Please explain some common roadrace/autocross terms...
Thread Starter
Joined: Apr 2001
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From: Northwest Tri Cities Kennewick, WA, USA
Please explain some common roadrace/autocross terms...
Ok, I am slightly lost when reading some archived posts that do deeply into suspension theory, and the like. If you could please volunteer some information and or words and explanations that seem common to you but might be uncommon to people like me. For example:
What is bump steer? Static vs. Dynamic.
Please school me, I am new to the world of real racing, I come from the world where everyone buys the parts they read about in magazines
.
What is bump steer? Static vs. Dynamic.
Please school me, I am new to the world of real racing, I come from the world where everyone buys the parts they read about in magazines
.
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From: RIP Craig Jones
Re: Please explain some common roadrace/autocross terms... (Hondaddict)
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From: MA
Re: Please explain some common roadrace/autocross terms... (Hondaddict)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hondaddict »</TD></TR><TR><TD CLASS="quote">Ok, I am slightly lost when reading some archived posts that do deeply into suspension theory, and the like. If you could please volunteer some information and or words and explanations that seem common to you but might be uncommon to people like me. For example:
What is bump steer? Static vs. Dynamic.
Please school me, I am new to the world of real racing, I come from the world where everyone buys the parts they read about in magazines .</TD></TR></TABLE>
bump steer is only dynamic as it refers to a change in steering angle as the suspension moves. ie, as you compress your front suspension, the tires toe out or in. that change in toe is called bump steer. your static toe setting is a seperate element that is affected by bumpsteer as your car encounters bumps or corners.
bumpsteer is important because large amounts of bumpsteer (large steering angle change with small wheel deflections) makes for a car that is darty. also, bumpsteer affects how the car handles. toe-in bumpsteer makes for added corner entry rotation. toe-out bumpsteer has the opposite affect.
"i can't change my suspension geometry to change my bumpsteer, so what good is this information?" yes, you can change your amount of bumpsteer. typically there is a bumpsteer curve, similar to a camber curve. on h/a cars, this bumpsteer curve is mainly ride height dependant, (only because most classes limit what you can change in your suspension geometry. there are bumpsteer kits on the market that allow you to reduce the amount of bumpsteer your particular suspesion type has) and generally speaking gets steeper as you go lower. extreme lowering of your car will get you further into the steeper portion of the bumpsteer curve then if it weren't so low. this can cause your car to be darty and not turn well at corner entry. particularly if you utilize large amounts of toe-out static. of course, there are many other factors to consider too, so don't get too wrapped up in just one factor.
nate
What is bump steer? Static vs. Dynamic.
Please school me, I am new to the world of real racing, I come from the world where everyone buys the parts they read about in magazines
.</TD></TR></TABLE>bump steer is only dynamic as it refers to a change in steering angle as the suspension moves. ie, as you compress your front suspension, the tires toe out or in. that change in toe is called bump steer. your static toe setting is a seperate element that is affected by bumpsteer as your car encounters bumps or corners.
bumpsteer is important because large amounts of bumpsteer (large steering angle change with small wheel deflections) makes for a car that is darty. also, bumpsteer affects how the car handles. toe-in bumpsteer makes for added corner entry rotation. toe-out bumpsteer has the opposite affect.
"i can't change my suspension geometry to change my bumpsteer, so what good is this information?" yes, you can change your amount of bumpsteer. typically there is a bumpsteer curve, similar to a camber curve. on h/a cars, this bumpsteer curve is mainly ride height dependant, (only because most classes limit what you can change in your suspension geometry. there are bumpsteer kits on the market that allow you to reduce the amount of bumpsteer your particular suspesion type has) and generally speaking gets steeper as you go lower. extreme lowering of your car will get you further into the steeper portion of the bumpsteer curve then if it weren't so low. this can cause your car to be darty and not turn well at corner entry. particularly if you utilize large amounts of toe-out static. of course, there are many other factors to consider too, so don't get too wrapped up in just one factor.
nate
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