Stage 2 Within an OEM TD04 turbo's Efficiency Range?

[LaszloT]

I asked COBB about the stock turbo's efficiency with Stage 2 power:

"With Stage 2's 16.5 psi boost (plus 14.7 atmosphere) is a 2.12 pressure ratio, and air flow rate is estimated to be at 017 m^3/sec from the How to Read Compressor Map link below.

How to Read Compressor Map:

http://www.cicenet.net/showthread.php?t=1019

Is the OEM TD04-13T turbo approaching it's efficiency range in a standard Stage 2 application, or operating beyond it?

I know less efficiency means more heat, and I suspect COBB would've designed Stage 2 to be within a practical operating range of the OEM turbo.
Any insight you have would be helpful.

Thanks,

Laszlo Toth, P.Eng. | Associate Manager, Fuel Pricing & Rewards | Fuels Marketing |



"


And they say that with their maps boost tapers off in the upper rpm range intentially, because of efficiency.

"John (COBB Support)

Sep 12 04:02 PM

Hello Laszlo,

This is the main reason we design our maps to taper down towards redline to prevent the turbo from becoming a heat pump. You will still be good on our OTS maps.

Here is a good link. http://www.turbobygarrett.com/turbob...ompressor_maps

Please let us know if you have any other questions.
Thank you,


John
ph: 866-922-3059

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