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

[krs]

I used these rims for a while.
https://www.tirerack.com/wheels/Whe...n&autoYear=2018&autoModel=Golf+R&autoModClar=

They were a lot cheaper several years ago, and they weighed just over 18lbs. Not super light, but not heavy either.

Edit: Where I was going with that, is you don’t always need the most baller wheels to get started. Motegi is a cheap wheel, you can usually find them used for a pretty low price.

 

[GTIfan99]

This time around, I'm going to go SM10 18 x 9. I want to leave a little room for a future brake upgrade.

 

[DerHase]

245/40R17 was much better than 255/40R17 in my experience. (All V730s on 17x9 wheel)

It was a much bigger difference in steering feel than I'd expected.

The shorter tire has a LOT better acceleration and more consistent lateral G max.

If you plan on codriving I do wonder if the 255s would be best (at least up front) because it would be harder to overheat them. This has been an issue with an overly aggressive codriver on 245/40R17 RE71RS this year.

I'd consider 18x9 and 245s specifically if you have intentions of tracking the car a lot to make room for a 370mm+ BBK.

If you have dumb money to spend, AP Racing 9660 355mm BBK will fit under Apex 17x9 wheels AND drop something like 40lbs off the front of the car. Best of both worlds but the consumable cost of rotors and pads is outrageous when the time comes (jury is out how long stuff would last).

 

[mrmatto]

I’m surprised there’s a noticeable difference going from 255 to 245. Will probably try that size on my next set if I stay in STH.

 

[DerHase]

I’m surprised there’s a noticeable difference going from 255 to 245. Will probably try that size on my next set if I stay in STH.

I want to say @GTIfan99 noticed the same thing.

 

[krs]

I went from a 245/40 to 255/35, can’t say I noticed a single thing other than paying more for the tire.

I wish I had the finely calibrated butt sensors to be able to tell the difference.

 

[GTIfan99]

I went from a 245/40 to 255/35, can’t say I noticed a single thing other than paying more for the tire.

I wish I had the finely calibrated butt sensors to be able to tell the difference.

The gearing in the R is lower, so you likely don't feel it like we do. 70 mph at top of second gear is really long. 245 40 17 is 3% difference for us.

 

[DerHase]

I went from a 245/40 to 255/35, can’t say I noticed a single thing other than paying more for the tire.

I wish I had the finely calibrated butt sensors to be able to tell the difference.

You're also on an 8.5 wide wheel right?

The most notable difference was in forward acceleration. It was especially noticeable when I was playing around with launch control settings and trying to get the car to hold a constant 0.6G or so (because wrong wheel drive problems). The 255s were just never able to get off the line as strong. Which is more to do with the shorter tire height than anything... which a 245/40R18 to 255/35R18 isn't going to reproduce.

edit: Also as @GTIfan99 mentioned... the R gearing is considerably better to start with.

This was from track, not autocross but I was able to quantify a consistent max mph difference between the two sizes at VIR earlier this year. And this is only the front tires being changed FWIW:

 

[krs]

You're also on an 8.5 wide wheel right?

The most notable difference was in forward acceleration. It was especially noticeable when I was playing around with launch control settings and trying to get the car to hold a constant 0.6G or so (because wrong wheel drive problems). The 255s were just never able to get off the line as strong. Which is more to do with the shorter tire height than anything... which a 245/40R18 to 255/35R18 isn't going to reproduce.

edit: Also as @GTIfan99 mentioned... the R gearing is considerably better to start with.

This was from track, not autocross but I was able to quantify a consistent max mph difference between the two sizes at VIR earlier this year. And this is only the front tires being changed FWIW:

View attachment 312098

Yeah, guess I don’t think of the differences in gearing, or other factors enough.

I’m on a 9” wheel.

 

[GTIfan99]

Update on the VAQ issue. Just VW doing VW things. Thanks to Matt for helping me out.

It appears that even though the car stays in Sport visually on the mod screen, you have to switch out of it, then back into it for the VAQ to function in correctly. So annoying.

Stupid VW. Anyway, this thing has so much more power than mk7.5, also with an EQT stg 1 tune.

I think when Cobb finally finishes spark based TC, I'm going to get a custom tune with more linear throttle curve. This thing just lights up the tires on corner exit. Didn't have that issue with the mk7.5.

 

[scrllock]

Update on the VAQ issue. Just VW doing VW things. Thanks to Matt for helping me out.

It appears that even though the car stays in Sport visually on the mod screen, you have to switch out of it, then back into it for the VAQ to function in correctly. So annoying.

Stupid VW. Anyway, this thing has so much more power than mk7.5, also with an EQT stg 1 tune.

I think when Cobb finally finishes spark based TC, I'm going to get a custom tune with more linear throttle curve. This thing just lights up the tires on corner exit. Didn't have that issue with the mk7.5.

cobb never finished spark-based TC on the mk7, i wouldn't hold your breath

 

[GTIfan99]

cobb never finished spark-based TC on the mk7, i wouldn't hold your breath

Are you sure? I selected it when buying my mk7.5 tune. It only worked when factory TC was turned fully off, but it worked.

 

[scrllock]

Are you sure? I selected it when buying my mk7.5 tune. It only worked when factory TC was turned fully off, but it worked.

they never added wastegate compensation, so when you pull timing due to TC intervention, it overboosts. it's fine on some cars but bad enough to throw an EPC on others. seemed slow to kick in for me, too. plus cobb can't fully disable factory TC, some torque intervention is still allowed even with ESC fully off.

switchpatch addresses both of these issues. doesn't help you on the mk8 yet but after experiencing polished spark-cut TC the cobb implementation is really half-assed.

 

[GTIfan99]

they never added wastegate compensation, so when you pull timing due to TC intervention, it overboosts. it's fine on some cars but bad enough to throw an EPC on others. seemed slow to kick in for me, too. plus cobb can't fully disable factory TC, some torque intervention is still allowed even with ESC fully off.

switchpatch addresses both of these issues. doesn't help you on the mk8 yet but after experiencing polished spark-cut TC the cobb implementation is really half-assed.

Gotcha. On the stock turbo, on the default setting from EQT, I never had issues and it worked decent enough for autocross.

 

[mrmatto]

they never added wastegate compensation, so when you pull timing due to TC intervention, it overboosts. it's fine on some cars but bad enough to throw an EPC on others. seemed slow to kick in for me, too. plus cobb can't fully disable factory TC, some torque intervention is still allowed even with ESC fully off.

switchpatch addresses both of these issues. doesn't help you on the mk8 yet but after experiencing polished spark-cut TC the cobb implementation is really half-assed.

*swishpad