desertracerdad

iTrader: (101)

The flat/rear arms UM521, UM521-1 or UM566 work best on higher traction layouts. They lock the rear end in more and provide a more consistent feel in corners. If you do have a track where you can run these, make sure to use the medium rear shock eyelets so you can achieve the correct amount of droop & ride height. Also, you will only have 1mm of spacing between the arm and rear suspension holders (not 2mm like the kit UM713 arms). I tested in front & behind the arm and for 17.5 & 13.5, prefer the 1mm behind the arms (which is to the rear bumper).

Difference between the above three rear arms is:
UM521 = 2 hole Rr arm with RB5 SP Fr arms
UM521-1 = 1 hole Rr arm with RB5 SP2 Fr arms
UM566 = 2 hole Rr arm (same rear as UM521) with RB5 SP2-WC Fr arms

Cpt.America

iTrader: (52)

Yep.. im not sure that is right (did i post that? *blush*). At 30 caster I rum 3mm bumpsteer. Its 0mm bump at 25 caster, and 3mm bump at 30 caster. Split it up for your incriments for 26, 27, 28, and 29. I measure on a setup station, or with a metric ruler.

OMG23RC

iTrader: (21)

guys are there any special tips for making the big bores more smooth when building them?

B00t13g

iTrader: (9)

You would make me do the math lol. What setup station are you using?

Cpt.America

iTrader: (52)

Hudy.

joeymdz

iTrader: (13)

Played around with my caster 25/-4 and wow.. Insane steering!! I liked it over 30/-4 as it had more aggressive response to on and off power. Im running a slightly modified tbo setup

B00t13g

iTrader: (9)

At 25=0 at 25+2= 1.2 at 25+4= 2.4

Does that sound correct?

silvalis

iTrader: (29)

Follow the instructions when bleeding? I've never had to do anything special. Were you having issues, or just curious?

srs70

Must say I am very Impressed.... I got my RB6 Thursday night ... Proceeded to have a wrenching session Thursday and Friday night.. went to the track Saturday was TQ with some very tuff guy's running. Lost TQ in the 3rd round and ended up 2nd in the main!! Long time AE guy and now asking why.. This car rocks !!

ChadBlanton

iTrader: (1)

Are you using the negatives to say that you're running the caster inserts backwards? I'm still trying to figure out the caster. I'm running 25/4 and I have a little too much turn in and the car seems to over rotate in the infield....

Cpt.America

iTrader: (52)

Ill trust your math It doesn't need to be dead smack on... only close. If you are good at eyeballing toe.. you can just eyeball it. The easy way, is to measure with a ruler just like measuring static toe.

Cpt.America

iTrader: (52)

You're running 21 caster? That would be ultra sensitive in the infield.... and you might be lacking some in the faster sections. I am back to 25/2, and am in heaven. Went up in shock oil last night, and the car has never been better.



25/4 is where you want to be then... It will give you the tamest infield steering, with the least amount of pro-dive. Over-rotating in the infield sounds like a tire issue, or a static weight balance issue... without seeing a detailed setup sheet. Post the rest of your setup, and we can help you get that sorted out.

B00t13g

iTrader: (9)

I went to 25/0 and it's better, but I'm needing more steering after entry and was thinking 2 degree inserts would be the ticket as well. Ill have to try that when I get my car back. What bump steer are you running?

ryanpatrickgore

iTrader: (14)

I am running 25/2 and I am really liking it as well. Came from 30* and this is a bit more aggressive, my car is feeling great!

Cpt.America

iTrader: (52)

Mid corner, I would start with roll center. Keep the same number of shims, but move your inner link inwards to the middle hole to start.