Last post on Feb 02, 2012 at 10:28 AM
You are in the Subaru Forester
What is this discussion about?
Subaru Forester, Wagon
#43 of 134 Re: Temp indicator on 2011 non-turbo? [ateixeira]
Jan 20, 2011 (12:02 pm)
Yup, even the need is a dummy gauge. Cold, Normal, Hot.
When I was discussing putting gauges in with the forester/impreza guru at Subaru, I told him for the STi I would like to see digital gauges similar to the ones I have in my CTSV, which is a small LCD panel embedded in the cluster where you can scroll through several gauges that show things in digital/analog format on a dot-matrix screen.
Tire Pressure (4 corners on a car)
Trans Temp (even though it's a MT)
I told him to add in a boost gauge for the STi as well.
The great thing is that if any of them move outside the normal range, it automatically switches to that gauge and flashes a warning and beeps. It was great on track when I was over-driving my tires on the caddy, the pressure increased and I got an over-pressure warning.
Similarly with my caddy when I was pushing real hard my oil temp went to 275 and it flashed me warning me that it was too hot.
This is technology standard in my 2005 CTSV, so hopefully we'll see this in the future on at least the premium models.
#44 of 134 Re: Temp indicator on 2011 non-turbo? [paisan]
Jan 21, 2011 (8:00 am)
Agreed - STI models should include things like that, to justify the cost difference from a regular WRX.
#45 of 134 Re: Temp indicator on 2011 non-turbo? [aatherton]
Jan 22, 2011 (6:55 am)
Some may prefer the needle even if it is a dummy gauge, as it does show movement which dummy lights cannot. The needle slowly moves from cold to normal, where it stays throughout a 50-degree operating range, and then it will slowly move again if the normal range is exceeded. (I have never actually seen that.)
What I like about the digital ScanGauge is the ability to see the actual temperature within the operating range.
For instance, I can see on my Scion that using the heater too soon drives the temperature down a few degrees, and even though the blue light goes out at 139 degrees, it takes a very long time or never for the tiny motor to reach full 184-degree operating temperature in winter stop-and-shop errand driving with passengers hogging the heat.
It is also interesting to hear the fan come on idling in summer traffic, look down and watch 210 degrees drop to 200 degrees, and wonder how many degrees it would take for the red light to come on.
#46 of 134 Re: Temp indicator on 2011 non-turbo? [aatherton]
Jan 22, 2011 (6:30 pm)
Just an FYI, those temps are only as good as the sensors sending the information. Really any gauges you see on a car are only useful to see if the car is running outside of where it normally runs.
Subaru Guru and Track Instructor
#47 of 134 Re: Temp indicator on 2011 non-turbo? [paisan]
Jan 23, 2011 (7:09 am)
The ScanGauge does not use sensors. It plugs into the car's OBDII port under the dash, and reads data from the car's own ECU (computer).
It can show 12 readings, but only 4 at a time.
The ECU gets its data to monitor and run the engine from the car's own sensors, as you say.
It is interesting, if not useful, to watch the such things as coolant temperature (FWT), intake air temperature (IAT), timing advance, voltage, fuel rate, while they vary in reaction to driving conditions.
For instance, IAT. When cold started, the IAT and FWT are the same, say 25F degrees. As you drive off, the FWT temperature climbs toward normal, but can be reversed for a moment by turning the heater on full fan and full vent. The IAT will continue to be 25F even when the engine is warmed up up, as long as the car is moving relatively fast. Once the engine is stopped and frigid air is no longer being drawn in, the intake system absorbs heat from the hot engine, and the IAT after a restart will be warmer than ambient. Cruising on the Interstate, IAT will stabilize around 7F above ambient. Idling in traffic on a hot summer day with AC, the IAT can rise to 50F above ambient.
All this info may not be useful, but it is at least interesting to watch the information coming out of the ECU.
#48 of 134 Re: Temp indicator on 2011 non-turbo? [aatherton]
Jan 23, 2011 (9:37 am)
I think you misunderstood me. The temperatures that the sensors that the OBDII read are not necessarily correct. The tolerances on the sensors isn't as precise as one would think. A lot of the ECU logic takes into account variances from normal, not absolute temperatures.
A lot of folks read gauges (be them OBDII or regular gauges) as absolute but really they are only useful to see when there is a problem if it's operating outside of your normal area.
I can push the temps down on my caddy by running the AC/Defroster by about 15 degrees F because that forces the fans to come on even if the ECU isn't calling for them to be on.
Subaru Guru and Track Instructor
#49 of 134 Re: Temp indicator on 2011 non-turbo? [paisan]
Jan 24, 2011 (6:07 pm)
You said "I can push the temps down on my caddy by running the AC/Defroster by about 15 degrees F because that forces the fans to come on even if the ECU isn't calling for them to be on. "
By turning manually turning on the fans with the AC/defroster switch, you cause them to reduce the coolant that 15 degrees, which the ECU then recognizes.
Is summer, when the AC causes the coolant temperature to reach 110 degrees, the sensor turns on my fans and reduces the coolant by 15 degrees, which the ECU then recognizes.
Whether the radiator fans are turned on by you or by a sensor, the ECU only sees the actual temperature and does not care what caused that temperature.
#50 of 134 Re: Temp indicator on 2011 non-turbo? [aatherton]
Jan 27, 2011 (4:08 pm)
Right but those temps are not accurate. All sensors in a car are really only relative to "normal".
My point being if you see 200 degrees on your gauge, the ACTUAL temp may be 195 degrees or 210 degrees.
Gauges are only useful to see when something changes. For instance your car normally runs at say 200 degrees, well if all of a sudden it's running at 220 degrees you know there is an issue.
The temp may not actually be 220 but there is something going on.
A lot of folks believe the numbers they see on OBDII readers or gauges but they are really just supposed to be used for variance readings.
#51 of 134 Thinking of a Forester
Jan 31, 2011 (11:52 am)
My family moved to southern, Fairfield County, CT (10 miles from NY border) over the summer and we've found driving around this winter to be pretty difficult. Both my 2001 Honda Prelude Type SH & my wife's 2010 Acura TSX are equipped with Michelin Pilot Arctic Alpin snow tires at all 4 corners. They don't seem to plow very well, at least not when I leave for work at 6:30 AM to drive to the South Bronx. My wife has had some difficulty navigating semi or barely plowed streets as well as snow banks at the foot of people's driveways. I'm thinking of possibly replacing her TSX with a Forester Limited XT. I like the ground clearance, standard AWD, the fact that you "sit down in it" like a car (as opposed to the "sit on top of it" like an SUV), the cargo room (although our Acura has a very deep and spacious trunk), Subaru's reputation for reliability (Her Dad is on his 3rd Outback) & quality.
One of my concerns is with the transmission. The Automatic is a 4 speed which is pretty archaic (I'm sure it is bulletproof by now, but even GM has 6 speed autos now). Are there plans out there to bring the CVT to the Forester line? Can the CVT handle the torque of the turbo or are they developing a 6 speed automatic?
#52 of 134 Re: Thinking of a Forester [nyccarguy]
Feb 01, 2011 (7:59 am)
I think the CVT is very likely, though we're not sure when.
The XT's engine is very torquey so it's still more than quick enough. My wife has a non-turbo model and even that is adequate.
8.9" of ground clearance and 25 degree approach and departure angles are class-best for the crossovers that aren't trucky.
We love ours.
One BIG problem, though - we fight for the keys when it snows. Today she won, so I had to park my Miata (summer tires) and drive the family minivan to work.