S2000 Under The Hood S2000 Technical and Mechanical discussions.

CAI & VAFC Installed (dynos)

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Old Dec 28, 2003 | 06:59 PM
  #11  
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Chiung,

Good points bout the accesory loss.

And, class change? In a word, no.

I run in two different classes G/GS and G/FS. The first G is a class designation for 1500 to 2000 cc motors. The next letter, G or F, indicates if I am running Gas or Fuel. Now Bonneville is a great place to race and has some different rules to facilitate their unique style of racing. To compete in a Gas class you have to show up at the fuel truck at the meet with an empty gas tank. They will flashlight it to be sure. Then you buy gas from the truck and they seal your tank. when you show up later for record certification they check the seal.

ANY other fuel you run, or if you choose to not get your tank sealed qualifies you for Fuel class. I was still trying to get the motor to run properly in August when they ran out of 100 unleaded, so I went back to my pickup and dumped in some 91 octane I had brought along. Then I signed up for Fuel class (G/FS) and set a record there. The fact that my Fuel record is slower than my Gas record is only because they were set at two different meets, and my motor was running a WHOLE lot better the second meet. And I was redlined in 6th at the five mile mark so even if I intalled the NOS I brought along, it would not have made a difference.

And the S? That stands for Streamliner. A purpose built racecar class that has all four wheels enclosed by more that 120 degrees of streamlining or fairings, or, like mine, totally enclosed within the body.

Each category of car, roadster, truck, lakester, what have you can have engines from unlmited down to 50 cc's in some cases. And every subcategory can be Gas, Blown Gas, Fuel or Blown Fuel. Whatever else you do has no effect, but most folks don't run any accesories.

An exception was the Vintage Air Conditioning folks. A few years back they got their old Studebaker, a nice aerodynamic design to go over 200 MPH with the air conditioning on as a publicity deal http://vintageair.com/

Anyway, that's enough for now.

Have fun,

Jim
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Old Dec 28, 2003 | 07:37 PM
  #12  
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Originally posted by jimknapp
And, yeah, your stock fuel curve is way prettier.
Yeah, I know. The CAI really throws a wrench in things. It causes two big "lean" spikes, one around 3700 and another just after 6000. Each one is followed by a "rich" dip. I did the best I could to clean those up, but didn't have much luck. I did OK with the one on the low end, but didn't have much luck with the high end.
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Old Dec 28, 2003 | 08:39 PM
  #13  
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Very nice numbers

Karim
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Old Jan 14, 2004 | 08:20 PM
  #14  
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Were these all done at Speedworks? What software did you use to do the graphs? It doesn't look like anything I've gotten from Speedworks, or from the DynoJet Run Viewer...

There also seems to be a difference from one plot to the next on dyno run 23. The 1st plot shows a max of 215.09 / 143.90, and the second shows a max of 214.54 / 143.81.

Other than that, nice gains! You are now my local target!
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Old Jan 14, 2004 | 09:30 PM
  #15  
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Originally posted by gernby
Were these all done at Speedworks? What software did you use to do the graphs? It doesn't look like anything I've gotten from Speedworks, or from the DynoJet Run Viewer...
These are all from Speedworks, and they are from the latest version of the Run Viewer, v7.0.1.0. The version that I used to have had a version number that seemed higher to me, but this is actually the latest and greatest version.

[QUOTE]Originally posted by gernby
There also seems to be a difference from one plot to the next on dyno run 23.
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Old Jan 15, 2004 | 07:46 AM
  #16  
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Isn't that still pretty rich? It looks like you are around 13.2 on average AFTER the cat, which might be an actual 12.8 or so.
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Old Jan 15, 2004 | 10:11 AM
  #17  
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[QUOTE]Originally posted by gernby
Isn't that still pretty rich?
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