S2000 Under The Hood S2000 Technical and Mechanical discussions.

2.2 versus 2.0 with various final drive gear spaghetti charts

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Old 11-14-2003, 09:19 PM
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I have been looking at these charts for about 20 minutes. I am so color blind all I see is a yellow line and a blue line and a whole bunch of gray lines. Is there anyway to put symbols on the lines?
Old 11-15-2003, 07:07 AM
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[QUOTE][B]Originally posted by silvershadow
I have been looking at these charts for about 20 minutes.
Old 11-15-2003, 07:16 PM
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I really am very colorblind. I got my wife (who is not color blind) to mark diamonds, squares, circles etc on the colors I could not see. Suddenly it made a lot more sense to me. The problem is that I see yellow and blue, but the other lines all looked to be the same color to me.

Anyway, the long and short of it is that I was able to interpret the graphs and found them very interesting. Very good piece of work.
Old 11-16-2003, 12:06 PM
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Gregg,

I am sorry to ask, but since the 4.77 equipped 2.0 is so close to the 4.10 equipped 2.2, would you do a wheel HP / speed chart for those 2? :Please:
Old 11-16-2003, 06:30 PM
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[QUOTE]Originally posted by gernby [/b]
Gregg,

I am sorry to ask, but since the 4.77 equipped 2.0 is so close to the 4.10 equipped 2.2, would you do a wheel HP / speed chart for those 2?
Old 11-17-2003, 06:07 AM
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I understand what you are saying, but it doesn't seem right. First off, HP = (torque * RPM) / 5252. Secondly, it seems that the RPM should be the RPM of the engine, not the wheels.
Old 11-17-2003, 10:15 AM
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[QUOTE][B]Originally posted by gernby
I understand what you are saying, but it doesn't seem right.
Old 11-17-2003, 11:02 AM
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Old 11-18-2003, 06:31 AM
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Originally posted by Windscreen
(assuming drive wheels of equal rolling diameters).
Hi Steve! Had I been able to contact you, I'd have invited you to dinner Sat. night in Milwaukee.

The assumption above is, I think, one of the problems. I don't know what the hot set-up is going to be when they're finally done with the new Hoosier sizes, but I'm guessing the '04 will be able to use the 275 rear, which may be tall enough to negate the gearing difference if we're using the shortest 245's (I'd have an exact answer, but I haven't seen a final spec sheet from Hoosier).

And not to steer things off-topic, but it looks the new Hoosier may be available in a 255/50, which will be tall, but I'm wondering if it might give us an advantage in places where we could carry out 1st just a little longer (thinking of the return side at Peru one weekend this past year). Hmmmm, changing rear tires based on course layout?
Old 11-18-2003, 08:26 AM
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Originally posted by gernby
I wouldn't worry too much about the torque difference at the top of each gear. From what I can tell, this is due to the roll-off that occurs on a stock 00-03 (severely) after 8300 RPM. From what I recall, you have corrected that roll-off with your VAFC, so you would be less impacted by this. I would think that your car would be very evenly matched with a stock 04, assuming these graphs are real-world accurate. You might even have a slight advantage w/ your additional power/torque over a stock 00-03, especially right after each upshift.

Of course, this only applies to your car vs. a bone-stock '04. For a B-stock comparison, this chart seems to show that the '04 is going to have a significant advantage over 00-03s, since I expect most courses will spend a lot of time between 40 & 60.


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