> Your saying he had this dynoed and it made 272 hp to the wheels! No way!
> The twin-turbo setup on the Z didn't add that much hp. Do I know enough
Well let's make some quick calculations. 1 bar = 14.7 psi. Technically, at 1
bar of boost, you have technically 2 bar of absolute pressure. Suppose your
engine breathe 300cfm (just a number in the air) at 1 bar, it will,
technically, breathe 600cfm at 2 bar. (if you don't understand why go take
some chemistry class and ask them about PV=nRT). Now 16psi of boost means
1.09bar, for a total of 2.09bar of absolute pressure. 145hp (stock SE power)
times 2.09 bar = 303hp, which probably means about 280hp at the wheels. Take
into account the fact that the stock intake manifold and head weren't
designed to flow 303hp of air, you get a little lower figure, however, he
probably has a modified intake and exhaust as well as some other tweaking,
which put us to about 272hp! Very possible. In case you care (and to make
this post SML relevant), on a 1.8l Sentra that would mean around 240hp at
the wheels (IF the engine can handle 16psi of boost).
This turbo kit seems interesting, but without JWT's "magical" ECU
reprogramming, I suppose he relies on some electronic gizmo to make sure
everything works. At 272whp, I doubt the stock injectors can handle it
(unless they are bigger than on previous SR20 iterations), the MAF is
probably ok though (they improved the design, it's now a true 3" MAF) but
the stock ECU probably has a hard time figuring out WTF is going on.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Have a question? Don't forget to check <http://www.sentra.net/>.
