I intended my response in defense of the the mans mods, jokingly and admittedly spurred by my jealousy of your R-S. What a beauty.

I believe your report above and that many mods we do will actually slow the car down. I've heard about lots of guys adding open exhausts which in result lowered the back preussure to a point they were losing power.

I will say this though, I added hi flo cats and it sounded louder, but not necessarily more powerfu.Then when I dropped in some K&N filters I noticed more power than I expected. Therefore I believe the two were needed to compliment each other for an acutal gain. Kind of a more air in, more air out balance.

Enjoy your R-S, she's a beaut... Oh how I want one!

 

Reducing exhaust back pressure on a normally aspirated engine can cause loss of power related to a "scavaging" effect, but not on a forced induction engine. But reducing back pressure on a FI increases the engine's volumetric efficiency and causes more air to flow through the engine at whatever maximum boost pressure the supercharger or turbo is run at. The ECU adds the additional fuel required by the additional air flow, as measured by the air flow meters, and more power is produced. Higher flow cats will always make more power on a FI engine.

Reducing intake restriction on a normally aspirated engine will increase power, but not nearly as much on a FI engine. That's because the turbo or supercharger overcomes that restriction by sucking the air through the filters with whatever force is required to create the set boost pressure as measured in the intake manifold. K&N filters might increase power by 5 hp vs maybe 15 or more with cats.

What the driver actually feels is notoriously unreliable, and is more influenced by their perception of torque (the force with which the car feels to accelerate) as opposed to maximum horsepower (which is made close to max engine rpm) where torque is actually decreasing, but hp is still increasing).

The only real way to tell a change in power is on a dynomometer...or drag strip time slips.

Bruce

 

This is true.

My non-quantifiable data results were collected primarily through the extensive precision provided by my SOTP Dyno.

 

Just got off the phone with Chris at Mina.

The XKR-S spoiler is ready to ship @ $1200. It does have the carbon fiber top part, the clear brakelight lens with red LEDs, and internal antenna. He describes it as "essentially identical to the factory model".

I won't be able to connect the antenna on my 2007 XKR, but i currently have the fuse pulled because i hate the silly extend-o-mast it came with.

Shipping to Seattle is $50, and get THIS... they will put the factory paint for your car on it for $70! It adds about a week to ship time, but totally worth it IMO. They also have the "R-S" badge available.

Tell them you saw it on Jaguar Forums!

Cheers,
DavidM

 

Wonder If we can get a group price. dont know how that works?havent been involved in one before

 

I still prefer the Aero Kit wing for its lines but sounds like Mina really hit it out of the park with this one!

 

You can get one from Mina painted to match for $1100

 

I got mine from mina looks identital to oem and fits perfect.they have also redirected the holes to fit the original mounting so you dont have to drill new holes , excellant quality.

Also mina is in the process of producing a C/F front defuser

like the RS no price as yet untill ready, there is some talk of them producing the side sill panels in C/A as well as a complaet kit ,they already have rear defuser,

They are also in the process of producing the rear seat deleat, which I have installed which I love for al the extra luggage room .


Give chris a call for more info , Bernie

 

Bit of a revival to a very old thread but stumbled across the above images on google when considering XKR-S spoilers... As far as I can see my options are a factory pre 2012 XKRS spoiler (same as the standard XKR but bigger) or the post XKRS spoiler or the duraflex post XKRS style spoiler...

This GTR spoiler is something that I would have never considered at all and would have assumed it wouldnt fit or look right but I'm impressed by how well it integrates into the car. (although it would probably look out of place on a car without skirts etc). Kudos for your bravery and creativity! brief searches online show this spoiler in 3 pieces with the cabron fibre centre at reasonable costs.

I guess the question is how difficult was it to get it fitted and did it need much modification to get it to sit at the correct angle etc? custom brackets? how have you coped with it over the last couple years, still happy with it?

Cheers

nico

 

https://www.ebay.com/itm/2007-2015-J...torefresh=true

 

??? $5,000 ????????
Holee Ballz!

 

Ah, "First Post". Now I get it...............

 

Don't know of anyone who would bite on that!
I'll counter with my Mina Galleries version for less than $1k,,,,undamaged. lol

 

mina has them. I think $150. They are in the San Fernando Valley

 

I paid more than that for Mina's Speed Pack spoiler ($175???).... it fit so horribly even after hours of work that I returned it, even after I had (stupidly) got it painted for another $200.