Are the sway bars different on the Touring? What is recommended for Tourings? Suggestions are appreciated.

>^..^<

Are the sway bars different on the Touring? What is recommended for Tourings? Suggestions are appreciated.

>^..^<
the popular upgrades are from the nurumbugring m5 edition touring.
25mm front
http://www.realoem.com/bmw/showparts.do?model=HJ91&mospid=47399&btnr=31_0050&hg=31&fg=10
20mmrear
http://www.realoem.com/bmw/showparts.do?model=HJ91&mospid=47399&btnr=31_0050&hg=31&fg=10

also check this link:
http://www.bmwe34.net/e34main/upgrade/swaybars.htm

as far as the dif, I know guys who put the m5 touring bars on sedans so probablly no dif.


darron

the popular upgrades are from the nurumbugring m5 edition touring.
25mm front
http://www.realoem.com/bmw/showparts.do?model=HJ91&mospid=47399&btnr=31_0050&hg=31&fg=10
as far as the dif, I know guys who put the m5 touring bars on sedans so probablly no dif.
darron

Tourings already have a 25mm front bar. If you want bigger (or adjustable), you'll have to go either aftermarket. I'm quite fond of my 25mm Dinan adjustable front with the 20mm M5T rear bar.

Thanks ...from my initial opinion ...the rear is where it need improvement most. Can you give more info on the M5T rear bar?

thanks again,

>^..^<

IS the M5T bar any bigger than the OEM one? I know front is the same part except for a clearance related kink.

CATMAN are you running staggered tire pressures? 7-8 psi higher in the rear?
circa 35 F 42 rear?
That is a BIG difference in and of itself in dialing out understeer if you are not yet doing so.

CATMAN are you running staggered tire pressures? 7-8 psi higher in the rear?
circa 35 F 42 rear?
That is a BIG difference in and of itself in dialing out understeer if you are not yet doing so.

i'd say the opposite, higher pressure in the front will dial out understeer, unless you're already running too high a pressure.

I just got an M5T rear bar for my 91 m5, if you go to any parts counter, they can get it for you. Cost is about $120, and as of a couple weeks ago, there were over a dozen in the US parts system. (it's a popular mod). If you need the pn, you can get it thru realeom.com, or via a search of the e34 page on m5board.com

i'd say the opposite, higher pressure in the front will dial out understeer, unless you're already running too high a pressure.

I just got an M5T rear bar for my 91 m5, if you go to any parts counter, they can get it for you. Cost is about $120, and as of a couple weeks ago, there were over a dozen in the US parts system. (it's a popular mod). If you need the pn, you can get it thru realeom.com, or via a search of the e34 page on m5board.com

the wagon is spec'd to have much higher pressures in the rear, but i'm sure most don't run them that way. i don't run as high as they recommend, mostly because it's not loaded up that often. for a long trip i will up it.

i'd say the opposite, higher pressure in the front will dial out understeer, unless you're already running too high a pressure.

I just got an M5T rear bar for my 91 m5, if you go to any parts counter, they can get it for you. Cost is about $120, and as of a couple weeks ago, there were over a dozen in the US parts system. (it's a popular mod). If you need the pn, you can get it thru realeom.com, or via a search of the e34 page on m5board.com

Tourings have a rear weight bias, higher CG, and more weight aft of the rear tires, they are spec'd to run higher rear pressures rear because it will neutralize to a minor extent some of these issues, and make the car more rotate-able with the throttle in a corner.

In my experience less than 5 psi difference in the Touring is "plow-ey" and great for poor weather or normal commuting, but in the dry 7-8 psi is the most neutral you can get on stock sways, and gives rotation under throttle instead of plow.
I've run higher pressures rear on my MGB, TSi AWD, and The TOURING after real world experimentation on each starting with 5 psi bias front and winding up with a rear bias in every case. IF you went low enough in the rear, i suppose you could again reduce sidewall preload to the point where it would heel over badly enough to lose traction... Too risky for me.

BMW themselves recommend higher pressures rear in the Touring... (though the absolute pressures vary for unloaded/normal, and loaded driving)

the wagon is spec'd to have much higher pressures in the rear, but i'm sure most don't run them that way. i don't run as high as they recommend, mostly because it's not loaded up that often. for a long trip i will up it.

right, but that is generally due to loads and weight. BMW NA also specs virtually every one of their cars to have a significant stagger in tire pressure, with rears higher than fronts, in their attempt to induce understeer.

When i had my wagon, which i tracked numerous times, it did tend to be a bit tail happy (mine had the dinan stage 3 suspension), and on that car i actually did have a bit of pressure stagger and tightened the front bar to compensate.

In any of the 'driving books' (watts, barber etc) you'll find tables of what to do to alter handling balance, tire pressure stagger is generally listed as more psi in the rear will add understeer, unless you're starting with oddball pressures to begin with. Different cars will react differently, the e34 is a bit odd in that you tend to get lift throttle understeer, due to it's rear suspension design.

yeah I know, and I've always wondered why I always find reducing rear pressure to make the car wallowy and wind up with less usable rotation...

mgb: rwd underpowered open straight axle, no rear bar, limiting straps 50/50 balance

Tsi AWD: AWD LSD rear, 50/50 power distribution at traction limit, ~55 45 weight distribution, NOT underpowered, dual a-arm IRS.

Touring: RWD LSD rear, 47-53 weight, underpowered, trailing arm IRS.

all had wider than stock wheels/tires.

I wonder if my driving style, late in, HARD tight out, let the car 4 wheel drift slightly is why I like it better...

:shrug: maybe the understeer is masked by the rears being on the edge of adhesion and throttle steering as opposed to ultimate grip seeking???