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2021 STU Discussion

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Old Oct 22, 2021, 03:56 PM
  #181  
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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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Old Oct 26, 2021, 06:48 AM
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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
Old Oct 26, 2021, 08:11 AM
  #183  
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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.
Old Oct 26, 2021, 10:37 AM
  #184  
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Originally Posted by Dallas J
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?
Old Oct 29, 2021, 05:16 PM
  #185  
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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!
Old Oct 29, 2021, 06:27 PM
  #186  
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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.
Old Oct 29, 2021, 08:04 PM
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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...
Old Oct 30, 2021, 06:26 AM
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What offset wheels are best F & R on each particular width wheel?
Old Oct 30, 2021, 06:31 AM
  #189  
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Originally Posted by MrAWD
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.

Old Oct 30, 2021, 06:32 AM
  #190  
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Originally Posted by TimC909
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?
Old Oct 30, 2021, 08:15 AM
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Originally Posted by LV///R
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.
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Old Oct 30, 2021, 09:02 AM
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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.

Old Oct 30, 2021, 09:41 PM
  #193  
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Originally Posted by griceiv
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....
Old Oct 31, 2021, 03:47 AM
  #194  
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Originally Posted by LV///R
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
Old Oct 31, 2021, 07:20 AM
  #195  
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Originally Posted by MrAWD
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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