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Old 03-14-2003, 10:32 AM   #1
DonA
Scooby Specialist
 
Member#: 355
Join Date: Oct 1999
Chapter/Region: Tri-State
Location: Jersey Shore
Vehicle:
08' VW Touareg II
Alaska Grey

Post Software Sim USDM STi 1/4 mile Run

Bored at work I did a software simulated acceleration plot for the new STi. I know this is a guesstimate here were the parameters I usedů

Chassis Weight: 3254lbs.
Max Engine Speed: 7500 RPM



Torque (pound-feet)/RPM Pairs
(Based on average torque curves of similar 2.5l Turbo motors)

Torque RPM
1 140 2400
2 160 2600
3 180 2800
4 200 3000
5 220 3200
6 250 3400
7 260 3600
8 296 3800
9 300 4000
10 295 4200
11 290 4400
12 285 4600
13 280 4700
14 285 4800
15 280 5000
16 275 5200
17 270 5400
18 265 5600
19 260 5800
20 250 6000

Drivetrain

Gear 1 2 3 4 5 6 Final
Ratio (:1) 3.64 2.38 1.76 1.35 .971 .756 3.90

Drivetrian Torque loss: 20%
Clutch Slip Factor: 2

Shift Point
1-2 7000RPM Duration 500ms
2-3 7000RPM Duration 500ms
3-4 7000RPM Duration 500ms
4-5 7000RPM Duration 500ms
5-6 7000RPM Duration 500ms

Roll Out 10"
Launch 6000RPM

Results.....

Acceleration Simulator Results

Computing...

