TT RS Rear Sway Bar...

[Marty]

includes the 24mm frt and 22 mm rear. Both are 2 hole adjustable. Going on my TT RS with H&R lowering springs P/N 29102-2 - .7 inch drop.Also have the adjustable drop links from 034 Motorsport. These will allow the install w/o any preload on the rear bar.I you preload the rear bar your car will be bouncy!

Have any pics of the rear bar? As for the front bar, this car doesn't need any more under steer.

[DesertTTRS]

that 5 mm differential. Actually playing with the adjustments - stiffer rear vs soft frt will yield less understeer than non-adjustable stock bars. One key here is not preloading the sway bars. I've set up suspension on V8 S4's,Porsches,RS4 etc and find that a properly set up set of bars is always better than a single bar.Bars are still in package .

[GaBoYnFla]

Have any pics of the rear bar? As for the front bar, this car doesn't need any more under steer.

Do them both for balance with larger or equal in rear. I have the Neuspeed setup in the TTS....it's balanced not understeer....and flat. How much heavier is the 5 cyl than the 4 cyl? You might want a bigger rear if the weight difference is significant?

[Marty]

that 5 mm differential. Actually playing with the adjustments - stiffer rear vs soft frt will yield less understeer than non-adjustable stock bars. One key here is not preloading the sway bars. I've set up suspension on V8 S4's,Porsches,RS4 etc and find that a properly set up set of bars is always better than a single bar.Bars are still in package .

Keep in mind that the torsional stiffness of a bar is proportional to the 4th power of its diameter. So a bar that is twice the diameter is actually 16 times stiffer in torsion.

Assuming the stock bars are 19mm front / 17mm rear, then the ratio of REAR bar stiffness to front bar stiffness is (17/19)^4 = 64%.

For the H&R bars of 24mm front / 22mm rear, the ratio of rear bar stiffness to front bar stiffness is (22/24)^4 = 71%.

So swapping in the H&R bars makes the rear bar to front bar stiffness ratio a little bit larger, but not dramatically so.

However, if you keep the stock 19mm front bar and just add a 22mm rear bar, then the stiffness ratio is (22/19)^4 = 180%, which is a huge increase in ratio.

These calculations neglect adjustable moment arm lengths on the adjustable bars, but you get the point.

If only the rear bar is being changed, then I have a feeling that jumping up to 22mm might be too much.

[mageus]

Desert,
Do you find a big benefit of the aftermarket end links with aftermarket bars? Some questions about the end links:

- How are they adjustable? I presume it's the end socket which appears threaded in the pics.
- What is your set point? Do you just drop it until there is no tension on the bar, or do you have to drive it around and play with different settings?

Hanging around this board is not good for my wallet. ARB was a given, but now I'm thinking about torque inserts and end links and all kinds of crazy talk!

[DrDomm]

If only the rear bar is being changed, then I have a feeling that jumping up to 22mm might be too much.

Most of us did just the Neuspeed RSB on the TTS. That was 25mm. No matter what size rear bar, this thing will still have some understeer...which is fine.

[TallaiMan]

Sorry to bump this up, but we have a little something in the works for you guys...

034Motorsport Audi TT RS & Audi RS3 Adjustable Solid Rear Sway Bar

• 362% Increased Sway Bar Rate
• 22.25mm Diameter
• Solid Spring Steel Construction
• 3-Way Adjustable
• Easy-to-Lubricate Sway Bar Bushings

Clicky!

[jibbed]

Awesome.

Have already got your end links - will go pre-order this now!

[jibbed]

Nuts... Quoting $600 for shipping to .AU via USPS

Have pinged you via your contact me form on your website. If you could get back to me that would be great!

[DrDomm]

Pretty awesome! Why not do 25mm, as the TTS Neuspeed bar? Just curious.

[Marty]

Pretty awesome! Why not do 25mm, as the TTS Neuspeed bar? Just curious.

