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PCA Track Day Aug 5th - Sunday Late Start

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Old Aug 6, 2007 | 07:59 PM
  #16  
justlooking's Avatar
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Originally Posted by dbsears87
How was the body roll with 255's RA1s with your suspension. I am contemplating those tires or 265/35/18 RE01R but I am curious if the Swifts work well with that size tire. It seems now that I have minimal to little body roll and the tires break away first but that may be because I have bald advans at 20k miles
Oh, it still rolls. It probably rolls more then my s2000 did stock, but it's better. But, if you are smooth and let it settle it's fast. If you want track tires the RA1s are a lot better then any street rubber. You might rub with 265s. I had RA1s with my stock IX suspension and the MRs with swifts roll less.

The problem with the mcpherson setup is when you lower the car you actually increase the car's body roll and the tendency for it to lift a tire. But, the bigger sway bar and slightly stiffer swift spring rate helps to cancel that out. I think the net is approx the same or a little less body roll. The lower CG lets you go a little faster though I think. But, the length between the CG and roll center actually gets longer compared to stock.

From someone who knows more then me:
So, when you lower the car's CG, the total lateral load transfer for a given lateral G decreases. But, if the roll center decreases at a greater rate than the CG (which it dos on a mcpherson setup), then the moment arm between them increases, and this increases the rolling moment for a given TLLT.
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Old Aug 6, 2007 | 08:44 PM
  #17  
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I think I may look into the roll correction kits and the bump steer bushings that robispec sells. Sounds like it might help...I will find out soon though with the upcoming track days how I like the setup. I really enjoy it on the street though. Thanks for the feedback...just trying to see how others like similiar setups in the NW
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Old Aug 6, 2007 | 08:46 PM
  #18  
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Originally Posted by dbsears87
I think I may look into the roll correction kits and the bump steer bushings that robispec sells. Sounds like it might help...I will find out soon though with the upcoming track days how I like the setup. I really enjoy it on the street though. Thanks for the feedback...just trying to see how others like similiar setups in the NW
If you have experience on track your setup will be faster then most cars out there. I only got passed once in advanced on Sunday and I'm at stock HP levels.
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Old Aug 7, 2007 | 05:55 PM
  #19  
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Very nice driving - you were definately braking later and hitting your apexes better than Mr. fire-spitting-Porsche!

What brake pads were you using?
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Old Aug 7, 2007 | 06:37 PM
  #20  
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Originally Posted by aeroweenie
Very nice driving - you were definately braking later and hitting your apexes better than Mr. fire-spitting-Porsche!

What brake pads were you using?
Cobalt Friction XR2 front
Carbotech XP8 rear

I like the cobalt friction pads a lot. The carbotechs are fine, but the cobalt friction are my favorite. Yeah, I'm not sure why he was having such a hard time with the braking zones. He was going a lot faster so that's part of the reason he was braking so early into 1, but he was going a lot slower through 10-11. That car is pretty old it might not have the great suspension geometry. I don't know much about Porsches.
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