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Old 03-28-2001, 11:31 PM   #1
RebelINS
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Member#: 2953
Join Date: Nov 2000
Chapter/Region: MWSOC
Location: Rochester, MI, USA
Vehicle:
2000 Impreza 2.5RS
2005 Impreza WRX STi

Post What does the JCS TCII do?

What exactly does the JC Sports TCII do? It is hard for me to rationalize buying something for $250, that I don't know how it works. Their website doesn't explain it at all. Also if I new how it worked, it might be possible to make something similar for a lot less. How it works, or any ideas on how to create a similar product would be helpful.
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Old 03-29-2001, 07:13 AM   #2
SteveS
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Member#: 6
Join Date: Jun 1999
Location: South Jersey
Vehicle:
2013 BMW M3 Coupe
Interlagos Blue

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The only thing it has actually been documented to do is lighten your wallet.

Steve
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Old 03-29-2001, 07:39 AM   #3
wac
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Join Date: Dec 1999
Chapter/Region: NESIC
Location: Lebanon, NH, USA
Vehicle:
2005 Outback 2.5 XT
Champagne Gold Opal

Post

From all the snippets of info I've read, one of its tricks has to do with the coolant temp sensor readings.

The ECU is programmed to run a bit rich when the engine is cold, and so the TCII fools the ECU to run richer than it would normally, even when warmed up. This trick is mentioned in Corky Bell's book "Maximum Boost".

I think it also does something with the MAP sensor readings.

JCS posted a money-back satisfaction guarantee on the TCII a few months back, but I wasn't very confident that they'd honor it. Besides, my car is MAF-based. Whether it works (power-wise) or not, I was interested in figuring out how it works and publishing my findings on my website, similar to what I did with my S-AFC.

-WaC
Wayne
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Old 03-29-2001, 08:09 AM   #4
STiShawn
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2006 WRX TR
Steel Grey Metallic

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Steve S LMAO!
You beat me to the punch...
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Old 03-29-2001, 03:53 PM   #5
Eric Gagnon
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Join Date: Jun 1999
Location: Saratoga Springs, NY
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2001 Jetta 1.8T
White

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It is kinda like "How many licks does it take to get to the center of a Tootsie Pop?"

--Answer: No one will ever really know.--

Eric
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