Chipped shift points charted
Thread Starter
Member
Joined: Mar 2000
Posts: 3,123
Likes: 0
Chipped shift points charted
<IMG SRC="http://im1.shutterfly.com/procserv?si=00002937301920010702035733024.JPG&ps=0 &rx=640&ry=480">
Data was collected running the car wide-open throttle from idle speed to beyond redline for each of the lower 4 gears. Polynomials were used to describe the time to speed function. Time derivatives were taken to obtain acceleration. Charts of this can be seen by clicking on the hyperlinks below. The functions were recast as acceleration vs. speed. A master chart was made. Intersecting points are where gear changes should be made to maximize the average acceleration. Engine speeds at the intersections are listed on the chart. The shift point should be extended a bit to take into account the time it takes for you to shift. The slower you are the more you need to extend.
<A HREF="http://im1.shutterfly.com/procserv?si=00002937301920010702035735647.JPG&ps=0 &rx=640&ry=480">1st Gear Data Chart</A>
<A HREF="http://im1.shutterfly.com/procserv?si=00002937301920010702035738624.JPG&ps=0 &rx=640&ry=480">2nd Gear Data Chart</A>
<A HREF="http://im1.shutterfly.com/procserv?si=00002937301920010702035740853.JPG&ps=0 &rx=640&ry=480">3rd Gear Data Chart</A>
<A HREF="http://im1.shutterfly.com/procserv?si=00002937301920010702043627333.JPG&ps=0 &rx=640&ry=480">4th Gear Data Chart</A>
Data was collected running the car wide-open throttle from idle speed to beyond redline for each of the lower 4 gears. Polynomials were used to describe the time to speed function. Time derivatives were taken to obtain acceleration. Charts of this can be seen by clicking on the hyperlinks below. The functions were recast as acceleration vs. speed. A master chart was made. Intersecting points are where gear changes should be made to maximize the average acceleration. Engine speeds at the intersections are listed on the chart. The shift point should be extended a bit to take into account the time it takes for you to shift. The slower you are the more you need to extend.
<A HREF="http://im1.shutterfly.com/procserv?si=00002937301920010702035735647.JPG&ps=0 &rx=640&ry=480">1st Gear Data Chart</A>
<A HREF="http://im1.shutterfly.com/procserv?si=00002937301920010702035738624.JPG&ps=0 &rx=640&ry=480">2nd Gear Data Chart</A>
<A HREF="http://im1.shutterfly.com/procserv?si=00002937301920010702035740853.JPG&ps=0 &rx=640&ry=480">3rd Gear Data Chart</A>
<A HREF="http://im1.shutterfly.com/procserv?si=00002937301920010702043627333.JPG&ps=0 &rx=640&ry=480">4th Gear Data Chart</A>
Thread
Thread Starter
Forum
Replies
Last Post
Potomac-Greg
Mid Atlantic Discussion
17
Jan 10, 2007 04:59 AM
CBJ
S4 / RS4 (B5 Platform) Discussion
1
Oct 6, 2000 05:15 AM
