cool air? Hot air is detrimental to MPG, Horsepower and general engine well being.
Just my thoughts and experience. Cool clean air is the absolute best thing to your engine, that could happen.
Not clean hot air from,
A NEW CONE STYLE AIR FILTER THAT DRAWS AIR FROM THE ENGINE COMPARTMENT THAT IS HEATED FROM THE ENGINE!! iT MIGHT LOOK NICE, BUT IS NOT RIGHT FOR YOUR ENGINE.
For what it's worth,
HAPPY MOTORING...
The original air cleaner filter is designed to bring the cleanest, coolest air to your engine.
I know the other seems good and they say it raises horsepower, but the point is to bring cool clean air to your engine .
Think about it, if you use a straight cone type filter, it is bringing in the hot air from the engine compartment to your throttle body, that is the worst scenario you can get.
Where does the engine get cool air? Hot air is detrimental to MPG, Horsepower and general engine well being.
Just my thoughts and experience. Cool clean air is the absolute best thing to your engine, that could happen.
Not clean hot air from,
A NEW CONE STYLE AIR FILTER THAT DRAWS AIR FROM THE ENGINE COMPARTMENT THAT IS HEATED FROM THE ENGINE!! iT MIGHT LOOK NICE, BUT IS NOT RIGHT FOR YOUR ENGINE.
For what it's worth,
HAPPY MOTORING...
The following 2 users liked this post by vettegood:
Mendo XK (09-09-2012),
User 070620 (04-01-2015)
#3
The following users liked this post:
Mendo XK (09-09-2012)
The following users liked this post:
Mendo XK (09-09-2012)
#6
No cone filter!
I got rid of my cone filter that the car had put on by a previous owner. I put a factory air box back into the Jag with a K&N panel filter inside and improved the power (no hot air coming in)... then I took it a step further. Consider doing THIS: https://www.jaguarforums.com/forum/x...r-boxes-76906/
The following users liked this post:
Mendo XK (09-09-2012)
#7
Messing with the air filter is not going to give you any usable power increase. If you want power in an old high performance car, give it a real tune up as most cars this age are down on power at least 20% due to worn sensors and management parts. Change all plugs and filters, switch to synthetic lubes everywhere, get the injectors cleaned and matched, change the MAF and O2 sensors . You will get way more power than with exhausts and air filters and the car will last longer and run better.
The following users liked this post:
Mendo XK (09-09-2012)
Trending Topics
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Mendo,
Consider this: With the supercharger, your engine's not "inhaling" air like a normal engine. It's being RAMMED into the engine, so adding a free-flow component isn't going to effect the supercharger's ability to do this by much. As for "cooler" air - the others are right: you'd be inhaling engine compartment air vs. the cooler air from the OEM set-up. And also consider that we use "radiator" coolant (already mighty hot) for our heat exchangers, so how much difference could a a few degrees of ambient possibly make?
CORRECTION: After I wrote that inter-cooler piece (which always did seem questionable) I checked out the system in detail and realized I was wrong (quite embarrassingly too!). PLEASE DISREGARD. (oops)
This is the most complicated and advanced engine I've ever work with (out of maybe 10 others I've modified). I can't see too many justifications to wonder very far from spec unless your talking about increasing boost to go with the new exhaust.
Hmmm,... Being as I already have the free flow exhaust - - Now THAT's an interesting idea!
We're ALL masochists, you know - right?!
Consider this: With the supercharger, your engine's not "inhaling" air like a normal engine. It's being RAMMED into the engine, so adding a free-flow component isn't going to effect the supercharger's ability to do this by much. As for "cooler" air - the others are right: you'd be inhaling engine compartment air vs. the cooler air from the OEM set-up. And also consider that we use "radiator" coolant (already mighty hot) for our heat exchangers, so how much difference could a a few degrees of ambient possibly make?
CORRECTION: After I wrote that inter-cooler piece (which always did seem questionable) I checked out the system in detail and realized I was wrong (quite embarrassingly too!). PLEASE DISREGARD. (oops)
This is the most complicated and advanced engine I've ever work with (out of maybe 10 others I've modified). I can't see too many justifications to wonder very far from spec unless your talking about increasing boost to go with the new exhaust.
Hmmm,... Being as I already have the free flow exhaust - - Now THAT's an interesting idea!
We're ALL masochists, you know - right?!