ET MPH Feet RPM Gear G Rear% Note(s)
0.01 0.31 0.0 6000 1 1.400 112.0
0.01 5.80 0.9 6000 1 1.391 111.6 *rollout*
0.25 13.13 4.2 6000 1 1.391 111.6
0.50 20.75 10.5 6000 1 1.389 111.5
0.75 28.36 19.6 6000 1 1.387 111.4
0.85 31.40 24.0 6042 1 1.386 111.4
0.86 31.56 24.4 6072 1 0.725 84.5
1.00 33.68 31.1 6481 1 0.664 82.0
1.21 36.40 42.0 7005 shift -0.018 54.3 *shift point*
1.25 36.39 44.1 7005 shift -0.018 54.3
1.50 36.29 57.4 7005 shift -0.018 54.3
1.55 36.27 60.1 7005 shift -0.018 54.3 *60 ft*
1.72 36.33 69.1 4571 2 0.577 78.5
1.75 36.71 70.8 4618 2 0.575 78.4
2.00 39.83 84.8 5011 2 0.564 77.9
2.25 42.86 100.0 5392 2 0.543 77.1
2.50 45.78 116.3 5760 2 0.523 76.3
2.75 48.56 133.6 6109 2 0.488 74.9
3.00 51.14 151.9 6433 2 0.453 73.4
3.25 53.53 171.1 6734 2 0.421 72.1
3.41 54.97 183.8 6916 2 0.402 71.3 *optimum shift pt*
3.50 55.66 191.2 7003 shift -0.026 54.0 *shift point*
3.75 55.52 211.5 7003 shift -0.026 54.0
4.18 55.38 231.9 7003 shift -0.025 54.0
4.25 57.60 252.6 5359 3 0.400 71.3
4.50 59.77 274.1 5560 3 0.391 70.9
4.53 60.03 276.8 5584 3 0.390 70.9 *60 MPH*
4.75 61.89 296.5 5758 3 0.383 70.6
5.00 63.95 319.5 5950 3 0.368 70.0
5.12 64.91 330.9 6039 3 0.361 69.7 *330 ft*
5.25 65.93 343.4 6133 3 0.353 69.4
5.50 67.82 367.9 6310 3 0.338 68.7
5.75 69.63 393.1 6478 3 0.324 68.2
6.00 71.37 419.0 6640 3 0.310 67.6
6.25 73.03 445.5 6794 3 0.297 67.1 *optimum shift pt*
6.50 74.62 472.6 6943 3 0.284 66.6
6.61 75.23 484.7 7000 shift -0.036 53.5 *shift point*
6.75 75.12 500.1 7000 shift -0.036 53.5
7.00 74.92 527.6 7000 shift -0.036 53.5
7.12 74.90 540.8 5345 4 0.295 67.0
7.25 75.74 555.2 5405 4 0.293 66.9
7.50 77.33 583.2 5519 4 0.289 66.7
7.60 77.96 594.6 5564 4 0.287 66.7 *1/8 mi (1)*
7.75 78.90 611.9 5631 4 0.284 66.6
8.00 80.45 641.1 5741 4 0.280 66.4
8.16 81.43 660.1 5811 4 0.277 66.3 *1/8 mi (2)*
8.25 81.97 670.9 5849 4 0.274 66.1
8.50 83.45 701.2 5955 4 0.267 65.8
8.75 84.89 732.1 6058 4 0.259 65.5
9.00 86.29 763.5 6158 4 0.252 65.3
9.25 87.66 795.4 6255 4 0.245 65.0
9.50 88.98 827.8 6350 4 0.239 64.7
9.75 90.27 860.7 6442 4 0.232 64.4
10.00 91.53 894.0 6532 4 0.226 64.2
10.25 92.75 927.8 6619 4 0.219 63.9
10.50 93.93 962.1 6703 4 0.213 63.7
10.75 95.09 996.7 6786 4 0.207 63.4
10.78 95.22 1000.9 6795 4 0.207 63.4 *1000 ft*
11.00 96.21 1031.8 6866 4 0.202 63.2
11.25 97.30 1067.3 6943 4 0.196 63.0
11.38 97.85 1085.9 6983 4 0.193 62.9 *optimum shift pt*
11.45 98.09 1096.0 7001 shift -0.053 52.8 *shift point*
11.50 98.04 1103.1 7001 shift -0.053 52.8
11.75 97.75 1139.0 7001 shift -0.053 52.9
11.96 97.56 1169.1 5007 5 0.195 62.9
12.00 97.73 1174.8 5016 5 0.195 62.9
12.25 98.79 1210.9 5071 5 0.193 62.8
12.50 99.85 1247.3 5125 5 0.191 62.8
12.54 100.01 1253.2 5133 5 0.191 62.7 *100 MPH*
12.55 100.06 1254.6 5136 5 0.190 62.7 *1/4 mi (1)*
12.75 100.89 1284.1 5178 5 0.189 62.7
13.00 101.92 1321.3 5231 5 0.187 62.6 *1/4 mi (2)*

Summary
0-60 mph: 4.71 Seconds
0-100 mph: 12.72 Seconds
60 ft: 1.55 @ 36.27
330 ft: 5.12 @ 64.91
1/8 mile: 8.16 @ 79.70 (81.43 actual)
1000 ft: 10.78 @ 95.22
1/4 mile: 13.00 @ 100.99 (101.92 actual)
Max Accel: 1.400 G
Air Density: 0.00231552 slug ft^3
Time Delta: 10.0 ms
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Old 03-14-2003, 10:43 AM   #2
spburns74
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Default

Nice launch RPM!!!!!!!!!!!! (6000 RPM)


MaxGrip
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Old 03-14-2003, 11:36 AM   #3
WRX_Mundi
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Member#: 33270
Join Date: Feb 2003
Chapter/Region: NWIC
Location: Boise, ID
Vehicle:
2004 STi
WR Blue

Default

You don't perchance have the script / program available, do you? It might be fun to play with some numbers.
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Old 03-14-2003, 12:02 PM   #4
Red-Impreza
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Thumbs up

Cool script! How does it account for wheel spin? Is that included in the clutch slip factor?
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Old 03-14-2003, 02:32 PM   #5
DonA
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Member#: 355
Join Date: Oct 1999
Chapter/Region: Tri-State
Location: Jersey Shore
Vehicle:
08' VW Touareg II
Alaska Grey

Default

Here you go....

