Springs and anti-roll bars serve different, yet related purposes. For the uneven roads I need to traverse, overly stiff anti-roll bars can upset the chassis by linking the two sides together in a way that inhibits independent action.

Suspension setup for road cars is always a compromise.

 

[QUOTE=StealthPilot;1241314]Yeah but again, looking at your garage, you don't seem to have a benchmark for stable high speed cornering.[QUOTE]

My garage today has nothing to do with my garage of the recent past, which has included 3 M3s from 3 generations with upgraded suspensions, two Z06s of two different generations, a 1965 Shelby Cobra 427SC replica built to comp specs, and a Lotus Elise, with track time in each.

 

To be fair my parts list only goes up to Oct. 2013 so only the earliest F-Types are in there, V8S convertible and the V6 convertible. Could be that new bars were used on the coupes or the R ?

In any case, it shows the following for the F-Type;

Front bar, same for V8 & V6, same as the X150 XK & XKR
(and XKR-S, except for the XKR-S GT)

Rear bar, same for V8 & V6, same as the X150 XK & XKR
(the XKR-S and XKR-S GT have different rears)

Cross referencing to other models shows that the XKR-S GT has the same front bar as some of the XF's. Since the F-Type front bars are same as the XK's, then the special Korean XF front bar should also fit the F-Type.

The stock front bars are 31/32mm hollow, the Korean one is 32mm solid!

On the rear, the XFR-S has the same rear bar as the XKR-S, so it should also fit the F-Type.

The stock rear bars are varying thickness depending on the part/model, 16mm, 17mm, 19mm, all solid bars. The Korean one is 20mm solid.

That's about as detailed spec as we have at the moment, no stiffness measurements or even comparisons about which OEM ones are stiffer.

From the OEM side i would guess that the XFR-S front bar and the 2008 XKR-S rear bar are the stiffest ones. I can confidently state that for the rear since it's 19mm and the others are 16/17mm. For the front it's a best guess.

But without doubt the Korean ones will be the stiffest you'll get, especially the front.

 

Solid bars aren't significantly stiffer than hollow bars. The center of the bar adds practically nothing when it comes to torsional strength. Most people (myself included) prefer hollow bars because they weigh less.

 

True, but they will fail with lower torsional loads and are more subject to fatigue failure. Still, I too prefer the hollow "bars" since failure does not pose a catastrophic event.

 

The (hollow) XFR-S front sway bar weighs 3kg... even if the solid front bar weighs double that it's nothing in the grand scheme of things, the cars weigh 1700kg or more so meh to a couple of kilograms...

Since there are currently no aftermarket options and the OEM bars are still an unknown quantity, it's not like we can pick & choose here.

Hopefully our Korean friends come through with the product.

 

OK I got a look at an updated parts catalogue...

There are differences between the convertible and the coupé, also between RWD and AWD for the front bar...

Fronts
AWD, convertible & coupé = T2R7849, unique to F-Type AWD
RWD, convertible & coupé = C2P23535, same as X150 XK/R and others

Rears
Convertible with Continuous Variable Damping = C2P23536, same as 5.0L XKR-S
Convertible without Continuous Variable Damping = C2D22337, same as XF Sportbrake
Coupé with Continuous Variable Damping = C2D22337, same as XF Sportbrake
Coupé without Continuous Variable Damping = XR835524, same as X150 XK/R (not XKR-S)

 

Cambo, it is great that we have OEM choices to tune from. Are any specs available for these bars (diameter, torsional strength, etc.)?

 

I'd also be interested in the springs. Is it one size fits all (either for a particular model, or across the range), or do they use different springs based on the individual specification of the car (as BMW do for example).

 

The springs and shocks are different for the various models; RWD V6, RWD V8 Convertible, RWD V8 Coupe, AWD V6, AWD V8. Plus the difference in shocks for the Continuosly Variable Damping on top of that.

It would take a while to put them all in a table that makes some sense...

 

Everything I know about them is in this thread, and the other one in the Suspension and Handling section.

Diameters are known, but no idea about the Torsional Strength.

Although the XFR-S front bar has "600Nm" noted in the parts catalog, the rest is just fitment and p/n...

 

For those who might be interested, the J.Craft sway bars from Korea are now for sale on eBay.

J Craft Front Rear Sway Anti Roll Bars for 2009 2015 Jaguar | eBay

$550 for the pair of front & rear, including the special poly bushes, delivered to the US.

That's actually cheaper than the OEM parts!

 

Per the link above... Those are all for the XF... (Now it the XF and F-Type are interchangeable great) but the web site itself, when selecting ANY version of the F-Type responds with...

 

If you read back through this thread and the other thread in the Suspension section, the bars are interchangeable between S-Type, X350 XJ, X150 XK, XF and F-Type. There are crossover of part numbers between all the models.

 

Cambo - are you certain these sway bars fit the F -Type R?

 

Also Cambo - are you able to look us for us the specs of the F-Type Project 7 sway bars?

 

Yes, as I mentioned before the stock bars of the F-Type coupe are the same as the XK, and there are crossovers to the XF as well.

No Project 7 parts in my parts catalogue, sorry.

 

I saw on another thread that you were planning to buy a Korean front bar to complement your XKRS rear bar.

Did you do that in the end? If so can you share any feedback on the Korean bar?

 

Yes I was planning on it but have not taken it any further, at this stage i'll be putting the XJR on the market next year so i've decided to stop throwing money at it.

 

i never use dynamic/stiffer suspension settings in any of my cars, it just doesn't work on our b and c roads here in australia

i'm a fan of sways, usually my first mod along with a set of mpss, but i don't find any need for it on the f-type

on a high powered rwd car, there's a bit more involved in choosing sway thickness/rate than just simply going stiffer for the sake of it. if you want the rear to step out more suddenly, then a stiffer rear bar would work. the balance imo is pretty well spot on for street use

i find the dampening in normal mode well sorted. seems to soak up bumps really well without losing composure. this is the benefit of having a double wishbone front end. a mcpherson setup just can't match this level of compression control/comfort, regardless of how good the shocks are

re awd vs rwd front bars, you'd hope jag went with a thinner bar up front on the awd. but i imagine it's a different bar mainly due to packaging