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mike164s
08-20-2014, 10:04 PM
ATM- I have your boost gauge kit and the depo gauge reads -2mmHG when the engine is turned off. It should be 0 and the gauge is possibly out of calibration. Is there anything that can be done to fix this? Thanks!

Tweak
08-20-2014, 10:19 PM
I may be wrong but I thought the Depo gauge does auto calibration.

TurboBullett@Ambient Thermal Management
08-21-2014, 04:45 AM
I may be wrong but I thought the Depo gauge does auto calibration.

Thanks Tweak that's correct the gauge auto calibrates to 0 when the vehicle is turned on!

BigT
08-21-2014, 07:22 AM
I haven't paid close attention to the gauge itself but I thought when the car is idling it should be pulling vac right? So if it's reading 0 at idle there is something wrong. But yes full sweep style gauges should auto calibrate once power is applied to them.

mudking
08-21-2014, 07:54 AM
I'm no car expert , but do have the same depo gauge and have never seen it at 0 when idle, always down around -24 for me without the AC on..

mike164s
08-21-2014, 08:01 AM
Hey guys the issue is when the engine is not running but there is still power going to the gauge. In accessory mode and after the engine is turned off

mike164s
08-21-2014, 08:03 AM
Thanks Tweak that's correct the gauge auto calibrates to 0 when the vehicle is turned on!

Yes and it does not do this!

mike164s
08-22-2014, 06:52 PM
ATM- any input on fixing the issue? I can take a video if need be. Thanks

TurboBullett@Ambient Thermal Management
08-22-2014, 07:24 PM
Mike,
When the car starts the gauge auto calibrates. It showing -2hg is such a small difference and won't affect ultimate boost level calibration. Certain barometric conditions can show as -2hg which is not equivalent to +2psi. Please take a video and I will forward it to depo USA as they ultimately warranty their gauges, we don't as we are not the manufacturer of the gauge.
-what does the gauge read at vacuum car started?
-what boost level does it peak at?
-Does this correspond to the tune you run?

mike164s
08-22-2014, 07:57 PM
Mike,
When the car starts the gauge auto calibrates. It showing -2hg is such a small difference and won't affect ultimate boost level calibration. Certain barometric conditions can show as -2hg which is not equivalent to +2psi. Please take a video and I will forward it to depo USA as they ultimately warranty their gauges, we don't as we are not the manufacturer of the gauge.
-what does the gauge read at vacuum car started?
-what boost level does it peak at?
-Does this correspond to the tune you run?

Thanks for the quick response. Sorry, not sure why I kept saying the units in mmHG and not PSI. Vacuum is at -24 and peak boost is 23psi. I run the RRM V2 piggyback.

Here's the video:

https://www.youtube.com/watch?v=t3hFIcNUDFQ&feature=youtu.be

https://www.youtube.com/watch?v=t3hFIcNUDFQ&feature=youtu.be

TurboBullett@Ambient Thermal Management
08-22-2014, 08:42 PM
-24 and +23 on that tune sounds like the gauge is calibrating correctly. However ill talk w depo and get their take on it, the gauge assembly is very simple just a sender and reciever so it's easy to diagnose!


Thanks for the quick response. Sorry, not sure why I kept saying the units in mmHG and not PSI. Vacuum is at -24 and peak boost is 23psi. I run the RRM V2 piggyback.

Here's the video:

https://www.youtube.com/watch?v=t3hFIcNUDFQ&feature=youtu.be

mike164s
08-23-2014, 08:24 AM
-24 and +23 on that tune sounds like the gauge is calibrating correctly. However ill talk w depo and get their take on it, the gauge assembly is very simple just a sender and reciever so it's easy to diagnose!

Ok sounds good. Thanks for the help!

mike164s
09-02-2014, 06:31 PM
Any news back from depo?

nilfinite
09-02-2014, 07:12 PM
My Depo Gauge has been going haywire the past couple of days. It looks like either the sender unit is off or the air filter could also be clogged.


http://youtu.be/R1rF7v48oqA

scrumby14
09-04-2014, 11:42 AM
I have the same issue, Depo gauge not reading zero when engine is off. (it worked fine for the first 3 months).... then it start getting to -1, -2, then -3.
Worst one is when I was up at Lake Tahoe (+6500ft elevation) i was getting -6. Now I'm back to -2 in the San Francisco Area (+100ft elevation)

My positive boost pressure seems to be reading correctly. +25psi peak, +21-22psi sustain. (w/ RRM U3 ECM) Even when I was up in Tahoe, i was getting about the same reading 25/22.

WegoFaster@Ambient Thermal Management
09-04-2014, 01:00 PM
The readings may very well be correct. Keep in mind that the barometric pressure outside changes with weather and altitude.

nilfinite
09-04-2014, 09:23 PM
The readings may very well be correct. Keep in mind that the barometric pressure outside changes with weather and altitude.

When I start up the car in the morning, the boost gauge will usually show nothing. Then it'll start jumping around crazily (-2 then 5 then -10 then -22) when I'm at a steady boost level on the freeway.

My guess, since the gauge usually starts working normally after some time, is that the air filter is clogged with blow-by oil. I tried flushing the air filter with soapy water yesterday, rinsed it and letting it dry now. Will see how it works afterwards. I checked the hoses on both sides of the air filter though and didn't see any oil so it might be the sender unit afterall.

scrumby14
09-05-2014, 06:28 PM
When I start up the car in the morning, the boost gauge will usually show nothing. Then it'll start jumping around crazily (-2 then 5 then -10 then -22) when I'm at a steady boost level on the freeway.

My guess, since the gauge usually starts working normally after some time, is that the air filter is clogged with blow-by oil. I tried flushing the air filter with soapy water yesterday, rinsed it and letting it dry now. Will see how it works afterwards. I checked the hoses on both sides of the air filter though and didn't see any oil so it might be the sender unit afterall.

nilfinite,

I think you have a faulty sender unit.
I forgot to mention. I had a faulty sender unit prior to getting the negative value (-2) when the engine is off. It would read sporadic pressure; even if the sender unit is not hooked up to the plenum (which should read 0) and it would just bounce around going crazy - kinda like what you're describing.

You can come by and let me try out your sender unit on my car (or vise versa) and pin point what’s the faulty part.

I live by Glen Park/Diamond Heights Area. (shoot me a PM, btw I'm out camping this weekend, so If i don't reply, I have no access to the internet)