Which front sway bar to pair with BMR rear sway bar on wagon? - Chevy Impala SS Forum
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post #1 of 17 (permalink) Old 03-14-2019, 09:04 PM Thread Starter
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Which front sway bar to pair with BMR rear sway bar on wagon?

I just got my BMR rear sway bar installed on my wagon, which still has the stock front sway bar. I think the BMR bar is 1.5" in diameter. It's got stock (I think) springs, Bilsteins, and relatively sticky 255/45R20 high-performance all-seasons.

I took a couple of corners and the car has gone from understeer to either oversteer or A LOT of oversteer. Obviously I need a larger front sway bar to balance out things. I'd prefer neutral to slight oversteer bias.

Options:
BMR - 32mm / 1.26" solid - $209.95 - https://www.bmrsuspension.com/?page=...=39&superpro=0

Spohn - 33.3mm / 1.31" solid - $212.50 - https://www.spohn.net/shop/1978-1996...rome-Moly.html

Hotchkiss - 36.5mm / 1.44" hollow - $305.99 - https://www.hotchkis.net/product/197...=&sm=#overview

I'm inclined to go with the BMR as it's the smallest (assuming that all other things being equal, a smaller front sway bar ought to preserve a little of the tail-happiness of the BMR rear sway bar), and because I'm hoping that getting sway bars from the same company will mean that they are designed to work well together.

What do you guys think?

--'94 Caprice "SS" wagon, 0.30 over, high-volume oil pump, LT4 hot cam, 1.6:1 rockers, ported aluminum Corvette heads, shorty headers, PCM4Less tune, 4.10s, shift kit, side-exit dual exhaust with Flowmasters, OR X-pipe, F-body gauge cluster, Bonneville front and rear seats (working electrics), Bravada console shifter, Bilsteins, 12.7:1 Impala steering box, Boss 338s with 255/45R20s, bunch of other stuff I'm forgetting.
--'04 Mustang Cobra, '15 Audi S4
--1125R, 1050, VMax, VFR800, DRZ-400E
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post #2 of 17 (permalink) Old 03-14-2019, 09:10 PM
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Quote:
Originally Posted by TheFleshRocket View Post
I just got my BMR rear sway bar installed on my wagon, which still has the stock front sway bar. I think the BMR bar is 1.5" in diameter. It's got stock (I think) springs, Bilsteins, and relatively sticky 255/45R20 high-performance all-seasons.

I took a couple of corners and the car has gone from understeer to either oversteer or A LOT of oversteer. Obviously I need a larger front sway bar to balance out things. I'd prefer neutral to slight oversteer bias.

Options:
BMR - 32mm / 1.26" solid - $209.95 - https://www.bmrsuspension.com/?page=...=39&superpro=0

Spohn - 33.3mm / 1.31" solid - $212.50 - https://www.spohn.net/shop/1978-1996...rome-Moly.html

Hotchkiss - 36.5mm / 1.44" hollow - $305.99 - https://www.hotchkis.net/product/197...=&sm=#overview

I'm inclined to go with the BMR as it's the smallest (assuming that all other things being equal, a smaller front sway bar ought to preserve a little of the tail-happiness of the BMR rear sway bar), and because I'm hoping that getting sway bars from the same company will mean that they are designed to work well together.

What do you guys think?
How big is the front swaybar on your car now?
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post #3 of 17 (permalink) Old 03-14-2019, 09:24 PM Thread Starter
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Which front sway bar to pair with BMR rear sway bar on wagon?

Itís the stock wagon front sway bar, so something tiny!

Google says itís 28mm.

