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Do you regret AP3 upgrade with MCU1?

AndrewTX

Member
Feb 15, 2017
203
158
Houston, Texas
I wanted to take the pulse of the community on whether or not I should upgrade to AP3 without changing the MCU on my 2017 MS75 with AP2.0/MCU1.

I've already paid for FSD during the $2K sale last year and have a service appointment next week for the screen yellowing and some other issues. My service advisor noted that they've scheduled the AP3 upgrade at the same time, without my asking for it.
I've been hesitant to go for the MCU upgrade because I still actually listen to terrestrial radio and the stations I listen to are not on TuneIn. Plus, I would imagine that the lack of radio won't help resale value.

I've read as many of the threads as I can find about the MCU upgrade and how MCU1 interacts with AP3. But I'd really like to get a consensus from those who've gone through the process. Are you happy with your decision to keep MCU1 with AP3 or do you regret it? Are you now considering going forward with MCU2 because of the performance impact you've seen?

Thanks for sharing your experience.
 

luckyj

Member
Dec 8, 2016
413
495
Northern Virginia, USA
The main issue I have is that Telacam is now available, but is basically useless. It records video, but while it does, MCU1 becomes very slow and unstable, and the video is not good. Not sure if it's my USB devices, but I've tried two with the same result. I've seen others complain of the same issue. Other than that, I have not really noticed much of a performance issue.
 

Tesomega

Member
Sep 28, 2017
285
188
Pittsburg, CA
I waiting for one more year before making a decision on MCU2, I have FSD, I want to see what features are going to be delivered and how much of FSD can be handled by MCU1. I am hoping all FSD features can be handled on MCU1. I am not very eager for bells and whistles.
 

mthoring

Member
Jul 7, 2019
14
27
Norway
Sure dashcam makes MCU1 slower, but thats always been the case for AP 2,5 owners. Otherwise the MCU(1) behaves exactly as before. I had the upgrade done in April, so I would have had plenty time to notice any differences.
 
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Prowler

Member
Sep 29, 2020
44
23
TEXAS
I have the FSD./MCU1.and it seems to work ok to me. Never had MCU 2 so can't compare. Screen is a little slow while recording but not worth $2500 and tax. When next year it will be time to trade in for the Plaid MS. Then u can get all the newest bells and whistles.
 
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hill

Active Member
Apr 21, 2015
1,311
659
Lake Forest, CA
when Tesla went from V8 to V9, that's when the real slow down happened imo. Likely brought about WAY more logging, which is the death knell to MCU1.
.
 

tranzndance

Member
Sep 10, 2017
490
320
Bay Area
My spouse wouldn't have accepted a car that had an MCU as slow as the one in my 2017. The MCU2 upgrade is noticeable to both of us. Now it works on the first tap.
 

AndrewTX

Member
Feb 15, 2017
203
158
Houston, Texas
when Tesla went from V8 to V9, that's when the real slow down happened imo. Likely brought about WAY more logging, which is the death knell to MCU1.
.

I agree with this. Mine came with the V8 software and that interface is still better than anything they’ve released since.
 

croman

Active Member
Nov 21, 2016
4,649
6,592
Chicago, IL
If you don't have mcu2, I'd worry about resale value. FSD visualizations keep diverging and likely to increase as time passes. Also features like bird's eye view and others are pretty sweet. It's just not about responsiveness, games and YouTube with mcu2.
 
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BigTonyTones

Member
Nov 28, 2016
629
521
Los Angeles
I think its too soon to tell. AP3 is useless for now. Dash cam and working sentry mode are nice I guess. I could do without them since I already have a dash cam running. They have both slowed my system down big time.

Well see what FSD really offers in the coming months. That $2k sale price may have been worth it. I am willing to upgrade my system to mcu2 but its still not available for my car.
 
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andrewkc

Member
Sep 21, 2016
14
15
Kansas
If you plan to keep mcu1, I would recommend not upgrading to HW3 for now. It was unbearably slow when I did this on my X and ended paying for MCU2 shortly after because it was almost unusable.
 
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AndrewTX

Member
Feb 15, 2017
203
158
Houston, Texas
I think its too soon to tell. AP3 is useless for now. Dash cam and working sentry mode are nice I guess. I could do without them since I already have a dash cam running. They have both slowed my system down big time.

