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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Coilovers or an LSD?



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      06-30-2013, 11:16 AM   #1
Maxspeed
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Coilovers or an LSD?

I have a 2009 335i coupe. My mods are: Drop-in Filter, RPI scoops, AR catless downpipes, HPF cat-back, COBB AP on stage 2 mapping.
At this point my traction isn't always there, so I'm leaning towards a Diff. How big of a difference do they make on a stage 2 car? Also which one would u recommend? (Wave trac, Quaife, OS giken?)
I don't plan on tracking the car, but do coilovers make a big difference on the streets and occasional twisties?
Thanks.
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      06-30-2013, 11:49 AM   #2
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Quote:
Originally Posted by Maxspeed
I have a 2009 335i coupe. My mods are: Drop-in Filter, RPI scoops, AR catless downpipes, HPF cat-back, COBB AP on stage 2 mapping.
At this point my traction isn't always there, so I'm leaning towards a Diff. How big of a difference do they make on a stage 2 car? Also which one would u recommend? (Wave trac, Quaife, OS giken?)
I don't plan on tracking the car, but do coilovers make a big difference on the streets and occasional twisties?
Thanks.
I would get coilovers as they improve handling more noticeable than LSD and our car will look much better lowered
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      06-30-2013, 06:00 PM   #3
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Quote:
Originally Posted by Maxspeed View Post
I have a 2009 335i coupe. My mods are: Drop-in Filter, RPI scoops, AR catless downpipes, HPF cat-back, COBB AP on stage 2 mapping.
At this point my traction isn't always there, so I'm leaning towards a Diff. How big of a difference do they make on a stage 2 car? Also which one would u recommend? (Wave trac, Quaife, OS giken?)
I don't plan on tracking the car, but do coilovers make a big difference on the streets and occasional twisties?
Thanks.

LSD: Huge improvement all around. Especially noticeable on bumpy curves, you'll still see/feel big gains on smooth. Traction plus.

Good suspension yields high G in corners, but that's not a good thing when traction isn't there.

Wavetrac here. I do not track.
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      06-30-2013, 06:24 PM   #4
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Great, two opposing answers.
Honestly though I think an LSD is better for what I want to do the car. I'm going to get a meth kit soon, and hopefully RB turbos later on.
Plus my car is on H&R springs, so I don't need the coilovers to lower the car.
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      06-30-2013, 06:48 PM   #5
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I'd vote for LSD if I had to choose which to do first. That's what I did (Quaife) and then I added coilovers a few months later. The car becomes very enjoyable when you have both though.
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      06-30-2013, 06:57 PM   #6
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coilovers and rear subframe bushings. The car will look good and feel nice with the coilovers. The rear subframe bushings will keep the car steady and planted, just gives you more confidence.

If you dont have the sport package, thats even more of a reason get the coils.
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      06-30-2013, 09:42 PM   #7
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LSD is the first and most important mod in my book. Otherwise, you will suffer from traction issues as you increase your power.

This is in my sig at the bottom:

http://www.e90post.com/forums/showthread.php?t=311570

You will wear out your rear brakes with your open diff and the nanny controls.

Coilovers won't help a car with traction issues; LSD will. Both will be fantastic!

