3.0 VS 3.5 FPR - Saab Performance Bulletin Board - Saabnet.com
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3.0 VS 3.5 FPR
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Posted by Drew in Houston [Email] (more from Drew in Houston) on Mon, 22 Nov 2004 19:42:19 Share Post by Email
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Finally got the boost and WEGO wideband A/F meter hooked-up over the weekend...

and the boost is showing stock, as it should, at 15 psi at the manifold. The last time it was dynoed it showed 236 whp before the bigger intercooler and other flow mods so there is some decent flow going-on ('01 9-3 HOT).

Looking at the A/F logs it's hovering right between like 14.5 to 15.1 or so during idle, lift-throttle, and light loads. Medium loads take it to like 14.2-14.7 and WOT goes to around 12.5 and maintains. Once it touched 12.0 for about a 10th of a sec., but that's it. I'm real happy.

But I'm looking for opinions: With the way Trionic7 is, at this point is there any value in increasing the fuel rail pressure? That would allow 7 to decrease the injector duty cycle... Specifically considering injector longevity, would the increased pressure outweigh any gains from decreased ON time?

There is more in the works, and the way it's running now I have to think that I'm getting pretty close to 100% duty at WOT with the stock fuel pressure and injectors--which doesn't leave much of a safety margin if something went wrong and it needed more fuel.

Following those thoughts I started looking at what a 3.5 Bar 1:1 FPR would do to my rail pressures at various manifold pressures. And, can any FPR really linerally give a true 1:1 increase over the entire operating range? I've looked hard, but can't find any info. on real FP response curves VS manifold.

Does anyone have a favorite brand Variable FPR that does a good job? So far I've checked Mallory 4305M, Holley 512-505, and Aeromotive 13109--and am leaning towards one of the Aeromotive's if I go that route...

Any thoughts greatly appreciated!

posted by 67.10.24...

WEGO Wideband & Little Datalogger

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