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Old 09-26-2000, 05:00 AM   #1
Nigel
Scooby Newbie
 
Member#: 1919
Join Date: Jul 2000
Location: Markham, Ontario, Canada
Vehicle:
1994 Legacy Turbo
Silver

Post spedo accurace getting worse

When I bought my '94 Legacy Turbo in June of this year, it had been driven very little during the previous few months. I noted that at 120Kph (approx. 75mph), the engine was turning at 3000 rpm in fifth. This really only caught my attention because this was identical to my previous car, an '88 Acura Legend. After a couple of months, I noticed that the speed at that rpm seemed to be creeping up towards 125kph. But I thought maybe I was just remembering things wrong from when I first started driving the car.

Then, I broke my foot, and I didn't drive the car for 5 weeks. When I started driving again, I noticed that once again the engine was running at 3000rpm at 120. Now, a few weeks later, it has crept up past 125 to about 127.

I know that speedometers are generally inacurate, and in mph it only works out to a few mph (looks big in kph though!), but it still bugs me. Also, sometimes the spedometer needle will start to vibrate slightly (not related to road condition), and if cruise control is on, the car will accelerate and decelerate abruptly. So, I'm thinking that the speedo cable may be binding, and I was wondering if anyone else has had this problem or has suggestions?

Nigel
Ontario, Canada

I just noticed my wonderful job spelling "accuracy". It's spelled with a 'y' not an 'e'! But we can't edit the title of a message! Of course, there are probably about a dozen other mistakes in the body of this message, so I don't know why I'm focusing on this one word. Argh! I see I spelt 'speedo' wrong too. I guess I shouldn't try writing these messages at 7 in the morning.


[This message has been edited by Nigel (edited September 26, 2000).]

[This message has been edited by Nigel (edited September 26, 2000).]
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Old 09-26-2000, 10:36 AM   #2
DLC
out back
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Member#: 1964
Join Date: Jul 2000
Chapter/Region: RMIC
Location: 84XXX
Vehicle:
01 BH
Blue/Bronze

Post

I had a similar problem on my 90L but never got around to investigating it too closely.

It may be entirely possible that your engine runs better when used regularly and makes more power at 3k RPM and hence possibly more speed.

Just a thought.
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Old 09-26-2000, 10:47 AM   #3
Nigel
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Member#: 1919
Join Date: Jul 2000
Location: Markham, Ontario, Canada
Vehicle:
1994 Legacy Turbo
Silver

Post

Thanks for responding Dave!

That would make sense if it were an automatic, but this is a manual trany. So, for a given rpm and gear, road speed should always be the same because you have a mechanical link between the engine and the trany. An automatic has a viscous (sp?) link to the engine and the relationship is not 100% proportional. Also, I still have that problem with cruise, which leads me to believe its the speedo cable. I just wish I could be more sure before I rip the dash apart to replace it.

Any other ideas?

Cheers!

Nigel
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Old 09-26-2000, 01:07 PM   #4
richeich
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Member#: 1353
Join Date: Apr 2000
Vehicle:
2001 Impreza 2.5RS
Silver

Post

We had a '92 Plymouth Voyager minivan that had a 'speed sensor', or 'speed sending unit', or something like that go bad in or on the tranny (automatic). The van ran fine, but the speedo would sometimes fluctuate wildly while driving down the road. If it acted up while the cruise was on, it would cause the van to buck and surge because the cruise was trying to maintain a steady 'speed' while the sending unit was jumping around. I don't know if there is such a beast in your Legacy, but it could be something similar.