--'94 Caprice "SS" wagon, 0.30 over, high-volume oil pump, LT4 hot cam, 1.6:1 rockers, ported aluminum Corvette heads, shorty headers, PCM4Less tune, 4.10s, shift kit, side-exit dual exhaust with Flowmasters, OR X-pipe, F-body gauge cluster, Bonneville front and rear seats (working electrics), Bravada console shifter, Bilsteins, 12.7:1 Impala steering box, Boss 338s with 255/45R20s, bunch of other stuff I'm forgetting.
--'04 Mustang Cobra, '15 Audi S4
--1125R, 1050, VMax, VFR800, DRZ-400E
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post #4 of 17 (permalink) Old 03-15-2019, 12:35 AM
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Why did you install that largish rear bar?

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post #5 of 17 (permalink) Old 03-15-2019, 11:46 AM
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Most chose same brand sway bars that were designed to work "together"

FWIW I went with Hotchkis 20 years ago.

\'96 BBB 383/T-56
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post #6 of 17 (permalink) Old 03-15-2019, 03:09 PM
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Probably selected the single worst rear bar for your application. Installing the factory bar in it's place will likely make a huge improvement if not elimination of any oversteer issue(s)....

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post #7 of 17 (permalink) Old 03-15-2019, 07:06 PM
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Bigger not always better. I am running the rear 9C1 bar and actually took out the front 9C1 bar and ran a civi Caprice front bar. GM loved that 1/8" bigger front bar to induce understeer. Same size or slightly larger rear will get you close to neutral.
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post #8 of 17 (permalink) Old 03-15-2019, 10:28 PM
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Probably selected the single worst rear bar for your application. Installing the factory bar in it's place will likely make a huge improvement if not elimination of any oversteer issue(s)....
Not to be picky, but there is no rear factory bar for our wagons.

I use a 70'S B body rear bar for sedans which fits perfectly. Part of the Pontiac RTS option.............radial tuned suspension............ which was a big deal back then. Only available for sedans, coupes, conv, not wagons.

I think there is a 91 - 96 limo or commercial option with rear bar, but don't think it fits wagons. The FW crowd will chime in.

grandpas wagon
1994 RMW 80K, clear corners, Gary's cables - battery, headlight, mech fan delete, air pump delete, home plate/first base delete, Bill Harper wiper arm mod, Corvette starter, 1LE elbow, Team SS pipe, K&N filter swiss cheese airbox, throttle body bypass, LED headlights.

All my posts contain 100% recycled electrons.

Last edited by grandpas wagon; 03-16-2019 at 12:46 AM.
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post #9 of 17 (permalink) Old 03-16-2019, 09:06 AM
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Try contacting BMR, tell them which rear bar you got, and ask for a recommendation for a front bar. Also see what else they recommend to get you where you want to be. I think if you start guessing on your own you won't be happy.
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post #10 of 17 (permalink) Old 03-16-2019, 03:03 PM
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While I am guilty liking a lot of bar , that is a LOT of bar! !

When doing your front to rear bar ' figgerin" remember to must take into consideration tubular vs solid
http://www.auto-ware.com/calcs/swaybar.htm

While millions of cars use the strap to lower arms type rear bar, it is less than optimal from a design standpoint.

One thing I noticed in my case , with poly type rear arms , the susp would seem to go into bind as it rolled which will spike outside loading.

I since changed to a bearing type arm and that tamed the , at the limit, oversteer sensation.

I "only " have a 1.25 solid rear bar and 1.25 solid front but the front is the short arm "F" bar repositioned back so it "acts" like a large "B" bar.

On the street, I am happy, but will note even with the front disconnected on the way to the drags, it is not evil oversteer.

The wagon is tail heavy and add the pendulum effect of the tail gate WAY back there, part for part is going to be more tail happy than the sedan.

While I live in a road racing environment, I have not road coarsed my wagon and must defer to people here with experience for actual "B" body track use

On the street, if you are keeping that rear bar, I think you are going to need some more front bar.
My gut would look at the Spohn if it is a true "B" body arm length

Take the above for what it is, an opinion

Gerry
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Last edited by 95wagon; 03-16-2019 at 03:52 PM.
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