02-15-2013, 10:03 AM | #29 |
NASA SpecE30 Racer
|
You are correct.
__________________
- King Tut
Street/Track Car: 2006 Honda S2000 TT3 || Race Car: 1987 BMW 325is SpecE30 || Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 || 2013 Subaru BRZ || 2012 Porsche Cayman R || 2009 Chevrolet Z06 || 2009 BMW M3 || 2004 BMW M3 || 2004 Nissan 350Z |
The Following User Says Thank You to King Tut For This Useful Post: | Sportsguy83 (02-15-2013) |
02-15-2013, 11:51 AM | #30 | |
Senior Member
Join Date: Jun 2012
Drives: 13 CSB BRZ Ltd
Location: United States
Posts: 1,035
Thanks: 147
Thanked 530 Times in 286 Posts
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
|
Quote:
-Acree |
|
The Following User Says Thank You to Acree For This Useful Post: | Sportsguy83 (02-15-2013) |
02-15-2013, 03:11 PM | #31 | |
Senior Member
Join Date: Feb 2012
Drives: 2013 DGM Subaru BRZ (Subie #9)
Location: ATL, US
Posts: 2,667
Thanks: 123
Thanked 860 Times in 552 Posts
Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Probably the easiest way to control dimming is use some kind of potentiometer unfortunately. Or build something to convert the PWM to an analog 0-12v signal... Those wires you are looking at go to the gauge cluster directly I believe to control lights which are not LEDs? So they use the old method where they are 4.1v hot all the time on one side and reversed 0-3.8v based on the dimmer switch. Just my guess. |
|
02-15-2013, 03:19 PM | #32 | |
Senior Member
Join Date: Jun 2012
Drives: 13 CSB BRZ Ltd
Location: United States
Posts: 1,035
Thanks: 147
Thanked 530 Times in 286 Posts
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
|
Quote:
And the gauge cluster is definitely LEDs... trust me on this. Check out my avatar. The picture below is the stock speedometer. -Acree |
|
02-15-2013, 03:38 PM | #33 |
Senior Member
Join Date: Jun 2012
Drives: 13 CSB BRZ Ltd
Location: United States
Posts: 1,035
Thanks: 147
Thanked 530 Times in 286 Posts
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
|
As far as the RPM is concerned, the Failsafe gauge is looking for a square wave input. It calculates the RPM based on the programmed pulses per revolution in the AEM Failsafe Configuration software. Unfortunately there is no digital tach signal wire going to the combination meter (aka instrument cluster aka gauge cluster). The current RPM value is shared via CANBUS between the combination meter and the engine control module. The only wire with the necessary square wave signal is going directly from the Crankshaft Position Sensor to the ECM.
I do not know enough about the stock CPS to be able to tell you if this will work or not for the Failsafe Gauge. It depends on two things: 1) Find out what the resolution is on the stock crankshaft sensor wheel. This will depend on what type of sensor it is. It's more than likely a hall effect sensor. I would imagine that it has a pretty high resolution, something along the lines of 50-80 pulses per revolution. 2) Download the Failsafe Configuration software from AEM and plug in your failsafe gauge. Check the RPM Pulses per Revolution option and make sure you can select the same Pulses/Rev as the stock sensor. If all of this checks out, I can figure out where and which wire you should splice into. I do have to warn, in general as an EE, I would recommend against messing with any of the stock Crankshaft Position Sensor wiring. If you mess up that sensor, the wire, or the ECM, it's going to be pricey and labor intensive to fix it. -Acree |
02-15-2013, 03:56 PM | #34 |
NASA SpecE30 Racer
|
I am almost positive I got a PM from someone who hooked up the RPM wire of the failsafe to one of the wires I mentioned and that it worked. I checked my PMs, but I must have deleted it.
__________________
- King Tut
Street/Track Car: 2006 Honda S2000 TT3 || Race Car: 1987 BMW 325is SpecE30 || Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 || 2013 Subaru BRZ || 2012 Porsche Cayman R || 2009 Chevrolet Z06 || 2009 BMW M3 || 2004 BMW M3 || 2004 Nissan 350Z |
02-15-2013, 04:07 PM | #35 | |
Senior Member
Join Date: Feb 2012
Drives: 2013 DGM Subaru BRZ (Subie #9)
Location: ATL, US
Posts: 2,667
Thanks: 123
Thanked 860 Times in 552 Posts
Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
|
Quote:
What do you suppose the roughly 4v signals are used for? Are those just regulated voltages for the cluster LEDs? |
|
02-15-2013, 05:33 PM | #36 | |
Senior Member
Join Date: Jun 2012
Drives: 13 CSB BRZ Ltd
Location: United States
Posts: 1,035
Thanks: 147
Thanked 530 Times in 286 Posts
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
|
Quote:
What I am fairly certain of is the 4.1v is definitely not providing any power to the LEDs in the cluster. The illumination LEDs are internally regulated and grounded, either through the warning LED driver or the CPU. King Tut, I rechecked your post and I have to apologize. I definitely missed your details regarding the two wires. I do believe that the gray wire coming out of D48 would be suitable for the Tach signal. According to the wiring manual, it's coming out of the ECM labeled as "TACH." -Acree Last edited by Acree; 02-18-2013 at 01:21 PM. |
|
02-15-2013, 09:26 PM | #37 | ||
I Love custom Turbo kits
Join Date: Mar 2012
Drives: Limited BRZ
Location: Miami
Posts: 10,770
Thanks: 20,004
Thanked 8,343 Times in 4,361 Posts
Mentioned: 441 Post(s)
Tagged: 12 Thread(s)
|
Quote:
Quote:
I appreciate a LOT all of your help, including @dwx.
