Front Sway Bar?

[Mrmaddbrad]

Does anyone run a Large Front Sway Bar? Just curious. Maybe a GT3 sway bar? I'm assuming the fit?

Does it make it understeer?

Looking to build a C-Stock Autocross car

[Brad Roberts]

We will need more info!! what tire/size?? what spring/shock combo?

We run a LOT of Boxsters with SCCA. 99% of them are running the GT3 bar for more adjustment to conditions/driver.



B

[Mrmaddbrad]

Running typical 17" Boxster tire set up... And stock springs.... Plan on buying some adjustable Koni Shocks.

Still. If everyone else is running GT3 Sway Bars, then thats probably the way to go....

I did say i was building a C-Stock Boxster. Therefore implying stock rim size/width and stock springs.

[stephen wilson]

I believe the GT3 bar is stiffer than stock (even at the softest setting), which will increase Understeer.

[Brad Roberts]

I'm not familiar with C-stock rules Most of our cars are in prepared classes BSP/FP/XP

That being said.. stick with the stock bars and buy some BoxsterS bars (MO30) I typically carry with me 3-4 rear bars and just swap them out until I have a stock shocked car balanced the way I want it. The rear takes 10min to swap out.. the front takes a little longer.

Bars I go to the track with (and AutoX)

Tarrett
MO30
Stock

I believe you can backdate/update in C-stock?



B

[Boxster44]

Originally Posted by stephen wilson

I believe the GT3 bar is stiffer than stock (even at the softest setting), which will increase Understeer.

for what it's worth.... I have an old sheet from Ira at Tarett and it shows the front GT3 bar at softest - is 50% stiffer than stock S bar.

kj

[stephen wilson]

I was looking for that information today! I knew I had seen a list comparing the stiffness of the various roll bars that are available.

[thstone]

Originally Posted by Boxster44

for what it's worth.... I have an old sheet from Ira at Tarett and it shows the front GT3 bar at softest - is 50% stiffer than stock S bar.

kj

Any chance you could scan it and share with us?

[Mrmaddbrad]

Originally Posted by stephen wilson

I believe the GT3 bar is stiffer than stock (even at the softest setting), which will increase Understeer.

That is if you're already Understeering... But it could potentially just reduce oversteer, and body roll as they are designed to do...

[stephen wilson]

Originally Posted by Mrmaddbrad

That is if you're already Understeering... But it could potentially just reduce oversteer, and body roll as they are designed to do...

No, a stiffer front bar will increase understeer. The only unusual case where it MAY not, is on a high CG, front-heavy car, with poor camber control ( like a 60's muscle car ). In which case the reduced roll (and reduced positive camber), adds more to the front grip than the increased weight transfer (from the larger bar) removes . A Boxster certainly doesn't fit into this catagory.

There are plenty of books that explain the affects of weight transfer in detail.

[Brad Roberts]

The GT3 bar is the Tarett front bar

[Brad Roberts]

I'm a HUGE fan of adjust-ability. We dial our cars per track (its what we do in professional racing, so I do it in club racing also) **Most** of the pro drivers I work with/drive with don't run a rear bar but have a LSD (it means you are very close on spring rate and have the car balanced with slight oversteer) We change springs and tenders until the car is balanced without the bars, then use the bars as a course adjustment and the shocks as a fine adjustment.

Try it. You have nothing to lose by removing a drop link from the rear bar and placing it away from the bar. Run the car and see if you like it. If you don't like it, reconnect it~! Pretty easy. I promise less wheel spin on open diff cars if you dis-connect it.

[Kroggers]

I disconnect the front and rear for racing when it is raining, so I do know what it feels like to drive without the sway bars - just never tried it in the dry on just the rear to improve lap times...

[LAP1DOUG]

Originally Posted by Brad Roberts

I'm a HUGE fan of adjust-ability. We dial our cars per track (its what we do in professional racing, so I do it in club racing also) **Most** of the pro drivers I work with/drive with don't run a rear bar but have a LSD (it means you are very close on spring rate and have the car balanced with slight oversteer) We change springs and tenders until the car is balanced without the bars, then use the bars as a course adjustment and the shocks as a fine adjustment.

Try it. You have nothing to lose by removing a drop link from the rear bar and placing it away from the bar. Run the car and see if you like it. If you don't like it, reconnect it~! Pretty easy. I promise less wheel spin on open diff cars if you dis-connect it.

I worked all year on testing different configurations and came up with this exact same conclusion. Thanks for letting the cat out of the bag dude.

[seningen]

I have a GT3 front sway bar, GT3 adj control arms, tarret drop link clones.
I also have TIEN springs -- 500# and 692# in pairs

I was building a Boxster S track car and collecting parts -- but never built the car.

email mike@lonestarrpm.com or PM
thx

Mike