[Fox944]

here is a dynochart, so you can see the bump in power once it get over 4K.

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[Cloud9...68]

Interesting how there's a noticeable dip in torque from about 3200 to 3700 rpm. No wonder it feels like things really kick in at about 4000 rpm (though I would think you'd start feeling it at about 3700 rpm). It's nice how the peak hp happens at the stock redline of 6400 rpm.

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[Fox944]

You dont feel the dip in torque when driving. The RPM's are climbing; so despite the dip in torque, there is no dip in the hp. Upshifting at 7K keeps you in the meat of the powerband. When compared to other 968's (or even prior to doings cams), the car is really quick up top.

When everything is said and done, i will likely do a 50shot of nitrous. The one thing that holds me back is fear of damaging my engine. Its a high compression motor with big cams.

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[Cloud9...68]

I know we're straying off the original topic of comparison of different exhausts, but I have one (hopefully last) observation: If you extrapolate the very linear portion of your horsepower curve that goes from 2000 to 3000 rpm, the extrapolated line would intersect the HP curve at about 5000 rpm (where you're producing about 225 hp). So, it would seem to me that if you could engineer a nitrous system that squirts enough nitrous to overcome the "pause" in the horsepower curve between about 3000 and 3700 rpm, and then another smaller squirt between about 4200 and 5000 rpm, you'd have a beautiful, linear horsepower curve, without putting the excessive stress on your engine that would come from injecting nitrous at the point where the engine is producing its peak horsepower. I'm not sure nitrous systems are sophisticated enough to do this, and it would probably entail a fair bit of dyno work to get right, but I would think the end result would be an engine with a very nice power band.

Also, you've mentioned that you have a lightweight flywheel and power pullies. In your quest of maximum peak power, do you also have a windage tray? I hear they're worth maybe 2-3 hp at the high end, which would get you close to your goal of 250 rwhp. They are a pain to install, but it might be something to consider.

Thanks for letting me (and others too, I'm sure) live vicariously though your mods while I save up to do the same to my engine [img]style_emoticons/<#EMO_DIR#>/wink.gif[/img]

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[Fox944]

Your ideas with the nitrous systems are very interesting to say the least. I don't have the experiance, but anything is possible. A system like you described would be awesome, but not easy to build (or cheap).

I dont have a windage tray. Not yet anyway.

The best part about building these cars is the knowledge and know how gained. 5 years ago, most people did not think this was possible. Trial and era, testing and playing with different set-ups has given Pete massive knowledge on what works, and what works best. At the end of the day, it will only make it cheaper for others to make this much power.

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[Cloud9...68]

<!--quoteo(post=72055:date=May 17 2009, 01:07 PM:name=Fox944)-->QUOTE (Fox944 @ May 17 2009, 01:07 PM) <{POST_SNAPBACK}><!--quotec-->The best part about building these cars is the knowledge and know how gained. 5 years ago, most people did not think this was possible.<!--QuoteEnd--><!--QuoteEEnd-->
So true. I remember years ago people saying things like "It doesn't seem possible to get any more power out of these mysterious engines..." It looks like the "mystery" has been solved. The 93+ hp/liter you have achieved from a 15-year-old normally aspirated engine is truly a world-class number, even by modern standards.

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[DiREW0LF]

Joel, does your catback have a resonator?

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