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Old 02-06-2004, 01:48 PM   #1
ezatnova
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Question TXS stage 2 Unichip vs Cobb Stage 2 Access ECU

Anyone made the switch or have experiences with the two?

I have the Unichip setup and it's OK, but I have occasional knock in cold weather despite the ABC being closed fully (running 16 psi). I also have the prerequisite hesitating acceleration and occasional P0420 codes.

Anyone ever get cold weather knock with the Cobb stage 2?

I imagine the power gain is not far off between the two, but is there a real difference? (It wouldn't be accurate to just compare the TXS web page dyno plots to those on the Cobb)

Thanks!
Jeff
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Old 02-06-2004, 04:29 PM   #2
KJR
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if you have the revision 3 board with the unichip then you need to see THIS . this will help with the low rpm hesitation. i have also heard of many people experiencing detonation with the Cobb stage 2 reflash. you can probably do a search and find some more info about that. i have a TXS stage 2 and am having it custom tuned for my extra mods. i have only experienced knock with it when i installed samco hoses with the stock IC. i installed a V2 txs tmic and it went away. gotta watch out for too much air=lean condition! (IE: open element intakes and high flow tubing).
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Old 02-06-2004, 04:44 PM   #3
ezatnova
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I waited for the Rev. 4 board so I could adjust where full boost hits. I have it way up around 65 - 75% throttle.
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Old 02-08-2004, 07:05 PM   #4
rotorbaru
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I have Cobb stage 2 and have not had any knocking in any weather, nor have I seen many posts about knocking and Cobb stg 2.
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Old 02-08-2004, 07:16 PM   #5
mouserWRX
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I believe the dyno that Cobb used dynoes pretty high, but I still think it's a great deal and you get some good gains from it.
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Old 02-09-2004, 09:40 AM   #6
ezatnova
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Turns out my knock was cured by some Sunoco 94. I'm almost leaning towards a bad batch of 93 Mobil gas as the problem. Hard to believe that if the 93 were fine, I'd have lots of repeatable knock, then NONE when I fill up 2/3 tank with one octane higher.

Anyway, on Mouser's note, I believe I remember Cobb mentioning that TXS tends to be overzealous with their dyno charts, which to me means they are more conservative.

I was hoping someone could chime in with direct experience going from a TXS S2 to a Cobb S2 as far as power. I have heard that teh Cobb is so much smoother (especially more than Unichip) that it FEELS slower because everyting is more progressive rather than an on/off boost feeling.
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Old 02-09-2004, 09:46 AM   #7
rotorbaru
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Quote:
Originally posted by ezatnova
Turns out my knock was cured by some Sunoco 94. I'm almost leaning towards a bad batch of 93 Mobil gas as the problem. Hard to believe that if the 93 were fine, I'd have lots of repeatable knock, then NONE when I fill up 2/3 tank with one octane higher.

Anyway, on Mouser's note, I believe I remember Cobb mentioning that TXS tends to be overzealous with their dyno charts, which to me means they are more conservative.

I was hoping someone could chime in with direct experience going from a TXS S2 to a Cobb S2 as far as power. I have heard that teh Cobb is so much smoother (especially more than Unichip) that it FEELS slower because everyting is more progressive rather than an on/off boost feeling.
Hello Ezatnova,
Your "bio" states you have a WRX with TXS stg2, is that still the case?
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Old 02-09-2004, 09:50 AM   #8
ezatnova
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Quote:
Originally posted by rotorbaru
Hello Ezatnova,
Your "bio" states you have a WRX with TXS stg2, is that still the case?
Yep.
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Old 02-09-2004, 09:54 AM   #9
rotorbaru
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Quote:
Originally posted by ezatnova
Yep.
I wish I could give you a better comparison between the TXS stg 2 and cobb stg2. I know my cobb stg 2 is very smooth and linear, which may make it appear to "feel" slower. I have never been in a TXS WRX to compare smoothness.
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