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Author Topic: golf mk5 2.0tfsi downpipe changes  (Read 10805 times)
majorahole
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« on: May 23, 2013, 08:17:10 AM »

i ve got a downpipe on the way, and im wondering what changed can be made to my tune now.
just to BTS and thats it? or are there any other benefits of the downpipe? more boost?

thanks
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majorahole
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« Reply #1 on: May 23, 2013, 08:39:39 AM »

also because it is a cat-less dp, how do i keep my CEL from coming on? diable the rear O2 map?(all to 0?)
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k0mpresd
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« Reply #2 on: May 23, 2013, 09:45:11 AM »

cat delete is 1 byte.
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majorahole
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« Reply #3 on: May 23, 2013, 10:03:57 AM »

that should be easy to find  Roll Eyes
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k0mpresd
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« Reply #4 on: May 23, 2013, 10:39:38 AM »

not any harder than me7.
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majorahole
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« Reply #5 on: May 23, 2013, 10:56:55 AM »

never worked with me7, but ill worry about that later.
do most disable bts altogether? or just up the EGT threshold?
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prj
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« Reply #6 on: May 23, 2013, 03:24:41 PM »

Why would you touch BTS?
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airtite
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« Reply #7 on: May 23, 2013, 11:24:43 PM »

http://nefariousmotorsports.com/forum/index.php?topic=3104.msg31288#msg31288
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majorahole
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« Reply #8 on: May 24, 2013, 07:11:07 AM »


dang, i was hoping yours was 115b or h! that would have been easy! oh well, ill just have to figure  it out.
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majorahole
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« Reply #9 on: May 24, 2013, 07:14:48 AM »

Why would you touch BTS?

because the egt modeling would be off, right?? thats what ive found when searching, that once you have downpipe, you can disable BTS, or just raise the BTS EGT threshold to where it wont interfere.
is this incorrect?
so what are the benefits then, besides a slightly quicker spool up? holding more boost longer in RPM range??
 
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prj
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« Reply #10 on: May 24, 2013, 07:23:12 AM »

because the egt modeling would be off, right?? thats what ive found when searching, that once you have downpipe, you can disable BTS, or just raise the BTS EGT threshold to where it wont interfere.
is this incorrect?
so what are the benefits then, besides a slightly quicker spool up? holding more boost longer in RPM range??

I do not think you understand in the slightest what BTS is there for.
It is component protection. It works by adding fuel to cool down the combustion temperature.

You have removed the CAT, but removing BTS and relying only on ATR (if ATR is even active) will result in cracked exhaust manifolds and failed turbos.

I think you should better educate yourself on the function of the internal combustion engine, so that you can make informed decisions and understand what every module is there for.
Even reading Funktionsrahmen about this function tells a great deal as to why it is there.
« Last Edit: May 24, 2013, 07:25:49 AM by prj » Logged

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majorahole
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« Reply #11 on: May 24, 2013, 07:28:41 AM »

i understand why it is there.
but wont it be adding fuel for no reason?
if it thinks my EGT is 900deg and its really 700deg, im wasting fuel, and loosing performance right??
obviously other changes would need to be made for correct fueling, i assumed scaling lamfa load and using it would be sufficient? no?
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prj
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« Reply #12 on: May 24, 2013, 07:29:50 AM »

Why do you think that your EGT magically fell by 200 degrees after removing the CAT?

I don't see how LAMFA is sufficient when you are not driving at WOT all the time.
You do realize if you try to do lambda 1 on part throttle all the time, you are easily going to hit EGT limits?
« Last Edit: May 24, 2013, 07:31:58 AM by prj » Logged

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majorahole
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« Reply #13 on: May 24, 2013, 07:53:16 AM »

Why do you think that your EGT magically fell by 200 degrees after removing the CAT?

I don't see how LAMFA is sufficient when you are not driving at WOT all the time.
You do realize if you try to do lambda 1 on part throttle all the time, you are easily going to hit EGT limits?

those temps were an example...
i was under the impression that med9 LAMFA was 50-100% not like me7, please correct me if im wrong.
or just tell what changes you might make if im going about this wrong?

thanks for any suggestions
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fredrik_a
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« Reply #14 on: May 25, 2013, 01:10:31 PM »

I don't really understand the question...? Just fit an EGT probe in your turbine housing (right after the exhaust manifold, entering the turbine) and see what you make of it.
If you can see that (using either logging of fuel or using a wide band lambda sensor) the car starts to heavily ad fuel before it even starts to get warm, then it's time to adjust.
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