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SCCA Street Touring discussion/setup (Formerly Street Touring Hatchback STH)

krs

Autocross Champion
Location
Las Vegas, NV
Car(s)
MKVIIS R
Hey guys, just wanted to share my current STU (BST :rolleyes:) setup and see if anybody has any tips/ advice. Car is currently pretty competitive locally as I took home 1st last season. But always down to see what can be done to make the car better.

2015 R DSG
-APR STAGE 2 high torque
-APR DSG tune
-APR carbon fiber intake
-APR stock location intercooler
-Bilstein B8s (new for 2025 season)
-034 camster mounts
-VWR springs
-H&R front and rear sway bars (both on full stiff)
-Girodisc rotors front and rear
-EBC yellow stuff pads
-CTS turbo muffler delete
-CTS resonator delete
-USP catted downpipe
-18x8.5 Motegi MR140 with 255/35 V730s

Car is a more than excellent street car at the moment as I drive it as much as possible on the road. Also curious if I will see much of a difference going to a narrower tire on the 18x8.5 wheels? I've got probably half a season left on the Kumhos and then I will need to get a new set. Should I get a 245/40?

Pretty similar type setup as I had for a bit for STU. Your shocks and springs are weak, but depends on what you’re going for and what your competition is.

I’d look into the haldex tune, I feel it was value added for me.

Here’s my alignment. My caster is a tad unbalanced as the offset bushings are tedious to fine tune and match up.


IMG_5944.jpeg
 

codeskilla

New member
Location
Arkansas
Car(s)
Mk7 R
Pretty similar type setup as I had for a bit for STU. Your shocks and springs are weak, but depends on what you’re going for and what your competition is.

I’d look into the haldex tune, I feel it was value added for me.

Here’s my alignment. My caster is a tad unbalanced as the offset bushings are tedious to fine tune and match up.


View attachment 315937
Haldex tune is DEF on the list. Waiting to hear what APRs tune will be as they’re claiming it’s supposed to be “different” from the rest.

You feel like the toe in the rear helps with cornering? Any noticeable difference in tire wear?
 
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krs

Autocross Champion
Location
Las Vegas, NV
Car(s)
MKVIIS R
Haldex tune is DEF on the list. Waiting to hear what APRs tune will be as they’re claiming it’s supposed to be “different” from the rest.

You feel like the toe in the rear helps with cornering? Any noticeable difference in tire wear?

I can’t speak to any of the controllers, ore even any other tunes as I didn’t know there were any, but I went with the United Motorsports haldex tune. I did it between a two day event for comparison, and it was notice enough that I’d rule out straight placebo.

When I went from 0° toe to what it is now, I did notice the ability to get the rear to rotate easier. I can’t speak to tire wear, my race tires wear like crazy, but they’re rotated after each event and flipped mid season. My street tires rarely get driven on, but even then they’re rotated whenever I swap on the race wheels. But from what I’ve observed, I have nothing abnormal that I can tell.

I have a STU thread in here with my progression and challenges. It’s nothing earth shattering, but there’s been a few things I’ve had to correct.
 

scrllock

Autocross Champion
Location
MI
Haldex tune is DEF on the list. Waiting to hear what APRs tune will be as they’re claiming it’s supposed to be “different” from the rest.

You feel like the toe in the rear helps with cornering? Any noticeable difference in tire wear?
If anyone has the ability to actually reverse the haldex maps and produce something unique, it's APR.

Fun fact: the current file that everyone else is selling is just the RS3 tune. Someone figured out a way to flash the haldex and made it public and--suddenly!--everyone has a haldex tune, lol.
 

tigeo

Autocross Champion
If anyone has the ability to actually reverse the haldex maps and produce something unique, it's APR.

Fun fact: the current file that everyone else is selling is just the RS3 tune. Someone figured out a way to flash the haldex and made it public and--suddenly!--everyone has a haldex tune, lol.
United's tune is this?
 

xXDavidCXx

Autocross Champion
Location
AZ
Car(s)
2017 GTI SE DSG
Haldex tune is DEF on the list. Waiting to hear what APRs tune will be as they’re claiming it’s supposed to be “different” from the rest.

You feel like the toe in the rear helps with cornering? Any noticeable difference in tire wear?
Rear toe in does not help with rear cornering, toe-in is a stabilizing alignment, just like stock.
 

tigeo

Autocross Champion
most likely
You think APR pulled one to verify or is just hypothesized? United tune has been around forever/OG. Really just a torque limiter remover so it could make sense using the RS3 one which would have a higher torque limit. I'm curious about the details of the APR one when it is released ad I think it's likely a bit more than just the torque limit and sounds like it may be customizable. United one works well enough at this point for me for basic track stuff. I know the TZ one shows the same software version as stock when you look (buddy has it and shared); United has a different "UM" number.

1000027496.jpg
 

scrllock

Autocross Champion
Location
MI
You think APR pulled one to verify or is just hypothesized? United tune has been around forever/OG. Really just a torque limiter remover so it could make sense using the RS3 one which would have a higher torque limit. I'm curious about the details of the APR one when it is released ad I think it's likely a bit more than just the torque limit and sounds like it may be customizable. United one works well enough at this point for me for basic track stuff. I know the TZ one shows the same software version as stock when you look (buddy has it and shared); United has a different "UM" number.

View attachment 315959
it's not a torque limit, it's a PWM limit (haldex pump duty cycle). Very easy to log and see if the PWM curve looks identical to the RS3 files people are running. Will know for sure soon.
Tunezilla put the absolute least effort possible into theirs, which is how it was discovered so quickly.

krs said:
]Why would they have a tune for the RS3/TTRS then, if it were just a RS3 tune?

There are plenty of Haldex calibrations out there (including VAQ controllers, which are physically the same module), if they are actually selling a different file it's possible that it's just a more aggressive one. Or it's snake oil. Or maybe their 3-man shop had a controller with no leaked definition files fully mapped out 6 years before everyone else.
 
Last edited:

tigeo

Autocross Champion
it's not a torque limit, it's a PWM limit (haldex pump duty cycle). Very easy to log and see if the PWM curve looks identical to the RS3 files people are running. Will know for sure soon.
Tunezilla put the absolute least effort possible into theirs, which is how it was discovered so quickly.
I think APR is pointing at TZ for this, not United. Have you seen this log I collected before/after the UM tune? This is logged using OBDEleven, brake module, awd channel, "nM" logging parameter. More estimated torque out past first gear way out until probably 80mph or so. These are 0-100mph WOT pulls. I have logged the PWM before so % closed, I don't recall any differences but can go back and see if I have before after logging Haldex activity %/duty. I included a Simos log of PWM on track.

Haldex tune graph.JPG

Haldex_VIR.JPG
 

xXDavidCXx

Autocross Champion
Location
AZ
Car(s)
2017 GTI SE DSG
I’m pretty sure he said toe in the rear, not toe-in, referring to my toe-out alignment.
I'm 99% sure, from the pic you posted, that you have rear toe-in, as evidenced by the green color for that adjustment. If you had toe-out, it would be red, because toe-out is outside of OEM spec. It often is also a negative number when out.
 
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