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Old 06-04-2009, 08:15 PM   #1
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WAI for Jaguar S-Type

Hi,
I've enjoyed some success with aero mods ( grille block, wheel deflectors, R mirror delete) to my car ( 2000 Jaguar S-Type, 3 liter, AT) and have been getting 28+mpg in commute driving and up to 36+mpg on long trips. As my next mod I thought I would try installing a warm air intake.
I removed the airfilter box and and removed the cold air duct from the airbox to the L wheelwell. I put a section of duct hose from the airbox to the exhaust manifold heat shield. The mod took about 25 minutes. I finally drove the car today and was curious if I would notice a change in responsiveness. I drove abour 50 miles today and didn't notice any decrease in performance. I don't have a scangauge so I don't know so far how much I have increased the temperature of the intake air. My instant MPG readout seems to indicate a slight increase in FE but I'll have to confirm this through a few refills. The modification would be very simple to reverse if it doesn't prove benefical. Time and testing will tell.
L&S
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Old 06-05-2009, 05:46 AM   #2
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Cool.

You can use a cooking thermometer with a remote probe to measure your IAT. That would be far less expensive than a ScanGauge.
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Old 06-05-2009, 05:54 AM   #3
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Quote:
Originally Posted by low&slow View Post
I put a section of duct hose from the airbox to the exhaust manifold heat shield.
Do you mean it draws air from inside the heat shield? Mine draws air across the heat shield (on the outside) and it's not getting as hot as I'd like.
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Old 06-05-2009, 06:36 AM   #4
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That is the way the factory WAI on my buick and Rusty operate. It sucks warm air from inside the heat shield.

-Jay
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Old 06-05-2009, 07:52 AM   #5
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That is the way the factory WAI on my buick and Rusty operate. It sucks warm air from inside the heat shield.

-Jay
that's different. the shield is only there to draw air across the manifold, mainly in cold weather. there's also a door in the intake tubing somewhere that will open and close based on temperature in the air cleaner housing. it's not for a WAI it's for a constant temp intake. on my truck it aims for about 105*f according to the repair book. carb and TBI and a few port FI cars all have them. leaving this intact will usually give you the best results since most engine's with this setup deal with temperature change very poorly.

you can see the vacuum actuator and outline of the door on my truck here: http://s29.photobucket.com/albums/c2...t=DSC02782.jpg
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