Spoiler support
#4
02-08-2016, 01:13 AM
Veteran Member
FYI, It fixes to the cross member under the rad (by those indented holes halfway towards the back edge as well as to the spoiler leading bottom edge, and also to the bottom of the wheelarch baffles in front of the front wheels. Do all this and together with the spoiler it will make quite a rigid structure and last a long time.
Greg
Greg
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BC XJS (02-08-2016)
#5
02-08-2016, 09:42 AM
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I found that water stayed on the tray and was rusting the cross member so after derusting and painting it, l put a small SS washer between it and the tray to let the water run out. I also made the two angle brackets on the sides out of SS and used plastic nut and bolts (UK number plate bolts) to fix them.
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BC XJS (02-08-2016)
#6
02-08-2016, 11:31 AM
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i like the no spoiler look,, have been up to 130MPH with no lift, i agree it could get light if you went faster(i rarely do).
i like the stance from the front view, shows the lower fender angles and wide tires, (Agressive look).
BUT to each his own.
i like the stance from the front view, shows the lower fender angles and wide tires, (Agressive look).
BUT to each his own.
Last edited by ronbros; 02-08-2016 at 05:12 PM.
#7
02-08-2016, 11:42 AM
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greg
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BC XJS (02-08-2016)
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#8
02-08-2016, 11:43 AM
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I found that water stayed on the tray and was rusting the cross member so after derusting and painting it, l put a small SS washer between it and the tray to let the water run out. I also made the two angle brackets on the sides out of SS and used plastic nut and bolts (UK number plate bolts) to fix them.
Great idea for the cross member. I did just what you did for the wheelarch fixing. Works a treat doesn't it?
greg
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BC XJS (02-08-2016)
#9
02-08-2016, 01:28 PM
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IIRC, the spoiler wasn't just for downforce, but also directing air for cooling purposes.
I believe a car without a spoiler will run hotter.
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BC XJS (02-08-2016)
#10
02-08-2016, 05:10 PM
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had it that way for 22yrs , in Florida heat and now in Texas heat ,ambient sometimes into the 100F, no overheat probs! i use a permanent digital readout temp gage,along with the factory gage.
altho i had a Mazda RX7 and if you run without the front under car shields it would overheat, something about air flow stagnating and slowing outflow of air behind the radiator!
if i ever need a front spoiler i would make one far more effective than the factory rubber one!
#11
02-08-2016, 08:18 PM
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FRONT SPOILER: It’s important to have the front spoiler in place. Engine cooling relies on air coming in through the radiator, and it must have a place to go. The XJ-S does not have vents through the hood or out the sides, so all this air must go out the bottom. The front spoiler is designed to direct air either into the radiator or around the sides of the car, and to restrict air from going under the nose of the car as much as possible. This results in low pressure under the car, so the air going through the engine compartment can easily flow out that way.
However, if the spoiler is missing, air can flow right under the nose of the car unimpeded. This increases the pressure under the front of the car, which in turn resists the outflow from the engine compartment. <b>The air coming in through the radiator cannot escape as easily, and builds up pressure in the engine compartment. The resulting backpressure prevents as much air flowing through the radiator. </b>It also tends to cause significant lift on the front end (try multiplying a very small pressure over the entire area of the front half of the car; the total lift can be very large indeed) and can cause the car to “wander” at high speed.
However, if the spoiler is missing, air can flow right under the nose of the car unimpeded. This increases the pressure under the front of the car, which in turn resists the outflow from the engine compartment. <b>The air coming in through the radiator cannot escape as easily, and builds up pressure in the engine compartment. The resulting backpressure prevents as much air flowing through the radiator. </b>It also tends to cause significant lift on the front end (try multiplying a very small pressure over the entire area of the front half of the car; the total lift can be very large indeed) and can cause the car to “wander” at high speed.
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BC XJS (02-09-2016)
#12
02-09-2016, 11:33 AM
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that paragraph by him is standard front spoiler knowledge, but primarly for RACE cars.
how many cars do not have spoilers and rarely lift to a dangerous level.
for your interest; i had a 1982 Camaro with a 7.6L BBC it would run up into the 160s-170smph on the secluded hi-ways!
at speed around 145 it would start to wander at the front, BUTTTT, if you had the nuts to hold the pedal down it would pass thru speed/torque range and the nose would hunker down and run to 174mph!
mainly because torque would have the nose UP, when let off nose would drop because torque was falling off!
and yes it could have used a spoiler, but not as much fun!
also what works for someone may never work for another!
Last edited by ronbros; 02-09-2016 at 11:36 AM.
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