362% not enough of a stiffness increase?

[GaBoYnFla]

Pretty awesome! Why not do 25mm, as the TTS Neuspeed bar? Just curious.

I thought someone tried one here and it hit a transfer case?

[DrDomm]

362% not enough of a stiffness increase?

Well what's the increase on the 25mm Neuspeed bar? I don't know. If it's 400%, then based on my impressions on the TTS, 362% might not be enough.

Anyway, I think there is already another 22mm bar on the market. H&R?

[DrDomm]

I thought someone tried one here and it hit a transfer case?

That was me. A slight modification in the bend, and 25mm would work fine.

[TallaiMan]

The 362% is not a typo. The 034Motorsport Audi TT RS & Audi RS3 Adjustable Solid Rear Sway Bar is solid, not tubular, like some other bars on the market.

The Neuspeed TTS bar, while 25mm in diameter, is hollow, and about half as stiff as our solid rear bar is: http://www.neuspeed.com/131/2/0/1649...-bar-25mm.html

It also does not fit the TT RS.

Our bar was designed specifically for the Audi TT RS, and to be used without any need to replace the front sway bar. It virtually eliminates body roll, and allows the car to rotate if desired.

It drastically changed the handling characteristics of our TT RS for the better, and has seen street and track testing.

[Marty]

Has anybody had any issues with their rear swaybar endlinks on their TT? I have a hard time believing that these generally need to be upgraded with the stiffer bar.

[TallaiMan]

Has anybody had any issues with their rear swaybar endlinks on their TT? I have a hard time believing that these generally need to be upgraded with the stiffer bar.

The stock sway bar end links won't break, even with an upgraded bar as stiff as ours.

We recommend our Sway Bar End Link Pair for two reasons:

• First and foremost, they are adjustable, allowing you to adjust preload on the sway bar. Even factory Audi/Volkswagen sway bars will vary in preload, and the use of an adjustable end link will allow you to compensate for that.
• They eliminate the rubber found on the stock sway bar end links in favor of sphericals. Rubber deflects, making to sway bar less effective.

[Marty]

The stock sway bar end links won't break, even with an upgraded bar as stiff as ours.

We recommend our Sway Bar End Link Pair for two reasons:

• First and foremost, they are adjustable, allowing you to adjust preload on the sway bar. Even factory Audi/Volkswagen sway bars will vary in preload, and the use of an adjustable end link will allow you to compensate for that.
• They eliminate the rubber found on the stock sway bar end links in favor of sphericals. Rubber deflects, making to sway bar less effective.

Could you talk more about the "preload" concern? The preload can't be very much, otherwise you wouldn't be able to assemble the stock endlinks on to the aftermarket bar by hand in the first place.

[TallaiMan]

Could you talk more about the "preload" concern? The preload can't be very much, otherwise you wouldn't be able to assemble the stock endlinks on to the aftermarket bar by hand in the first place.

Preload will not necessarily make it harder to install the stock endlinks onto an aftermarket bar, as most of the time the suspension is put under load to install the end links anyway.

The preload can vary from bar to bar, and usually isn't drastic. Again, even factory bars can vary in this respect.

Once you cornerweight the car, (usually resulting in the car being lowered unevenly) you will inevitably have preload that you want to remove through the use of an adjustable end link.

Hope that helps answer your question!

[Black BeauTTy]

This one has me interested. I found the upgraded RSB made a nice difference on the mkI, I suspect the same will be true on the RS.

[Marty]

I definitely felt a lot of understeer at the track that I assume could be reduced in exchange for a bit of stability with a stiffer RSB like this. Definitely interested, but I'll probably wait for a few Guinea pigs to test fit these bars first so there aren't any headaches.

[mageus]

H&R 22mm rear bar works great without any rubbing. Gonna post a writeup when I have the time.

[Black BeauTTy]

Thanks. Will be anxious to hear your thoughts.

