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      03-28-2012, 08:42 AM   #7

Drives: 335xi
Join Date: Nov 2010
Location: N/A

iTrader: (2)

Originally Posted by pits200 View Post
Doyle I know you do your research but the ASTs are pretty high quality. I have a set and the drive is fantastic.

I won't comment on the TCKline since I haven't driven a car which has them. As for my ASTs, I would match them against any other coilover set I've had on previous cars when matching ride comfort with performance.

Now if you're looking for straight performance, perhaps other coils fit the bill better.

But the bottom line is, when you get into the $1500 - $2500 range for coils and find good reviews, the average driver wont notice a significant difference. With factors like tires, springs, sways and bushings, you should be happy with any of the coils you choose which have got good reviews. (Note: I know it was awhile ago, but I heard some issues with the k3s)
I never said ASTs were bad. They are absolutely better than most coilovers on the market (H&R, Bilstein, K&W). However, I feel like for 90% of the drivers on this board, and 100% of the drivers asking this question, that TC Kline will be a better choice.


1) Due to the inherint design qualities, twin tube shocks/struts will ride better with street-friendly spring rates. Monotube shocks do better with higher spring rates. For the record, on our vehicles 400/800 isn't that high of a spring rate. This is based on my personal experience, the experience of techs that I have spoken with, and the experience of just about every race team that uses $$ suspensions (Moton, JZ, AST 5xxx, Ohlins, etc). I have not had a chance to check out the new 4150s, but they may ride a little better. ASTs ride well, but I feel like my TC Klines handle fast compression a little better.

2) By your own admission, "when you get into the $1500 - $2500 range for coils and find good reviews, the average driver wont notice a significant difference". If that is the case, then why buy the $2300 AST 4100 (per HPA) over the $1900 TC Kline SA w/ external adjusters (per HPA)? All else being equal, I'll choose the less expensive route any day!
Go: Cobb S2+, Big Tom FMIC, CP-E DP & DCI, Royal Muffler, AR OC
Turn: TC Kline/Swift SA, Vorshlag Plates, UUC Front Bar, H&R M3 Rear Bar, VAC endlinks & spacers, Forgeline 18x9.5/NT05 265 Square
Stop: Endless MX72, Stoptech Rotors/Lines, Motul RBF600