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View Full Version : Online Dyno and 1/4 et. runs.


_J_
10-10-2004, 06:41 PM
I have been using the RPM's online Dyno to get pre-race 1/4 ML. runs,
and so far it seem very good, however I like to know if anyone have a
better web-site with est. Vehicle Weight and other options to use for a better
1/4 et. Results, I know there is nothing like the real deal but it does help.


http://www.aspracing.com/dyno.htm

e.g..
Vehicle Weight+You+Gas.: 4,200 lb
1/4 Ml. Trap Speed.....: 125MPH
est. RW Horsepower.....: 640 RWHP


Vehicle Weight+You+Gas.: 3,800 lb
Rear Wheel Horsepower..: 512 RWHP
Estimated E.T (sec.)...: 11.3

Vehicle Weight+You+Gas.: 3,800 lb
Rear Wheel Horsepower..: 450 RWHP
Estimated E.T (sec.)...: 11.8

Vehicle Weight+You+Gas.: 3,800 lb
Rear Wheel Horsepower..: 350 RWHP
Estimated E.T (sec.)...: 12.9

so if you are making 450+ RWHP, you can run 11's :rockongoo

and if you do not then go to MM for help :)
Blown5Pnt4
10-10-2004, 06:47 PM
I wouldnt go by that thing at all....it said I have 468rwhp for me to run my 107mph....On a dyno I made 375rwhp its only somewhat accurate if you use my torque rating which I made 460...
CraZee ZO6
10-10-2004, 06:50 PM
For me

I got 10.64 at 128.06
Thats with 500rwhp. It doesnt factor tq?
_J_
10-10-2004, 06:51 PM
I wouldnt go by that thing at all....it said I have 468rwhp for me to run my 107mph....On a dyno I made 375rwhp its only somewhat accurate if you use my torque rating which I made 460...

yes, you are right..

that is why I needed to fine another .. but it still seems ok..
Peter
10-10-2004, 06:51 PM
I like www.prestage.com





Pete :rockongoo
Peter
10-10-2004, 06:53 PM
For me

I got 10.64 at 128.06
Thats with 500rwhp. It doesnt factor tq?


Torque does not figure into ET.



Pete
_J_
10-10-2004, 06:55 PM
I like www.prestage.com

Pete :rockongoo

very nice..

more detail..

http://www.prestage.com/community/Car+Math/ET+and+Horsepower+Calculators/default.aspx
_J_
10-10-2004, 06:56 PM
Torque does not figure into ET.

Pete


? why not?
Peter
10-10-2004, 06:57 PM
very nice..

more detail..

http://www.prestage.com/community/Car+Math/ET+and+Horsepower+Calculators/default.aspx


With all of these calculators, you can add about 5mph if you have a poweradder.

Pete
_J_
10-10-2004, 06:58 PM
With all of these calculators, you can add about 5mph if you have a poweradder.

Pete


Nice... Thanks
Peter
10-10-2004, 07:01 PM
? why not?


It's been explained to me, but I still am puzzled myself, but all these calculators use HP and Weight of the vehicle. I got 11.80 @ 120 :rockongoo

Pete
_J_
10-10-2004, 07:02 PM
It's been explained to me, but I still am puzzled myself, but all these calculators use HP and Weight of the vehicle.

Pete


very true... Thanks..
CraZee ZO6
10-10-2004, 07:17 PM
Using Pete's posted site..

I got

10.64
128.14

SIMILAR to the one above.
Peter
10-10-2004, 07:19 PM
Using Pete's posted site..

I got

10.64
128.14

SIMILAR to the one above.


Those numbers are for a drag race setup, your setup would not even be close.

Pete
CraZee ZO6
10-10-2004, 07:24 PM
Those numbers are for a drag race setup, your setup would not even be close.

Pete

Really? I thought I could easily run 10s with my 19's... :laugter-
Peter
10-10-2004, 07:26 PM
Really? I thought I could easily run 10s with my 19's... :laugter-


Yeah in 8's....... :lolgood:



Pete
Blown5Pnt4
10-10-2004, 07:26 PM
Pete, I dont understand how it doesnt figure into ET at all...Especcially when you look at my truck...without the torque i make..I go NOWHERE. lol
_J_
10-10-2004, 07:27 PM
Those numbers are for a drag race setup, your setup would not even be close.

Pete


What about the skills of the driver? And the transmission used? 4, 5speed 6speed?

Keep in mine that the Vehicle Weight + gas + you are actual numbers, and your RWHP
Is also actual, so why can’t I (anyone) get that number. :)
Peter
10-10-2004, 07:28 PM
Pete, I dont understand how it doesnt figure into ET at all...Especcially when you look at my truck...without the torque i make..I go NOWHERE. lol


I know, but that's the deal, I would think that TQ would help a heavy car or super heavy truck like yours to get down the track.


Pete
CraZee ZO6
10-10-2004, 07:28 PM
Josh I wouldnt rely on these calculators. Lots of other factors come into play LIKE TQ, aerodynamics, what kind of tires.