Good Luck-
Rich
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Old 09-26-2000, 01:18 PM   #5
DLC
out back
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I'll examine my Haynes manual when i get a chance and see if such a thing exists on the 5-speed.
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Old 09-26-2000, 01:20 PM   #6
kevinsUBARU
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Location: Funky Kingston, NY
Vehicle:
2012 Impreza Sport

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I might just be talking worthless nonsense, but have you thought of putting some grease on the spedo cable? I have a 95 Impreza and when it gets cold out the grease freezes and causes the needle to shoot to 140mph. Just a thought, let me know how it works out!
Kevin
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Old 09-27-2000, 12:24 AM   #7
Ben
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Member#: 423
Join Date: Oct 1999
Chapter/Region: E. Canada
Location: Markham, Ont , Canada
Vehicle:
2002 WRX wagon
Silver

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Nigel, I'm Ben! Long time no talk!!
Are you always use the curise control?
if not, try to un-attach it to the thottle , sometime it may cost problem !
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Old 09-27-2000, 05:01 AM   #8
Nigel
Scooby Newbie
 
Member#: 1919
Join Date: Jul 2000
Location: Markham, Ontario, Canada
Vehicle:
1994 Legacy Turbo
Silver

Post

Hi guys.

The speedometer in the Legacy is cable driven, and has a speed sensor in the dash that reads off of the speedometer to operate cruise control (there's your answer Dave).

This is similar to the Plymouth that Rich describes (although, in that case the sensor is in the trany). So, it would make sense that if the speedometer cable were binding, it would cause cruise to be erratic.

Kevin verified that if the cable binds, it causes the speedometer to read high. Either that or he doesn't want to admit that he drives at 140MPH ;->. I think lubing it is a good idea.

Hi Ben. Unfortunately, I can't do without cruise. I drive to Windsor almost every weekend. That's 380Km's (236 miles)one way, and takes over 3 hours. I just can't drive that long without cruise.

By the way Ben, do you know of any shops in Toronto that sell Folia Tec Brake Caliper Lacquer? I tried BC Autodesign in Markham, but they don't cary it anymore.

So, it looks like the cable is the culprit.
Thanks guys! The cable is probably going to be a PITA to disconnect and I wanted to fairly certain that's where the problem lay before I tried to pull it.

Nigel

[This message has been edited by Nigel (edited September 27, 2000).]
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Old 09-27-2000, 01:50 PM   #9
Nigel
Scooby Newbie
 
Member#: 1919
Join Date: Jul 2000
Location: Markham, Ontario, Canada
Vehicle:
1994 Legacy Turbo
Silver

Post

Hi Ben. I thought about using engine enamel or something like that. I used clear VHT paint on the transmission housing for my 240Z. That stuff is good up to 1900deg F. It would probably work fine, but you have to bake the part for the best cure, like a powder coat. I didn't want to go through the hastle of tearing the caliper appart to do that though.

Anyway, I've not given up on the Folia Tec stuff yet. I'm looking for 'Racing Blue' by the way. My Legacy is silver. I have pics of it and I hope to get them up on Dave's sight soon.

Nigel
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Old 09-28-2000, 12:18 AM   #10
Ben
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Member#: 423
Join Date: Oct 1999
Chapter/Region: E. Canada
Location: Markham, Ont , Canada
Vehicle:
2002 WRX wagon
Silver

Post

Hi Nigle, what color you wants?
I know a supplier but forget he carry folia or not, BTW, if you really don't care the company of they made the color, those engine high heat print is really good and cheap, in Can. tire. I was use it to coustom print when I work at auto shop, but frist you have to clean the caliper first, and just print 2 to 3 layer, and it stays very long time and looks really good too!
BTW, Nigel, what color is your car???
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Old 09-28-2000, 12:33 AM   #11
Ben
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Member#: 423
Join Date: Oct 1999
Chapter/Region: E. Canada
Location: Markham, Ont , Canada
Vehicle:
2002 WRX wagon
Silver

Post

Hi Nigel, I will try to look to my friends shop to see what color he has, if he has what you needs, I will post it to the board and let you know!
There is a 2.5RS club of Toronto meeting this Sunday, the place is at Young St. and John (I'm sure before John st. if you come from South of Steels)
If you come from Steels, turn north from Young St. go north and after a downhill, you will see a Chinese plaza with HKSC Bank at the left side. If you come from North, just follow Young St. and before Steels or after John St. there is a Plaza that at the right side before the triffic light. You won't miss it and there should me some 2.5RS.
The meeting starts around 1:30pm and I was there last month and I'm the only Legacy turbo guy!
If you interesting please come and meet.
Hope to see you there this Sunday!
Enjoy your Legacy!
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