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, Thu, 2 Dec 2004 15:53:19
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Thanks Adam, and still, the question isn't about the engine. When I posted I didn't write something like "hey, I'm gonna bolt on a freakin' Disco Potato and gonna make 400 horsepowerz". But at the same time I do appreciate any relavent feedback that is well thought and related, and I do think that Saabnet Performance Board is more than a world-class place for knowledgeable well-thought questions and answers. The knowledge of the people on this board is nothing short of breathtaking.
I'm sorry to Zeke for flying off the handle--but I get enough Me Too bull crap at work. I've found generally that pre-conceived and mostly unexamined notions about how things are, regardless of the source, usually aren't exactly the gospel-truth like they're accepted to be---especially considering the intricacies of each unique application.
As far as clipping, yeah, I know what you're saying. On the other hand, there's not a very large, non-flow related, chance that it doesn't work. Considering that you're directly reducing the area of the turbine in relation to the area available for flow around that turbine, more exhaust has to be able to pass through...or possibly not, if that flow is too turbulent...in any case,
so that's what I was trying to gauge through real-world experience. In a perfect world I was hoping that perhaps someone with an EGT gauge/recorder had tried some variation and could give some feedback. From the shoddy numbers I've ran it IS a fairly close thing for a 6cm2 housing compared to the max CFM I was hoping to flow. Is clipping the most efficient answer? I doubt it. Is it good enough to flow what I'm hoping to flow? Well, maybe it was.
In any case, I've decided to go big and I think it looks like I'm going to spend the cash and get a 7cm2 TD04 with an oversized aftermarket compressor size a little larger than a 19T, which should match nicely with the 550 cc/min at 3.0 bar injectors I've fit tested. That's vs. the fabled Volvo Green Giants (Bosch 0-280-150-968) which seem to be guesstimated at an overdriven 465 cc/min at 3.8 bar.
Which actually is another case of popular thought that is wrong. I don't have the numbers in front of me right now, but even at what I assume to be an overdriven 465 cc/min, by calculation, indicates they are reaching near they're peak at anything too much over around 300---with precious little safety margin running at 100% duty cycle. Granted, people are running Viggens/SE's near 300 hp with stock injectors (Bosch 0-280-156-023 at 352 cc/min at 3.0 bar) but that's just plain dumb--and is actually a credit to the robustness of the control logic that Saab has generously given to the foolish (me included--my car is that way right now as I type this, with my 550 injectors sitting in the garage waiting for the correct software to use them). In any case, whether they come directly from large hp Volvos or not, Green Giants ABSOLUTELY ARE NOT BIG ENOUGH to support the Hp that many people are making, reccomended or not. In the real world they simply aren't larege enough to provide any safety reserve at all because they're already maxed-out...but Green Giants are easy to get in some places, so that's what we have as the "Big HP/Torque Injector" recomendation... Not trying to open a can of worms, and flame me if you want, but do me a favor and run the numbers at various rail pressures/engine-efficiencies for yourself first.
posted by 67.10.24...
, Thu, 2 Dec 2004 15:53:19, Sat, 4 Dec 2004 23:34:15, Sun, 5 Dec 2004 00:11:01
, Tue, 30 Nov 2004 20:19:11, Tue, 30 Nov 2004 18:45:47, Tue, 30 Nov 2004 06:33:39, Tue, 30 Nov 2004 05:22:46
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