[s-cars] 'Rex Blows' at autospeed.com

[mlped at qwest.net]

Re:  Stebro vs. Stromung Exhaust

If yoiu decide you're interested enough to take on some of the mapping etc.=
  a place to start might be here, REex Sucks Part II.

FWIW, if I read him correctly, in rough round numbers the author suggests t=
hat  in a 94 WRX making @ 10 psi of boost at redline 7,000 rpm, he's pushin=
g @ 17.5 psi in exhaust manifold pressure PRE turbo, roughly 8.7 psi  post =
turbo using theOEM single  2&3/8th inch OD plumbing.  The switch to 3"OD & =
some muffler massaging droped him from an estimate 10 kPa @ 3,000 &< rpm to=
 0 measured back pressure, and a reduction in his MAXIMUM backpressure from=
 @ 60 kPa (8.7 psi) to 20 kPa (@ 3 psi).  As a result of all this, he THINK=
S he picked up @ 12 kW (135 vs 121 or 123) or 16 to 20 bhp.   YMMV & OTOH, =
FWLIMBW in early poorly insturmented attempts on my part to try to get at l=
east SOME kind of stock exhaust back pressure info (i.e. post trubo) I don'=
t think I ever saw the pressure gauge hooked in at the OEM sniffer point ex=
ceed 3 psi on a STOCK exhaust system.  Does anyone else have any better #'s?

Mikee

Regards,

M Pederson