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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > Like Changing Tides - More Suspension Rambling



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      11-02-2013, 12:25 PM   #23
Phil325i
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Quote:
Originally Posted by ashmostro View Post
I'm running 450#/800# on ASTs, which is a common ratio of front to rear rates.

The ohlins are known to have a weird ratio... the rear is very soft.

http://www.e90post.com/forums/showthread.php?t=891620

http://www.e90post.com/forums/showthread.php?t=604381
Thanks for the links...but I will never race/track my car and have no need to be able to 'rotate the rear end'! I wanted maximum comfort, while retaining good handling - so the soft rear springs suit me fine. The R&T set-up is still night and day better than stock.
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      11-02-2013, 01:29 PM   #24
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From what i have heard the standard Ohlins springs are fine with the standard rear subframe bushes. I think they are said to be too soft when the rear bushes are upgraded to stiffer M3 ones.
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      11-02-2013, 04:28 PM   #25
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That's almost accurate. You see, the stock subframe bushings can't handle above a certain spring rate out back. Once upgraded you can go quite high. The ohlins kit takes that into account by not requiring a bushing upgrade to be run, but is still under sprung relative to the fronts regardless of the bushings in place.
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      11-02-2013, 04:34 PM   #26
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Quote:
Originally Posted by ashmostro View Post
Another truly excellent and well-priced option you might want to consider is TC Kline Racing. But I'm not sure what their distribution is into the UK...

As for KW, there are a lot of users on this forum stateside that run them. Take a look at the Street Comfort recommendation I made earlier and do a search. Several threads on here for them.

Personally, I run AST and am very, very pleased.
+1 I run ASTs with a spring ratio similar to you and I'm very happy with them.

I'm on Superpro rear subframe bushes though and not stock/M3 (had both)

EDIT: AST also have a very good UK HQ....

http://www.astsuspensionuk.com/
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      11-02-2013, 04:40 PM   #27
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Superpro? Delrin?
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      11-02-2013, 05:16 PM   #28
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Quote:
Originally Posted by ashmostro View Post
Superpro? Delrin?
90A polyurethane.

I had 75D AKG bushes that were way too stiff and transmitted all the noise from the m3 diff (also have TMS alu diff mounts).
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      11-02-2013, 05:18 PM   #29
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Nice. I'm running polyflex diff bushings- no more clunk between shifts!
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      11-04-2013, 05:24 AM   #30
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Well Gents,

I've decided to buy the Birds kit.

The KW setup has gone up in price to a minimum of 1400 ish, whilst I still can't get a deal from Ohlins.

I try to make decisions based on best bang for buck and that is especially true with the car. JB4 over Cobb etc. In the end it really did come down to this - is the Ohlins kit 100% better than the Birds kit? I strongly doubt it. It might be better (I'm sure it is) but I really don't think the price is justified considering the current Birds deal. I think if all was equal (the Birds kit is usually 1350) then I would certainly have purchased the Ohlins kit.

By buying Birds, I've saved 900 to put towards a BBK, or a PS4 and an XBOne... Or ya know, 20 nights out. Or whatever.

Thanks for all the advice and discussion.

Regards
Matt
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      11-04-2013, 05:58 AM   #31
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Quote:
Originally Posted by idnan View Post
+1 I run ASTs with a spring ratio similar to you and I'm very happy with them.

I'm on Superpro rear subframe bushes though and not stock/M3 (had both)

EDIT: AST also have a very good UK HQ....

http://www.astsuspensionuk.com/
I've run AST's on two of my previous cars (a Type 25 Impreza and Spec C Impreza both fitted at Powerstation) and I have as set of AST on my racing car.

The AST give really good performance on the road but I have a concern they are not going to last very long, my racing car has already got a leaky front strut (not done many events and is going back for a refurb which I am having to pay for) and on the Spec C one of my rear struts the adjuster broke off inside the tube (could not be fixed), less than 15k miles used.
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