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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Finally got everything in..now need to install



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      09-18-2011, 10:56 PM   #23
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Quote:
Originally Posted by dsbj View Post
That's a bit heavy but probably fine for NY daily city drives. Having something that can withstand nasty potholes is probably high on your priority list.

Excatly the reason I went w them..it was still a decent weight savings from the OEM wheel + RFTs going to Beyern + non RFTs

If you're serious about the track, I'd get a 2nd set-square setup in 17 or 18. You can get wheels as low as 17 pounds. That along with R compounds will make quite a bit of difference.

Will def look into that..i will have to see how dedicated to track I become..THX
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      09-18-2011, 10:57 PM   #24
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I love 'em <19 lbs, nice finish, outside lip isn't as deep as other CSL style wheels so they're easier to clean..
And surprisingly inexpensive..
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      09-19-2011, 09:19 AM   #25
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Jeez man....I'm so envious....you are going to have one bad ass riding ride....wish I could drive it....suspension is such a pain to decide and expensive if you want it to be perfect...looks like you went the right way...
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      09-19-2011, 03:43 PM   #26
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Jeez man....I'm so envious....you are going to have one bad ass riding ride....wish I could drive it....suspension is such a pain to decide and expensive if you want it to be perfect...looks like you went the right way...
THX very much..yea I spent a long time deciding on everything to try and avoid the pitfalls of making the wrong decision.

You couldnt be more right regarding the expense..unfortunatly..you really gotta pay to play..especially with suspension options
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      09-25-2011, 11:13 PM   #27
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The reason i ask is the OSG install is different from a wavetrac or quaife..and when I spoke to VAC they said they hadnt done one..I decided to do the install for the LSD at diffsonline.com; Dan has done several OSGs
Dan is the man when it comes to LSD for BMW's on the East coast.
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      09-28-2011, 11:51 AM   #28
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Congrats on the OSG and AST setup with M3 bits. *sigh*

I want the same thing for my e90. Got the Quaife from Harold back in the day when it was the only game in town (pre-Wavetrac) and OSG was soooo expensive...as I recall.

I was in a hurry to install a real diff that met my needs at the time, while reducing the wear and tear of the brakes induced by the nanny controls that passed as e-diffs for our rides.

Looking at the 400/800 Swift Spring setup with the AST singles, though... currently have 219M wheels and the potholes are not as severe in the Mid-Atlantic...

Can't wait to read your review/impressions once you put on your new toys!
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      09-28-2011, 11:55 AM   #29
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No doubt....can't wait for the review. Even though I'm sure it's going to be an un-believable ride. Which will translate to me saving for a few months and driving the wife crazy wanting to get coils again.
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      09-29-2011, 02:43 AM   #30
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No doubt....can't wait for the review. Even though I'm sure it's going to be an un-believable ride. Which will translate to me saving for a few months and driving the wife crazy wanting to get coils again.
Gizmo get a plane ticket and fly out to Tibra and drive in his car after his install it would be cheaper for you to do that than buy another set of coils and not like them.
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      09-29-2011, 08:03 AM   #31
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PLEASE keep us posted once these are installed. I'm looking at doing either the exact same setup or something similar. I like how you "hoarded" things over time...you're a patient man, I doubt I could exercise the same level of restraint. All those bits laying around, just teasing me...it would be more than I could take.
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      09-29-2011, 08:06 AM   #32
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Gizmo get a plane ticket and fly out to Tibra and drive in his car after his install it would be cheaper for you to do that than buy another set of coils and not like them.
lol...so true. I guess everyone knows my problems with suspension on here. Hopefully, I'll be happy for a while with sports/yellows
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      09-29-2011, 12:29 PM   #33
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yummy parts lol
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      10-12-2011, 09:06 PM   #34
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Absolutely guys..I will be doing a full review on everything..and bumping the thread..

Quote:
Originally Posted by gizmo335i View Post
lol...so true. I guess everyone knows my problems with suspension on here. Hopefully, I'll be happy for a while with sports/yellows
Just how many COs have you had??
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      10-12-2011, 09:09 PM   #35
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THX to you guys now i am getting the itch to swap out for APEX wheels..the more I think about it.. the weight savings are significant..and Im really feeling running a fatter sidewall w 18s vs my 19s..

