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Old 09-16-2019, 12:01 PM   #1376
LehmanZ06
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I’m guessing that the diffs on the track don’t mean that much better for STI vs WRX, on a dry track......,,,,wet track or low grip surface like gravel or a dirt road maybe more of a difference.
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Old 09-16-2019, 07:54 PM   #1377
JasonS82
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Quote:
This.

In general, fix front grip first before trying to fool the car into thinking it's neutral or oversteerish by throwing away rear grip.
I agree and that is in the plans as well. My thought is that the coilovers will allow me to run more negative camber (hoping to get close to -3.5) in the front since it is limited by the spring perch hitting the inner fender well on the stock struts. Ill be combining that with a roll center kit as well. I'm still undecided on a fr sway just due to the info on this thread. Almost seems like Subaru got it right the first time, imo, but I haven't tried one myself so who knows for sure. Maybe run a smaller front bar and rely on the roll center kit to help prevent roll?
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Old 09-17-2019, 09:42 AM   #1378
Norm Peterson
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Quote:
Originally Posted by JasonS82 View Post
I agree and that is in the plans as well. My thought is that the coilovers will allow me to run more negative camber (hoping to get close to -3.5) in the front since it is limited by the spring perch hitting the inner fender well on the stock struts. Ill be combining that with a roll center kit as well. I'm still undecided on a fr sway just due to the info on this thread. Almost seems like Subaru got it right the first time, imo, but I haven't tried one myself so who knows for sure. Maybe run a smaller front bar and rely on the roll center kit to help prevent roll?
There's two things going on with coilovers vs "big springs" as far as more negative camber is concerned - spring to tower clearance and lowering. I think we need to separate them. This is mainly a MacPherson/Chapman strut matter.

That coilovers give you more room for negative camber is not only good from a static camber point of view; it also puts the geometry such that camber gain in bump / camber recovery in roll improves slightly.

But whether with coilovers or "lowering springs", lowering works the other way, with camber gain in bump (from the new static ride height) decreasing. I have a feeling that so many people whose cars have strut suspensions run such large negative camber values is at least partly tied to this effect as well as to a lack of roll center correction.

OE bumpsteer tends to get hosed with roll center correction, so RC correction is reason in and of itself to plan on doing bumpsteer correction as well.


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Old 09-18-2019, 12:15 PM   #1379
violentleaf
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Whiteline sells a roll center and bump steer correction kit. Would you recommend that? Or another brand?

And at what did height drop would you recommend these corrections?
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Old 09-18-2019, 02:29 PM   #1380
Thorium06
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Those correction kits are not legal until SM, and once in SM there are much better ways to adjust the geometry FWIW
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Old 09-18-2019, 08:00 PM   #1381
violentleaf
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Oh OK I didn't know that it wasn't SP legal, guess I won't be going that route. I assume by better you also mean much more expensive?
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Old 03-02-2020, 04:16 AM   #1382
subeeroo
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Doing my first AutoX event this weekend in my 2017 WRX. Can't wait to see how it handles. Was great to see some feedback from others
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Old 05-18-2020, 01:43 PM   #1383
z06fun
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Does anyone know if the 2020 wrx requires tire pressure sensors to allow you to turn off the nannies?
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Old 05-21-2020, 10:10 AM   #1384
z06fun
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Maybe 2020 is too new and unknown. So how about the 2018+ last refresh? Are tire pressure sensors needed to turn off the nannies? I'm guessing you can only have one set programmed to the car at a time?
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Old 05-21-2020, 11:37 AM   #1385
Norm Peterson
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All I can find in the 2019 Owner Manual is this.

Quote:
Even when the Vehicle Dynamics Control OFF mode is selected, components of the brake control system may still activate. When the brake control system is activated, the Vehicle Dynamics Control operation indicator light illuminates.
While it doesn't say anything about TPMS, as far as I've been able to determine turning VDC off can still be accomplished even with a set of non TPMS-equipped wheels/tires.


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Old 05-21-2020, 05:00 PM   #1386
hackney1
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Quote:
Originally Posted by z06fun View Post
Are tire pressure sensors needed to turn off the nannies? I'm guessing you can only have one set programmed to the car at a time?

I run Autocross a lot with a 2018 WRX. I run aftermarket wheels without tpms sensors...there's no issue turning off traction control and vector control. (Anti-lock cannot be disabled)


One time (out of dozens) when I reinstalled the OEM wheels with tpms sensors the car forgot...dealer reset was covered under warranty.
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Old 05-25-2020, 03:26 PM   #1387
z06fun
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Thanks so much for the info, very helpful!
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