Ride height - Tarmac car

[sam JFM]

Im looking at setting my car up next weekend but i am not sure where to start ride height wise.
Any ideas?

 

[NorthloopCup]

Im looking at setting my car up next weekend but i am not sure where to start ride height wise.
Any ideas?

What suspension are you using? If it's cup racer stuff you'll be able to go pretty low before you hit any issues, but if it's on normal 1*2 hubs you'll run into roll centre issues pretty fast!

 

[sam JFM]

It's standard 172 hubs, I'm not after silly low as I will need travel.

 

[NorthloopCup]

It's standard 172 hubs, I'm not after silly low as I will need travel.

In that case drop it about 25mm from standard ride height, but no more. It will be a good compromise between keeping travel and not getting the roll centres in a mess.
What suspension/coilovers are you running out of interest?

 

[sam JFM]

Leda's front and rear - Standard spring location on the back

 

[sam JFM]

Update to this:

Now i have the front roll center correctors whats going to be the best height for the new hubs?

 

[NorthloopCup]

Update to this:

Now i have the front roll center correctors whats going to be the best height for the new hubs?

You can go 30-40mm lower immediately with these fitted.

 

[Faboka]

Update to this:

Now i have the front roll center correctors whats going to be the best height for the new hubs?

Where did you get these from?

 

[sam JFM]

Where did you get these from?

Group buy mate, it's finished now but I think they are going to do another

 

[Faboka]

Thanks

 

[NorthloopCup]

Where did you get these from?

You need to be a member to see the group buy section mate. There will be about her gb around late March/early April.

 

[adamlstr]

NorthloopCup So a 1*2 on standard hubs, what kind of angle should the wishbones sit at? I've had my B14's fitted a while and the chaps that fit them just wound them right down.

 

[NorthloopCup]

@NorthloopCup So a 1*2 on standard hubs, what kind of angle should the wishbones sit at? I've had my B14's fitted a while and the chaps that fit them just wound them right down.

In a perfect world the wishbones need to be sloping down from the subframe to where they locate in the bottom of the hub, as in centreline of the securing bolt to the centreline of the bottom ball joint pivot. You can run them parallel with the ground though. Is your car as low as it is in your avatar or lower?

 

[adamlstr]

In a perfect world the wishbones need to be sloping down from the subframe to where they locate in the bottom of the hub, as in centreline of the securing bolt to the centreline of the bottom ball joint pivot. You can run them parallel with the ground though. Is your car as low as it is in your avatar or lower?

Nah, avatar is on 16's and Eibachs.

It's now 15's and B14s.

Going to be fitting new wishbones once the weather clears and want to raise the front up, I haven't even looked to see what angle the arms are currently at!

 

[Faboka]

You need to be a member to see the group buy section mate. There will be about her gb around late March/early April.

Thanks. Could be tempted for these.

 

[NorthloopCup]

Nah, avatar is on 16's and Eibachs.

It's now 15's and B14s.

Going to be fitting new wishbones once the weather clears and want to raise the front up, I haven't even looked to see what angle the arms are currently at!

Looks well that! Do the driveshafts hit the chassis leg on track?

Thanks. Could be tempted for these.

Ok mate, no problem.

 

[adamlstr]

Looks well that! Do the driveshafts hit the chassis leg on track?

Don't know yet ! Can't track it currently, the NSF bushes are SO bollocksed.

 

[NorthloopCup]

Don't know yet ! Can't track it currently, the NSF bushes are SO b****cksed.

I'd imagine they will be very close to the legs mate, and if the springs are reasonably soft on the B14's it will deffo catch under hard cornering.

 

[mikeh]

So driveshafts hitting the subframe is an issue?

This concerns me, although I'd have thought I'd have found it by now driving like a knob with softish standard dampers on what are quite possibly the worst roads in the UK.

I left my ASTs I just purchased at the height they were already adjusted to - it's pretty low. That said, they are pretty damned hard, too.

 

[NorthloopCup]

So driveshafts hitting the subframe is an issue?

This concerns me, although I'd have thought I'd have found it by now driving like a knob with softish standard dampers on what are quite possibly the worst roads in the UK.

I left my ASTs I just purchased at the height they were already adjusted to - it's pretty low. That said, they are pretty damned hard, too.

Chassis legs mate - not subframe. You've got to be very very low at the front though. Mine was doing it one year when I was at the nurburgring.
Whats your Ast spring rates? My kw's that were fitted were 60n, so about 335lbs. Too soft by a country mile for track work.

 

[mikeh]

According to AST:
Spring Rate (Track)80nm / 90 nm , 456lb / 513 lb

It's pretty low..

 

[NorthloopCup]

According to AST:
Spring Rate (Track)80nm / 90 nm , 456lb / 513 lb

It's pretty low..

Yeah you should be alright then tbh as movement is not so much with those spring rates. Mines quite a bit lower than yours as well, but I have the front roll centres corrected so I can get away with it.

 

[mikeh]

The roll centre kit is something I desperately want to do.

It's a battle against ITBs and a diff, though (primarily the latter).

 

[NorthloopCup]

The roll centre kit is something I desperately want to do.

It's a battle against ITBs and a diff, though (primarily the latter).

Gripper? Do you want a different cw&p?

 

[mikeh]

Yeah, the plan was Gripper.

I'm torn on the CW, as I use the car for Autosolos, too.

My head says stick with the gearing that I know I've been able to make work for me so far, but done right (with a bit more low down torque), I could potentially move my whole run (bar launch) into 2nd gear which would be a huge plus point. I reckon removing the bulk of gear changes has got to be worth at least half a second (over ~60)!

 

[NorthloopCup]

Yeah, the plan was Gripper.

I'm torn on the CW, as I use the car for Autosolos, too.

My head says stick with the gearing that I know I've been able to make work for me so far, but done right (with a bit more low down torque), I could potentially move my whole run (bar launch) into 2nd gear which would be a huge plus point. I reckon removing the bulk of gear changes has got to be worth at least half a second (over ~60)!

So is it road use and autosolos? Or something else?
Your biggest improvements will come from correct suspension geo and a diff tbh mate.

 

[mikeh]

It has no use on the road, beyond driving to track days until I stump up for a trailer.

I'm looking forward to see how the car fairs with the new suspension in the autosolos - on standard suspension, even with -3 degrees front camber I was still rolling over on the inside wheel. Hopefully the stiffer setup should help that massively.

The diff is the biggest thing, I think - its a big investment, though. Especially if I want a crown wheel.

 

[NorthloopCup]

It has no use on the road, beyond driving to track days until I stump up for a trailer.

I'm looking forward to see how the car fairs with the new suspension in the autosolos - on standard suspension, even with -3 degrees front camber I was still rolling over on the inside wheel. Hopefully the stiffer setup should help that massively.

The diff is the biggest thing, I think - its a big investment, though. Especially if I want a crown wheel.

You will definitely see an improvement from the ast's mate.

Diffs ain't so bad if you know where to go.
YHPM

 

[sam JFM]

You can go 30-40mm lower immediately with these fitted.

30-40 lower than standard?

 

[NorthloopCup]

30-40 lower than standard?

Yes mate.