Dang more money about to be spent...
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      10-13-2011, 12:24 PM   #36
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Don't lower the rear end too much with those spring rates. I am running 450/900 on my AST's with the rear tire just about even with the rear fender and it is too low as it hits the bump stops on larger bumps and can unsettle the car. Not sure why AST hasn't done shorter shock bodies in the rear and can't talk them into doing it.
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      10-13-2011, 01:01 PM   #37
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Quote:
Originally Posted by subieworx View Post
Don't lower the rear end too much with those spring rates. I am running 450/900 on my AST's with the rear tire just about even with the rear fender and it is too low as it hits the bump stops on larger bumps and can unsettle the car. Not sure why AST hasn't done shorter shock bodies in the rear and can't talk them into doing it.
Most experienced suspension tuners know the limited compression travel on these late model BMW's and be cautious when lowering these cars. It's mostly the DIY guys that slammed their cars are having issues.

Tire to fender clearance is poor indication of ride height since not everyone is on the same brand and model tire and of the same overall diameter.
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      10-13-2011, 01:16 PM   #38
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Thank you and please understand that I am far from a suspension noob and as such tend to over simplify my comments so as not to potentially confuse the less knowledgable. I was simply trying to make points in that one should not lower the car too much and that the rear shock housings need to be shorter. This is especially true given the design of most coilovers for this car as without shorter housings it is very difficult to properly tune the suspension given the factory design constraints. There is no coilovers out for this car that I am aware of that uses the bump stop in the same manner as oem which leads to a necessity of shorter shock housings or higher ride height for additional compression travel.
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      10-13-2011, 01:26 PM   #39
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Quote:
Originally Posted by subieworx View Post
Thank you and please understand that I am far from a suspension noob and as such tend to over simplify my comments so as not to potentially confuse the less knowledgable. I was simply trying to make points in that one should not lower the car too much and that the rear shock housings need to be shorter. This is especially true given the design of most coilovers for this car as without shorter housings it is very difficult to properly tune the suspension given the factory design constraints. There is no coilovers out for this car that I am aware of that uses the bump stop in the same manner as oem which leads to a necessity of shorter shock housings or higher ride height for additional compression travel.
Use it as a bump stop or as a progressive secondary spring? Bump stop is not a travel indicator and shouldn't be used as such. If used correctly there is actual benefits to bump stops to increase cornering power though added mechanical grip. Spring rate can be a factor as well, but that is a different topic.
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      10-13-2011, 01:58 PM   #40
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All interesting points but its moot..as I will only be modestly lowering the car..and maybe not even at all in the rear.
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      10-13-2011, 02:22 PM   #41
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Use it as a bump stop or as a progressive secondary spring? Bump stop is not a travel indicator and shouldn't be used as such. If used correctly there is actual benefits to bump stops to increase cornering power though added mechanical grip. Spring rate can be a factor as well, but that is a different topic.
A bump stop such as the one used on AST's (short and quickly progressing to rigid) should be avoided and is as much an indication of appropriate travel. Even with 900# springs (stiffest available in 60mm from swift) in the rear and close to stock ride height there is only about 2.25" before engagement of the bump stop begins. This is very little when considering a loaded suspension that encounters a bump mid corner.

Can you explain what you mean by "cornering power" and how that translates into a bump stop adding mechanical grip and in what situations?
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      10-13-2011, 02:30 PM   #42
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I'm envious too. A M3 suspension conversion is my next project. Report back once installed
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      10-13-2011, 04:00 PM   #43
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Quote:
Originally Posted by subieworx View Post
A bump stop such as the one used on AST's (short and quickly progressing to rigid) should be avoided and is as much an indication of appropriate travel. Even with 900# springs (stiffest available in 60mm from swift) in the rear and close to stock ride height there is only about 2.25" before engagement of the bump stop begins. This is very little when considering a loaded suspension that encounters a bump mid corner.

Can you explain what you mean by "cornering power" and how that translates into a bump stop adding mechanical grip and in what situations?
Just as you have indicated a bump stop that become very rigid quickly can cause a loss of grip in a mid turn with suspension already near or fully compressed.

Rubber, cellular polyurethane or just polyurethane, foam or what have you as long as it's progressive and provide a controlled bottoming you will have more cornering power than the sudden or short stop version, but only with the proper spring rates. I am sure you know that already.
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      10-14-2011, 11:41 AM   #44
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Oh, ok. I must have read that wrong. I think we are basically on the same page.

They still need to shorten the housings though.
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