__________________
|
||
02-15-2013, 10:26 PM | #38 |
NASA SpecE30 Racer
|
Check pages 41 and 42 of the BRZwiring PDF for the locations of the two connectors that should have the tach signal. I don't know that you will find one behind the cluster. The gauge comes with plenty of wire to get to that side of the car though.
__________________
- King Tut
Street/Track Car: 2006 Honda S2000 TT3 || Race Car: 1987 BMW 325is SpecE30 || Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 || 2013 Subaru BRZ || 2012 Porsche Cayman R || 2009 Chevrolet Z06 || 2009 BMW M3 || 2004 BMW M3 || 2004 Nissan 350Z |
The Following User Says Thank You to King Tut For This Useful Post: | Sportsguy83 (02-16-2013) |
02-24-2013, 08:54 PM | #39 |
I Love custom Turbo kits
Join Date: Mar 2012
Drives: Limited BRZ
Location: Miami
Posts: 10,770
Thanks: 20,004
Thanked 8,343 Times in 4,361 Posts
Mentioned: 441 Post(s)
Tagged: 12 Thread(s)
|
@Acree, I wonder if you got any more thoughts/ideas on the gauge dimming source. I still don't have my cluster, but just getting ready for it
|
02-25-2013, 10:24 AM | #40 |
Senior Member
Join Date: Feb 2012
Drives: 2013 DGM Subaru BRZ (Subie #9)
Location: ATL, US
Posts: 2,667
Thanks: 123
Thanked 860 Times in 552 Posts
Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
|
Hey, as far as hooking up the illumination wire for my Greddy gauge, I used the Ill+ which is just a constant 12v switched on with the headlights. You can use the TAIL or PANEL fuses, they both go to 12v when the headlights are turned on. With that particular gauge, it doesn't use the 12v for powering the LED backlight, it just uses it to trigger the gauge to dim when it senses voltage on the line.
Getting something to dim with the dimmer (if that's your goal) is going to require some custom circuitry just like with the older Subaru models. |
02-25-2013, 10:40 AM | #41 |
Senior Member
Join Date: Oct 2012
Drives: 2013 Subaru BR-Z Limited
Location: Fort Lauderdale, Florida
Posts: 883
Thanks: 407
Thanked 562 Times in 294 Posts
Mentioned: 42 Post(s)
Tagged: 4 Thread(s)
|
@Sportsguy83 I know I'm a little bit north of you but I'd be happy to help... If you have ever watched Street Customs then you would know I'm the "car audio guru"
@Acree has posted some very useful and technical information and he def knows what he's talking about. I'm sure I can get the dimmer to work properly in the aftermarket gauges...I've never let one beat me to date and in not about to start now.
__________________
|
The Following User Says Thank You to chadstyle For This Useful Post: | Sportsguy83 (02-25-2013) |
02-25-2013, 11:01 PM | #42 | |
I Love custom Turbo kits
Join Date: Mar 2012
Drives: Limited BRZ
Location: Miami
Posts: 10,770
Thanks: 20,004
Thanked 8,343 Times in 4,361 Posts
Mentioned: 441 Post(s)
Tagged: 12 Thread(s)
|
Quote:
Where is the Ill+ located? I'm sorry for the stupid questions... Last edited by Sportsguy83; 02-25-2013 at 11:15 PM. |
|
|
|
Tags |
dash, gauge, gaugle cluster, pod |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
What is that blinking dash light when the car is off? | JayNutter | Scion FR-S / Toyota 86 GT86 General Forum | 7 | 02-03-2014 10:59 AM |
WTB: FRS instrument cluster | jabbajaw99 | Interior Parts (Incl. Lighting) | 3 | 02-14-2013 01:31 PM |
surprised at how much MORE i like the frs dash cluster | pr086 | Scion FR-S / Toyota 86 GT86 General Forum | 26 | 12-07-2012 09:09 PM |
Flashing Security Light in Dash? | ravenMTgirl | Electronics | Audio | NAV | Infotainment | 8 | 11-21-2012 03:25 PM |
Scratches on my Cluster. | Superhatch | BRZ First-Gen (2012+) -- General Topics | 5 | 08-21-2012 07:50 AM |