One more thing to consider when going from a -6 (3/8) to a -8 (1/2) line is that pressure will slightly increase in the -8 line per Bernoulli’s equation. Check out this link:
"Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases."
Well, that was interesting and that pipe demo was cool...but one thing Im not getting is how exactly pressure INCREASES as a smaller pipe/hose goes into a LARGER pipe/hose...I would think the pressure would actually drop due to the increased diameter of the pipe/hose.
__________________ TRANS AM... That will be all... now
PSI is what you need to think about if you are at 60 psi in a 1/2" line and then you are at 60 psi in a 1" line you think they are the same? Per Square Inch Which one has more surface area? The larger line of course. 60 presure is the same, but if you actually measure it is more as a whole if you can understand it. 1PSI x 100 Square inches is 100 lbs and 1PSI x 200 square inches is 200 lbs maybe that helps you out. went from stock lines at 58psi to a 8AN line with billet rails at 58psi I had to drop the presure to @50psi to get it to lean out enough to drive it. Hope this helpes explain it for thost who were not understanding the way it works.
"Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases."
Well, that was interesting and that pipe demo was cool...but one thing Im not getting is how exactly pressure INCREASES as a smaller pipe/hose goes into a LARGER pipe/hose...I would think the pressure would actually drop due to the increased diameter of the pipe/hose.
Well, velocity drops, so pressure does the opposite and rises. However, pressure does not rise as much as velocity drops, they are not inversely proportionate. The mass flow rate is still the same in both sections of the pipe since it is an incompressible fluid flow analysis. If you want to look at the numerical proof, there are a couple links on that page that explain it. One of the links actually describes it without any numbers.
Dang, old thread. I have the stock feed, stock style filter etc. and 800RWHP. However, my injector duty cycle is higher than it should be even though enough fuel is getting through. Going to an -8AN feed soon.
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2000 A4 WS6 Trans Am 396ci - D1-SC - Stalled Auto - 3966lb - 808.65 RWHP 729.95 RWTQ - 9.98 at 130 MPH SOLD 11/09 2001 A4 Trans Am H/C - Stalled Auto - 3650lb - 442 RWHP 403 RWTQ - 11.6 @ 117 MPH (hitting the limiter) SOLD 1998 A4 Trans Am Very mild H/C - Stalled Auto - 3550lb - 396 RWHP 390 RWTQ - 12.0 @ 113 MPH SOLD
Is using that -8 feed line gonna make much of a difference since the '99 and up plastic bucket only has a 3/8 (-6) outlet?
Pump outlet lines will have to be changed too.
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2000 A4 WS6 Trans Am 396ci - D1-SC - Stalled Auto - 3966lb - 808.65 RWHP 729.95 RWTQ - 9.98 at 130 MPH SOLD 11/09 2001 A4 Trans Am H/C - Stalled Auto - 3650lb - 442 RWHP 403 RWTQ - 11.6 @ 117 MPH (hitting the limiter) SOLD 1998 A4 Trans Am Very mild H/C - Stalled Auto - 3550lb - 396 RWHP 390 RWTQ - 12.0 @ 113 MPH SOLD
Seeing as how most of you guys are a boosted application, what about N20 set ups? I'm upgrading to a 200 shot and don't want to go to a stand alone. I'd rather upgrade the entire system, but wouldn't mind saving a little dough in the process. I'm against the stand alone b/c I don't want to move the battery. I don't see why going the factory feed and evap as a return with new rails couldn't support 650ish on a nitrous hit.
We've made 995rwhp with stock feed/evap return through a turbo400 and twin external walbros, and 1,150rwhp with stock feed/evap return through a 6-speed with an intank walbro and external bosch "Y'd" together.
Im looking to make about the same hp using twin intanks. I sent you a pm
So twin in tanks and stock feed/evap lines with 60lb. injectors should handle a max of 600 rwhp fine? Doing a ebay turbo kit and this is the fuel system i would like to run until the beginning of summer.
Twins with the stock lines will support about 750rwhp. Leave your EVAP intact it is a very good venting system. If you exceed 750rwhp you will want bigger lines and a front mounted reg. setup. Give me a call I can help setup the proper fuel system for your needs.
Oh and questioned above the factory fittings out the top of the stock sender have been flow tested to over 1200rwhp it is the added line size of the -8 that helps get the volume to the rails.
, Kooks Headers, Gauge Pod, Spec 3, Alum. Flywheel, Spohn Torque Arm, MT ET Streets, ATI Damper with custom crank pulley, SLP SFC's
d'oh...I see now, for some reason I was thinking that the correlation between psi and area was negative. Thanks fellas.