Last edited by scardini1; 09-09-2012 at 07:35 PM. Reason: Mistaken System Understanding
The following users liked this post:
Mendo XK (09-09-2012)
#10
Just to add my 2 cents worth, I also had the K&N cone filter in and really felt a loss of power. It also increased supercharger sound to the cabin that I really disliked. I prefer the growl I get from my MagnaFlow exhaust system. I agree, the cooler air from the front fender is the better option. K&N Kit for sale... !
#11
K&N is complete rubbish, great way of ruining a high tolerance engine.
Manufacturers desperate for every ounce of HP are not stupid, they can make their filters with cotton- the reason they dont is because engine longevity is more important to them, and it should be to you too.
K&N is great for hillbilly motoring, where the engine is rebuilt more often then new tires purchased.
Here is empirical data that will make you throw them out immediately. K&N Air Filter Review - Debunking the Myths (and why OEM is better)
Manufacturers desperate for every ounce of HP are not stupid, they can make their filters with cotton- the reason they dont is because engine longevity is more important to them, and it should be to you too.
K&N is great for hillbilly motoring, where the engine is rebuilt more often then new tires purchased.
Here is empirical data that will make you throw them out immediately. K&N Air Filter Review - Debunking the Myths (and why OEM is better)
The following users liked this post:
Johnken (03-27-2015)
#12
K&N is complete rubbish, great way of ruining a high tolerance engine.
Manufacturers desperate for every ounce of HP are not stupid, they can make their filters with cotton- the reason they dont is because engine longevity is more important to them, and it should be to you too.
K&N is great for hillbilly motoring, where the engine is rebuilt more often then new tires purchased.
Here is empirical data that will make you throw them out immediately. K&N Air Filter Review - Debunking the Myths (and why OEM is better)
Manufacturers desperate for every ounce of HP are not stupid, they can make their filters with cotton- the reason they dont is because engine longevity is more important to them, and it should be to you too.
K&N is great for hillbilly motoring, where the engine is rebuilt more often then new tires purchased.
Here is empirical data that will make you throw them out immediately. K&N Air Filter Review - Debunking the Myths (and why OEM is better)
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+1 (On Gus comments of course)
My engines where still perfect after 120K, using only K&N filters and have driven them hard with lots of extra performance as well.
The test shows for one that you may need to clean you filter more often, especially when performance is the objective.
The stock paper filter is already in-adequate for the XKR (maybe ok for the XK8 as that one needs less air), and with a K&N panel filter you can already gain more power, especially once you start there to increase the airflow more by pulleys etc.
Here the test also clearly shows that you can at least gain 1” of vacuum (to amazingly much more for some paper filters, like the acdelco!), and I have seen about 1 to 1.5” difference in favour of the K&N panel filter compared to the stock one. Once tuning the difference only becomes larger, and thus you are losing more power.
My engines where still perfect after 120K, using only K&N filters and have driven them hard with lots of extra performance as well.
The test shows for one that you may need to clean you filter more often, especially when performance is the objective.
The stock paper filter is already in-adequate for the XKR (maybe ok for the XK8 as that one needs less air), and with a K&N panel filter you can already gain more power, especially once you start there to increase the airflow more by pulleys etc.
Here the test also clearly shows that you can at least gain 1” of vacuum (to amazingly much more for some paper filters, like the acdelco!), and I have seen about 1 to 1.5” difference in favour of the K&N panel filter compared to the stock one. Once tuning the difference only becomes larger, and thus you are losing more power.
Last edited by avos; 03-28-2015 at 01:25 AM.
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The power difference becomes bigger the more air you are sucking in (so if you play with pulleys or iirc like you are making a TS setup).
I even think the power difference for a stock XKR engine could already be more than 5hp, somewhere between 5 and 10 I would think. Cheapest hp per $ you can get here.
As the filter (and intake) setup isn’t properly designed for performance even for a stock engine, the limitations only become bigger when you tune the engine. It is not just lost air that is holding power down, the vacuum is also consuming power from the supercharger to run, this all adds up. You need proper sizing of the filter to keep the vacuum as small as possible that is key here.
I have made my intake now such that with the airflow I have (>50% over stock), the intake vacuum is only 20-25 mbar at wot. Of course this is with a very large K&N cone filter. Oversized so I don't have to clean it that often as well ;-).
Am not aware of any issues with the K&N panel filter, and I have used it for some time (guess about 80Kmiles or so).
Where it could go wrong is when people start to play with cone filters and the MAF itself (ie some Mina filter setups for example), this is something you have to be careful with, as altering the flow of the air past the MAF has an effect on its readings.