BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > M3 Marketplace > Private Sellers - For Sale / Trade / Wanted > Suspension / Brakes / Chassis / Spacers
 
BPM Sport
Post Reply
 
Thread Tools Search this Thread
      06-29-2012, 05:40 PM   #1
HP Autosport
BimmerPost Supporting Vendor

 
Drives: F80 M3
Join Date: Mar 2007
Location: Santa Barbara, Brembo, GIAC, Koni, Ohlins, Performance Friction, Quaife, Stoptech, Vorshlag

Posts: 11,288
iTrader: (29)

BIMMERPOST / Classifieds
Asking Price:
None
Item Interest
The 4200 Series shocks use AST’s Twin Piston Dual Adjust (TPDA) technology. Similar non adjustable versions have been found in the highest forms of racing. TPDA builds on this technology to allow for 2 adjustment knobs to be mounted on the shock body (no tools required). Quick rebound and compression changes can be made in the pits in seconds. 4200s are fully customizable and rebuildable.

Proven on the street and track, this system is unmatched by any other system on the market. HP Autowerk's unique AST dampers matched with our custom Swift springs offers superb street manners and unmatched cornering capabilities for the track. Offering separate external compression(Double Adjustable Only) and rebound adjusters, the dampers can be tuned from street comfort to a full race setup in a matter of minutes.

Not looking for that slammed look? Or just want to retain stock ride hight, but want better handling? We can customize the spring rate and height for you! All other off the shelf coilovers can't do that for you!

We use the highest quality motorsport springs sourced from Swift. Why Swift?

Swift's R & D team created material, called H5S.TW, which is stronger then regular silicon chrome material. Because of this material, we could make the spring wire thinner, and could wind the springs with fewer coils, which greatly decreased weight while dramatically increasing available stroke.

We also use thrust sheets where possible. Here is why:

Thrust sheets provide a variety of benefits to coilover systems. As a spring becomes compressed the coils attempt to distribute the energy by unwinding. This is called twisted force. The unwinding makes the spring rate irregular. By allowing the spring to smoothly rotate around the perch during compression, the spring rate will return to normal. Thrust sheets also help dampening and rebound of struts too. Thrust sheet?s bearing action allowing the rotation of a spring allow the load on the spring to be more evenly Distributed which reduces lateral shock shaft load. Increased lateral load on shock shafts cause a reduction in the struts ability to rely on valves for dampening force.

Monotube design - gives the biggest piston sizes available

Floating piston design with high pressure nitrogen means no cavitation around the piston

Compression and Rebound adjuster knobs permanently mounted on the dampers – no fumbling for knobs

Fully threaded strut bodies allow maximum tire width without fender rolling or larger spacers

Rebuildable by AST-USA – get the valving you want, when you want it.

*Coilover shown with optional helper/tender springs and BMW radial bearings. Please call for specific applications

*Camber plates are required for the 1M and M3

*We stock all popular rates of high quality Swift springs

*Optional AST 5000 series dampers with remote reservoirs are also available

Applications for E36 and E46(including M3), E82, E90, E92, and E93.


Above is what the 4200 is all about. However, these were recently(May, 2012) fully rebuilt/revalved and new 4250 Double Digressive Pistons installed:

DDP Technology Piston
Our latest digressive piston developed for GRAND-AM gives drivers and race engineers the best of both worlds. Drivers love the low speed damping response and body control, while race engineers love the “blow off” at high shaft velocities. When the rebound adjustment is soft, the damper curve looks similar to an OEM street shock profile. When the rebound adjustment is hard, the damper curve looks like a race shock!
This “Jekyll and Hyde” personality is exactly what AST 4000 Series customers want: soft street ride and race car track performance in ONE shock - all with the turn of a knob!
Lower Drag Seals
High performance seals are a challenge for any damper. They must balance friction and sealing ability while not impacting shock performance and not leaking; a difficult balancing act! While the seal was originally developed for GRAND-AM road racing, AST is taking our knowledge from the track to the street again. Newly redesigned seals decrease hysteresis in the damper and decrease seal drag over 50%.

This particular kit was installed on my personal 1M and since I will be testing the new Vorshlag camber plates and Swift sport springs in the very near future so this kit will be removed from the vehicle.

Current spring rates are 400F and 672R(I can substitute other spring rates of your choice as well).

Retail on the AST 4200 is $3717 and the upgrade to 4250 is $1000+

You will also get the rear quick change spring kit(normally an additional $165) as part of the sale. Rear AST remote adjusters(a $70 value) will also be FREE.

Selling this kit with less than 5000 miles total and about 750 miles since the rebuilt/revalved for SOLD! shipped to the US 48 States.

***photo is the kit before installation***

Harold

Attached Images
 

Last edited by HP Autosport; 07-04-2012 at 12:09 AM.
HP Autosport is offline   United_States
0
Reply With Quote
      07-03-2012, 03:59 PM   #2
RickyBobby
Lieutenant
 
RickyBobby's Avatar
 
Drives: M3
Join Date: Mar 2008
Location: NorCal

Posts: 492
iTrader: (1)

Bump for Harold. I'm still loving my ast's after 2 years.
Harold I sent you a pm to get your thoughts on the digressive pistons. I'll be sending mine in for a refresh at the end of this season and would like to get your impression of this is worth the cost. My setup is so dialed in I'm hesitant to change it.
RickyBobby is offline  
0
Reply With Quote
      07-04-2012, 12:08 AM   #3
HP Autosport
BimmerPost Supporting Vendor

 
Drives: F80 M3
Join Date: Mar 2007
Location: Santa Barbara, Brembo, GIAC, Koni, Ohlins, Performance Friction, Quaife, Stoptech, Vorshlag

Posts: 11,288
iTrader: (29)

Thanks for the bump!

These are officially SOLD as of this afternoon!
HP Autosport is offline   United_States
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 08:38 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST