I need your help....
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
I need your help....
Hey guys, I'm working on a quartermile dragstrip simulator. It works off of dyno numbers. I've got the stuff setup but I need some more real world data to double check everything is right. If anybody can step up with some info I'd love to have it. Here's what I'd need.
Horsepower from a dyno
2500:
3000:
3500:
4000:
4500:
5000:
5500:
6000:
6500:
7000:
Type of dyno: Mustang or Dynojet
Type of Transmission(be specific please)
Shift RPM
Rear End Ratio
Tire Size
Race Weight of veicle and driver
60' times
Type of vehicle (for aerodynamic properties)
Then I would need a timeslip 60' and quarter stats are the only ones I really need, but the rest would help.
60'
330'
1/8 mile @ mph
1000'
1/4 mile @ mph
Horsepower from a dyno
2500:
3000:
3500:
4000:
4500:
5000:
5500:
6000:
6500:
7000:
Type of dyno: Mustang or Dynojet
Type of Transmission(be specific please)
Shift RPM
Rear End Ratio
Tire Size
Race Weight of veicle and driver
60' times
Type of vehicle (for aerodynamic properties)
Then I would need a timeslip 60' and quarter stats are the only ones I really need, but the rest would help.
60'
330'
1/8 mile @ mph
1000'
1/4 mile @ mph
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Here ya go.
Horsepower (at the crank) from a dyno
2400: 138
2600: 152
2800: 165
3000: 178
3200: 189
3400: 200
3600: 208
3800: 221
4000: 227
4200: 232
4400: 237
4600: 239
4800: 240
5000: 239
5200: 232
5400: 222
5600: 210
5800: 195
6000: 178
6500: ---
7000: ---
Type of dyno: Dynojet
Type of Transmission(be specific please): 700R/4 with 2,000rpm TC
Launch RPM: 1,700rpm
Shift RPM: 1-2 @5,200rpm; 2-3 @5,800rpm
Rear End Ratio: 2.59:1
Tire Size: 25.6" diameter, GY Eable 275/40-17
Race Weight of veicle and driver: 3355 lbs
Type of vehicle (for aerodynamic properties): 1988 Corvette coupe
Then I would need a timeslip 60' and quarter stats are the only ones I really need, but the rest would help.
60' - 1.913sec
330' - 5.481sec
1/8 mile @ mph - 8.447sec @83.01mph
1000' - 11.013sec
1/4 mile @ mph - 13.205sec @101.73mph
Horsepower (at the crank) from a dyno
2400: 138
2600: 152
2800: 165
3000: 178
3200: 189
3400: 200
3600: 208
3800: 221
4000: 227
4200: 232
4400: 237
4600: 239
4800: 240
5000: 239
5200: 232
5400: 222
5600: 210
5800: 195
6000: 178
6500: ---
7000: ---
Type of dyno: Dynojet
Type of Transmission(be specific please): 700R/4 with 2,000rpm TC
Launch RPM: 1,700rpm
Shift RPM: 1-2 @5,200rpm; 2-3 @5,800rpm
Rear End Ratio: 2.59:1
Tire Size: 25.6" diameter, GY Eable 275/40-17
Race Weight of veicle and driver: 3355 lbs
Type of vehicle (for aerodynamic properties): 1988 Corvette coupe
Then I would need a timeslip 60' and quarter stats are the only ones I really need, but the rest would help.
60' - 1.913sec
330' - 5.481sec
1/8 mile @ mph - 8.447sec @83.01mph
1000' - 11.013sec
1/4 mile @ mph - 13.205sec @101.73mph
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Here's what I got from my calculations. Seems pretty close. I hope I can get a few more. Thanks.
60' 1.918
330' 5.369
1/8 mile 8.386 @ 83.134 mph
1000' 10.976
1/4 mile 13.174 @ 102.829 mph
RPM crossing finish line 3497
0-60 mph time 4.49
Originally Posted by 65Z01
60' - 1.913sec
330' - 5.481sec
1/8 mile @ mph - 8.447sec @83.01mph
1000' - 11.013sec
1/4 mile @ mph - 13.205sec @101.73mph
330' - 5.481sec
1/8 mile @ mph - 8.447sec @83.01mph
1000' - 11.013sec
1/4 mile @ mph - 13.205sec @101.73mph
60' 1.918
330' 5.369
1/8 mile 8.386 @ 83.134 mph
1000' 10.976
1/4 mile 13.174 @ 102.829 mph
RPM crossing finish line 3497
0-60 mph time 4.49
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
mn_vette interesting that you got pretty close.
Have you put in vehicle frontal area & form factor?
Do you take into account traction and converter slippage percentage.
Some of these may help you get even closer.
But don't foreget that some things, like coolant temp, can vary engine HP at the time of a race so that the actual power curve may not exactly agree with the dyno.
I use Drag2000 drag strip simulation to optimize parameters for the strip and found that I have to tweak items like traction and launch RPM to get the numbers to exactly agree with time slips.
Have you put in vehicle frontal area & form factor?
Do you take into account traction and converter slippage percentage.
Some of these may help you get even closer.
But don't foreget that some things, like coolant temp, can vary engine HP at the time of a race so that the actual power curve may not exactly agree with the dyno.
I use Drag2000 drag strip simulation to optimize parameters for the strip and found that I have to tweak items like traction and launch RPM to get the numbers to exactly agree with time slips.
Drifting
Joined: Feb 2002
Posts: 1,952
Likes: 2
From: Little Rock Arkansas
Quarter Jr. and Performance Trends ET Analyzer are the two best programs I've used. On the Super Stocker using PT's 4-link calculator and ET program we're within .02 of our actual ET's and MPH is DEAD on! Of course 2.5 hours worth of screwing with the parameters to make sure EVERYTHING is spot-on helps with the results.
-Jeb
-Jeb
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Originally Posted by 65Z01
mn_vette interesting that you got pretty close.
Have you put in vehicle frontal area & form factor?
Do you take into account traction and converter slippage percentage.
Have you put in vehicle frontal area & form factor?
Do you take into account traction and converter slippage percentage.
The converter slippage is actually covered in the RWHP numbers. if there is any kind of sliping going on it will show up in the numbers.
I do use drag coefficients and square feet of frontal area to find the aerodynamic resistance used. If I modified it slightly I could find the theoretical top speed of a vehicle(hp limited not gear limited), but it would take longer for the thing to run. http://www.teknett.com/pwp/drmayf/tbls.htm
I know that this isn't one of those hightech calculators, but its nice to have something to give you just a general reference. Besides I was bored a few days at work and whipped it up. I'm just trying to figure out if I'm close to accurate. I'd still like to get some more hp and timeslip numbers.
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Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Originally Posted by 65Z01
Umm, so what is your line of work?
I'm thinking maybe Physicist, math, ME, computer and the like.
I'm thinking maybe Physicist, math, ME, computer and the like.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I'm interested in how you're getting those 60 foot times.
I can't come close there. I can't accelerate the car that fast even if it operates at above peak torque for the first two seconds.
What is your time resolution between calculations?
I can't come close there. I can't accelerate the car that fast even if it operates at above peak torque for the first two seconds.
What is your time resolution between calculations?
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Originally Posted by bmalec
MN... IBM... EE...
I smell AS/400! Oh wait, iSeries. Whoops! Think they're calling it the eServer i5 this week
Sorry, couldn't resist.
Ben
I smell AS/400! Oh wait, iSeries. Whoops! Think they're calling it the eServer i5 this week
Sorry, couldn't resist.
Ben
As far as the 60' times go its an itterative process that asks what you want the 60' time to be and it makes an educated guess as to what the g-force should be. It calculates out the 60' and if it's out of tolerance it adjusts and recalculates. It does this only 5 times due to the fact that it takes a while to run the program. It takes about 2-5 minutes to run depending on your computer speed. Since this is running in Excel you can only imagine the overhead that it generates to slow things down. It would be really easy to make this into a C++ program that would run atleast 10 times faster but I don't currently have access to a development environment.
Last edited by mn_vette; May 17, 2005 at 10:01 AM.