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Old 08-31-2012, 09:33 AM   #1
Vlad
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Default Sti feature question

I have my 02 WRX since many years, but have not been at many Subaru gatherings and don't know much about certain Sti features.
I'm now upgrading to some Sti parts so, have questions about how they are designed to work.

As far as the GD Sti, '04-'07:

-Do you guys still have the dimmer on the left stalk on the steering collumn, in the form of the ring that adjusts the brightness, or do you only adjust the brightness with the rod that goes through the cluster?

Do the later Sti cars, '06, '07 loose the rod in cluster dimmer?

-I'm trying to get an idea about that rear diff temp light, am looking for some random testimonials: did you ever see that light on? in commute ever, at the track ever? often? never?
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Old 08-31-2012, 10:17 AM   #2
indytruckboy
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< 04 STI, dimmer on stalk on column.

never seen my rear diff light come one. but i maintain my car. i imagine it comes on if you get low in oil and smoke the gears
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Old 09-01-2012, 09:03 AM   #3
talvai
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04-06 sti cluster have dimmer on the cluster. 07sti is different. Look on the cluster gauge thread that has a ton of posts. Has pretty much any swap you want.

Rear diff temp light goes on when it reaches certain temperatures. I have never seen it come on during commute regardless of length. I don't track my car all that much so can't comment there but have heard people say it does occasionally. Which is why STi and others made a cover that is larger which allows more oil to be used. STi rear diff cover I think goes for $900 but could be a little off. Perrin makes one too and a few others.

Rear diff sensor light does more than just tell you its hot though. OEM it also talks to DCCD controller to set it to full lock. This is to limit the amount of power going to the rear diff allowing it to cool down. I have a dccdpro one and could probably do the same but never connected it. If I see it on I can set it to manual and adjust it myself.
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Old 09-01-2012, 01:05 PM   #4
Vlad
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I've read your thread about the rear diff temp sensor. It's a good article, thanks.
I was surprised that the factory did not choose to put the sensor in the drain hole, where it would have more contact with the oil, but I saw that all sources show the sensor in the filler hole and this is where I will install it too.
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Old 09-02-2012, 09:35 AM   #5
talvai
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Quote:
Originally Posted by Vlad View Post
I've read your thread about the rear diff temp sensor. It's a good article, thanks.
I was surprised that the factory did not choose to put the sensor in the drain hole, where it would have more contact with the oil, but I saw that all sources show the sensor in the filler hole and this is where I will install it too.
No idea either. Would be more accurate number I would guess too. Thanks. Working on trying to get the light to automatically lock the center diff on aftermarket controller too. Got to find time though
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Old 09-02-2012, 12:37 PM   #6
Vlad
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As far as the intercooler spray low warning in the dash, is that something that does not light up when the key is on, to be checked, like the rest of the warning lights?
Or does this not light unless it's connected to that level contact?
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Old 09-02-2012, 02:14 PM   #7
talvai
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Quote:
Originally Posted by Vlad View Post
As far as the intercooler spray low warning in the dash, is that something that does not light up when the key is on, to be checked, like the rest of the warning lights?
Or does this not light unless it's connected to that level contact?
If its correctly hooked up it only goes on when fluid reach certain level. I think even if car is off and key is on position it doesn't light up
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Old 09-02-2012, 02:29 PM   #8
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thanks.
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Old 09-07-2012, 07:36 AM   #9
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New Question:

I have a copy of an Sti Owner's manual, for, I think, 2004.

I am running this 2004 Sti cluster with a JDM Sti Engine with 8000 RPM redline.
I have confirmed the cluster is 2004 by seeing there's no ABS light while running, although the ABS does the witness light-up at start-up.

The owner's manual says that the cluster shift-up light is adjustable to 7500 rpm.

I can adjust mine only upto 7000 RPM, as shown by the needle during adjustment.

Is it maybe that when you adjust with the needle pointing to 7000 you're actually adjusting to 7500? Or is it common knowledge that you can only adjust to 7000?
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Old 09-07-2012, 08:27 AM   #10
talvai
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You know that is a good question. No idea. If I had to guess, they set a max in the cluster to 7k, because that is max from factory it will go. Going to guess JDM clusters though go to 8k though because engines from factory go that high.

Swap for JDM one? Not sure if you like me though that doesn't want it because its in kmph only.
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Old 09-07-2012, 08:51 AM   #11
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No, I'll stay with USDM.
IAP makes a harness that converts the speedometer and odometer to Miles, but 180 MPH speedometer is not needed for me.
Then there's the Spec C speedometer, to 260 Km/h that is really useless when converted to indicate MPH.

