Can the mph that raises the rear spoiler be changed?
Can the mph that raises the rear spoiler be changed? If possible I'd like to change it to 100 mph before it raises.
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Porsche says that the car becomes unstable and dangerous without the added down force from the spoiler over 75 MPH. So I doubt that there would be an easy way to do this.
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IIRC, it is hard coded into the ECU to deploy the spoiler at 75mph.
So, my best guess to work around this is either modifying the speedometer input to trick the ECU that 100mph was 75mph (without screwing up the speedo displays in the cluster) or modify the ECU code itself. Maybe someone else knows more and will jump in... |
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A wing will produce down-force and actually push the rear of the car down. This needs to be co-ordinated with the suspension |
why does it matter at what speed it raises? You can't see it when it's up from inside the cabin.
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I'd rather it not deploy until I hit 100 mph or even 85 mph. Was hoping maybe the Durametric could set this function. Guess I could buy one of these. http://www.ebay.com/itm/261698591779 . |
Even with the switch, once the spoiler has been automatically deployed I don't think You can override the function.
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The speedo analog signal can be tapped from the OBDII harness, and so its ground. But you knew all about Arduino did you? If not it takes a day to learn on their site (ask their million-members-forum for support if you ever need lol) |
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Porsche put it there for a reason! Why are you concerned with drag anyway? Are you trying for a high speed record? In any case, if you don't want the spoiler to deploy, you probably could get inside it and disconnect the gears and while the motor would still work and therefore no CEL, it would not move. There probably are alternate methods as some have added fixed wings and disconnected the spoiler and have no codes. Do some searching here, on boxa.net, boxster register and rennlist boxster forum |
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Why am I concerned with drag? Because this is my DD and that causes fuel economy to go down and drag isn't the only thing, I think it looks tacky when deployed for no reason. I rarely hit 85 mph, but 75 mph is easy when the highway speed is 70 mph and you need to get around another car. So here is this spoiler up for no reason and doesn't come back down until 50 mph. |
For safety reasons raising the speed at which it goes up is risky. My thought is that instead the speed at which it drops back down be changed. Instead of 50 let's say 65 or maybe even 70. I always thought the 25 gap was a bit much.
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I get around 27 mpg on the hwy doing 75-80, so I don't know what you expect. A Boxster is not an economy car and was not meant to be one Besides the spoiler at worst has a negligible effect on fuel economy The spoiler comes up at 75 for a reason. I am fairly certain that Porsche did a lot of wind tunnel testing and determined that 75 is where it is needed. The spoiler is up FOR A REASON!!! Basic aerodynamics are in play here. the shape of the car acts like an airfoil (wing). when air flows over the top of a wing, it moves faster than the air below the wing and creates a partial vacuum. this causes the wing to move towards the partial vacuum, in this case up. by disrupting that airflow over the top, it prevents the partial vacuum and therefor prevents the car from lifting. It is exactly how the wing on an airplane works and why they deploy spoilers on landing. A proper wing on the back of a car is in fact inverted and the airflow is faster on the bottom, causing down-force. In a car you need to counteract that down-force with springs (adjustable coil-overs)to push up a bit They probability have the down set at 50 so once it is up, its not constantly moving up and down |
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I was really hoping a tool like the Durametric could change the spoiler operation speeds. I have not had enough time to explore what all the Durametric can do. |
Fwiw, I picked up 1-2 mpg by going to an underdrive pulley.
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I need to change out the metal impeller water pump I installed when in a pinch last summer. So I'm going to do the UDP and Low Temp Stat at the same time. |
Hey don't mess with the 'active aero' man. That's right folks our cars were SO ahead of their time- so be proud of that sweet little, variable flap!
Kram- just think about what those huge GT2 air suckers are going to do to your aero...How about rigging up some slides that limit airflow through them above say, 50 MPH? |
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You do make a valid point on that, but the cooling benefit would be worth it, plus it looks sweeeeeeet! The rear spoiler sticking up doesn't look sweet to me, but yes it's a nice and needed feature. I believe the slots in the upper portion of that front bumper would allow the air to escape and give front down force too. So that would probably reduce mpg too, not sure at what speed that would come into play though. Like I said, this is a DD mostly, but I do take her out to some nasty fun twisties now and then. Hence the lager wheel and tire upgrade and ROW M030 suspension. The rear spoiler isn't just about mpg, I think it looks tacky when up and I only want it up when needed. Seems the dash button control would be my best option. |
Yaaa, I kinda like the function of the spoiler even if it is unattractive. It "spoils" both lift and drag in the rear which keeps the car planted at speed and also improves mileage. If it ain't broke, don't fix it. I can't even see mine while driving so it doesn't bother me at all. :)
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Seems I'm not the only person to think about this. http://rennlist.com/forums/987-981-forum/624522-anyone-ever-disable-their-rear-spoiler.html Interestingly in that thread it says the Durametric can disable the spoiler. Will have to dig into this some more, would be nice if it could change the speed settings too. Crud, just realized the person said Durametric Professional and I have the Enthusiast. Byprodriver even posted in that thread he wished his spoiler raise speed could be changed to 80. |
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