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Old 10-01-2008, 08:10 PM   #1
dlatourette
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Default VSS - How many pulses per wheel revolution '05 STi Manual

I've checked the archive, googled the known Suby universe, and still not found the definitive answer of how many pulses the '05 STi ecu needs per wheel revolution. Anyone have this info? I could sure use it!
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Old 10-03-2008, 09:29 AM   #2
JJ's Red Wagon
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I don't know what your trying to do, so I dont' know if this helps. I have an MY04 Sti ecu in my car and I am using a hall effect speed sensor setup at the hub for my vss. I am using 10 magnets to get the proper speed reading at the ecu. So I would assume an answer of ten pulses. Now mind you this is with a 215/45/17 tire that I am getting the right speeds + or - 1mph. I would also assume that this would not be any different for MY05 since I have never heard of any issues when people swap trannies from year to year.
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Old 10-03-2008, 01:32 PM   #3
dlatourette
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STi engine in a Porsche 914. I need to make a trigger wheel to go on the CV joint flange and need the pulse count to know how many teeth or notches to put in the trigger wheel. I've heard 5 pulses per wheel rev and now 10!

Thanks for the info!
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Old 10-03-2008, 02:34 PM   #4
Broken Motorsports
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STI in a 914! awesome setup. Lets see some pics of the project.

been contemplating picking up another 914 just to do this particular swap and keep my original 74 alone. Just passed up one at auction in CT. 74 2.0 car with appearance pkg and gauges, went for $1450 with known mechanical problems.
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Old 10-03-2008, 08:12 PM   #5
johnny p
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User member quick108 has a picture posted of the trigger wheel he made for his sti project.
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Old 10-03-2008, 08:41 PM   #6
dlatourette
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Checked it out - thanks. My concern is that he only needed the wheel speed for his speedo. I need it for the ECU so the DBW works properly. I don't really care if the pulses are correct for the speedo! It may not be an issue either way.
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Old 10-04-2008, 09:06 PM   #7
JJ's Red Wagon
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Dlatourette, I think it really is going to depend on the size tire as to how many pulses you need. I can tell you though that I did use only 5 magnets for the longest time and even though it read about the half the actual speed at the ecu it never created any driveablity issues or codes/check engine light.
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Old 10-06-2008, 02:48 AM   #8
dlatourette
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Here are a couple pics of the car. It is a customer's long(er than imagined) term project we've been working on.

http://www.davesport.com/cgi-bin/davesport/sub914.html
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Old 10-07-2008, 08:05 PM   #9
johnny p
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smallcarperformance has a Hall effect sensor kit with 5 pulse ,that will mount up to the CV's
You could just add 5 mag's if needed.
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Old 10-23-2008, 03:40 AM   #10
ciper
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What size tires will you use on the rear wheels of the Porsche?
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Old 03-30-2009, 08:20 PM   #11
icanfly
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pics anyone?
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Old 04-02-2009, 03:28 PM   #12
tbox56
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I checked at small car a while ago for my own conversion project, and their speed sensor does not mount directly to our axels... spacing is all off...I had heard that 5 pulses comes close to replicating the subaru sensor, but i wouldn't trust it for the spedometor...

Thomas
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Old 04-07-2009, 09:22 AM   #13
icanfly
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I would also like to hear more from someone that has this setup and working. Quick108 seems to be MIA? Anyway anyone up and running with this solution please post details, photos of install part numbers ect... anyone?
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Old 04-07-2009, 04:53 PM   #14
johnny p
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Some have used a screw in VDO hall effect sensor with mechanical speedo's
I know someone who has also used a vanagon speedo cable inserted into a Subaru VSS sending unit .
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Old 04-07-2009, 09:32 PM   #15
icanfly
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johnny can you get more info on that vanagon rigging? I have "cable-out" on my Porsche trans and that sounds like an interesting setup.
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