SS Presents: Subframe spacers on your multilink Nissan!
DILLIGAF
Joined: Oct 2003
Posts: 140
Likes: 0
I am not arguing shit...stating a point. One minute Matt is saying that they bind the subframe directly to the chassis...the next I am told they just preload the bushing...so what one is it because I honestly want to know. I am not saying that every car out there will drop its subframe due to a lack of bushings...but I can tell you that if you started dropping subframes out and checking them you would be suprised to see how many are fractured. So back to my question....do they mearly preload the bushing...or does it turn it into a fully metal on metal system?
TR Balla Donor Supreme
Joined: Jul 2000
Posts: 1,714
Likes: 0
there are subframe spacers which take all the air gaps out of the bushings and compresss the rubber down very tightly so that ther is almost no movement from the bushing at all.
and there are solid metal Subframe mounts which replace the rubber bushing all together with solid aluminum replacements
matt installed spacers. while they still leave the rubber bushing in the subframe they do severely pre-load the rubber allowing for a much tighter rear end.
the reason that manufacturers dont do this (or solid mounts) form the factory is noise...not stress fracture. with merely the installation of the spacers you can hear all sorts of noise now being transmitted though the chassis that wasnt present before. things like ring gear lash...are easily noticiable in the car now. the factroy engineers do spend alot of time on these types of things...but they are stuck in a paradox of compromise. theya re not allowed to think "best perfromance"...they have to think "best perfromance with specified noise allowance". these are 2 very different thought processes that will lead to very different design results.
and there are solid metal Subframe mounts which replace the rubber bushing all together with solid aluminum replacements
matt installed spacers. while they still leave the rubber bushing in the subframe they do severely pre-load the rubber allowing for a much tighter rear end.
the reason that manufacturers dont do this (or solid mounts) form the factory is noise...not stress fracture. with merely the installation of the spacers you can hear all sorts of noise now being transmitted though the chassis that wasnt present before. things like ring gear lash...are easily noticiable in the car now. the factroy engineers do spend alot of time on these types of things...but they are stuck in a paradox of compromise. theya re not allowed to think "best perfromance"...they have to think "best perfromance with specified noise allowance". these are 2 very different thought processes that will lead to very different design results.
They call me "CHAN"
Joined: Sep 2003
Posts: 371
Likes: 0
Hello,
I'm about to order these subframe spacers http://www.powertrix.com/s13spacers.JPG
Do these serve the same purpose as the one that you installed, mattback?
Thanks
I'm about to order these subframe spacers http://www.powertrix.com/s13spacers.JPG
Do these serve the same purpose as the one that you installed, mattback?
Thanks
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