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Old 06-18-2011, 02:18 AM   #29
wutsupdoc
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All those graphs remind me of when I used to get high and go to math class in 10th grade lol.
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Old 06-19-2011, 09:20 PM   #30
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Will do. I'm just going to need Boost graphs and MAF graphs for every company
Here is an APR K04 boost plot and you already have one for their K03 software.

Does anyone have GIAC numbers?

You should be able to estimate airflow based on boost, right?

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Old 06-20-2011, 08:05 AM   #31
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Here is an APR K04 boost plot and you already have one for their K03 software.

Does anyone have GIAC numbers?

You should be able to estimate airflow based on boost, right?

Since its a independent variable across the compressor map, no. There are MANY other factors that contribute to MAF readings. Anyone can produce boost graphs. I'm looking for people to post MAF across the RPM range.
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Old 06-20-2011, 08:08 PM   #32
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Since its a independent variable across the compressor map, no. There are MANY other factors that contribute to MAF readings. Anyone can produce boost graphs. I'm looking for people to post MAF across the RPM range.
Have you read the Turbo Tech section on Garrett's site? It says that the MAF can be estimated.

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Mass Flow Rate is the mass of air flowing through a compressor (and engine!) over a given period of time and is commonly expressed as lb/min (pounds per minute). Mass flow can be physically measured, but in many cases it is sufficient to estimate the mass flow for choosing the proper turbo.
http://www.turbobygarrett.com/turbob...o_tech103.html
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Old 06-20-2011, 09:27 PM   #33
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Have you read the Turbo Tech section on Garrett's site? It says that the MAF can be estimated.



http://www.turbobygarrett.com/turbob...o_tech103.html
I have read through that bit plenty of times. And frankly, estimates are not the way to go. Plus there are too many variable factors here that can be twisted into making the results you want. Providing actual data through the MAF would be a better sense of plotting across the MAP
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Old 06-21-2011, 02:46 AM   #34
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So basically the downpipe is the most important mod.
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Old 06-21-2011, 08:39 AM   #35
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So basically the downpipe is the most important mod.
No, its just one of the main factors in this discussion, but the main reason is the K03 turbocharger is too small and thats why the power falls short around 5500RPM

I would never say any mod is "the most important".
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Old 06-21-2011, 09:46 AM   #36
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Being a former Subaru owner, I know all too well how IHI turbo's fall flat on their face at high revs
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Old 08-17-2011, 10:04 AM   #37
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bump
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Old 08-17-2011, 10:12 AM   #38
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Old 08-17-2011, 10:46 AM   #39
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But why didn't VAG just put a k04 in the TSI in the first place? Is it all about emissions, or does it have to do with the longevity of the engine?

Also, does the OEM downpipe on the k03 allow for it to maintain pressure without "running out of breath"?

I'd love to go straight to k04 with all the requisite upgrades, but ultimately I'm concerned about my car going 150,000 miles.
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Old 08-17-2011, 10:55 AM   #40
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Cost? OEMs don't make cars as good as they can be, they make them as good as it can be at a price point/profit margin.
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Old 08-17-2011, 10:56 AM   #41
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But why didn't VAG just put a k04 in the TSI in the first place? Is it all about emissions, or does it have to do with the longevity of the engine?

Also, does the OEM downpipe on the k03 allow for it to maintain pressure without "running out of breath"?

I'd love to go straight to k04 with all the requisite upgrades, but ultimately I'm concerned about my car going 150,000 miles.
i) Product differentiation. Audi's > VW's, or so they want you to think.
ii) There are gains with a K03 and a DP, so it looks like the stock DP is restrictive.
iii) It's an OE upgrade, I would not worry about it.
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Old 08-17-2011, 10:58 AM   #42
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Cost? OEMs don't make cars as good as they can be, they make them as good as it can be at a price point/profit margin.
This is the damn truth. The current project I'm working on now is trying to stray away from this idea, yet its too good not too.

The fact that EVERY VW turbo engine uses the IHI/K03 compressor saves quite a bit a money. To manufacture one engine with a K04, would definitely raise the price of said vehicle, IE Golf R.

You also got to consider markets of various vehicles in the lineup. You dont want it stepping on the toes of another, or otherwise you've developed a car that wont sell, and ultimately your initial investments wont be paid.
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