|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
change bushings to reduce understeer?
|
|
02-02-2012, 12:19 AM | #1 |
Brigadier General
596
Rep 3,386
Posts |
change bushings to reduce understeer?
i dont know much about suspension components. i am trying to reduce understeer in my 335xi. i have Bilstein Sport shocks and H&R sport springs. i was also thinking about getting a rear sway bar. from what i heard getting just the rear sway bar will help more then getting both the front and rear because tightening up the front will still make me have understeer. if this is wrong please correct me. i was also curious if i should change my bushings? would this help reduce understeer? if so should i just do the rear like the sway bar or do i change the front and rear to help reduce understeer? thanks
|
02-08-2012, 09:21 PM | #2 |
Major
48
Rep 1,010
Posts |
I just spoke to Sal at ACM about this.. Yes.. It is highly recommended.. Let me know how it goes if you do bc I'm interested in the same.. Good choice of mods bro
__________________
2008 335xi Jet Black//Coral Red VTT Stage 1+// Procede V5//VRSF DPs//AMS FMIC//KW V1//M3 Sways & Sub Bushings// Alpina AT flash Apex EC-7//Michelin PSS//Dinan CAI |
Appreciate
0
|
02-09-2012, 07:10 PM | #3 |
Lieutenant General
178
Rep 11,768
Posts |
stiffer bushings? yes it will help with handling.
__________________
-Rev
SGM e92 335xi|Helix|AFE|AWE|PROCEDE|SYNAPSE|ER|OSS|BMW PERFORMANCE|P3|always growing.. |
Appreciate
0
|
02-28-2012, 07:31 PM | #6 |
Major
38
Rep 1,079
Posts |
I just did this on my car. Its rather noticeable, but I can't really push my winter tires hard enough to really find out. I also recommend camber plates if you're attempting to reduce understeer.
__________________
2004 E46 M3 | Imola Red on Cinnamon | Slicktop | Manual Seats | 6spd MT |
|
Appreciate
0
|
02-29-2012, 11:21 AM | #7 |
Chief Executive
300
Rep 2,886
Posts
Drives: 2008 335xi 6spd Coupe
Join Date: Dec 2007
Location: Boston
|
One of the easiest, cheapest and first things you should do to neutralize an AWD car's handling by reducing understeer is managing tire pressures closely, and selecting tire widths appropriately.
Don't rush to 265s or 275s for the rear wheel's tire widths. Everyone's all about width on the rears, and it's only hurting the understeer problem. Secondly, you should be running more tire pressure on the rears than the fronts. I run 36psi rear, and 32 front. While the car isn't neutral, it's really not too far off. With DTC on, I can send the ass out on a ramp without too much trouble at all. Rear sway bar certainly will help, and bushings maybe a little. |
Appreciate
0
|
03-01-2012, 10:58 AM | #8 | |
Brigadier General
596
Rep 3,386
Posts |
Quote:
|
|
Appreciate
0
|
03-01-2012, 11:20 AM | #9 |
Brigadier General
596
Rep 3,386
Posts |
this is from tirerack.com
adjustments Decrease Understeer Decrease Oversteer Front Tire Pressure Higher Lower Rear Tire Pressure Lower Higher Front Tire Section Larger Smaller Rear Tire Section Smaller Larger Front Wheel Camber More Negative More Positive Rear Wheel Camber More Positive More Negative Front Wheel Toe Toward Toe-Out Toward Toe-In Rear Wheel Toe Toward Toe-In Toward Toe-Out Front Wheel Caster More Positive More Negative Front Springs Soften Stiffen Rear Springs Stiffen Soften Front Anti-sway Bar Soften (Thinner) Stiffen (Thicken) Rear Anti-sway Bar Stiffen (Thicker) Soften (Thinner) Weight Distribution More Rearward More Forward |
Appreciate
0
|
03-01-2012, 08:58 PM | #10 |
New Member
2
Rep 13
Posts
Drives: 2009 335xi LeMans Blue
Join Date: Jul 2010
Location: Chelmsford, MA
|
As mentioned above:
For Turn-in: Add a bit of Camber, Slightly stiffer rear sway, and the appropriate choice of Springs & Struts/Shocks or go to decent coil-overs: For Continuing the rotation after turn-in, put a LSD (same as for a 335i) in. This will keep you from losing power in the rear, therefore note getting a higher ration of power up front. That is a big source of the understeer with these cars. I have a Wavetrac, and the rear-end really hooks up well now on the track.
__________________
2009 335i xDrive 6MT LeMans Blue
Dinan Intercooler, Dinan Oil Cooler, Dinan Cold Air Intake, Dinan Stage3 SW, Dinan Stage 3 Suspension, Dinan Front Strut Brace, Dinan Exhaust, WaveTrac LSD (rear), D-Force EmPowers, PFC BBKs, UUC SSK, Macht Schnell TMPS Override |
Appreciate
0
|
03-08-2012, 08:08 AM | #11 |
Chief Executive
300
Rep 2,886
Posts
Drives: 2008 335xi 6spd Coupe
Join Date: Dec 2007
Location: Boston
|
|
Appreciate
0
|
03-14-2012, 12:13 AM | #12 | |
Lieutenant
54
Rep 484
Posts |
Quote:
__________________
2007 328xi E92 6MT Jet Black/Coral Red | Tracks: NJMP
Last edited by ccraig13; 03-14-2012 at 12:21 AM.. Reason: Explained the reason for my madness |
|
Appreciate
0
|
03-18-2012, 02:35 PM | #13 |
Brigadier General
596
Rep 3,386
Posts |
|
Appreciate
0
|
05-06-2012, 04:09 PM | #14 | |
Captain
84
Rep 703
Posts |
Quote:
|
|
Appreciate
0
|
05-07-2012, 08:30 AM | #15 |
Lifelong Cynic
11
Rep 167
Posts |
No, that would have the opposite effect. When you raise the tire pressure you decrease traction (the size of your contact patch). To make your car less prone to understeer you would want to run higher pressure in the rear than in the front.
__________________
RIP 08 E92 335xi 500whp
|
Appreciate
0
|
05-07-2012, 11:57 AM | #16 | |
Chief Executive
300
Rep 2,886
Posts
Drives: 2008 335xi 6spd Coupe
Join Date: Dec 2007
Location: Boston
|
Quote:
You want higher PSI in the rears, and less up front. 32F/36R works pretty nicely for me. With DTC on, the car feels really good. Predictable and neutral. |
|
Appreciate
0
|
05-07-2012, 12:23 PM | #17 |
Brigadier General
596
Rep 3,386
Posts |
i dont think thats really true since your fronts dont have ideal contact patch. 36 maybe fine in the rear but 32 up front is to low
|
Appreciate
0
|
Bookmarks |
|
|