Open Sky System suspension differences

MattSnap

Member
Hi there A2 Hive mind,
I have a question that I have been unable to discover after searching extensively through the suspension threads.

It relates as above to the differences in springs and dampers on open sky equipped cars.

Mine is a TDi 90 (which one might reasonably assume was on sport suspension with the 17" wheels) but in looking around for replacement springs and dampers, I am noticing suppliers listing springs/dampers as suitable or not suitable to OSS/Panoramic sunroof cars.

In the definitive suspension parts list I cannot fathom if there are part codes I have missed in searching for OSS specific parts, but I could just be overwhelmed with so much data.

For your information, I am thinking of going to Bistein B4 shocks front and rear (or possibly gas adjust rear shocks from KYB) with new top mounts all four corners, new bump stops and dust covers all round, new rear spring seats and Spidan 49527 rear spings and Sachs Coils for OSS cars up front.

What would be the advice fro those with OSS cars and the need for I assume more progressive springs to avoid sunroof flex and damage?

Many thanks folks,
Matt
 

carlston

Active Member
Hi there A2 Hive mind,
I have a question that I have been unable to discover after searching extensively through the suspension threads.

It relates as above to the differences in springs and dampers on open sky equipped cars.

Mine is a TDi 90 (which one might reasonably assume was on sport suspension with the 17" wheels) but in looking around for replacement springs and dampers, I am noticing suppliers listing springs/dampers as suitable or not suitable to OSS/Panoramic sunroof cars.

In the definitive suspension parts list I cannot fathom if there are part codes I have missed in searching for OSS specific parts, but I could just be overwhelmed with so much data.

For your information, I am thinking of going to Bistein B4 shocks front and rear (or possibly gas adjust rear shocks from KYB) with new top mounts all four corners, new bump stops and dust covers all round, new rear spring seats and Spidan 49527 rear spings and Sachs Coils for OSS cars up front.

What would be the advice fro those with OSS cars and the need for I assume more progressive springs to avoid sunroof flex and damage?

Many thanks folks,
Matt

Spidan 49527 are front springs not rear springs. Avoid Spidan as too many owners have had breakages with them.

OSS cars use slightly stiffer rear springs compared to non-OSS cars.

I suggest you use KYB RH3243 front springs and KYB RH6594 rear springs for your 1.4TDI with OSS (or maybe the Sachs option that I have listed towards the end of this post).

KYB RH3243 Front Springs (£14.84 each on ebay).



KYB RH6594 Rear Springs (£17.21 each on ebay).



If you prefer Sachs springs (although they are a little more expensive than KYB), the following is an option:

Front Springs for 1.4TDI with OSS
Sachs 997854 (matches OEM part number 8Z0411105AL)


Rear Springs for 1.4TDI with OSS
Sachs 996940 (matches OEM part number 8Z0511115BB)

 
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carlston

Active Member
Thank you so much for the advice Carlston

I've added some information in my first post on Sachs springs.

Comparing the KYB and Sachs options that I've listed in my first post...

Both KYB and Sachs rear springs should be similar.

The difference is in the front springs.

The KYB RH3243 front springs should be softer than the Sachs 997854 front springs. So if you want firmer front springs go for the Sachs springs, and if you want softer comfort front springs go for the KYB. I haven't listed the firmer KYB front springs because a couple of owners with the 1.4TDI have complained of a slightly high front end when fitted with KYB RH1664 front springs (these are the firmer KYB front springs that I haven't listed above).
 
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MattSnap

Member
Thank you both for such clear explanations. Wonderfully detailed.


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