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How to tell if ECU is tuned?

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How to tell if ECU is tuned?

 
Old 06-01-2018, 01:48 PM
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E55, 2002 | E550 2014
How to tell if ECU is tuned?

I just bought 2014 E550 and considering ECU tune (Weistec?). Well, I checked their instructions... They said send us your current ECU, but it has to have stock tuning. So my question is how to tell if I have stock tune? I bought the car from used car dealer, and sure they do not know about it.
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Old 06-01-2018, 01:54 PM
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Put it on a dyno. Or send the ECU and when they crack it they will know and send it back.
tuning so soon? Lol
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Old 06-01-2018, 02:54 PM
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I thought easier way and that time consuming.
Why wait before tuning?
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Old 06-01-2018, 03:16 PM
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you can call each of the big name vendors with your vin and see if its in the database.
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Old 06-02-2018, 12:49 AM
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Hypothetically, One way to tell is if your car goes above 133MPH. That's the stock speed limiter, and tuners always increase the speed limiter.

Last edited by bob2011; 06-02-2018 at 04:09 PM.
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Old 06-02-2018, 09:40 AM
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We talk about tuning here, but it is not the norm. My guess is that for every ECU-tuned car out there, there are 5,000+ other cars with factory tunes. So you can play the odds. Unless you know the previous owner to be a tuner type, I would assume the car is not tuned.
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Old 06-02-2018, 02:44 PM
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Originally Posted by DFWdude View Post
We talk about tuning here, but it is not the norm. My guess is that for every ECU-tuned car out there, there are 5,000+ other cars with factory tunes. So you can play the odds. Unless you know the previous owner to be a tuner type, I would assume the car is not tuned.
good assumption
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Old 06-03-2018, 12:03 AM
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2014 E550 4MATIC TUNED - Turbo Upgraded Stage 3
Two ways to find out.

1. See if you can open your ECU. You will have to unscrew 7 screws.
Then, open it. If you cant open it. Mostly likely, its untouched.
ECU typically is sealed by those black colour silicone. See 2nd picture.

Inside the ECU, there are 3 screws need to be taken out. After that, see if you can take off PCB board out of metal plate.
If the PCB board can be taken off the metal plate. Which mean its been taken out for tuning.
But some tuners can access boot pin from top of PCB board.









2. See if there is a small drill patched mark in this area.


3. Go Race with stock E550, see if you can out run it.









.

Last edited by cocobeex; 06-03-2018 at 12:24 AM.
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