Anti-Roll (sway bar) suggestions

[m3kerry]

Has anyone upgraded the front Anti-roll bar? I am sure some have. What are the options out there?

[EINSER M]

Originally Posted by m3kerry

Has anyone upgraded the front Anti-roll bar? I am sure some have. What are the options out there?

FYI was w/ Eibach USA for R&D and they will come out wit theirs in about 4-6 weeks along with new lowering springs and coil overs are coming soon too

[MDORPHN]

I'm running the E93 M3 front sway bar.

Neil

[m3kerry]

Originally Posted by MDORPHN

I'm running the E93 M3 front sway bar.

Neil

How is that working for you?

I over barred my e36 m3 in B stock back in the mid 2000s. It ate front tires and lifted front tires while turning. I don't want to repeat that mistake.

[MDORPHN]

Originally Posted by m3kerry

How is that working for you?

I over barred my e36 m3 in B stock back in the mid 2000s. It ate front tires and lifted front tires while turning. I don't want to repeat that mistake.

It's only slightly stiffer than the stock E92 M3 bar that is fit on the 1M.

I ran with it for the first time last weekend at VIR. However, I was also running there on street tires (Mich PSS) rather than DOT-R rubber (Toyo R888), so I couldn't isolate how the bar affected my lap times.

Nonetheless, I was less than a second off my lap times with the DOT-R rubber, which is less than I expected. I figure that the narrow difference is due, at least in part, to the larger front sway.

Hope that makes sense.

Neil

[m3kerry]

Originally Posted by MDORPHN

It's only slightly stiffer than the stock E92 M3 bar that is fit on the 1M.

I ran with it for the first time last weekend at VIR. However, I was also running there on street tires (Mich PSS) rather than DOT-R rubber (Toyo R888), so I couldn't isolate how the bar affected my lap times.

Nonetheless, I was less than a second off my lap times with the DOT-R rubber, which is less than I expected. I figure that the narrow difference is due, at least in part, to the larger front sway.

Hope that makes sense.

Neil

It does, I wonder about going a little larger with the H & r bar 28mm.

[superchargedman]

Yeah, I was looking into it, and all I could find is the hr

[m3kerry]

The e93 sway bar is 28mm too, if i am reading this right and only $200 bucks from turner.

[superchargedman]

Yeah, I meant beyond e93.

[m3kerry]

Does anyone have an idea as to the difference of a 28mm h& r bar vs a e93 28mm bar?

[Plautos]

Originally Posted by m3kerry

Does anyone have an idea as to the difference of a 28mm h& r bar vs a e93 28mm bar?

the hr is 27mm straight... the bmw e93 oem isn´t... at the arrest points the bar has 28mm, but in the middle it has 24mm.. search for pictures... then you will understand.

[MDORPHN]

Originally Posted by Plautos

the hr is 27mm straight... the bmw e93 oem isn´t... at the arrest points the bar has 28mm, but in the middle it has 24mm.. search for pictures... then you will understand.

Quite right (though I didn't measure narrower diameter portion in middle). However, unlike the stock bar, it is hollow -- which contributes a lot to stiffness.

Have no idea how it compares to the H&R piece.

Neil

[m3kerry]

Tuner has the e93 bar for $200, so i am probably going that route.

[MDORPHN]

Originally Posted by m3kerry

Tuner has the e93 bar for $200, so i am probably going that route.

You also need new brackets and bushings. Tischer (bmwpartsonline) sells a kit with bits and pieces for around $230.

EDIT: Meant to say Tischer (getbmwparts). Sorry!

Neil

[superchargedman]

Thanks, Neil! That may have sealed it for me!

[Plautos]

Originally Posted by m3kerry

Tuner has the e93 bar for $200, so i am probably going that route.

go for HR for best results...

if my math is right, the e93 bar is only 5% stiffer them 1M´s.

by the way, the rear e93 oem bar is very helpful..

the stiffness calculation is very simple… diameter^4

26mm^4 you have 456976mm4
27mm^4 you have 531441mm4

Divide one by the other you will find 14%

[MDORPHN]

Originally Posted by Plautos

go for HR for best results...

if my math is right, the e93 bar is only 5% stiffer them 1M´s.

by the way, the rear e93 oem bar is very helpful..

the stiffness calculation is very simple… diameter^4

26mm^4 you have 456976mm4
27mm^4 you have 531441mm4

Divide one by the other you will find 14%

Nope, cause the E93 bar is hollow...

Neil

[m3kerry]

Originally Posted by MDORPHN

You also need new brackets and bushings. Tischer (bmwpartsonline) sells a kit with bits and pieces for around $230.

Neil

I will take a look at their site in a little while.

[Fundahl]

Increasing front roll stiffness would increase the tendency for steady-state turn under-steer, no?

I can see that being beneficial at high speeds when I've seen the 1M break loose just from turning in too sharp.

[m3kerry]

Originally Posted by Fundahl

Increasing front roll stiffness would increase the tendency for steady-state turn under-steer, no?

I can see that being beneficial at high speeds when I've seen the 1M break loose just from turning in too sharp.

It helps with corner exit to get power down. Power and going fast quick is the 1m's strength compared to the other cars in the class, so a tenth at every corner can be the difference in winning or being a full second off of the pace.