Guys, I've been tinkering on an excel based drag strip model for years that estimates 1/4 mile ET and trap speed based on a lot of factors. I have continuously evolved the model and made it more complex and hence more accurate as time has gone on, and now I want to add something that is complicated for me. I can't figure out how to do subscript and superscript in this forum so here's a link to a place that you can see the equations I used:
General Physics Forum
And by the way, here's an example of the models results compared to a recent trip to the drag strip in my car. The actual run was a
60': 2.24
1/4 ET: 13.35
1/4 Trap: 105.49
All of the highlighted cells are inputs. The Bore & Stroke vs. displacement calculator is just an unrelated tool that I added into this spreadsheet. The first tab allows you to set the gear ratios and shift points. The 2nd tab allows you to input factors relating to weight, mass, aerodynamics, shift time, expected 60' time, and average torque output in each gear. I'm beginning to fiddle with mass moments of inertia, and I don't think it's having the effect it should. I've always hear that 10lbs of rotating mass = 100lbs of regular mass = 10hp = .1 second = 1mph trap speed. However, reducing 10 lbs from my front wheel mass is only impacting the outcome by around .015s@.19mph. Seems like it should be more.
So, if you're interested in this stuff and good at calculating dynamics or physical formulas, please take a look at the link.
Thanks,
Chris
General Physics Forum
And by the way, here's an example of the models results compared to a recent trip to the drag strip in my car. The actual run was a
60': 2.24
1/4 ET: 13.35
1/4 Trap: 105.49
All of the highlighted cells are inputs. The Bore & Stroke vs. displacement calculator is just an unrelated tool that I added into this spreadsheet. The first tab allows you to set the gear ratios and shift points. The 2nd tab allows you to input factors relating to weight, mass, aerodynamics, shift time, expected 60' time, and average torque output in each gear. I'm beginning to fiddle with mass moments of inertia, and I don't think it's having the effect it should. I've always hear that 10lbs of rotating mass = 100lbs of regular mass = 10hp = .1 second = 1mph trap speed. However, reducing 10 lbs from my front wheel mass is only impacting the outcome by around .015s@.19mph. Seems like it should be more.
So, if you're interested in this stuff and good at calculating dynamics or physical formulas, please take a look at the link.
Thanks,
Chris