Has anyone done a CarPlay retrofit / Headunit replacement for 991.1
08-14-2024, 04:28 PM
#3707
What if you pull the rear speaker wires from the OEM amp and connect the speakers directly to the relevant speaker outputs on the HU? Then the fronts would be powered by the OEM amp and the rears by the HU amp. The problem I can see there is a difference in output which may require attenuation or a separate potentiometer. Any good?
08-14-2024, 04:31 PM
#3708
I've placed an order for a 7870C from https://www.aliexpress.us/item/3256807205711960.html
08-14-2024, 04:35 PM
#3709
If anyone is thinking of doing this with the CHSTEK, the optical out for these does not exist :P (there an empty hole for it, but there's nothing soldered to this part). I checked and was hoping it was.
Last edited by bmxtreme; 08-14-2024 at 04:36 PM.
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StanfordBear (08-14-2024)
08-14-2024, 04:39 PM
#3710
My unit (7862)should arrive on Monday so I'm looking forward to that. I am still trying to figure out which way to go on the TPMS, which is better internal or external? @andy2111 do you by any chance have a pic of your Erisin ones installed?
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ralphsmit (08-15-2024)
08-14-2024, 05:05 PM
#3711
Racer
On the subject of aftermarket TPMS: Does anyone know how they connect with the HU? It looks like most of them use Bluetooth? If so, many of the units out there might not work with the CHESTEK units since they seem not to work with most Bluetooth devices. Do you have to get a set that communicates to an external unit that plugs into the USB of the HU and not one that communicates directly thru Bluetooth with the HU?
08-14-2024, 05:38 PM
#3712
Rennlist Member
They work just fine. The controller box connects via USB and that communicates with the pressure sensors wirelessly. Works perfectly for me.
They all work this way eg external box that connects via USB. Look up the Erisin TPMS unit as a few of us have installed it.
They all work this way eg external box that connects via USB. Look up the Erisin TPMS unit as a few of us have installed it.
Last edited by andy2111; 08-14-2024 at 05:53 PM.
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ZedZed (08-15-2024)
08-14-2024, 06:04 PM
#3713
That's a good point and one I had forgotten. My ZWNAV has an optical output (IIRC) but I am not using it. Do you have a link to the relevant adapter? I could easily use my optical output directly to the orange fiber connections to my Bose amp if I had such an adapter. TBH, I don't believe the SQ will be audibly different, but in a 'purist' sense it might be worth doing. I am not hearing any difference in SQ between what I had with the PCM and what I have with the ZWNAV.
The ZWNAV was my first incursion into these aftermarket HUs and, at the time, I knew very little about them. I slavishly followed some very good YT videos when connecting up (shout out to @Santirx), and so I ignored the optical output on my unit. Not hearing any difference in sound quality after installation, it's never occurred to me to try the optical connector until your post just reminded me of its existence.
The ZWNAV was my first incursion into these aftermarket HUs and, at the time, I knew very little about them. I slavishly followed some very good YT videos when connecting up (shout out to @Santirx), and so I ignored the optical output on my unit. Not hearing any difference in sound quality after installation, it's never occurred to me to try the optical connector until your post just reminded me of its existence.
As pure of a signal as I could get it.
But there are good optical to MOST converters out there that will allow you to preserve digital signal.
08-14-2024, 08:10 PM
#3714
Racer
Asking for a friend:
He has the CDR31 with Bose. Is the unit and MOST the same as the one for the PCM3.1? What about the FACRA adapters? The guide only mentions PCM, but I know some on here have replaced a CDR unit, I'm guessing it is the same, but I just want to make sure he orders the correct unit.
He has the CDR31 with Bose. Is the unit and MOST the same as the one for the PCM3.1? What about the FACRA adapters? The guide only mentions PCM, but I know some on here have replaced a CDR unit, I'm guessing it is the same, but I just want to make sure he orders the correct unit.
08-14-2024, 09:23 PM
#3715
Rennlist Member
As long as the basics work for now it'll be fine
08-15-2024, 02:22 AM
#3716
Rennlist Member
Asking for a friend:
He has the CDR31 with Bose. Is the unit and MOST the same as the one for the PCM3.1? What about the FACRA adapters? The guide only mentions PCM, but I know some on here have replaced a CDR unit, I'm guessing it is the same, but I just want to make sure he orders the correct unit.
He has the CDR31 with Bose. Is the unit and MOST the same as the one for the PCM3.1? What about the FACRA adapters? The guide only mentions PCM, but I know some on here have replaced a CDR unit, I'm guessing it is the same, but I just want to make sure he orders the correct unit.
I'd expect everything else to work and then your friend would use the supplied GPS antenna to get nav working
Any other views on this?
08-15-2024, 09:24 AM
#3717
Hey. No, the unit in my Panamera is a ZWNAV 12.3" widescreen and is different in many ways to the Erisin/CHSTEK type units. But this volume control thing has been designed to work with the steering wheel control wires. Mine are labelled SWC1 and SWC2, but this will be the same functionality as yours, labelled Key1 and Key2. It's weird that this doesn't work with your car. You may be right that the canbus has hijacked something, or possibly Key1 and Key2 in the CHSTEK units are not functioning in the way we expect them to. If you are certain that you have wired the volume control unit correctly to power, ground and Key1 (always worth remaking connections as part of routine troubleshooting IMO), then I am afraid I am at a loss as to why it isn't working.
I am ***-u-m-ing that your car does not have factory steering wheel controls? (On the basis that if it does, they ought to work with the CHSTEK anyway). And that there isn't some extra step in the CHSTEK steering wheel control menu section that you need to take?
Just for the avoidance of doubt, this is the unit I ordered from Ali Express:
Wireless Multi-function Steering Wheel Control for Android Car Radio DVD GPS Multimedia Remote Control Buttons 2 Din Universal - AliExpress 34
I am ***-u-m-ing that your car does not have factory steering wheel controls? (On the basis that if it does, they ought to work with the CHSTEK anyway). And that there isn't some extra step in the CHSTEK steering wheel control menu section that you need to take?
Just for the avoidance of doubt, this is the unit I ordered from Ali Express:
Wireless Multi-function Steering Wheel Control for Android Car Radio DVD GPS Multimedia Remote Control Buttons 2 Din Universal - AliExpress 34
Just wanted to circle back that the remote eventually works. I don't know what I did, but it magically let me set the buttons to control. So I have a remote now 😅
08-15-2024, 09:57 AM
#3718
Burning Brakes
I agree entirely - not worth the effort. I have a car with Bose and a car without, and in both cars the sound is at least as good as it was before fitting the new HU. In fact, I'd say it is better in the non-Bose Cayman. I was just throwing it out there as an option for those who believe it may well be worth the effort. I think there is too much focus on this TBH. Most will be happy with the sound after installing their Android HU. For the few who are not, there are various options, as described in this thread. The real question is how good SQ can be in any car, considering what an atrocious acoustic environment it is.
08-15-2024, 09:59 AM
#3719
Burning Brakes
Yes - I should have been more clear that this is an option for me in my ZWNAV unit, which is quite different to the CHSTEK and Erisin units discussed mostly in the thread.
08-15-2024, 10:02 AM
#3720
Burning Brakes
In my latest iteration, I’m actually going directly from my head unit spdif toslink optical output to my aftermarket amplifier spdif toslink optical input. So, going direct, not even through MOST25.
As pure of a signal as I could get it.
But there are good optical to MOST converters out there that will allow you to preserve digital signal.
As pure of a signal as I could get it.
But there are good optical to MOST converters out there that will allow you to preserve digital signal.