No, 7000 will be enough of a threshold for shift up light for me. 7500 would be nice to have though.

The only think I will convert will be the Tach, I will convert it to begin the redline at 8000. But that will be display only.

I can't believe that these days tacoma speedometers charges $105, including shipping to fix the mileage.
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Old 09-07-2012, 12:38 PM   #12
talvai
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Quote:
Originally Posted by Vlad View Post
No, I'll stay with USDM.
IAP makes a harness that converts the speedometer and odometer to Miles, but 180 MPH speedometer is not needed for me.
Then there's the Spec C speedometer, to 260 Km/h that is really useless when converted to indicate MPH.

No, 7000 will be enough of a threshold for shift up light for me. 7500 would be nice to have though.

The only think I will convert will be the Tach, I will convert it to begin the redline at 8000. But that will be display only.

I can't believe that these days tacoma speedometers charges $105, including shipping to fix the mileage.
Damn they upped that. When I did mine think it was only $75-80. But they did a good job. You know maybe they will be able to reprogram the redline for you. Again have to imagine that is a set limit on the chip. Worth an ask.
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Old 09-20-2012, 03:39 PM   #13
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So, I'm spending a bit more time figuring the cluster out:
The dimming feature, I think was meant to adjust how much lower it dims to when the headlights are on. With illum at max (i think 5) it doesn't dim at all, with illum at 4 it dims quite a lot.
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Old 09-21-2012, 11:16 AM   #14
Vlad
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So, weird enough, the outside temperature display on my USDM Sti cluster changes. I have no idea why.
I have not installed any sensor yet and not looked to see if I have to switch the pins for the temp sensor to a different position.
It showed 40F to begin with and this morning 25F.
I thought 40F may either be a value it recorded last time the sensor worked or a value caused by default wiring resistance.
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Old 09-21-2012, 12:46 PM   #15
talvai
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Temp sensor is fine. Even without sensor installed it will still read something. Not accurate but will give you something.

Yea between 5 and 4 big difference and 4,3,2,1 is a slightly less. 5 is used more for daytime so that you can still see the cluster even if its super bright out. Were you trying to get something between 5 and 4? I think 4 is perfect. Just me though
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Old 09-21-2012, 02:13 PM   #16
Vlad
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Well I have the integrated module coming in mail so will let you know if I have dimming from stalk.

But I thought that this particular dimmer is mainly there to select how much of a gap you want in your cluster brightness when you turn the headlights on.
If you select 5 you want same level night or day.
However, it can also be used as dimmer.

Edit: So it's normal for the temperature displayed in the cluster to change, even with no sensor attached, weird..

Last edited by Vlad; 09-21-2012 at 02:35 PM.
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Old 09-21-2012, 04:03 PM   #17
talvai
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Little confused. If you set the cluster to 4 then when you turn on your headlights via the stalk it will dim the cluster. When you turn your headlights off it will go back to 5 for full bright. Only exception to this I think was 07 sti clusters. Their was a huge cluster swap thread here somewhere where they talked about that

Same thread talked about the temp readout, how it will show something regardless if you have sensor or not. Want to say it would be also 30-40F off from actual temp. But if you get the sensor will work like a champ. Sensor is the same on the WRX limited too because that is what I have and temp read out was exact.
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Old 09-21-2012, 04:30 PM   #18
Vlad
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Very nice about the sensor, I have the Sti part number on order.

As far as the cluster dimmer, let me check one more time, to make sure I don't have it wrong, but here's what I think my 2002 Sti cluster does:

Set it to 4:
Turn on headlights, it dims.
Turn off headlights goes back to 4. 4 is not as bright with headlights off (in sunlight) as 5.

Set it to 5:
Turn on the headlights, it does not dim, stays as bright. Turn headlights off, stays as bright.

Se it to 3:
Turn on headlights, dims deeper, it less bright than it is with 4. Turn the headlights off, goes back to 3, which is less bright than 4.

With headlights off, in daytime mode, 5-4-3 is not too different
With headlights on, 5 is like daytime, 4 is much darker, etc.

I think, the way this is meant to work is: you set the Ill level based on what you want to happen at night (much darker than day, or not really), then you adjust the regular dimmer on the stalk, just like you would on a WRX.
The purpose is to avoid you being distracted at night.

