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      05-05-2012, 03:06 PM   #1
DaFish
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Full M3 suspension mods - still not tracking as straight a line as I would like

After all these mods I have done ... I still have to report that the car is not tracking as straight a line as I would like it too.

With the Vishnu agressive maps, I am running 19 PSI. When I go WOT, the car will go into the left lane still - even after the toe arms. I can't seem to hammer the gas with one hand on the wheel... (not that this is a guage). I have to hang on with both hands and make slight steering corrections to keep it straight.

If I pull out to pass, it goes like a scared bunny, but it is a bit squirrelly and not as confidence inspiring. I thought the toe arms were going to fix this, and it did fix a lot of it.. but not enough.

Same with the hard braking... it doesn't track a solid line either.

I am not sure what else to do about it but live with it. It is livable....

I wanted the car to be rock M3 solid, I wonder if I have to change the rear camber arms for the M3 ones... (they have the M3 bushings in it). Or where the sloppiness is coming from.

Questions:
1) The people with the Full bolt ons and full suspension mods like I have - do you notice the same thing? (maybe there is a prob with my car)
2) What else do I have to change to get this thing buttoned down?

I think this is where the people that go to the M3 really see the difference. The M3 tracks straight in Accell and Decel - it doesn't squish around like my car does. (then again the M3 doesn't have 465 ft/lbs either)

I am contemplating what my next vehicle will be because of this. That is a tough choice because it is going to cost me big I think.
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      05-05-2012, 03:32 PM   #2
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Differential bushings. There's 3 of them. OE is to soft for your application. Talk to Shiv; he's having HP diff bushings made. Turner sells delrin bushings-very stiff, Powerflex sells urethane bushings. Check out the last page of Shiv's thread in the N54 section titled suspension. Orb mentions another control arm bushing that's too soft for your high HP application. I'm going to talk to Meyle soon to see if they have higher durometer rubber diff bushings.
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      05-05-2012, 03:57 PM   #3
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I dont have your power mods but i also have the full m3 suspension on mine and solid diff bushings and i track in a straight line. Have you tried increasing your rear tire pressure and see if it helps. another alternative is group n bushings very stiff bushings from bmw M
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      05-05-2012, 04:21 PM   #4
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tres: what do you feel with those solid diff bushings?
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      05-05-2012, 04:25 PM   #5
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the rear feels very tight and stable especially on acceleration and very little road noise.
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      05-05-2012, 04:35 PM   #6
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Quote:
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the rear feels very tight and stable especially on acceleration and very little road noise.
are you referring to and using M3 rear subframe bushings?
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      05-05-2012, 04:38 PM   #7
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no. im referering to the turner solid diff bushings. I also have the m3 subframe bushings which i might switch out



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are you referring to and using M3 rear subframe bushings?
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      05-05-2012, 04:42 PM   #8
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Quote:
Originally Posted by cvc 22349a View Post
Differential bushings. There's 3 of them. OE is to soft for your application. Talk to Shiv; he's having HP diff bushings made. Turner sells delrin bushings-very stiff, Powerflex sells urethane bushings. Check out the last page of Shiv's thread in the N54 section titled suspension. Orb mentions another control arm bushing that's too soft for your high HP application. I'm going to talk to Meyle soon to see if they have higher durometer rubber diff bushings.
I was looking under the rear 2 days ago. I have replaced a lot, but there is the M3 rear camber control arms that I could still replace.

http://hpashop.com/BMW-OEM-M3-Rear-L...ink-e9x-m3.htm

CVC, can you see if you can find a link to the bushings please? (Thanks)
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      05-05-2012, 04:44 PM   #9
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Quote:
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the rear feels very tight and stable especially on acceleration and very little road noise.
I thought NVH would go way up w/soild diff bushings. Still think those would be too much for my car though. I'm hoping to find harder durometer rubber replacements.
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      05-05-2012, 04:45 PM   #10
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Quote:
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no. im referering to the turner solid diff bushings. I also have the m3 subframe bushings which i might switch out
hm i dont know much about suspension- but want to learn. where are these bushings located and what do they replace?
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      05-05-2012, 04:49 PM   #11
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Quote:
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I was looking under the rear 2 days ago. I have replaced a lot, but there is the M3 rear camber control arms that I could still replace.

