I'll just leave this here:
[QUOTE=mainstayinc]I thought I would post my response to an IM I recieved here in this thread instead of the [url="http://forums.vwvortex.com/forumdisplay.php?568-Inline-5-10v-20v-Engine-Forum"]Inline-5 20v & 20v Engine[/url] Forum which has not had any activity in over two months (see below).
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Here are the engine specs for the 20V 5 cylinder:
Bore: 82.5mm
Stroke: 86.4mm
Cylinders: 5
Displacement: 2309.3cc
Here is the Garrett GTX3576R overlaid with 2309 cc's:
As you can see, the GTX3576R is capable of close to 650 HP, with peak power occuring at about 6200 RPMs and 31.85 psi (P2/P1=3.167). The surge line for this combination ranges from about 2000 RPMs at lower boost pressure all the way above 3600 RPMs. This setup would provide a fairly responsive turbo at 2.3L similar to what you might expect from a GT3071R on 1.8L (if that means anything to you).
Below is the GTX3582R overlaid with 2309 cc's:
The GTX3582R is capable of over 750 HP with peak power at 2.3L occuring at 8200+ RPMs and 27 psi (P2/P1=2.83). However, at 2.3L, the GTX3582R leaves too much on the table with a substantial part of the map laying above 8000 RPMs and peak efficiency (dotted line in center of map) mostly occuring above 6000 RPMs. I would not recommend this turbo unless you plan to rev the 20V 5 cylinder above 9000 RPMs. In that case, the GTX3582R would be a better match.
Below is the GTX3576R and GTX3582R overlaid for comparison:
Below is the Holset Super HX40 and the GTX3582R overlaid with 2.3L for comparison.
As you can see, the Holset is capable of close to 900 HP with peak power occuring at 8400+ RPMs and 32 psi (P2/P1=3.186). The Holset has a better surge line as compared to the GTX3582R by several hundred RPMs. That means that this turbo will begin to produce good airflow sooner and likely come into boost quicker. It also has more total corrected airflow as compared to the GTX which makes it a better choice for a higher reving application. I wouldn't recommend this turbo unless you plan to rev. to at least 8500 RPMs.
I could not find a compressor map for the HTA or PTE turbos. However, you may want to consider the BW EFR8374. Below is the EFR8374 overlaid with 2.3L:
The BW EFR8374 is capable of close to 800 HP with peak power occuring at about 8000 RPMs and 29.4 psi (P2/P1=3) with a surge line ranging from 2500 to 3500 RPMs at 2.3L. This would be a nice combination for a higher-reving application.
Below is the BW EFR8374 and GTX3582R overlaid with 2.3L for comparison:
As you can see, the BW has a slight advantage in terms of surge line and total corrected air flow which would make it a better choice over the GTX3582R in this HP range.
I hope this analysis helps![/QUOTE]
The 2nd turbo will be on for next years event.
