[Gizm0]

I found this formula online to calculate the air temperature coming out of a turbocharger:

Tout = Tin + [[Tin x (-1 + (Pout/Pin)^0.263)] / Eff]

* Tin = Inlet temperature in °R
* Tout = Outlet temperature in °R
* Pin = Inlet pressure (psia)
* Pout = Outlet pressure (psia)
* Eff = turbo efficiency (0 to 1)

Assuming an inlet temperature of 80°F and turbo efficiency of 70%, the outlet temperature of the turbo would be:

173°F @ 8psi boost
194°F @ 10psi boost (21°F hotter than stock boost)
211°F @ 12psi boost (38°F hotter than stock boost)
228°F @ 14psi boost (55°F hotter than stock boost)
245°F @ 16psi boost (72°F hotter than stock boost)
260°F @ 18psi boost (87°F hotter than stock boost)
275°F @ 20psi boost (102°F hotter than stock boost)

Hence the importance to upgrade the intercooler when running higher than stock boost.

These were done with the assumption that the turbos were 70% efficient, and I have no idea if this is correct. Do these numbers look right? Does anyone have actual data on the air temperature before the IC?

[Jeff@TopGearSolutions]

I wish someone would post some pre intercooler data the problem is someone needs to fit a probe and do some logging.

[E90Company]

Jeff got it right. ETS has some data you might want to check out, but I'm not entirely sure of their accuracy. (scroll down a bit).

http://www.extremeturbosystems.com/E...tercooler.html

[Gizm0]

Originally Posted by E90Company

Jeff got it right. ETS has some data you might want to check out, but I'm not entirely sure of their accuracy. (scroll down a bit).

http://www.extremeturbosystems.com/E...tercooler.html

Thanks man, that's some great data! It shows a max temperature of 249°F at the top of 4th gear boosting 12psi. I really need a better intercooler!

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