Well see what FSD really offers in the coming months. That $2k sale price may have been worth it. I am willing to upgrade my system to mcu2 but its still not available for my car.

Why isn’t the MCU upgrade available for your car? You look to have one very similar to mine: AP2.0/MCU1.
 
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bob_p

Active Member
Apr 5, 2012
3,664
2,790
We have a 2017 S 100D with MCU1/HW3 and 2018 X 100D with MCU2/HW3.

The big difference between the two is that the X with MCU2 has more games and video streaming when parked - not supported with MCU1.

From a functionality standpoint, the two vehicles feel roughly the same, at least for normal operation - don't feel the S with MCU1 is any slower than the X with MCU2.

The major reason why we haven't upgraded our 2017 S to MCU2 is the lack of radio support. It's not clear what the impact of having MCU2 without any radio will have on resale value. It's possible MCU2-no radio might actually end up lowering resale value. How many vehicles on the market come with NO RADIO???

If Tesla adds radio as part of the Infotainment Upgrade, we'll consider upgrading our 2017 S - but until then, we're satisfied with running MCU1 with the HW3 FSD.
 
Apr 7, 2020
54
40
Houston
I have a 17 MS 75D and got AP3 hardware a month or so ago with MCU1. Yes MCU1 is slow, but it doesn't affect drivability or FSD use at this time. I don't get traffic cone images on the IC but the car seems to drives through them just like a MCU 2 car. Given how many times FSD has been put on sale I'm hoping for a MCU 2 sale one day.
 
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tranzndance

Member
Sep 10, 2017
490
320
Bay Area
The major reason why we haven't upgraded our 2017 S to MCU2 is the lack of radio support. It's not clear what the impact of having MCU2 without any radio will have on resale value. It's possible MCU2-no radio might actually end up lowering resale value. How many vehicles on the market come with NO RADIO???

If Tesla adds radio as part of the Infotainment Upgrade, we'll consider upgrading our 2017 S - but until then, we're satisfied with running MCU1 with the HW3 FSD.
No radio might hurt interest from people who care about radio, and MCU2 might help with interest from people who don't care about radio. My kids are too young to drive or buy a car. They grew up with streaming music and are used to on-demand requests, playlists, no ads, skipping songs, etc. There's no way that they would enjoy radio. Maybe they could make do with CDs/MP3. Their parents wouldn't want to go back to radio.
 

CaliMS

Member
Oct 8, 2017
141
97
CA
I wanted to take the pulse of the community on whether or not I should upgrade to AP3 without changing the MCU on my 2017 MS75 with AP2.0/MCU1.

I've already paid for FSD during the $2K sale last year and have a service appointment next week for the screen yellowing and some other issues. My service advisor noted that they've scheduled the AP3 upgrade at the same time, without my asking for it.
I've been hesitant to go for the MCU upgrade because I still actually listen to terrestrial radio and the stations I listen to are not on TuneIn. Plus, I would imagine that the lack of radio won't help resale value.

I've read as many of the threads as I can find about the MCU upgrade and how MCU1 interacts with AP3. But I'd really like to get a consensus from those who've gone through the process. Are you happy with your decision to keep MCU1 with AP3 or do you regret it? Are you now considering going forward with MCU2 because of the performance impact you've seen?

Thanks for sharing your experience.


Yes.
Did my AP3 upgrade, didn't opt to pay for MCU2. Should have. I'll correct this mistake at some point soon..
(it's slow, crashes at least 1x a week, cant really use the cam feature anymore)
 
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AndrewTX

Member
Feb 15, 2017
203
158
Houston, Texas
Yes.
Did my AP3 upgrade, didn't opt to pay for MCU2. Should have. I'll correct this mistake at some point soon..
(it's slow, crashes at least 1x a week, cant really use the cam feature anymore)

Have you determined that it's the dash cam feature which is causing the crashes? I don't think that is one that I'd use very often so it may not be a deal breaker for me.
 

trm2

Active Member
Apr 3, 2016
1,050
1,640
CLE
It is funny seeing the troubles some are having with the dash cam. Mine got better after (possibly/probably unrelated) after the FSD upgrade. I haven’t had problems with corrupted files si cle.
 

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