Relentless Autosports Coilover package...

ChrisSlicks

That is the regular spring rate of the ER, 12K front, 10K rear.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Xan

Why are the shocks re-valved if it comes with the spring rates that the shocks were designed for?

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ChrisSlicks

In this particular case I have no idea, Scott will have to answer that one. It's not an uncommon practice, even at stock spring rates people often find they don't have enough adjustment at one end of the range for certain types of driving.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Scott @ RA

Thanks, and you are 100% correct, Chris. Great explanation.
We don't believe so much in a "one size fits all" coilover package, or a complete suspension package and set up for that matter.

Depending on each individuals needs, wants, feel, etc. We like to set the valving, or split valving in this case (with the ER's) for what would be in the optimal range of valving for both high speed and low speed valving on both the compression as well as the rebound side.

It all comes down to personal preference, supporting mods, wheels and tires used, what percentage of street/ track driving they do, how harsh or plush they want the ride, the intended use of the car, etc.

For example. In this particular case with Kirksters car... We took into consideration that his car is a roadster, that he didn't want to lower his car very much at all under factory height, that the car is mainly a street driven car that will see its fair share of track use, also that the car will see more autocross than longer tracks, etc......

Scott @ RA

Umm correction... The standard spring rates for the "off the shelf" BC Racing ER series coilovers is 10K front and 8K rear.

ChrisSlicks

According to BC NA last year the default spring rates for the "BR" is 10K/8K and the ER was 12K/10K. Did they change there default setup for 2010? Not that it really matters, the ER's are all custom orders anyway.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Scott @ RA

Sorry Chris, and not that it matters that much or is a big deal, but as some may not know... I talk to Pete (the owner, operator, and manager of BC Racing NA) at least couple times a week, not to mention the many daily text messages. We are good friends and work on projects together. I am also the consultant, director, and driver of their Time Attack cars and race cars (we also build the cars engines).

I asked him in a text message today if the 370Z ER series coilovers EVER came with the 12K front and the 10K rear spring rates as the default (off the shelf).
He replied.......
"No, we did sell many 12/10's ER's (ever since you suggested it), but that is not how they came and has never been the default spring rates. The 350Z, G35, 370Z, G37 have always had the 10K 8K spring rates as the default for the BR's as well as the ER's"

ChrisSlicks

Thanks for the follow up Scott, I had a feeling you were in pretty tight with Pete. I think I just had some old or mis-information from when the ER prototype came out for the 370Z. One of the prototypes was test fitted on Mike Bonnani's car, and at the time he was told the ER would be shipping with 12K/10K springs. But .. that was before it went into production. The UK website lists the spring rates as 10K/8K like you said.

As always, appreciate your support developing for this car as well as the diligence to the forums.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Scott @ RA

No problem, always glad to help out when I can, where I can.