Koni FSD Kit 2100-4041

Sorry I made a mistake on the bump stop pictures.
You should understand that the long one is the rear and shot one is the front bump stops

Thanks
 
ariles said:
What if I order the longest ones as I'm not against hiring up the car. The 140mm for rear and the 85mm for front ?
What are the consequences on comfort and road handling ?
Are they still compatible whith Koni FSD set?
Click to expand...

Hello,

I assume you want to keep the standard length stock Audi springs for maximum comfort w/ Koni FSD?

Highly recommended are the SPIDAN front springs (#49515 for the TDIs) to avoid future breaking of the front springs.


For all A2s except for the 1.2 the
  • front bump stop # 8Z0 412 301
  • rear bump stop # 6Q0 512 131 B
will be correct and can be ordered through any VAG dealer.



The length of these yellow rubber bump stops has not to be changed if you maintain standard car height!

Only if using sport lowering springs you have to shorten these rubbers by the amount of lowering (for example 30 mm lowering springs demand 30 mm cutting).

Applying longer bump stops than stock is counter-productive because then the free spring travel is reduced resulting in
  • less comfort
  • less road-holding
  • less traction
  • less grip
  • longer breaking distance
  • and NO height increase at all because the springs do determine the car's height primarily.

Please remind.
These bump stops should only be active in case of very deep potholes to protect the damper's internals (valves) from getting destroyed during bottoming. So during 99% of their lifetime the bump stops should stay inactive, just sitting there.





As for the front top strut bearing, at your actual mileage you should change the entire assembly meaning seat plus ball-bearing:
KB657.13.jpg



P.S. I strongly recommend to buy the above mentioned SPIDAN front springs substituting the Audi standard front springs prone to break frequently.
You will notice a 10 mm increase of car height at the front in case of Koni FSD due to their gas-pressure setup and strong compression damping characteristics. That lifting effect would be fine according to your statement...
 
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Thanks

Thank you very much for the Schnelle answer Mister Schnelletrecker. ;-)
I'll follow your advices about spidan and all the rest.

Do you confirm that the standard bump stop length is 75mm for the front and 127mm for the rear ?
 
How about the Spaidan spring codes for the Opensky TDI's? My local parts dealer told me that they have a different model for the cars equipped with Opensky.
 
trex said:
How about the Spaidan spring codes for the Opensky TDI's? My local parts dealer told me that they have a different model for the cars equipped with Opensky.
Click to expand...

Well the SPIDAN #49515 front springs are suited for all TDIs and FSIs including the OSS glass roof option and other weighty options (e.g. WEBASTO auxiliary heater etc). These #49515 Spidans can be used up to a maximum front axle load of 835 kg.

Besides, when using Koni FSD shocks the front will almost never bottom out due to the strong compression damping setting.


So in fact you could also use the Spidan # 49527 front springs with the TDIs or FSIs (if combined with Koni FSD). These # 49527 front springs feature less spring rate than #49515 and are used with the A2 1.4 petrols usually.

The advantage of mounting the # 49527 springs in an Koni FSD upgraded 1.4 TDI or 1.6 FSI would be the compensation of the 10 mm lifting effect induced by the FSD shocks at the front. :)

So A2 people switching to Koni FSD and setting value on nice looks (A2 front height equals back height) should take the # 49527 SPIDAN springs.

More SPIDAN springs info:
http://www.a2oc.net/forum/showthread.php?p=63326&highlight=spidan#post63326
 
Some pics of the frequently breaking front Audi springs (S-Line sports included).

These front spring failures occur within all weight ranges, meaning all engines are affected (from the 1.2 to the 1.6).

The torsional fracture pattern is always the same...

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Hello Schnelletrecker

In previous post #26 you give a link to more info about Spidan springs.
There is written:

For A2 1.4 petrol:
  • Front: SPIDAN # 49527
  • Rear: SPIDAN # 49546
For A2 1.4 TDI (all) and 1.6 FSI:
  • Front: SPIDAN # 49515
  • Rear: SPIDAN # 49546

So I'm confused with this and your post #26, where you say to use 49527 in front for a 1.6FSI :confused:

On autoteilebox.de I can only found the 49515.
My conclusion on all those postings: both 49515 and 49527 are suited for a 1.6, but use 49527 if you don't want an uplifted A2 (and there is no need to shorten bumpstops).

(I think I am probably beginning to understand al those posts about FSD, springs etc etc.)

cu,
Louis
 
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Louis said:
My conclusion on all those postings: both 49515 and 49527 are suited for a 1.6, but use 49527 if you don't want an uplifted A2 (and there is no need to shorten bumpstops).

cu,
Louis
Click to expand...

Yes, your conclusion is correct. :)

The Spidan front springs # 49527 coming with less spring rate than # 49515 can also be used without the danger of bottoming in heavier A2s than 1.4 petrol - if you combine them with Koni FSD shocks!


Calculation:
  1. The FSDs are known to raise the A2s front by about 10 mm average.
  2. The weight difference between the 1.4 petrol engine and the 1.4 TDIs or 1.6 FSIs is about 60 kg.
  3. Assuming a realistic stock spring rate of about 5 to 6 kg/mm at the front axle per spring, the TDI or FSI engine weight will compress the # 49527 Spidan springs more than # 49515.
  4. So at least 5 mm of FSD induced lift will be compensated by using the # 49527 springs.
Let's remember: Spidan springs are identically wound, come with identical free spring length and same characteristics than the Audi stock springs. So the original bump stop length remains untouched.





However, A2 drivers like trex or ariles seem to like increased car height in order to cope with even extremely bad road surface conditions (avoiding ground touching of the undercarriage trim).
For them better looks (front and rear height equal) probably is quite unimportant. ;)

So they – as TDI drivers upgrading to FSD - should stick with the # 49515 SPIDAN springs.
 
The French branch offices (for ariles) of GKN/Spidan - they will let you know the car shops distributing GKN products in France:

GKN Driveline Carrières
GKN Glenco SA
170 Rue Léonard de Vinci
78955 Carrières sous Poissy

GKN Driveline Ribemont
GKN Glenco SA
7 Rue de la Briqueterie
02240 Ribemont




The Dutch branch office of GKN/Spidan (for Louis):

GKN Driveline Amsterdam
GKN Service Benelux BV
Haarlemmerstraatweg 155-159
1165 MK Halfweg




The GKN office of Romania (for trex):

Peter Brezina
phone: +43 (0) 1616 38 80 52
fax: +43 (0) 1616 38 80 15
[email protected]





Here's more SPIDAN supplier contact info for international A2 drivers:

http://www.gknservice.com/global/passenger_cars/contact.html




Last not least another “broken spring” thread:
http://www.a2oc.net/forum/showthread.php?t=9338
 
Wow, that's incredibly helpful, thanks.:D
I'll probably contact them monday to find out the details.
 
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