Accel Sim

Please go easy on bandwidth
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Old 03-15-2003, 12:46 AM   #6
WRX_Mundi
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Join Date: Feb 2003
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2004 STi
WR Blue

Default

Thanks for the use of the script. Some questions:

- I'm guessing axle ratio is really final ratio (3.9), not the rear ratio of 2.95, based on the rpms at a given speed I'm seeing.

- Any clues on the clutch slip factor? You used 2, it started out 0.8.

- I chose 3250 lbs, 0.33 Cd, 100in wheelbase, which we know from specs. I left the 10 ft^2 cross section alone since I don't know this. I guessed a 16 inch center of gravity -- the default seems far too low for a road sedan, and I'd guess 16 is still pretty low (though I really don't know). Based on the standard WRX, I changed to 40% of the weight on the rear wheels -- I have a strong suspicion the program assumes RWD since this kills the launches. We can fake extra traction by lying about the weight distribution or by lying about the tire friction. I'm not pleased with either.

- Tires: I chose 25.0 inches as that's what I think the 225/45-17s end up. Didn't change anything else. I'm guessing you changed the static friction since I get about 1g to start while you get 1.4gs.


It's been fun playing. We need to know the rev limit rpm (7000rpm redline, but where does it cut us off?) and the real torque curve. By then we'll have people running all these numbers on real cars though. It'll still give me something to play with regarding shift points and estimated effects of modifications (at least at the drag strip -- we need a autocross / track simulator next!).

Thanks!
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Old 03-15-2003, 01:32 AM   #7
shoracer
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Red/Purple B***H

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Cool, but I like my GT3 simulation better. J/K thanks for the time and effort.
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Old 03-18-2003, 02:54 AM   #8
Jaemmo
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Member#: 5574
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Location: San Jose, CA
Vehicle:
02 WRX GDA WRB
87 CRX Si

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Does this sim give any top speed data?
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Old 03-18-2003, 09:55 AM   #9
DonA
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Member#: 355
Join Date: Oct 1999
Chapter/Region: Tri-State
Location: Jersey Shore
Vehicle:
08' VW Touareg II
Alaska Grey

Default

Quote:
Does this sim give any top speed data?

Sure it does but without wind tunnel data it would be hard to get a accurate result
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Old 03-19-2003, 12:16 PM   #10
yellows2k
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2002 Honda S2000
Spa Yellow

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nice calculations don. my dog could of figured out that one. Just kidding. can't wait to smoke you in my s2000. ill give you a car and the break

MAtt
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Old 03-19-2003, 06:22 PM   #11
DonA
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Member#: 355
Join Date: Oct 1999
Chapter/Region: Tri-State
Location: Jersey Shore
Vehicle:
08' VW Touareg II
Alaska Grey

Default

Matt tell your woman to wash her ass after I roast your S I am going to pull over and pork her in my back seat
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Old 03-20-2003, 12:23 PM   #12
yellows2k
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Member#: 16893
Join Date: Mar 2002
Location: Brick ,NJ
Vehicle:
2002 Honda S2000
Spa Yellow

Default

pork her with what. you have nothing to pork with. Kim told me

MAtt
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Old 03-22-2003, 09:17 PM   #13
Jaemmo
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Member#: 5574
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Location: San Jose, CA
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02 WRX GDA WRB
87 CRX Si

Default

Just read that the cd is .33. Can anyone punch up the top speed?
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Old 03-22-2003, 10:28 PM   #14
Broeli
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You have to add driver weight. Are you can to run the car on remote control or something?!
So, it would be more like 3450+ for the weight since the latest report for curb weight is 3275.
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