I think ,the reason there are two dimmers is because there is daytime illumination, normal cars don't have that, therefore need only one dimmer.
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Old 09-22-2012, 10:14 AM   #19
Vlad
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Hey, anybody know the location of the pre-wired plug for the outside temperature sensor withe the WRX?
I know it's supposed to be somewhere in front of radiator need more specific info.
I thought that the socket would branch out from the harness of the middle/ top horn, but it's not on that harness.
I mean, is this a myth, is there no plug? Each time someone asks where it is, there are all kind of answers regarding how useful or not it is.
On scoobymods, the guy pretty much details installation of a new harness, does not seem at all like he found an existing plug and he tried it, before manufacturing that electronic adapter.

Is it in the driver's fog light gap? I'll look there first, any answers on topic appreciated.
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Old 09-22-2012, 03:38 PM   #20
Vlad
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So it's not in the driver's side foglight gap and it's not under the radiator.
I found a drawing showing that it's supposed to snap in place (the sensor) onto a vertical bracket that I can see in front of the radiator.

This bracket comes up from the sheetmetal below the radiator, it's roughly 1" away from it and on the bottom grill opening.

The wiring harness must have been in the same branch with the middle horn, and my car is not outfitted with this harness, or the connector is tucked inside the main corrugated tube where the front harness passes under the radiator.

I'm going to look at part numbers, to see if there is a with temperature and a without temperature front harness..
Edit: There is only one front harness part number for all WRX. It changes part numbers for mid to late '02.
There are no applicabillity notes. Neither are there for the them sensor.
There is also a sun load sensor that goes by the wipers

The drawing of the front harness shows this coming out of the main tube in the same location as the middle horn wire.
Now, I'm willing to believe that they tucked the wiring in, but that would "clog" the the whole corugated tube, this connector is probably 1/2" diameter.
So, this front harness plugs into the bulkhead harness behind the cluster.
I'll try to see if the pins for the sensor are leaving that connector or dead-ending there.

Last edited by Vlad; 09-22-2012 at 04:14 PM.
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Old 09-23-2012, 10:30 PM   #21
azscooby
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The original mounting position is on the drivers side in front of the radiator - the temp sensor snaps right into that location. You can see it if you get down in front of your car.

I have mine up and working on an 05 STI cluster with working OAT.

Funny thing on my temp sensor - if I turn the key quickly and start the car, the temperature is correct. If I delay at the "ACC" position the reading will be like 20 degrees off.
I believe this has something to do with the power supply to my 5V regulator, but I have yet to have a chance to change power supply inputs. Not sure why it does it, but it does.
Took me forever to figure it out - now I just need to get a different power supply input.
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Old 09-23-2012, 11:01 PM   #22
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Yes, I know the position at this point. What about the wiring? Did you locate the pre-wiring connector in place?
Also, what body is your car? '02 WRX sedan?

I just finished tracing the wires out of the B connector by the cluster. The proper wires are leaving the cluster.
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Old 09-23-2012, 11:35 PM   #23
azscooby
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No, I never found the harness, but I was under the impression it wasn't there anyway, so I never looked.
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Old 09-24-2012, 07:18 AM   #24
Vlad
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I will continue a bit further with this, mabe try to see if I can borrow wiring traving equipment.

What bothers me is the coincidence between wiring leaving the cluster, nothing arriving by the bracket designed to hold the sensor and a reading (that varies, mind you!) being put out to the display.

This is a thermistor, so it's resistance varies with temperature. The circuitry measures the resistance and puts out a number.
Infinity resistance should put out a no number. Certainly not a variable number.
There is something connected to this somewhere in the wiring..
I'm starting to sound like in a bad horror movie.
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Old 09-24-2012, 04:26 PM   #25
AFBeefcake
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On my 02 wrx there are wires that leave the cluster for the out side temp but they stop at the SMJ connector at the drivers side fender.

When I first installed my cluster (STi prodrive UK v8 DCCD) with out the temp sensor or regulator my cluster would be blank, then read --- F after getting to like 15 mph.

I believe it works by a voltage divider.


You can see that the cluster gets connected at 3 points. 5 Volts from the regulator, a voltage before the sensor and a return for the sensor.
The cluster compares the regulator output to the voltage at the divider and then does something (a calculation I think) to get the temp that is displayed.

I do believe it also has some other logic. Like remembering the last temp displayed until you hit like 15 mph or something like that.
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