</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MaxRaceSoftware:
<strong> Calculated Finish line RPM at 1320 Ft = 6778.0 RPM
if crossing at 6900 RPM then clutch is slipping = 1.77 percent</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Larry, after reading this I went back and double checked the incar video I have of that run and it does look like I'm crossing the line just as the rpm's are hitting 6800, not 6900 rpm.
So that would put it closer in line with your caculations.
I don't think the clutch is slipping, at least it doesn't feel like it.

Looks like I need to work on improving my 0-60' times. <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

Thanks for the information.

Gordon

<small>[ June 27, 2002, 08:25 PM: Message edited by: GTS SS ]</small>

 

Very interesting thread!

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">you are loosing as much as 48.4 peak HP Loss
to traction from 0 Feet -to- 60 Feet distance</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">good lord I can imagine how much HP I was wasting then on the run I posted above. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
<img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

Steve

 

Fred
-------------------------

Flywheel
Peak HP=349.0 (600 RPM/SEC dyno acceleration rate)
Peak Torque=351.5 (600 RPM/SEC dyno acceleration rate)

Peak HP=367.8 (Steady-State non-Acceleration)
Peak Torque=369.4 (Steady-State non-Acceleration)

Peak Ram-Air HP gain at 1320 Ft= 4.60 HP

Peak Volumetric Efficiency percent = 92.50 Ve%

Rear tire rollout at 1320 Ft= 80.8
Rear tire growth at 1320 Ft= 0.20 inch increase

Calculated engine RPM at 1320 Ft= 5776 to 5794 RPM

60= 2.107 33.810
330= 5.660 67.501
660= 8.560 85.108 to 84.585
1000= 11.054 98.626
1320= 13.181 105.554 to 106.206

0 to 30 mph= 1.789 seconds
0 to 60 mph= 4.733 seconds
0 to 80 mph= 7.443 seconds
0 to 100 mph= 11.393 seconds
0 to 120 mph= 14.917 seconds

Ft ET MPH
-1 -0.299 0.000 = Rollout ET @ 12 inches
0 0.000 4.564 = Rollout MPH @ 12 inches
1 0.203 5.725
2 0.301 7.876
-----------------------------------------------------

your tires show only about .50 to .60 Friction Coefficient
not the world's best tire ??

This would be like an "Ideal" traction 1/4 mile pass
for your race car ;
60= 1.677 38.181
330= 5.010 69.381
660= 7.872 85.499 to 84.449
1000= 10.368 98.368
1320= 12.500 105.383 to 106.693

0 to 30 mph= 1.087 seconds
0 to 60 mph= 3.804 seconds
0 to 80 mph= 6.632 seconds
0 to 100 mph= 10.781 seconds
0 to 120 mph= 14.163 seconds

 

Steve ,
--------------------------------------------------------------------------------
you are loosing as much as 48.4 peak HP Loss
to traction from 0 Feet -to- 60 Feet distance
--------------------------------------------------------------------------------
its not
461.4 + 48.4 = 509.8

but instead
461.4 - 48.4 = 413.0 during launch to 60 Feet

Gordon still has approx.

Flywheel
Peak HP=461.4 (600 RPM/SEC dyno acceleration)
Peak Torque=406.4 (600 RPM/SEC dyno acceleration)

Peak HP=484.5 (Steady-State non-Acceleration)
Peak Torque=426.7 (Steady-State non-Acceleration)

 

Not the best tire, not the worst tire, but definitely NOT the best track.

Where do you get the software that does the calculations from? Is it available for download/purchase?

If not, then I'll have to look you up when the stuttering is gone and I can actually shift the car properly.

