I just read the article so I thought I'd pass on some info from it.
They tested it on 2 cars, one being a 200sx w/ ECU, cams, header, exhaust, and intake.
And the other a Sentra that they described as "lacking the cams, exhaust and
ecu of the 200sx." I assume the sentra had an intake and maybe a header by the
looks of the dyno results. The 200sx produced best results w/ the pressure set to
36psi while the sentra gained the most at 34psi. Here are some of the Dyno results.
3000 RPMS- no gain on either car
3500 RPMS- 200sx +.5HP, Sentra +.7HP
4000 RPMS- 200sx +.3HP, Sentra +.3HP
4500 RPMS- 200sx +1.1HP, Sentra -.4HP
5000 RPMS- 200sx +1.2HP, Sentra +1.3HP
5500 RPMS- 200sx +2.8HP, Sentra +2.2HP
6000 RPMS- 200sx +3.6HP, Sentra +3.5HP
6700 RPMS- 200sx +2.4HP, Sentra +4.0HP
Seems like a descent mod if the price is reasonable, but they don't
say the price in the new Stillen ad so I expect it to be expensive.
Earlier this week I called Jim Wolf and got a hold of Clark Steppler
(Mr. ECU). I had recently been to the dyno and the guy who ran the car had said that I was
running lean (posted a while back). I asked Clark if I could fax over the dyno charts and
wanted to know if he could confirm this. Clark said don't bother unless the guy had a
sniffer or some sort of airflow meter hooked up, the charts won't point to running lean.
OK, I had a some of responses (2-3) that said wolf runs the ECU on the lean side at WOT,
so I continued the conversation about their ECU being on the "lean" side. Clark
confirmed this. He mentioned that JWT had a chuckle at the Sport Car write up b/c they
thought the test car was WAY lean to begin with (sorry I didn't have the article), so they
were not surprised at the 3-4 hp gain. Also he thought that there was really not enough
information given about the before and after set / up or back to back to really know for
sure if the fuel pressure did much of anything. Clark says the ECU does the mix, and the
Fuel Pressure Riser should not make a difference (or I should say substantial difference)
besides making the car run RICH.
The article was in turbo magazine. Clark is totally correct. The car
does run on the rich side and the way the riser was hooked up AFTER the stock regulator,
it could only raise the fuel pressure to richen it up more.
Sometimes if you get the car too hot or too cool on the dynojet you
will register that kind of power gain or loss while doing nothing! thats why all of my
testing is based on the second back to back run once the cars temperature is stabilized.