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Posted: Mon Feb 02, 2009 10:20 pm
by Merlin
Hey FJC,
Thanks for the info. In that case, I like sideload.
Getting my bug sideways is what it's all about. Hehe.
In your experience, can you feel a big difference between duals and singles, with regards to springplates?
I'll keep this thread updated as my bug [slowly] progresses.
Cheers, Nic
Duals
Posted: Tue Feb 03, 2009 9:31 am
by FJCamper
Cars I crewed for -- and won with
Hi Nic,
My experience with engineers and cost cutting tells me someone at VW said "We can save two spring plates per car if we go back to singles!"
My knowledge of suspension (all from Porsche-BMW-Mercedes) tells me the dual plates are much stiffer and better at locating the rear diagonal arm.
Porsche 911's use of a single plate tells me they wanted the springiness of the plate in flex, to allow the toe-in a semi-trailing arm creates as it moves. Rear toe-in creates understeer. This is a good thing in a VW or Porsche for most drivers.
However, a double spring plate is rigid, and would have to create much less toe, possibly even zero toe, as it moves. I like that, as it is consistent with the racing suspensions we had on our 930's.
With a set of good hard rear torsion bar and diagonal arm pivot mount bushings and dual spring plates, you have a very predictable rear end. Add to that the lower rear roll center of the IRS, and you have a first class setup.
It makes the single spring plates seem like a "learning suspension" before you get into a car with a pro arrangement.
FJC
Posted: Tue Feb 03, 2009 12:49 pm
by Spydaman
Nothing to add, but cool pics FJCamper.
Posted: Tue Feb 03, 2009 11:34 pm
by Merlin

Point taken, FJC.
We should start the car today! I'm so stoked.
I've ordered some exhaust wrap, to both insulate the pipes and protect the full-flow oil pipes, and my camber adjusters will be here in less than a month.
Thanks, Nic