 

Larry, I know this probably won't be the most accurate since SCD did not have their 330' and 1000' clocks working when I made this pass. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> Oh well, here is the info:

1-Total Car Weight with driver (3400lbs)
2-Frontal Area in Sq.Ft. (1999 Pontiac Trans Am, non-ram air)
3-Cd (Drag Coefficient) see above
4-Automatic/Converter or Standard/Clutch (Standard/clutch)
5-Ram-Air HoodScoop or breathing just underhood air (no Ram-Air) (under car ram air; Fast Toys Ram Air kit)
6-Shift RPM (6700)
7-Cross RPM (6600)
8- 1/4 mile ET and 1/4 mile MPH from time slip 11.16@125.59
9- Barometric Pressure Inches Hg. 30.45
10-Temperature degrees F 60*
11- Relative Humidity % percent 36%

Other info:

60': 1.661
1/8 mile: 7.221
no mph <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

1- Transmission Ratios for all gears/speeds 2.66, 1.78, 1.30, 1.00
2- Rear gear ratio 4.30
3- Rear tire diameter or rollout in inches 26.1"
4- Rear tire width in inches 10"
5- Rear wheel rim width in inches 8"
6- Launch RPM 5000 rpm
7- Converter (Max) Stall RPM n/a
8- Track Elevation in Feet (track's physical height) 36'
9- Density Altitude in feet -353'
10- Wet Bulb Temp deg F 60
11- Vapor pressure in Inches Hg. 30.45
12- Engine Size in cubic inches 346ci
13- Compression Ratio 11.3:1

<small>[ June 28, 2002, 12:12 AM: Message edited by: Jason99T/A ]</small>

 

Jason , here's something quick for you to look at what 330Ft and 1000FT should have been !!

i have to go finish porting some heads , so by tomorrow afternoon i do a simulation and post results .

60= 1.661 40.459
330= 4.706 77.791
660= 7.221 98.376 to 100.766
1000= 9.363 115.742
1320= 11.160 125.745 to 122.762

0 to 30 mph= 1.035 seconds
0 to 60 mph= 3.091 seconds
0 to 80 mph= 4.925 seconds
0 to 100 mph= 7.190 seconds
0 to 120 mph= 10.025 seconds

Ft ET MPH
-1 -0.236 0.000 = Rollout ET @ 12 inches
0 0.000 5.789 = Rollout MPH @ 12 inches
1 0.138 7.935
2 0.210 10.619
3 0.269 12.491
4 0.320 13.999
5 0.367 15.288
6 0.410 16.426
7 0.450 17.452
8 0.488 18.393
9 0.524 19.263

 

Thanks Larry! I'm looking forward to the simulation. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Jason

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Steve ,
--------------------------------------------------------------------------------
you are loosing as much as 48.4 peak HP Loss
to traction from 0 Feet -to- 60 Feet distance
--------------------------------------------------------------------------------
its not
461.4 + 48.4 = 509.8

but instead
461.4 - 48.4 = 413.0 during launch to 60 Feet

</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yes, I understood that part Larry. I was just thinking if Gordon had wasted a full 48hp on his 1.55 60ft launch, I must have wasted on the order of 200 or so of my potential hp getting the car moving.
Am I correct in this thinking?
Steve

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Jason99T/A:
8- Track Elevation in Feet (track's physical height) 60'</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Jason,
SCD's track elevation is 36'.

Gordon

<small>[ June 27, 2002, 11:26 PM: Message edited by: GTS SS ]</small>

 

Ahhh, thanks Gordo. I couldn't find the info anywhere. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

BTW, where have you been?? I'll give you a call whenever I swing through the hood (aka St. Francisville <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> ).

Jason

 

1-3400
2-98 C5 Coupe
3-98 C5 Coupe
4-Stock Converter
5-No Ram-Air
6-6300
7-Cross RPM
8-12.76 @ 109.52, 1.96 60'
9-@30"
10-60
11-Not on slip, dry day though.

2- Rear gear ratio 3.15's
3- Rear tire diameter 25.7"
4- Rear tire width in inches 11"
5- Rear wheel rim width in inches 8.5"
6- Launch RPM idle
7- Converter (Max) Stall RPM Stock, 1800?
8- Track Elevation in Feet (track's physical height) Under 50'
12- Engine Size in cubic inches 346
13- Compression Ratio Stock LS1

 

Okay, I'll play <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

1- 3626 lbs
2- 1998 Pontiac Formula
3- Cd = See above
4- manual tranny/clutch
5- air (no Ram-Air)
6- Shift RPM = 6650
7- Cross RPM = 6800
8- 10.67 @ 128.36 mph
9- 30.1 inHg
10- 78F
11- 80% humidity

