Loose rear
 

Hi all, i'm running my BX with the one piece chassis and Bradders rear shock mount but i'm having difficulty indoors with rear grip. The shocks are kit Yoke with Associated No.1 pistons and black springs. I have tried the different Yokomo springs but reverted back the the black. I raced last night, the track is carpet and shiny floor, the rear end was much more stable but still not quite right. I currently have 30wt oil in but have tried 25.

Any help appreciated,

Neil.

Hey Neil,
It really is hard to get help with this car eh, especially when you are one of three people in your country with one, as is my case.

You are probably more qualified than I to answer, but as you asked for help here goes:

Question is, where is it loose?

Initial turn in: more angle in rear camber link or less in front

Mid corner: Longer rear link or shorter front, less internal spacers in rear shocks, more in front

Exit: Not really sure, usually on power so try...

On power: Less anti squat in rear, worse jumping though

Overall: Different Tyre Pattern/compound/Insert; Softer rear spring; Move top of shock out if loose during cornering on smooth track, or inwards if the rear is thrown up and loose over bumps; also more toe in if you are running 0.5 degree hubs go back to standard.

Hope that helps a little!

Also make sure it is not the front hooking the rear around, else you would do better to lose some front grip if you have plenty of steering, rather than working on the rear. Cutting outer row of tyre spikes does this, or different tyres.

Are you running the longer rear shafts to match the taller rear tower?
If not, then lack of rear droop probably not helping.

Thanks for the comments guys, Gaz i am running the longer shock shafts.:)

Neil

I posted something like this a while a go on racechat about my touring car.

Anyway, after going through my setup etc... it got on to a discussion about getting the balance of the car right. So, I ended up leaving the rear of the car alone and adjusting the front end. By removing some of the front end grip it made the car much more balanced and easier to drive.

Just a thought…..


Brett

Hi Brett,

Thats something i hadn't thought of but definitely worth a try i'll have a play around in the morning, see you there.

Neil.

The car was far, far better today the new wing transformed it's handling so i think i might have cracked it. Thanks to the many people who has listened to my moans both on here and at trackside. ;)

What shafts are you running with the shock tower modification? I just ordered the shock towers, but I was not sure how much longer the shafts need to be.

They are 49.6 mm.

Thanks
 

Which shafts are you using? Associated?

No, Yokomo.

Have you got a part number for these.
Thanks

Yep, i should have posted the part number earlier, anyway here it is YS-5L-2T

Thanks for that.

No worries.:)

O.k just orderd some of these form my LHS and they are on back order from CML:( . Any body know where i can get some from:confused:

RC Champ in Japan, i ordered some bits on Thursday and they arrived today.

Email [email protected] and put it FAO Masa, BX parts. Masa speaks perfect English and is mega helpful plus you won't get the parts cheaper anywhere else.

Will do. Thanks for the help.

The email adress is champ_ but it doesn't seem to show up there.

I also use RC Champ, and have ordered loads of BX parts from Masa.

very fast shipment to the UK :)

The delivery times are so quick it's unreal, they give the best service i've had when ordering online.

source for YS-5L-2T shafts
 

I have tried Yokomo USA, RC Champ, several other online suppliers but no one has these in stock. Does anyone have a line on some? Or know what other manufacturer's shafts would work? Thanks for any suggestions.

Are these shock shafts for the BX? If so look in the new products link on Yokomo USA'a web site.......

use assoc 1.02" shafts. they are .8mm longer i think. very close anyway.

Associated vs Yokomo Shafts
 

Associated shafts are smaller in diameter. Has anyone tried them? Do they seal ok? These are the longer than stock rear BX shafts for use with the modified shock mount.

actually they're slightly wider in diameter. got them on mine. no problems at all except its a bit tight getting on the piston..

A/E shafts are about 2.5mm in diameter vs Yokomo's 2mm. Kyosho make a 50mm long shaft that is 2mm dia. from the RB5 rear shocks. It should fit fine.