Modifying rear spoiler operation
Pro
Joined: Oct 2002
Posts: 637
Likes: 0
From: Tulsa, OK
Originally posted by johnfm
I have to agree with Phil. I have 100k miles on mine & no rear spoiler failure. If you search the archives, you won't find too many 'rear spoiler failures'.
I have to agree with Phil. I have 100k miles on mine & no rear spoiler failure. If you search the archives, you won't find too many 'rear spoiler failures'.
A major reason for not wanting the spoiler going up and down while driving about town it the noise it makes. For some reason the 993 spoiler drive is rather noisy. That on my 1990 C4 wasn't.
Chip
Burning Brakes
Joined: Nov 2002
Posts: 761
Likes: 0
From: 2 ends of the Pacific
The real reason for disabling the speed activation is to keep the wing up all the time especially in traffic and get better engine cooling....same reason why we ALL should remove the undertray.......OK Here we go!!
Addict
Rennlist Member
Rennlist Member
Joined: Feb 2002
Posts: 1,746
Likes: 3
From: West Sussex, UK
Originally posted by 914und993
What you do see a lot of is spoiler wall failures at the rubber hinge. Admittedly this is only an $80 part (from the right vendor) but also a pain in the rear.
A major reason for not wanting the spoiler going up and down while driving about town it the noise it makes. For some reason the 993 spoiler drive is rather noisy. That on my 1990 C4 wasn't.
Chip
What you do see a lot of is spoiler wall failures at the rubber hinge. Admittedly this is only an $80 part (from the right vendor) but also a pain in the rear.
A major reason for not wanting the spoiler going up and down while driving about town it the noise it makes. For some reason the 993 spoiler drive is rather noisy. That on my 1990 C4 wasn't.
Chip
Thread Starter
Drifting
Joined: Aug 2002
Posts: 2,557
Likes: 14
From: Dallas, TX
Has anyone put an o-scope on the speed signal? I've heard it's 5-10V square wave form.
Is that /w respect to chassis ground or other system ground.
Is pin 5 ground?
Also, if I inject a DC signal /w respect to the ground (Pin 5) it should work right?
---
anthony
Is that /w respect to chassis ground or other system ground.
Is pin 5 ground?
Also, if I inject a DC signal /w respect to the ground (Pin 5) it should work right?
---
anthony
Instructor
Joined: Nov 2001
Posts: 217
Likes: 1
From: Rome (Italy)
I think the 80kmh speed is too low; often reach in urban driving.
In a normal home-work-home trip, my spoiler goes up and down about 20 times. Already changed a broken spoiler wall.
In my opinion, the best remedy should be a 120 km/h speed for raising spoiler up. Until this, the spoiler is only a cooling enhancement.
To do this, I need a CMOS divider for the speed signal; but the ratio is 4/3: not so simple with standard ICs. Should I use a PLL ?
In a normal home-work-home trip, my spoiler goes up and down about 20 times. Already changed a broken spoiler wall.
In my opinion, the best remedy should be a 120 km/h speed for raising spoiler up. Until this, the spoiler is only a cooling enhancement.
To do this, I need a CMOS divider for the speed signal; but the ratio is 4/3: not so simple with standard ICs. Should I use a PLL ?
Race Car
Joined: Jun 2001
Posts: 3,706
Likes: 10
From: Virginia Beach, Va.
Heck, I don't even START my 964 in fear of wearing out the engine! 
Just kidding.
This is a FUNNY topic though, okay...let's go with either the "you like to tinker" attitude, or "you worry WAY too much" -or- the "you have WAY TOO MUCH TIME on your hands" approach.
I would just leave it alone, Porsche knows what they're doing, at least for the most part. The spoiler doesn't really perform any drastic cooling/heating or air intake at speed...not to mention literally NO downforce for the rear function - I tend to think of it as a gimmick, something "neat" to attract customers, but I may be wrong about that?
It's a "gadget" a "gimmick", whatever you wanna call it, but it works for whatever intention Porsche claims it does.
I took the silly thing OFF and added a tail that works WELL, provides more downforce and the vents/louvers are ALWAYS open...works like a champ.
Okay...as you guys on the "other side of the pond" would say - I'll grab my coat - here we go!
Just kidding.
This is a FUNNY topic though, okay...let's go with either the "you like to tinker" attitude, or "you worry WAY too much" -or- the "you have WAY TOO MUCH TIME on your hands" approach.
I would just leave it alone, Porsche knows what they're doing, at least for the most part. The spoiler doesn't really perform any drastic cooling/heating or air intake at speed...not to mention literally NO downforce for the rear function - I tend to think of it as a gimmick, something "neat" to attract customers, but I may be wrong about that?
It's a "gadget" a "gimmick", whatever you wanna call it, but it works for whatever intention Porsche claims it does.
I took the silly thing OFF and added a tail that works WELL, provides more downforce and the vents/louvers are ALWAYS open...works like a champ.
Okay...as you guys on the "other side of the pond" would say - I'll grab my coat - here we go!
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Pro
Joined: Oct 2002
Posts: 637
Likes: 0
From: Tulsa, OK
Originally posted by Jeff Curtis
I would just leave it alone, Porsche knows what they're doing, at least for the most part. The spoiler doesn't really perform any drastic cooling/heating or air intake at speed...not to mention literally NO downforce for the rear function - I tend to think of it as a gimmick, something "neat" to attract customers, but I may be wrong about that?
I would just leave it alone, Porsche knows what they're doing, at least for the most part. The spoiler doesn't really perform any drastic cooling/heating or air intake at speed...not to mention literally NO downforce for the rear function - I tend to think of it as a gimmick, something "neat" to attract customers, but I may be wrong about that?
I wouldn't be surprised if Adrian had some numbers for this spoiler function, and its no doubt somewhere in the archives.
Chip
Racer
Joined: Jun 2001
Posts: 370
Likes: 0
From: New Zealand
I'm a little confused (as normal), but on my 91 C4, when I manually activate the spoiler, stays raised unless you lower it manually or turn the car off.
Does this mean that someone has upgraded the controller to 993 model?
Ade
Does this mean that someone has upgraded the controller to 993 model?
Ade