60 Ft = 1.49
660 FT = 6.83 @ 101.26 mph
1320 FT + MPH = 10.67 @ 128.36

1- Transmission Ratios (T56 6-speed, using 1-4)
2- Rear gear ratio (4.10)
3- Rear tire diameter = 26"
4- Rear tire width in inches = 10"
5- Rear wheel rim width in inches = 8"
6- Launch RPM = 4500
8- Track Elevation in Feet = 0 feet (sea level)
9- Density Altitude in feet = +1222 feet
10- Wet Bulb Temp deg F = ?
11- Vapor pressure in Inches Hg. = ?
12- Engine Size in cubic inches = 434 ci
13- Compression Ratio = 11.7:1 CR

<img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

Thanks Larry! Assuming the car could have cut a low 1.5 60' (1.52 or so), what would the car have run with the combo/weather listed above?

Jason

 

Jason ;
Flywheel
Peak HP=459.0 (600 RPM/SEC dyno acceleration rate)
Peak Torque=411.8 (600 RPM/SEC dyno acceleration rate)

Peak HP=481.4 (Steady-State non-Acceleration)
Peak Torque=424.0 (Steady-State non-Acceleration)

Peak Ram-Air HoorsePower gain= 9.1 HP

Peak Volumetric Efficiency percent= 106.8 Ve%

Absolute Minimum Flywheel HorsePower= 444.7 HP

Minimum Traction HorsePower Loss = 35.0 -to- 80 HP Max

Rear tire rollout at 1320 Ft= 82.70 inches
Rear tire growth at 1320 Ft= .70 inches

Calculated engine RPM at 1320 Ft= 6899 RPM (= 125.59 MPH)

Crossing at 6600 RPM = 120.060 MPH (=6600 RPM)

60= 1.661 40.459
330= 4.706 77.791
660= 7.221 98.376 to 100.766
1000= 9.363 115.742
1320= 11.160 125.745 to 122.762

0 to 30 mph= 1.035 seconds
0 to 60 mph= 3.091 seconds
0 to 80 mph= 4.925 seconds
0 to 100 mph= 7.190 seconds
0 to 120 mph= 10.025 seconds

Ft ET MPH
-1 -0.236 0.000 = Rollout ET @ 12 inches
0 0.000 5.789 = Rollout MPH @ 12 inches

 

2950 LBS
4.88 REAR GEAR
2.48 1ST 1.78 2ND 1.0 3RD
4500 STALL
33" REAR TIRE 17" TREAD
25" FRONT
BODY STYLE 65 NOVA HT
377 MOTOR
4700 FT DA
13.3-1
1.31 60FT 9.80@136
OVER REVING SOME

 

LAUNCH RPM WAS 3000 ON T-BRAKE, SHIFT AT 7000

 

1. 2950
2. 24 FRONTAL
3. .35 CO-E
4. TH400 3 SPEED AUTO T-BRAKE 4500 STALL
5. COWL AIR
6. 7000 SHIFT
7. 7600 TRAP
8. 1.31 60FT 9.80 @ 134
9. 29? BAR
10. 80* TEMP
11. 65 HUMIDITY

1. 2.48/1.78/1.0 TRANS GEARS
2. 4.88 GEAR
3. 33.5 TALL TIRE
4. 17.125 TREAD
5. 14 WIDE RIM
6. 3000 RPM LAUNCH
7. 4500 STALL
8.3000 FT ELEVATION
9. 4900 FT DA
10.TEMP 80*
11. VAPOR?
12. 377 CID MOTOR
13.3-1 COMPRESSION

 

http://www.wunderground.com

Notice ; to get better program accuracy prediction of your Flywheel HorsePower

then you might want to make sure the Weather condition are correct

to do this , you can use above Link
and there is a "Historical" button with
Date/Year ..just enter the ZipCode closest to the DragStrip you ran at , then enter that date etc.
and a "Historical" weather log will popup ...check this weather -VS- your weather and maybe post both noting which is which , gor a little better accuracy !

Thanks

 

Steve ,
it looks like 220 to 230 HorsePower Loss
from starting line to 60 Ft

very hard to model, because of tire spin , there
is NO Torque Muliplication coming from the
Torque Converter that shows up because of spin.