So their are 3 different radius rods available for the SH

The service manual says nothing about which one does what. It just says that they are different in length by 2.5mm and that it can correct for caster being slightly off.

So if you wanted to increase caster which one would you buy? The " + " radius rod, believing that the + stands for increasing caster?

Or do you buy the " - " believing that since the arm is shorter by 2.5mm that would make the caster larger than what it was (the shorter arm would force the wheel further forward)?

 

I believe the 2.5mm diff between each of the colored radius rods is .5 degree change in caster. -2.5mm would decrease the caster by .5* and vice versa. btw, which side radius rod do you need and does it need to increase or decrease caster for your situation?

 

I need to increase the caster on the right. At first I had the same thought as you. Then I realized if you decrease the rod length (-2.5mm) it would move the LCA more forward, thus increaseing the caster?

I could be wroung though.

 

you can always add more washers where the radius rods meet the crossmember (i think) to add/reduce caster. Tire shops do it often, i'm told.

 

I wish it were that easy. On an SH you can't do that. It's times like these I wish I had bought a base prelude. Stupid car keeps throwing codes and disabling the ATTS anyway.

 

just be glad your car isn't a dime a dozen

 

The SH radius rod is actually a better design, since it only allows vertical movement of the arm. If you need to increase caster, you do need -2.5mm to pull the lca forward, thus increasing the angle between it and the uca. You want the radius rod with white color coded dot. Straight from helms.

 

Be aware that increasing the caster beyond the stock spec will adversly affect bump steer. The outer tie rod end will be too low causing the wheel to toe in in bump.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RaceCity_USA &raquo;</TD></TR><TR><TD CLASS="quote">Be aware that increasing the caster beyond the stock spec will adversly affect bump steer. The outer tie rod end will be too low causing the wheel to toe in in bump.</TD></TR></TABLE>

Thanks for the info. Right now I am just trying to get it back to "normal" I'll post the results if I get it fixed later.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vinuneuro &raquo;</TD></TR><TR><TD CLASS="quote">The SH radius rod is actually a better design, since it only allows vertical movement of the arm. If you need to increase caster, you do need -2.5mm to pull the lca forward, thus increasing the angle between it and the uca. You want the radius rod with white color coded dot. Straight from helms.</TD></TR></TABLE>

I just verified this, you need the - rod to increase the caster. Thanks