Front Sway Bar

[m3kerry]

A lot of posters have gone down the e93 m3 sway bar route.

Is there a bigger / stiffer bar out there?

[CarJunkie]

Not sure how it would compare to the E93 bar, but Hotchkis makes a bar for E90-E92 that may fit. I used a hotchkis front and rear set on my STI years ago and they worked well, great quality, perfect fit.

http://www.hotchkis.net/bmw_e90_e92_...sway_bars.html

[superchargedman]

Originally Posted by CarJunkie

Not sure how it would compare to the E93 bar, but Hotchkis makes a bar for E90-E92 that may fit. I used a hotchkis front and rear set on my STI years ago and they worked well, great quality, perfect fit.

http://www.hotchkis.net/bmw_e90_e92_...sway_bars.html

Also h&r.

[Pete_vB]

The Hotchkis and H&R are both non-adjustable? What's the deal? No one makes a blade, or even three hole?

[m3kerry]

I need a big a$$ bar....

[MDORPHN]

I don't know of others not already mentioned, but you may want to check the E9x M3 boards if you haven't already done so.

You may also want to call James Clay at Bimmerword and Will Turner at TMS.

Neil

[m3kerry]

Nell that is a good thought.

[Pete_vB]

Found one from RD sport that looks nice- light, hollow, adjustable:
http://www.pyspeed.com/RD-Sport-BMW-...sport-8102.htm

[HP Autosport]

Originally Posted by m3kerry

A lot of posters have gone down the e93 m3 sway bar route.

Is there a bigger / stiffer bar out there?

What makes you want to go to a bigger front bar on the 1M?

[m3kerry]

There is still body roll snd i can't get off the corner.

Now, the car did mot have time for an alignment after the d/a koni install with the e93 m3 sway bar. I also think i heat cycled out the tires in the pro-solo. So, there are some things to change on the car.

I am 3/4 full stiff everywhere but front rebound (top adjustment on strut in the front). Need to move it up to 3/4 too on the next outing. To try to make up for the lack of spring rate. Scca stock class requires the use of the stock spring perch and springs.

[HP Autosport]

Originally Posted by m3kerry

There is still body roll snd i can't get off the corner.

Now, the car did mot have time for an alignment after the d/a koni install with the e93 m3 sway bar. I also think i heat cycled out the tires in the pro-solo. So, there are some things to change on the car.

I am 3/4 full stiff everywhere but front rebound (top adjustment on strut in the front). Need to move it up to 3/4 too on the next outing. To try to make up for the lack of spring rate. Scca stock class requires the use of the stock spring perch and springs.

That is one way try to make up for the lack of spring rates. Have you also considered a DA strut with adjustable nitrogen charge or is that even allowed in stock class?

Must it be stock springs or just springs with a stock profile? If the later, you can always get springs wound with a much higher rate from H&R or similar sources.

RD bar makes sense if you are after an adjustable bar with a slight increase in rate. The Hotchkis is probably the stiffest bar you will find with the drawback that is not adjustable(you may want to have that option with such a stiff bar).

If we can help you with Hotchkis products, please let us know.

[tracer bullet]

Would it be crazy to drill extra holes? Assuming that they are spaced far enough apart to retain strength in the bar, same diameter as the originals, good drill bit & cleaned up to avoid stress cracks after, etc.

[Papethova]

Originally Posted by HP Autowerks

The Hotchkis is probably the stiffest bar you will find with the drawback that is not adjustable(you may want to have that option with such a stiff bar).

If we can help you with Hotchkis products, please let us know.

Would the 135 Hotchkis bar fit the 1M? Is that stiffer than the OEM bar on the 1m?

[m3kerry]

Originally Posted by HP Autowerks

That is one way try to make up for the lack of spring rates. Have you also considered a DA strut with adjustable nitrogen charge or is that even allowed in stock class?

Must it be stock springs or just springs with a stock profile? If the later, you can always get springs wound with a much higher rate from H&R or similar sources.

RD bar makes sense if you are after an adjustable bar with a slight increase in rate. The Hotchkis is probably the stiffest bar you will find with the drawback that is not adjustable(you may want to have that option with such a stiff bar).

If we can help you with Hotchkis products, please let us know.

I have a d/a koni struts on the car. Bimmerhaus had to make them as a one off. The class rules do not allow much, so the bigger bar is an issue at this point.

The car runs 295/30/19 Hoosier A6's in the rear. There is a new set ready to go on the wheels and I need to check the alignment due to the suspension install was too close to Summer Nationals.

I still feel like the car is a full second off the pace. Part of this is lack of toe in in the rear. The other part is heat cycled out tires. Pro-Solo does not allow spraying between runs and is ran in a hot lapping fashion.

So there are a few things to sort through before buying, yet another sway bar, but I have a feeling I am going to have to replace the e93 m3 sway I just bought.

[HP Autosport]

Originally Posted by m3kerry

I have a d/a koni struts on the car. Bimmerhaus had to make them as a one off. The class rules do not allow much, so the bigger bar is an issue at this point.

The car runs 295/30/19 Hoosier A6's in the rear. There is a new set ready to go on the wheels and I need to check the alignment due to the suspension install was too close to Summer Nationals.

I still feel like the car is a full second off the pace. Part of this is lack of toe in in the rear. The other part is heat cycled out tires. Pro-Solo does not allow spraying between runs and is ran in a hot lapping fashion.

So there are a few things to sort through before buying, yet another sway bar, but I have a feeling I am going to have to replace the e93 m3 sway I just bought.

Any updates on your setup and results after changes are made?

[nachob]

The car has some understeer mid corner... A stiffer bar will only make it understeer more? Unless you are getting pretty crazy with alignment and tires a stiffer front bar will make the understeer worse. You would have to stiffen the rear also to keep it neutral.

[MDORPHN]

Originally Posted by nachob

The car has some understeer mid corner... A stiffer bar will only make it understeer more? Unless you are getting pretty crazy with alignment and tires a stiffer front bar will make the understeer worse. You would have to stiffen the rear also to keep it neutral.

That the conventional wisdom, but a stiffer front sway bar on most BMWs aids weight transfer and adds grip to the rear end, thereby resulting in reduced understeer

Neil