IMO, get the diff, first.
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      06-30-2013, 10:06 PM   #8
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If you actually care about performance, lsd.
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      06-30-2013, 10:58 PM   #9
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Coilovers make quite a difference. Also lowering your car improves the looks by a lot. I'm not sure how much a difference compared to an LSD though (I imagine an LSD is a bigger diff) Anyways with coilovers you get improved looks + handeling.
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      06-30-2013, 11:19 PM   #10
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People are simply going to recommend what they have lol...but looking at it strictly from a cost standpoint, your dollar goes much further with coils. Not only will it be significantly cheaper than buying a fully built pumpkin, you will feel the difference all the time as opposed to only when you lose traction.
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      07-01-2013, 12:24 AM   #11
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There are definitely some valid points from both sides. However, my car is already lowered, and I have the HPF exhaust which scrapes because of my springs, so I couldn't afford to go any lower. (The exhaust is 3.5 inches Wide, the V-band has almost come off from scraping.) I'm also looking for good traction as I get more and more power to the rear wheels via either Methanol, E85, or larger turbos. Coilovers are something too look into later on. Thanks!
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      07-01-2013, 02:07 AM   #12
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I feel my lsd in every turn, in every condition- not just when at the limit of traction. It "pushes" me through the corner actively rather than me feeling like a nervous passenger the entire time, as I used to in this car.
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      07-01-2013, 04:02 AM   #13
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As per other replies, a LSD should be the first thing you do, no question. Why have all your mods (pulling about 380hp or so) just to give all that power away to the traction control. If you've driven a 335i with a LSD you'll know there is only one answer to your question. It transforms the mechanical grip of the car. Even more evident in the wet.
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      07-01-2013, 03:17 PM   #14
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LSD is the best mod for a 335i if you can afford it. Car already has plenty of power and a decent suspension. It could definitely use more traction and grip
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      07-01-2013, 03:49 PM   #15
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I had debated on which to do first. I went with coil overs first, but realized after running meth and some other mods that i should have went with a Quaife LSD first.

I will be installing one in the next few weeks hopefully....
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      07-01-2013, 05:12 PM   #16
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Since now you say you have "springs", and I hope you paired your springs with a set of performance struts/shocks. If thats the case then skip coilovers because it wont make a big improvement.

But if your running lowering springs on stock struts, id suggest you fix that issue before upgrading the drive train.
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      07-01-2013, 05:41 PM   #17
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Quote:
Originally Posted by SfValley335i
Since now you say you have "springs", and I hope you paired your springs with a set of performance struts/shocks. If thats the case then skip coilovers because it wont make a big improvement.

But if your running lowering springs on stock struts, id suggest you fix that issue before upgrading the drive train.
I may just go back to stock springs. The 1st owner put on lowering springs on an otherwise stock suspension, so that is an issue I will have to fix. The guys car was repossessed, he had spacers and an axel back magnaflow on a 335i...
All looks and no performance.
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      07-01-2013, 06:43 PM   #18
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Quote:
Originally Posted by Maxspeed
Quote:
Originally Posted by SfValley335i
Since now you say you have "springs", and I hope you paired your springs with a set of performance struts/shocks. If thats the case then skip coilovers because it wont make a big improvement.

But if your running lowering springs on stock struts, id suggest you fix that issue before upgrading the drive train.
I may just go back to stock springs. The 1st owner put on lowering springs on an otherwise stock suspension, so that is an issue I will have to fix. The guys car was repossessed, he had spacers and an axel back magnaflow on a 335i...
All looks and no performance.
You might as well get coils the cost of installation is gonna be the same so you don't wanna pay for installation twice when you can save that extra money for the lsd
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      07-01-2013, 07:19 PM   #19
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Based on your other mods I suggest LSD.

If you don't track and you are already lowered, I would skip the coilovers.
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      07-01-2013, 07:33 PM   #20
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Quote:
Originally Posted by ilikebmxbikes View Post
Based on your other mods I suggest LSD.

If you don't track and you are already lowered, I would skip the coilovers.
+1
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      07-03-2013, 09:16 PM   #21
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Quote:
Originally Posted by nitehawk
People are simply going to recommend what they have lol...but looking at it strictly from a cost standpoint, your dollar goes much further with coils. Not only will it be significantly cheaper than buying a fully built pumpkin, you will feel the difference all the time as opposed to only when you lose traction.
+1


I did coils then a diff and couldn't have been happier. Coils make it much easier/safer to drive the car harder, where the diff would then come into play. Get coils first, then go for the diff.
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      07-15-2013, 12:39 PM   #22
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We would recommend a Quiafe LSD over a suspension upgrade for your certain situation. If you already have lowering springs and feel that is sufficient enough (but can always be improved later), a Quiafe LSD will greatly improve the handling and response of your e90. In addition, an LSD will make your car more predictable which, in turn, improves safety. If you have any questions, please feel free to contact us as we are one of the major distributor of Quiafe Limited Slip Differentials.

Mike
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