Many of you already using AP-22 performance meter?

I have some results & some questions.

What Vehicle Data are used, especially CdA, Rolling Resistance & Tilt-factor?

The first data of my scoob (my99, open exhaust, EMS-chipped, VF23, lowered with stiff suspension, etc):
Mass: 1240 (empty, also without spare-wheel, of no use anymore because of big brakes front & rear)
CdA: guess (did some calculation) around 0.8
RR: guess around 0.019-0.020
Tilt-factor: don't know, my sub is very stiff, so I guess less than 0.007?

Are roll & smoothing factor of importance for acceleration-results (or just for power-figures)?

Today I compared figures from AP-22 with G-Tech-Pro:

Distance 0.400km 164.4kph 14.40s
Pk Power: 120.2kph 8.39s 0.160km 248hp
Peak G: 31.5kph 1.40s 0.004km 0.88g

G-Tech: 13.7 sec; speed 171.4 km/u

Also 0 - 100 km/u;
G-Tech all the time was 0.3-0.4 quicker.

My best 0 -200 km/u results today (the shifting could be better):


Start Speed 0.0kph
kph s g km hp
10.0 0.61 0.54 0.000 28
20.0 0.99 0.75 0.002 75
30.0 1.35 0.77 0.004 116
40.0 1.70 0.83 0.008 168
50.0 2.04 0.76 0.012 194
60.0 2.98 0.39 0.027 123
70.0 3.73 0.46 0.040 172
80.0 4.27 0.51 0.052 218
90.0 4.84 0.48 0.065 233
100.0 5.50 0.37 0.083 208
110.0 7.10 0.35 0.129 219
120.0 7.90 0.35 0.154 244
130.0 8.74 0.32 0.184 248
140.0 10.54 0.09 0.253 115
150.0 11.85 0.22 0.306 224
160.0 13.11 0.21 0.360 237
170.0 14.43 0.21 0.421 259
180.0 15.88 0.19 0.492 267
190.0 17.56 0.14 0.579 244
200.0 21.44 0.12 0.789 249

Pk Power: 185.9kph 16.82s 0.540km 271hp
Peak G: 44.8kph 1.84s 0.009km 0.89g
----------------------------------------


And top-speed (slow start because of 'saving clutch'):


Start Speed 0.0kph
kph s g km hp
10.0 0.77 0.44 0.000 22
20.0 1.29 0.52 0.003 54
30.0 1.99 0.43 0.007 68
40.0 2.54 0.55 0.013 115
50.0 3.70 0.23 0.028 65
60.0 4.55 0.37 0.041 122
70.0 5.17 0.48 0.052 183
80.0 5.76 0.48 0.065 208
90.0 6.40 0.43 0.080 215
100.0 8.12 0.24 0.126 145
110.0 8.96 0.34 0.150 217
120.0 9.80 0.34 0.177 241
130.0 10.70 0.30 0.209 242
140.0 11.77 0.25 0.249 231
150.0 13.97 0.21 0.338 223
160.0 15.36 0.19 0.398 230
170.0 16.85 0.17 0.467 238
180.0 18.54 0.14 0.550 234
190.0 20.65 0.11 0.659 222
200.0 23.39 0.08 0.808 218
210.0 28.86 0.07 1.120 232
220.0 32.83 0.06 1.359 239
230.0 38.12 0.05 1.692 260
240.0 47.01 0.03 2.276 264
250.0 151.33 0.03 8.357 292

Pk Power: 251.0kph 152.14s 8.413km 310hp
Peak G: 190.9kph 157.73s 8.778km 0.71g

Some more thoughts & questions:
I wonder how accurate AP-22 is with high speeds; specially the power-figures with that speeds are much too high.

Last november Powerstation's rollin'road gave this figure:
P-eng : 259,5 BHP
P-wheel: 173,5 BHP
Torque: 248 lbf-ft (4640 rpm)

Since than I just changed the st-turbo for a VF23 (guess 15-20 bhp more).

Last question: difference between power-engine & power-wheels with a scoob is always around: 1 : 0.65-0.70?

grts Geert



[This message has been edited by psyg (edited 12 February 2001).]

psyg,

I think you need someone with a PhD in nuclear physics to interpret this post http://bbs.scoobynet.co.uk/smile.gif

Gastro

PS Er- I dont use an AP-22 performance meter............!

Sorry m8, haven't a scoob! ( that's clever cockney rhyming slang for I haven't a clue, I haven't a scooby doo, I haven't a scoob).
Bob
PS I don't have a AP-22 either!

Gastro, no PhD's please..., http://bbs.scoobynet.co.uk/wink.gif just somebody who is also liking to play with an AP-22;

2 weeks ago I was an ignorant guy like you http://bbs.scoobynet.co.uk/biggrin.gif

Geert

I have a Phd in nuclear physics, an AP-22 and a subaru. Looks like the CDA value is wrong if you're getting high power values at high speeds. When the CDA is correct you should get similar power levels in most gears. I think 2nd gear levels are best as air resistance is not too critical and you should be out of wheelspin. I did some coast down runs using the AP-22 and ended up with a CDa of 1.2 (!) so I'm still not sure about CDA values. More coasting...