XB4 +2 rear suspension holders

[neallewis]

I've picked up the two +2 rear lower suspension holders today from MB Models.
363311 and 363321. They are shown below compared to the regular kit rear ones.



I've modified (Dremel) the kit RR holder to allow it to be mounted directly to the chassis, as i'd already removed the plastic rear section of the chassis for the ralls racing under-gearbox weight. I ran the car with the dropped gearbox and modified kit hangers on my slippy and it was excellent. Really helped lock in the rear of the car.

I've now got the new optional +2 hangers and they raise the mount points higher/closer to the outdrive by 2mm. really hoping this helps to lock in the rear end more on the slippy stuff with the dripped gearbox. Testing Sunday, will feedback. Anyone else done this yet?

[Pedros20]

I'd done the same as you in the past, but ordered the +2 hangers yesterday morning. Hoping they'll help rear traction at Worksop next weekend.
Fingers crossed

[thorny97]

I got my hangers yesterday, going to run them at worksop and storm valley

[neallewis]

Hmm, loose as a goose today with them on... Certainly didn't do the magic that I thought best part of £40 would ;-)
Ran with the dropped gearbox, centre insert, lower inner show tower, outside hub hole. I went to 4 deg caster and 1 deg anti squat, as well as moving to lower outer ralls racing tower hole, which helped a little. far looser than it was previously however? this is meant to be the xb4 low traction mod?

What effect on roll centre does this mod have? If moving the top ball down raises the roll centre, does moving the bottom pin up lower it?
With moving the gearbox down, and the wishbone pivot location up, do you need to move the top link up a bit also?

[spennyy2k]

Does it actually move the wishbone pivot up above standard or does it just keep in in the stock position when the gearbox is lowered? And moving the pin up raises the roll Centre

[andoiwebb]

I'm a bit confused, as when the gearbox is lowered (the instructions tell you to remove the 2mm plastic plate when the +2 hangers are used) and the +2 hangers are used, is there any difference apart from lowering the camber link? Or is that the idea?

[dale]

Originally Posted by neallewis

Hmm, loose as a goose today with them on... Certainly didn't do the magic that I thought best part of £40 would ;-)
Ran with the dropped gearbox, centre insert, lower inner show tower, outside hub hole. I went to 4 deg caster and 1 deg anti squat, as well as moving to lower outer ralls racing tower hole, which helped a little. far looser than it was previously however? this is meant to be the xb4 low traction mod?

What effect on roll centre does this mod have? If moving the top ball down raises the roll centre, does moving the bottom pin up lower it?
With moving the gearbox down, and the wishbone pivot location up, do you need to move the top link up a bit also?

Raising the pins 2mm will raise the roll-centre quite a lot, so will make the rear loose through the corners.

For maximum rear traction you'd want to lower the diff and lower the pins (sounds like that's how you had it before?). Lowering the diff will give more rear traction on the power due to the extra angle on the driveshafts (it works a bit like anti-squat).

[andoiwebb]

the confusing bit is in the instructions for the kit, it states 'THE +2 HANGERS MUST BE USED WITH THE CHASSIS PLATE REMOVED', thus the rear wishbones mounted at the same height as with the kit hangers. this would mean the gearbox was lower, but wouldn't you want the gearbox raised for low grip?