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Old 12-22-2011, 02:41 PM   #1
DonnieD
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Default Second ECM To Hide Mods

WARNING: The thread you are about to read is pointless. To sum it up: It is a bad idea to buy a second ECM and flash it to Stage 1. The dealer will know.


Hello,

Quick question that must have been asked 1,000 times because it seems so obvious except I can't find any good results from searching.

Here we go:

If you buy a second ECM, flash it with Cobb AP or whichever, and swap back to your stock ECM when you take the car in for service.. will the dealer be unaware?

Specifically, this would be for a 2012 WRX, if that matters.

I feel dumb for asking because it is just way too obvious. No one seems to be doing it, though, so I assume it doesn't work like I suggested...

*Flame suit on*
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Last edited by DonnieD; 12-22-2011 at 02:54 PM.
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Old 12-22-2011, 02:43 PM   #2
blame
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well besides the cost of a new ECM, and the fact that you'd be running mods un-tuned when you have the stock ECM in place, it would work

it's kinda dumb though. for both reasons listed.

-sean
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Old 12-22-2011, 02:45 PM   #3
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the dealership would have to program that ecu to your car, they would know you have 2 and i believe mileage is stored on it. you switch to one without correct mileage and your ENTIRE warranty will be voided. no if's and's or but's.

you pay to play. don't try to scam subaru. there's plenty of subaru reps that are active here, you wouldn't get away with it.
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Old 12-22-2011, 02:46 PM   #4
DonnieD
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Sorry, should have been more specific. This would be only if you keep the car Stage 1. Anything beyond that would definitely be a bad idea.

The cost of a new ECM > warranty denied due to mods
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Old 12-22-2011, 02:48 PM   #5
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Quote:
Originally Posted by drewvdw View Post
the dealership would have to program that ecu to your car, they would know you have 2 and i believe mileage is stored on it. you switch to one without correct mileage and your ENTIRE warranty will be voided. no if's and's or but's.

you pay to play. don't try to scam subaru. there's plenty of subaru reps that are active here, you wouldn't get away with it.
Thanks for the info. Try not to take my words offensively. Just asking a simple question.
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Old 12-22-2011, 02:54 PM   #6
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Quote:
Can the dealer detect my reflashed ECU (AccessPort/EcuTek/Open Source)?

YES the checksum of the ECU changes.
YES the dealer can easily read the checksum.

NO the dealer has nothing to compare the checksum against there are many revisions of the WRX ecu they all have different checksums. If the dealer had someway of putting this checksum into a database he COULD verify that the code had been modified but at this time he doesn't.

The 05+ ECU and some of the 04s have the VIN in the ECU code. The current versions of reflashed ECUs only change the tables so the VIN will report when queried.

Bottom line: If you don't want modifications to be detected, don't modify the car.
http://forums.nasioc.com/forums/showthread.php?t=795608
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Old 12-22-2011, 02:55 PM   #7
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if that were the case, you could just flash the stock map back on when you take the car in, then flash stg1 again after, no?

-sean
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Old 12-22-2011, 03:00 PM   #8
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Quote:
Originally Posted by blame View Post
if that were the case, you could just flash the stock map back on when you take the car in, then flash stg1 again after, no?

-sean
Not sure if you're replying to me but the big debate is whether or not the dealer can detect if the ECM had been flashed. My idea of switching out ECM's would keep the stock ECM a "virgin", so to speak.
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Old 12-22-2011, 03:01 PM   #9
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no. they know if the ecu has been modified.
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Old 12-22-2011, 03:05 PM   #10
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Quote:
Originally Posted by drewvdw View Post
no. they know if the ecu has been modified.
And this is how the big debate begins...

You say No...
Someone else chimes in saying Yes...
Someone else says No, my buddy works at a dealer and he told me...
Someone else says Well, I spoke with Tuner X and they said Yes...
AND SO ON................
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Old 12-22-2011, 03:07 PM   #11
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^^ well all anyone has to go on is what they've heard. if you are gonna get mad about people having different opinions, try it and find out

-sean
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Old 12-22-2011, 03:10 PM   #12
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Originally Posted by blame View Post
^^ well all anyone has to go on is what they've heard. if you are gonna get mad about people having different opinions, try it and find out

-sean
Again, not sure who you're replying to. Does the ^^ mean two posts above?

Anyway, if directed toward me: I am definitely not upset. I just wish there was a concrete answer. Oh well, gotta learn to love stock until the warranty is up.
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Old 12-22-2011, 03:12 PM   #13
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Not sure if trolling...
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Old 12-22-2011, 03:14 PM   #14
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Not sure why I decided to start this thread...
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Old 12-22-2011, 03:51 PM   #15
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me either

-sean
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Old 12-22-2011, 03:54 PM   #16
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IBSORRYIWASDRUNK
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Old 12-22-2011, 03:56 PM   #17
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Quote:
Originally Posted by DonnieD View Post
WARNING: The thread you are about to read is pointless. To sum it up: It is a bad idea to buy a second ECM and flash it to Stage 1. The dealer will know.
Sounds like someone who tried, and got caught.
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Old 12-22-2011, 03:56 PM   #18
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Quote:
Originally Posted by DonnieD View Post
WARNING: The thread you are about to read is pointless. To sum it up: It is a bad idea to buy a second ECM and flash it to Stage 1. The dealer will know.
You're learning. That's a good thing.
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Old 12-22-2011, 05:22 PM   #19
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Originally Posted by v8subie View Post
You're learning. That's a good thing.
Yep, exactly.

I am coming from the VAG scene. I swapped my B5 S4's ECU for a chipped ECU (as opposed to shipping it to a tuner) and it was just plug & play. I shouldn't have assumed it would be so easy with a different platform. But you're right, I'm learning. If only you could delete threads you started.
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Old 12-22-2011, 05:29 PM   #20
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Old 12-22-2011, 05:30 PM   #21
drewvdw
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ask jack to close it
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Old 12-22-2011, 05:33 PM   #22
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In an ideal world we would all be rich and whatever broke we would have replaced and upgraded out of pocket....warranty shmarrenty
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Old 12-23-2011, 08:36 AM   #23
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Originally Posted by OneBadPig View Post
In an ideal world we would all be rich and whatever broke we would have replaced and upgraded out of pocket....warranty shmarrenty
Wouldn't that be "In an Honest World"? I have been Stage 1 (Cobb AP) in all 3 of my WRXs and have been upfront with the dealer. Hell, they have pictures of me on the racetrack and autocrossing. Except for a transmission problem I had with a 2.5rs(that was autocrossed) I have had no major problems. Small warranty problems have never been questioned. They have also given me top dollar on my trade-ins.
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