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S2000 STR prep resource

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Old Sep 22, 2011 | 09:33 PM
  #4651  
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Originally Posted by mLeach
Originally Posted by Random1' timestamp='1316745294' post='20997609
[quote name='mLeach' timestamp='1316732350' post='20997069']
www.treadzone.com

get the 255s. they're in stock.
R-S3s or Star Specs are in stock? How do you know?
Rs3. I just ordered some. Showed up today.
[/quote]
Awesome! Thanks. I need some now.
Old Sep 23, 2011 | 02:33 AM
  #4652  
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Good info from all. Thanks, Its good to see what others are observing to sanity check mine. The 245 RS3 definitely heats up quicker. My relative pax results at local events don't seem to have been affected much going to the 245, but back to back testing is always a better measure. I may wait and base my next tire choice on where they send me next (should have and idea on where I am going by march, which is about when i predict these 245 Kooks to be about dead) Because, from these observations, if Im going to a more temperate climate (im in florida), and can only have one tire, it is easier to spray the Dlops on hot days, than try to heat the Kooks on cool days, opposed to another hot climate where the RS3's may be best.
Old Sep 23, 2011 | 05:45 AM
  #4653  
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Originally Posted by Random1
Originally Posted by Forcednduckshn' timestamp='1316746123' post='20997637

Glagola also found the same to be true on the test course.

I speculate that there is little difference in the ultimate pace of the tires, but I feel compelled to think the RS3, in the right temperatue zone is going to generate the most grip. I have no datalogging to back this up, but would relish the opportunity. The operating temps of each tire are the big differentiator. The toyos love to be ambient, the hankooks need more heat than a hoosier A6 to work at their peak. The Dunlops seem to be in the middle from my experience. When I ran Dunlops on my B-stock ap1, they would definitely fall off with large amounts of heat. So it's a pick your poison kind of thing. The feel and feedback is where the tires differ greatly. Matt said he really liked the feel of the dunlops. I like the feel also, it's more like a conventional street tire with a lot of "vibration" at the limit. The RS-3 has r-comp feel, all grip then a quick drop off and much less vibration. Though with the RS-3's, you'll likely get 3 really good cracks at the course with a codriven car. The Dunlops will likely need more attention with a sprayer, still more with the Toyo's, which in my personal experience, are fastest with almost no heat. This is why the light cars (NA/NB Miatas, even NC's)love them.

Nick
Maybe the stiffer side wall of the Dunlop can be attributed for making more grip on the Lincoln concrete. They always feel good, but maybe that surface allowed them to make better grip. We ran more compression on all corners at Lincoln and it worked great (R-S3s). Maybe there's a relationship here between the stiffer sidewall and more compression force? Are they similar in affect in this case?

Good description of the tires Nick, I agree.
Thx Rob.

I think you might be on to something with the stiffer sidewall thought process. Generally speaking, a "stiffer" setup should work better on a higher grip surface. So if the setup is developed on a lower grip surface, running more bump may have a good effect, and with the stiffer sidewall increasing the "wheel rate", it would be another step in the right direction.
Old Sep 23, 2011 | 06:07 PM
  #4654  
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As promised pics and video of exhaust. Although cell phone after dark kinda sucks. Plus the mic on these things isnt great. It cant produce the lows that the exhaust does. With that in mind: (Honestly listening to every other s2000 single on youtube, it sounds exactly the same.)


Exhaust 1
Exhaust 2
Exhaust 3



Old Sep 23, 2011 | 06:52 PM
  #4655  
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Thanks. Sounds pretty loud from what the video sounds like, especially at idle.

I may buy one as a starting point for a new exhaust and put one of those light weight (2.5 lbs) stainless quiet 2-stage racing mufflers on there.

Old Sep 23, 2011 | 07:02 PM
  #4656  
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Yup and thats always an option. It is good piping that i could always have another muffler welded to. Hell i bet i couldnt get another set of pipes bent and flanged for what paid for this exhaust.
Old Sep 23, 2011 | 07:05 PM
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It loud when opened up and drones at certain resonance frequencies. However at idle you cant hear it at all in the car and when on neutral cruising throttle its unremarkable. I imagine with the silencer thats provided its pretty quiet.
Old Sep 23, 2011 | 08:07 PM
  #4658  
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From the October SCCA FastTrack... this is all that related to ST.

- ST, pedal kit (#5350) This change is not seen as consistent with ST preparation philosophy.
- ST, axle spacer (#5550) This change is not seen as consistent with ST preparation philosophy.
- ST, aftermarket LSD, STR (#5552) This take back is not believed to be necessary.


Nothing too remarkable.
Old Sep 23, 2011 | 08:23 PM
  #4659  
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any news on the ecu rule change?
Old Sep 24, 2011 | 03:39 AM
  #4660  
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ST, axle spacer (#5550) This change is not seen as consistent with ST preparation philosophy.

What exactly is this referring to? Axle spacers are not allowed? I did a thorough search of the rules and found no mention of this anywhere. Could someone clarify.

Also: All components between the engine and the mounting structure are
considered to be part of the motor mount assembly and therefore
comprise the motor mount.

I am assuming this means I cant run my engine torque damper? Or is this a gray area too?



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