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Old 02-03-2013, 03:48 PM   #1
mhs5074
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Default Switching to catless w/o tune?

So last summer I had my car pro tuned at Akuma. The tune was for a stage 2 2006 sti running on the Cobb AP with an Invidia n1 race cat back, a Perrin single piece catted divorced DP, Perrin SR intake, Perrin inlet hose, DW 300 fuel pump, and an Invidia catless up pipe.

Would switching to an invidia catless down pipe without getting the car retuned on a dyno give me any legitimate problems to worry about?

Could I just reflash the ECU to the map given to me by Akuma after I install the catless DP? I assume that would re calibrate the car's computer to accommodate for the change in air flow.

Any help is greatly appreciated!
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Old 02-03-2013, 03:53 PM   #2
turboedracer
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ran my 06 sti with catless tbe for 2 years without a tune with no problems at all but rarely got on it hard. But that was the only "power" mod I had
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Old 02-03-2013, 04:02 PM   #3
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My opinion is that it's safer to get it retuned. You do not want to be running too rich- which may decrease the longevity of your car (along with several other problems), and also you will get a legit boost of power out of a dp + retune.

If you can afford it, you should definitely go for it. I personally would not put in a downpipe without a tune.
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Old 02-03-2013, 04:25 PM   #4
mhs5074
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Well I already have a Perrin catted downpipe installed and it was tuned for it. I'm asking if it would be problematic if I just switched out that downpipe for catless one..
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Old 02-03-2013, 04:55 PM   #5
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Call Akuma. They will know.
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Old 02-03-2013, 04:59 PM   #6
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Call Akuma on tuesday and talk to John, their closed tomorrow I'm pretty sure
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Old 02-03-2013, 06:09 PM   #7
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You will be fine, but call your tuner to verify. Internet warriors won't make a difference.
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Old 02-03-2013, 08:31 PM   #8
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I dont think it will be a huge difference but you will throw a cel without a tune.
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Old 02-04-2013, 01:55 AM   #9
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Quote:
Originally Posted by rudymcskoody View Post
I dont think it will be a huge difference but you will throw a cel without a tune.
Not if he spaces the O2 sensor he wont.
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Old 02-04-2013, 07:26 AM   #10
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Or if his P0420 is already shut off from the previous tune.

A high flow cat will likely still trigger the P0420 if its not fooled somehow.

You're also not going to gain anything going from a high flow catted downpipe to a catless one. 3-5hp if you're lucky. Not worth the time and effort IMO.
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Old 02-04-2013, 08:36 AM   #11
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Quote:
Originally Posted by vision.dynamix View Post
Or if his P0420 is already shut off from the previous tune.

A high flow cat will likely still trigger the P0420 if its not fooled somehow.

You're also not going to gain anything going from a high flow catted downpipe to a catless one. 3-5hp if you're lucky. Not worth the time and effort IMO.
Yes I agree but since the catted downpipe is worth about $100-200 more than a catless one, I have good reason to put in the effort and squeeze a couple more ponies out of her. And besides, shooting fireballs is a lot more fun too.
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Old 02-04-2013, 08:46 AM   #12
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Well luckily it doesn't work that way.
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Old 02-04-2013, 08:52 AM   #13
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Quote:
Originally Posted by rudymcskoody View Post
I dont think it will be a huge difference but you will throw a cel without a tune.
Not always. Mine didn't, no spacer present, P0420 still active in the ECU.
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Old 02-23-2013, 07:37 PM   #14
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would changing out my stock turbo on my 06 sti with a bolt on turbo stop boost creep? im new to this site and have no clue how to navigate it. im so sorry guys.
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Old 02-23-2013, 07:38 PM   #15
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Quote:
Originally Posted by sti_luv_06 View Post
would changing out my stock turbo on my 06 sti with a bolt on turbo stop boost creep? im new to this site and have no clue how to navigate it. im so sorry guys.
No it wouldn't. At all.
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Old 02-23-2013, 09:05 PM   #16
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Quote:
Originally Posted by sti_luv_06 View Post
would changing out my stock turbo on my 06 sti with a bolt on turbo stop boost creep? im new to this site and have no clue how to navigate it. im so sorry guys.
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Old 02-24-2013, 04:41 PM   #17
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Originally Posted by sti_luv_06 View Post
im new ... and have no clue
Fixed.

You seriously need to read, and learn. Definitely use "search".
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Old 02-24-2013, 04:53 PM   #18
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Quote:
Originally Posted by sti_luv_06 View Post
would changing out my stock turbo on my 06 sti with a bolt on turbo stop boost creep? im new to this site and have no clue how to navigate it. im so sorry guys.
This thread wasn't very fun.

Then I saw this.
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Old 02-24-2013, 11:47 PM   #19
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Quote:
Originally Posted by turboedracer View Post
ran my 06 sti with catless tbe for 2 years without a tune with no problems at all but rarely got on it hard. But that was the only "power" mod I had
That's not what he was asking. He's already tuned with catted and wants to go catless.

My first thought would be you may overboost? But I really don't know much. You're going to be changing your back pressure (freeing up flow) which can affect your boost.
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Old 02-25-2013, 12:40 PM   #20
rich260z
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Why can't/don't you want to retune?
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Old 02-25-2013, 02:01 PM   #21
sti_luv_06
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I have a catless dp already, my question was if I buy a bigger turbo(because I'm going to anyway) say a td05. Would it stop boost creep.
Rather then me taking off my stock port the waste gate then putting it back on.
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Old 02-25-2013, 02:14 PM   #22
Psychoreo
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Quote:
Originally Posted by sti_luv_06 View Post
I have a catless dp already, my question was if I buy a bigger turbo(because I'm going to anyway) say a td05. Would it stop boost creep.
Rather then me taking off my stock port the waste gate then putting it back on.
No. That's not how it works.
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Old 02-25-2013, 02:30 PM   #23
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Originally Posted by rich260z View Post
Why can't/don't you want to retune?
$$$$$
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Old 02-25-2013, 02:40 PM   #24
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I would say retune, you never want to take any risks and blow every pay check on a new engine
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Old 02-25-2013, 03:07 PM   #25
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Quote:
Originally Posted by sti_luv_06 View Post
I have a catless dp already, my question was if I buy a bigger turbo(because I'm going to anyway) say a td05. Would it stop boost creep.
Rather then me taking off my stock port the waste gate then putting it back on.
If you don't understand how these parts work, why are you even looking at them?

Fact is, you most likely aren't even experiencing boost creep.

Stop looking at parts. If you think something is wrong with the car, take it to someone.
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