http://hpashop.com/BMW-OEM-M3-Rear-L...ink-e9x-m3.htm

CVC, can you see if you can find a link to the bushings please? (Thanks)
Which bushings? I'm old M. Cut/paste is beyond my capabilities
I don't think that lower camber link is going to solve your torque steer problem. Plus, you're going to need M3 rear shocks and race springs. Try diff bushings and lower trailing link bushings first. Read that thread I mentioned.
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      05-05-2012, 07:42 PM   #12
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road noise is unnoticeable. For 6mt guys who are running the wavetrac diff. will get the occasional thump

Quote:
Originally Posted by cvc 22349a View Post
I thought NVH would go way up w/soild diff bushings. Still think those would be too much for my car though. I'm hoping to find harder durometer rubber replacements.
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      05-05-2012, 07:53 PM   #13
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these bushings are the diff bushings,




Quote:
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hm i dont know much about suspension- but want to learn. where are these bushings located and what do they replace?
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      05-05-2012, 07:56 PM   #14
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diff bushings
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      05-05-2012, 09:35 PM   #15
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Something may be incorrectly set up. I'm running 18-19psi meth and my car tracks absolutely straight. All I have is coils, LSD and a proper alignment. Throwing more upgraded parts in an attempt to fix your issue may just get frustrating and expensive.
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      05-06-2012, 12:01 AM   #16
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I would have to agree something is not right with your car. I'm making comparable power on Cobb's S2+ aggressive map and I have a STOCK suspension - it never steers out of a lane even with traction control fully disabled! The rear does feel squishy in the first two gears at WOT and traction control will intervene when left on but that's it.

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      05-06-2012, 05:37 AM   #17
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Have you had a full geo setup since fitting all the M3 parts? That would be my first port of call if it's not tracking straight.
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      05-06-2012, 09:40 AM   #18
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Quote:
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Something may be incorrectly set up. I'm running 18-19psi meth and my car tracks absolutely straight. All I have is coils, LSD and a proper alignment. Throwing more upgraded parts in an attempt to fix your issue may just get frustrating and expensive.
OP didn't mention alignment, the first thing to look at. M camber arms would of course be good.

OP - what've you decided to do?
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      05-06-2012, 09:48 AM   #19
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Does the Dinan S3 susp. kit include upgraded shocks/springs?

Definitely have your alignment done, agreed.

I have a Quaife LSD/full M3 susp. including the subframe bushings/Rogue toe arms but my car still squats and lifts up like a boat in the front end if I punch it. Friend of mine has same setup as me save for a high-end coilover kit, and that doesn't happen. I've ordered a comparable shock/spring kit and that should solve what I'm experiencing.
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      05-06-2012, 12:33 PM   #20
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Does the Dinan S3 susp. kit include upgraded shocks/springs?

Definitely have your alignment done, agreed.

I have a Quaife LSD/full M3 susp. including the subframe bushings/Rogue toe arms but my car still squats and lifts up like a boat in the front end if I punch it. Friend of mine has same setup as me save for a high-end coilover kit, and that doesn't happen. I've ordered a comparable shock/spring kit and that should solve what I'm experiencing.
Car is going in for another alignment (4 wheel) this week. I am also getting Michelin PSS's for the front (then the alignment).

Don't get me wrong, it isn't too bad... it just isn't laser sharp and requires small corrections. Maybe the alignment will solve it.

If you pull out to pass in 3rd and hammer it, you have to hang on for sure and correct the steering. This just could be the gobs of power and tq.

I was just expecting much more from all the mods. Tighter.
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      05-06-2012, 12:36 PM   #21
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I'm in the same boat as you. Contemplating jumping ship to an M3... Upgrading to the M3 bushings in the subframe where the camber arms mount may help. The M3 bushings are quite a bit more solid and should reduce deflection under load. I also have been contemplating upgrading to the M3 differential bushings since I'm not into solid bushings.
I have a similar issue and I think it's more of a side effect to the Dinan/wavetrac LSD.
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      05-06-2012, 02:21 PM   #22
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I may give these solid diff bushings a try. Is alot of labour required to install them?

Also noticed that Turner sells solid subframe bushings, but I figure those will make the ride too harsh for street driving.
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