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Old 03-08-2008, 10:21 AM   #1
Brock31
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Default T-Flip Mod.

Anyone ever heard of this. It is supposedly a way to use the stock BCS and get it to hold boost a little longer/consistently by switching the orientation of the vacuum lines that feed into the BCS. I know this sounds pretty vague, but I heard about it a while ago and wanted to know if anybody had tried it?
This is not the same as removing the restrictor pill, or the 3/16th-T mod.
I have tightened my WG actuator arm quite a bit already.
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Old 03-08-2008, 11:39 AM   #2
03WRX-WRB
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yup it works i use it on my car, i run 21 PSI with out any problems and my WGDC (wastegate duty cycle) is only set to 70 percent, but if you do the T flip you are going to have to adjust your WGDC, because you are probably running 85 percent on your car or more to get target boost

so yes it works do it and adjust your wastegate duty and be goood to go
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Old 03-08-2008, 11:49 AM   #3
Brock31
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Thats what I'm talking about.
Right not I'm close to maxing my WGDC's 95-98% at max boost, which is only about 16 psi. on the TDO4.
I had somebody tell me how to do it, but I forgot to write it down
Which lines do I switch? And yes, I'll edit my current map and lower my WCDC's and work from there.
Any long term issues you've run into?
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Old 03-08-2008, 07:25 PM   #4
Arctic Penguin
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i know some who have put a bleed type mbc in the line that makes the long leg of the 'T' to the stock bcs

seems to work fine once ya get it adjusted
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Old 03-09-2008, 12:57 AM   #5
03WRX-WRB
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ok you have 3 lines the compressor side, wastegate side, and BCS.

the compressor and wastegate are in line with each other and the BCS comes off at the T you need to make the BCS and compressor inline with each other so the straight part of the the T

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Old 03-09-2008, 01:52 AM   #6
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what does this mod do?? Make more boost or change the WG duty cycle?? Whats that??
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Old 03-09-2008, 09:55 AM   #7
Brock31
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This mod allows the stock BCS to hold more boost, more consistently while using lower WGDC's. (Wastegate Duty Cycles)

03WRX-WRB-- thanks for the great pic.!
I knew what lines needed to be re-oriented, I just wasn't sure which ones went where.
Now I know.
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Old 03-09-2008, 01:32 PM   #8
03WRX-WRB
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anytime man have fun...

and yes this mod allows mosr boost out of the stock BCS some people cant hold more than 18 psi so by doing this mod is allows you to run 22 psi or a bit more instead of doing the GM BCS it works the same. but the GM is a 3 port and you have to tune for that as well.

easy mod to do try it if you know how to adjust your WGDC
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Old 03-28-2008, 11:12 AM   #9
Brock31
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Bumping my own thread

The issue I am experiencing is a substantial boost spike to around 19 psi. This isn't crazy high, but its higher than I feel comfortable with on the TD04. I don't want to blow the turbo seals or blow up anything else for that matter.

Has anyone elso tried this mod.? If I continue to revise (lower) my max WGDC table at WOT would I be able to reduce the boost spike? Should I loosen my WG arm? Are there other parameters I should alter? (ie. Turbo Dynamics (TD) integral gain, TD proportional gain, or the WG compensation tables)?
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Old 03-28-2008, 11:44 AM   #10
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Default Tmod

You need to tune for it. multiply you WGDC by .75 should get you pretty close you need to also adjust your target boosts. I've tuned a few cars with the t-flip. I ran 18psi on my td04 all day long.
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Old 03-28-2008, 11:53 AM   #11
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Quote:
Originally Posted by thorne View Post
You need to tune for it. multiply you WGDC by .75 should get you pretty close you need to also adjust your target boosts. I've tuned a few cars with the t-flip. I ran 18psi on my td04 all day long.
The problem I'm having isn't getting a high enough boost, its the fact that I'm spiking to over 19psi. Right now my max WGDC's are at least 75% lower that my max WGDC's before I did the mod.
Basically what I did was reflash my map with one where I lowered my max WGDC's to about half where they were before. I didn't adjust anything else (target boost, TD gains, WG compensation etc..) I then flipped the lines to the BCS, WG and inlet.
My first pull showed low boost as expected. I then increased my WGDC's incrementally, logging after each reflash until I was getting the boost I was looking for. All I really wanted was solid 17.5-18 psi, which I am getting, its just the spike I'm worried about.
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Old 03-28-2008, 09:57 PM   #12
Brock31
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anybody else?
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Old 03-28-2008, 10:43 PM   #13
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Quote:
Originally Posted by Brock31 View Post
Bumping my own thread

The issue I am experiencing is a substantial boost spike to around 19 psi. This isn't crazy high, but its higher than I feel comfortable with on the TD04. I don't want to blow the turbo seals or blow up anything else for that matter.

Has anyone elso tried this mod.? If I continue to revise (lower) my max WGDC table at WOT would I be able to reduce the boost spike? Should I loosen my WG arm? Are there other parameters I should alter? (ie. Turbo Dynamics (TD) integral gain, TD proportional gain, or the WG compensation tables)?
i have run my td04 to 20-21psi daily for over a year

still going strong

and i consider the td04 a disposable item anyway
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Old 03-03-2009, 08:43 PM   #14
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I'll resurect this tread.

I'm running prodrive stage 3, which is supposed to run 19 PSI on the TD-04. The difference is that a different restrictor pill is used.
I was seeing 16.8 PSI in third gear, so I adjusted the actuator arm (I had left it at the point of zero closed tension before) and now I'm seeing 18.4 PSI in 4th.
However, my duty cycles went from 47% at 16.8 PSI (then gradually tapering down to 37.6% as the boost was slightly tapering at around 4500rpm) to stable 46.3%, no tapering, as the boost was holding above 18 PSI, maxing at 18.4

You guys may need a different pill to extend the life of your BCS.

I have a related question. I've got 117 K miles on the stock turbo, new BCS (the old was fine, I did preventative maintenance).
The boost for me climbs kinda slow:
15.5 PSI @ 3100 rpm
17.1 PSI @ 3200
18 @ 3300
18.4 @ 3780

I mean, the TD04 should be spooled up by 3000 rpm, no?
What kind of RPM are people needing to hit 19-21 PSI for the TD-04?
Assume standard load, (flat road, 1 person, 4th gear).
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Old 03-03-2009, 09:12 PM   #15
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i hit full boost in 3rd just before 3000 rpm on a td04. raise your initial WGDC and change WGDC accordingly. then log your boost error and see if youre calling for too much or too little and adjust again.
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Old 03-03-2009, 09:37 PM   #16
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Thanks.
So you're hitting 19 before 3000?
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Old 03-03-2009, 09:45 PM   #17
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my target is 18.5 but yes
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