2021 STU Discussion

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Oct 22, 2021 | 03:56 PM
  #181  
So I totally forgot to mount the RT660 on an 11" wheel today, but here's what I have so far:

285 CR1 - 10"




285 CR1 - 11"



285 - 10" comparison - basically dead even. Might be a MM or two difference:





285 CR1 - 11" vs 295 A052 - 11" - Pretty damn close! I know the treadwith was practically equal. Section width the A052 is wider.




285 RT660 - 10" / 285 CR1 - 10" / 285 CR1 - 11" / 295 A052 - 11"

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Oct 26, 2021 | 06:48 AM
  #182  
Looks like Kumho released a few new sizes in the V730....no specs on them yet. Hoping for a 285/30/18...

https://www.tirerack.com/tires/tires...del=Ecsta+V730
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Oct 26, 2021 | 08:11 AM
  #183  
That 285 RT660 looks wider and shorter than the CR1 on. Makes the 295 A052 look super tall (I know its 1/2" taller).

Heh, I pulled the 265 RE71s off the Tesla this weekend while I pull things apart and they just look tiny compared to what Im use to now on the evo.
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Oct 26, 2021 | 10:37 AM
  #184  
Quote: That 285 RT660 looks wider and shorter than the CR1 on. Makes the 295 A052 look super tall (I know its 1/2" taller).

Heh, I pulled the 265 RE71s off the Tesla this weekend while I pull things apart and they just look tiny compared to what Im use to now on the evo.
That final pic I posted is a little deceiving as I believe the RT660 was sitting a little bit forward which makes it look shorter. It is used as well. But it's looks very much similar when mounted vs the CR1. The sidewall is just a different design it seems.

When you going to throw some real meat on that thing?
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Oct 29, 2021 | 05:16 PM
  #185  
Hi guys,

I have been away from racing for a while and I can see lots of changes happen in the last few years. Bigger tires, clutches, pressure plates, software for everything,...kind of crazy when I think just a few years back most of these new things where no go!

Since I have been trying a bit in D-Street for a while, I always looked at the STU as next much funnier step. With all these rule changes how does EVO X stands nowadays compared to the earlier versions?

Thanks!
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Oct 29, 2021 | 06:27 PM
  #186  
Yes, they've finally made some good changes to this class. So many different chassis in this class could win a tour/national championship, IMO of course. Obviously the STI, E92 M3, Evo 8/9/10, 370/350z, Fiata, the list goes on.

I don't see why the X wouldn't be toward the peaky end of things with the right driver. I'd be shocked if you couldn't easily fit a 295 A052 on a proper wheel width all the way around. Unsure of what wheel widths would work for that.... I've thought quite seriously about building one, but I'd like to get a truck/hauler prior to going down that road.
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Oct 29, 2021 | 08:04 PM
  #187  
I did go quickly over the rules and it looks like clutches and PP are free. Couldn't see anything about multi plate clutches there...it looks like we could use different ones, but I am not sure if we could add more plates there...
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Oct 30, 2021 | 06:26 AM
  #188  
What offset wheels are best F & R on each particular width wheel?
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Oct 30, 2021 | 06:31 AM
  #189  
Quote: I did go quickly over the rules and it looks like clutches and PP are free. Couldn't see anything about multi plate clutches there...it looks like we could use different ones, but I am not sure if we could add more plates there...
Agreed, it's quite vague: "The clutch disk and pressure plate may be modified or replaced" But I'd assume it is only allowing you to replace it with a single disk clutch.

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Oct 30, 2021 | 06:32 AM
  #190  
Quote: What offset wheels are best F & R on each particular width wheel?
Could you clarify a bit?

Are you asking what wheel widths/offsets work best? Are you asking for a 8/9 or 10?
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Oct 30, 2021 | 08:15 AM
  #191  
Quote: Agreed, it's quite vague: "The clutch disk and pressure plate may be modified or replaced" But I'd assume it is only allowing you to replace it with a single disk clutch.
If it doesn't say you can, you can't. Also worth noting that the flywheel cannot be changed. Multi disc clutches are not allowed in STU.
Reply 2
Oct 30, 2021 | 09:02 AM
  #192  
Would a twin-disc even have any advantage at STU power levels? Seems like more expense, more complication, and more rotating mass that isn't necessary.

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Oct 30, 2021 | 09:41 PM
  #193  
Quote: If it doesn't say you can, you can't. Also worth noting that the flywheel cannot be changed. Multi disc clutches are not allowed in STU.
So, what do we do with DCT in Evo X? Not allowed for the class?
I am getting there to replace mine (almost 90k there) and adding an extra pair of OEM plates (or two, can't remember this part) helps apparently. I guess, letter would need to be written....
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Oct 31, 2021 | 03:47 AM
  #194  
Quote: Could you clarify a bit?

Are you asking what wheel widths/offsets work best? Are you asking for a 8/9 or 10?
Evo 9. Currently standard arches but ready to get to work rolling and pulling. Presuming we need different offsets front and rear for clearances?

18x9.5
18x10
18x10.5
18x11
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Oct 31, 2021 | 07:20 AM
  #195  
Quote: So, what do we do with DCT in Evo X? Not allowed for the class?
I am getting there to replace mine (almost 90k there) and adding an extra pair of OEM plates (or two, can't remember this part) helps apparently. I guess, letter would need to be written....
Oh, that kind of multi plate clutch. I don't see any allowances to modify clutches in automatic transmissions. I'd write a letter.
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