What does a PCM controller do ?

[99'EclipseGS]

my friend has been talking about replacing his pcm which will give him better boost and what not in first gear, my car isn't boosted yet but what would a pcm controller do for my motor n/a. i saw someone selling one on the marketplace and was wondering what it would do for my motor

 

[VelocitàPaola]

my friend has been talking about replacing his pcm which will give him better boost and what not in first gear, my car isn't boosted yet but what would a pcm controller do for my motor n/a. i saw someone selling one on the marketplace and was wondering what it would do for my motor

There are no "PCM controllers" for the 420A. If you see anything labeled a "performance chip" or "PCM enhancer," it's a scam.

There are only a few ways to adjust the PCM's signals, and those are:

• Piggyback devices like the S-AFC. They're okay, but aren't suited well for turbocharged applications, and you won't see many gains.
• A truly reprogrammed PCM, like the A/FX ECU from Howell. These will provide marked increases in performance, but there's no user adjustability, and Howell doesn't have a reputation for good customer service.
• A stand-alone engine controller, like Megasquirt. This is your best bet for full control over your engine. While installation is rather straightforward, tuning can be complicated if you don't know what you're doing.

 

[bullettdsm]

You know that PCM = ECU right? As Paul stated, you basically can't alter ours.

MB

 

[99'EclipseGS]

Oh wow. Okay thanks guys for everything, I was just looking at the marketplace and some guy was supposedly selling a PCM for the 420a and I thought I can use that for performance.
Thank you though for your explanation