Its just a good tool for a estimation.
Peter
10-10-2004, 07:30 PM
What about the skills of the driver? And the transmission used? 4, 5speed 6speed?

Keep in mine that the Vehicle Weight + gas + you are actual numbers, and your RWHP
Is also actual, so why can’t I (anyone) get that number. :)


That number is an ideal run with a drag race setup, probably a prepped automatic with ideal matched rearend gears.

Pete :eusa_danc
Blown5Pnt4
10-10-2004, 07:31 PM
Josh I wouldnt rely on these calculators. Lots of other factors come into play LIKE TQ, aerodynamics, what kind of tires.

Its just a good tool for a estimation.
oh I dont....I just am actually curious about this now. I never heard that torque doesnt figure into ET...I'd like to hear the explanation of why in detail if anyone can give it.
Peter
10-10-2004, 07:32 PM
Josh I wouldnt rely on these calculators. Lots of other factors come into play LIKE TQ, aerodynamics, what kind of tires.

Its just a good tool for a estimation.


It's just a guidline for a well matched setup and good driving, TQ really does not figure in.

Pete
Peter
10-10-2004, 07:36 PM
oh I dont....I just am actually curious about this now. I never heard that torque doesnt figure into ET...I'd like to hear the explanation of why in detail if anyone can give it.




Here.....LOL

http://www.physics.uoguelph.ca/tutorials/torque/Q.torque.intro.html
Blown5Pnt4
10-10-2004, 07:37 PM
thanks pete.
_J_
10-10-2004, 07:38 PM
That number is an ideal run with a drag race setup, probably a prepped automatic with ideal matched rearend gears.

Pete :eusa_danc


I See .. Thanks

Now I know what to do :rockongoo
Peter
10-10-2004, 07:38 PM
Actually someone once told me HP is how hard you hit the wall, Torque is how far you move the wall.



Pete :rockongoo
_J_
10-10-2004, 07:50 PM
Here.....LOL

http://www.physics.uoguelph.ca/tutorials/torque/Q.torque.intro.html

After reading this, I now thing TQ. is needed, :eusa_thin

because to move Weight over distant needs TQ.. :shruggood

what if there was No Tq.
Does this mean you cannot start the moving motion before needing HP?
Peter
10-10-2004, 07:53 PM
After reading this, I now thing TQ. is needed, :eusa_thin

because to move Weight over distant needs TQ.. :shruggood

what if there was No Tq.
Does this mean you cannot start the moving motion before needing HP?


See what I mean, it gets more baffling!

Pete
Ruckus99SS
10-10-2004, 08:17 PM
every calc i just did said i should run a 14.2-14.0...i'm ruuning a 13.9 so i guess i'm doing ok but thats kind of depressing, i have been hoping to break into the mid 13.5's. My car weights 3,510 so maybe i'll try dropping some weight for next time to the track. I'm thinking about going sunday again maybe i'll take out my back seat, spare,jack, and back carboard carpet thing.
Peter
10-10-2004, 08:21 PM
every calc i just did said i should run a 14.2-14.0...i'm ruuning a 13.9 so i guess i'm doing ok but thats kind of depressing, i have been hoping to break into the mid 13.5's. My car weights 3,510 so maybe i'll try dropping some weight for next time to the track. I'm thinking about going sunday again maybe i'll take out my back seat, spare,jack, and back carboard carpet thing.


Which probably means you are making more power than you dynoed or the car weighs less than you put in the calc.


Pete :eusa_thin
Ruckus99SS
10-10-2004, 08:34 PM
nope it weights 3510 as of sat when...went on the scale at etown after my last run
_J_
10-10-2004, 09:43 PM
nope it weights 3510 as of sat when...went on the scale at etown after my last run

pete so what does this mean? :shruggood

If he can get his info. somewhat to match, why can't I

550+ RWHP run 10's

450+ RWHP run 11's

I guest he is just a better driver.. :bowdowngo
Ruckus99SS
10-10-2004, 09:45 PM
i doubt thats teh case...i've only ran at the track 4 times now.....this sunday will be 5
Ruckus99SS
10-10-2004, 09:48 PM
one thing i dont get about those calcs is how do they judge your 60'. do they do it on like an average or what? I know my car does 13.9 with a 2.0 60 but what if i lowered it then that would even mess up the thing more or if i ran a higher 60 then i would be right on there mark
_J_
10-10-2004, 09:50 PM
Which probably means you are making more power than you dynoed or the car weighs less than you put in the calc.


Pete :eusa_thin


This is from: aspracing.com

"Note that the elapse time is the approximate time your vehicle should be running.

Although many factors influence elapse time the main factor is traction. Usually if your vehicle does not have enough traction your elpase time will be higher than the estimated.

The other extreme is also possible and usually occurs when you are using racing slick tires.

The horsepower calculation is correct by the definition of horsepower. Horsepower is a measure of the force required to accelerate a weight to a known speed in a know distance. So the generate horsepower by this calculator is the actual horsepower at the rear wheels."