Slim 2

[jimmy]

I guess a few people do already though. I know I do.
The latest cells are for 4wd and the old ones for 2wd.

[Northy]

Originally Posted by PaulRotheram

All the weight towards the rear, cells + motor could make the car handle bad when traction is low as it could make the car want to 'swing' more.

As opposed to the motor hanging out of the back Paul!

G

[super__dan]

I don't think there is actually that much weight differece balace front to rear between the two, but Apec B looks more balanced side to side and the fact the cells are same config as 4wd surely would appeal to more people.

Dan

[jimmy]

Witht he X6 dan, do you find tho it might not have as much weight over the rear that the slide is easier to control ? or ?

[super__dan]

Would the motor have to run in reverse on Spec B?

[Northy]

He's ignoring you Jimmy!

G

[Northy]

Originally Posted by super__dan

Would the motor have to run in reverse on Spec B?

Dan, couldn't you just turn the diff round?

G

[Southwell]

That would work, but with the diffs being the wrong way round arn't they susseptable to loosening?

[jimmy]

you can on some shaft boxes (ooer) but the tc3 gearbox is moulded for one way around so you cant swap the diff round.
Wonder if you could stick it upside down.

but you are right G, he basically blanked me there!

[Northy]

Originally Posted by Southwell

That would work, but with the diffs being the wrong way round arn't they susseptable to loosening?

Ian,

When you build your Pred you'll see that the two diffs are different ways round, if they're tight (thread locked) they're fine.

If you think about it, if they were the same way the car would try and pull itself apart, or shortern itself!

G

[Northy]

Originally Posted by jimmy

but you are right G, he basically blanked me there!

I love it when I'm right!

G

[OldTimer]

I have raced the Spec B car at a regional and it was very good indeed, i came up with the Spec B car as you find that you get torque steer with spec A as a lot of the weight is over one side.

The spec B car is very well balanced, and fly's extremely well, the rear gearbox is mounted upside down so there is no need to adjust motors etc, with both cars there is a need for a little more weight towards the rear, the spec B car corners like a 4wd and can carry a lot higher cornering speed than a normal 2wd.

Things i need to work on are, better slipper adjustment: As with any mid car when you go on a low grip area it shows up a lot more than a normal 2wd, i would guess the X6 guys would of noticed this.

Alternative front end: maybe a option to use the B4 still looking into this, but this would then make the front and rear ends AE.

Tub chassis: with some different machining of the S4 blank chassis this could be used, this would elimante the need for a top deck.

[Southwell]

Originally Posted by Northy

Ian,

When you build your Pred you'll see that the two diffs are different ways round, if they're tight (thread locked) they're fine.

If you think about it, if they were the same way the car would try and pull itself apart, or shortern itself!

G

Aye, i was more refering the b4's and xxx's, as they can loosen if their on the wrong way..

Ive seen someone do that to a pred XK5, gearboxes obliterated themselves :eek: :bom:

[Southwell]

I would have thought more people would prefere B4 parts, being as more people run b4's.

[PaulRotheram]

Originally Posted by Northy

As opposed to the motor hanging out of the back Paul!

G

It depends.. but it is only my view. ill admit im not the most engineering mindly based person, far from it but if all the weight is toward to rear end then wouldnt that make it worse than having 1 motor hanging out the back and cells laying centralised with elecs side by side?

i don't mind if i'm wrong, this stuff just interests me

[Northy]

I don't know to be honest, all I know is that from what I have seen the mid motor cars struggle for traction in low grip conditions. A quick fix for that would be more weight to the rear, but it might not be the correct fix.....

G

[Chris Doughty]

mid motor cars you will find they might snatch loose grip, but on the flipside they will also regain their grip after a slide, there is not so much pendulum motion going on.

also, you can turn in harder into the corner because you don't have to worry about your motor on the trailer at the back trying to overtake the front end coming into a corner. this can work as a counter productive behaviour though, if the grip is low and you want to hand bag it into hairpins.

the closer the heavy bits are to the CoG, the less inertia they pick up when the car is moving/sliding/jumping so the easier it is to stop that motion.

as with most things, this can be a good thing and a bad thing, and this is the reason for the snap loss of grip, but also the snap re-gain of grip.

when I say 'snap' loss of grip, I don't mean blink and the car is facing the wrong way, you have to drive it/see it to get my drift (like that ) properly

[BenG]

Hows the S2 coming along?