[DrDomm]

H&R 22mm rear bar works great without any rubbing. Gonna post a writeup when I have the time.

Is that bar solid? I'm impressed this 034 bar is solid.

Back to preload and adjustable end links...my (limited) understanding is that preloading the bar will affect corner weights when setting up a "racecar". To set up the racecar suspension, you'll be adjusting ride heights. If you don't have "coilovers", you aren't going to adjust ride height on the TT RS.

So...the stock end links should be "close" to the right length to install a bar that is the same shape/size as the stock bar...to have whatever amount (hopefully negligible) of preload Audi thought was appropriate. Likewise, I'm assuming the Neuspeed endlinks would be fine also.

[Marty]

Is that bar solid? I'm impressed this 034 bar is solid.

Back to preload and adjustable end links...my (limited) understanding is that preloading the bar will affect corner weights when setting up a "racecar". To set up the racecar suspension, you'll be adjusting ride heights. If you don't have "coilovers", you aren't going to adjust ride height on the TT RS.

So...the stock end links should be "close" to the right length to install a bar that is the same shape/size as the stock bar...to have whatever amount (hopefully negligible) of preload Audi thought was appropriate. Likewise, I'm assuming the Neuspeed endlinks would be fine also.

Endlinks really shouldn't make any difference for you unless you are trying to do precise corner balancing for a track-only car, or if the stock endlinks break with the stiffer bar.

[jibbed]

Just ordered it guys (also have the sway bar end links which I haven't yet fitted).

Will post a review after it arrives.

[DrDomm]

Endlinks really shouldn't make any difference for you unless you are trying to do precise corner balancing for a track-only car, or if the stock endlinks break with the stiffer bar.

That's what I was saying.

[Marty]

That's what I was saying.

Maybe thay's where I learned it!

[mageus]

Posted a write-up on the H&R bar.

http://forums.fourtitude.com/showthr...ar-ARB-install

[jibbed]

Excited... Just found out my 034 swaybar just shipped.

Will have it fitted in the next few weeks and report back on results!

[Marty]

Posted a write-up on the H&R bar.

http://forums.fourtitude.com/showthr...ar-ARB-install

Looks like the H&R bar is 21mm, while the 034 bar is 22.25mm. Assuming they're both solid bars, then the 034 bar is (22.25/21)^4 = 126% as stiff as the H&R bar (26% stiffer). Given that the 034 is already "362% stiffer than stock", I bet either bar would perform similarly.

One thing I like about the H&R bar is that it includes urethane / teflon bushings that supposedly never need to be lubricated... the last thing I want to worry about is lubricating a squeaky sway bar bushing. And at ~$225 (H&R through ECS) vs. $325 (034 through 034), it seems like a bit of a no-brainer...

[996cab]

OEM sizes...
fronts = 22mm
rears - 18.5mm

The H&R ARBs I got fitted some 2.5 years ago are as follows...;
fronts = 24mm
rears - 22mm

@Marty,
good point ref H&R bushings...been quiet from day one...ZERO maintenance. I did ask my tuner to swap the bushings for SuperPro items and he asked me why...we left things as that as I could not give him a reason worth noting...he could have easily taken my money...!!!

[Stevelev]

Avoiding some squeaking can be meaningless to some; however, I personally hate it. I've had a few different manufacturers bars on my cars over the years and my current Neuspeed has squeaked in the cold weather. Not difficult to remedy with some lube or wrapping the bushings with teflon tape but given a lower price and mice free design, I'd say the H&R gets the

[Marty]

Avoiding some squeaking can be meaningless to some; however, I personally hate it. I've had a few different manufacturers bars on my cars over the years and my current Neuspeed has squeaked in the cold weather. Not difficult to remedy with some lube or wrapping the bushings with teflon tape but given a lower price and mice free design, I'd say the H&R gets the

Agreed. Just ordered an H&R!