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Forester XT torque curve

 
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      08-10-2003
In the middle of April, when there were many questions about the
performance and power of the Forester XT, I made an educated guess about
its torque curve. Here is what I wrote then, with Nm quantities
included now for convenience:

RPM lb-ft Nm
1600 ~160 217 [from base 2.5l engine +AVCS +turbo]
2000 ~190 258 [from base 2.5l engine +AVCS +turbo]
3600 ~235 319 [official spec]
4600 ~220 298 [interpolated]
5600 ~200 271 [official spec, converted from max hp (197, exactly)]
6000 ~180 244 [interpolated from 2.5l + turbo specs, and max hp
cond.]
6400 ~160 217 [interpolated from 2.5l + turbo specs, and max hp
cond.]


Now, Subaru of Australia has published the actual torque curve of the XT
(http://subaru.com.au/downloads/929305.pdf ). You can see that my
estimate was within a felt-tip pen stroke (a very few percent) of this
curve. Interestingly, I left out the area between 2000rpm and 3600rpm
because I could not figure that one out. It turns out that there is a
slight saddle in the torque curve there – but nothing to be concerned about.

Other than patting myself on the shoulder here, I want to point out that
it is quite possible to get a good idea of an engine’s performance from
a few data points and specs that are available.

The above .pdf file is also describes other engine features quite nicely.

- D.

 
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