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      10-18-2018, 04:29 PM   #23
TajoMan
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Quote:
Originally Posted by z3papa View Post
Sang -- this is Clark (red M3). I'd recommend running lower pressures than what you are using but that's your call. I run 33F/29R but admittedly am running either 275 square or 285 square as I have 18x9F/18x10R. A Bridgestone rep asked me my pressures at the Peru Nat'l tour and confirmed they designed this tire to be run at fairly low pressures with the stiff sidewall. In terms of picking up time, autocross is an exercise of transcending your perceived limitations of what you/your car can do. It's a learned skill which takes some time to develop. Driving/riding with faster drivers will only make you faster. If you want to do a grudge match on Saturday (ie 3 extra runs in my car), I'd be up for it but will disclose my tires are a bit worn but should be still fast.
Thanks for the tip.
I did ran 32psi front and back last time and it felt like I could even do 30 psi. I was kinda shocked how low I could go with this tire.

Weird thing is that I am not improving my time at all with this tire compare to MPSS (which I ran 45~48 psi in front).
I do need lots of ride along with fast drivers and see how they drive.
For sure, I don't know how to brake properly and put weight on proper tire.

I would love to do Grudge match with you but I already set up with my buddy on Saturday. (and I am not sure if I go on Sunday or not. If I do, I would do Grudge match with you)

See you on Saturday.
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      10-18-2018, 06:00 PM   #24
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Quote:
Originally Posted by TajoMan View Post
Thanks for the tip.
I did ran 32psi front and back last time and it felt like I could even do 30 psi. I was kinda shocked how low I could go with this tire.

Weird thing is that I am not improving my time at all with this tire compare to MPSS (which I ran 45~48 psi in front).
I do need lots of ride along with fast drivers and see how they drive.
For sure, I don't know how to brake properly and put weight on proper tire.

I would love to do Grudge match with you but I already set up with my buddy on Saturday. (and I am not sure if I go on Sunday or not. If I do, I would do Grudge match with you)

See you on Saturday.
I am only going to run Saturday as I have grandkids coming on Sunday. To be fair, I'm probably in the top 10 in FS Nationally, so competing with me locally is a bit of a challenge. That said, the key is whether turnout is strong enough for us to space fair enough apart for you to ride with me and me to ride with you without getting crazy. When I first started, I asked a much faster friend where I could get faster, and his response was "everywhere". Your car, while not on par with mine in class, is pretty capable. When I ran one in Spartanburg, they told me my times where only matched by "some" of their instructors. They literally were chuckling over the radio when the first time came in disbelief.
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      10-20-2018, 06:22 PM   #25
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Well today Tajoman really stepped up his game after riding with me on my first sketchy run. I was quite proud of his improvement. Our group splits runs 3 in am and 3 in pm after previously doing 6 straight. It's a blessing since my right front was corded after the morning runs.
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Last edited by z3papa; 10-20-2018 at 06:28 PM..
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      10-20-2018, 09:16 PM   #26
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Quote:
Originally Posted by z3papa View Post
Well today Tajoman really stepped up his game after riding with me on my first sketchy run. I was quite proud of his improvement. Our group splits runs 3 in am and 3 in pm after previously doing 6 straight. It's a blessing since my right front was corded after the morning runs.
Thanks for the ride. It helped a lot. (also your rookie walk through was great)
I could not believe what you were doing in the 1st run.

This is my fastest run. 53.5xx sec



I was going to ask you to ride along in my car in run 4 or 5. Maybe next time.
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      10-23-2018, 03:31 PM   #27
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you are running 235/45/17 RE71. I just finished our season on 225/45/17 on 17x7.5 ET 35. Is it worth going to 245/40/17?????????? I am not worried about class legality. Should I get some 17x9 wheels???? what ET is needed to fit them without spacers? I am a newbie. Thx to all.
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      10-23-2018, 08:42 PM   #28
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Originally Posted by buster-riley View Post
you are running 235/45/17 RE71. I just finished our season on 225/45/17 on 17x7.5 ET 35. Is it worth going to 245/40/17?????????? I am not worried about class legality. Should I get some 17x9 wheels???? what ET is needed to fit them without spacers? I am a newbie. Thx to all.
For sure it will be better with 245/40/17. This car is so under tired.
you will be ok with 17x8 ET40~42 for 245/40/17.

I'm even thinking about putting 245/40/17 on 17x7.5 rim.
I still have plenty of tire left for whole next year, so plenty of time to decide.
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      05-06-2019, 01:21 PM   #29
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Went to Auto X with Windycity Miata club.
Always fun.
Surface was still slippery from the top coating last year but I'm getting used to it.

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      05-06-2019, 02:55 PM   #30
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Originally Posted by TajoMan View Post
Went to Auto X with Windycity Miata club.
Always fun.
Thanks for posting - I enjoyed watching that!

Are you still on the 235s - if you are, what size do you think you'll go with once your current set is used up?
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      05-06-2019, 04:31 PM   #31
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Quote:
Originally Posted by dradernh View Post
Thanks for posting - I enjoyed watching that!

Are you still on the 235s - if you are, what size do you think you'll go with once your current set is used up?
I am still with 235/45/17 RE71r.
It's about half way worn after about 90 runs of Auto X (plus about 1000 miles of driving.)

I was thinking about going 245/40/17 of Direzza III but maybe little too crazy idea to put 245 on 7.5" rim.

I'm thinking 235/45/17 Hankook RS4 (widest thread width, better wear) or Direzza III (almost same grip level as RE71r with little wider thread width than RE71r).

Will see how long this tire lasts.
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      05-07-2019, 10:19 AM   #32
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Quote:
Originally Posted by TajoMan View Post
I am still with 235/45/17 RE71r.
It's about half way worn after about 90 runs of Auto X (plus about 1000 miles of driving.)

I was thinking about going 245/40/17 of Direzza III but maybe little too crazy idea to put 245 on 7.5" rim.

I'm thinking 235/45/17 Hankook RS4 (widest thread width, better wear) or Direzza III (almost same grip level as RE71r with little wider thread width than RE71r).

Will see how long this tire lasts.
Yeah, I don't think you want 245s on a 7½"-wide wheel. Although, autocrossers sometimes run combinations that you'd never run on the street.
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      05-07-2019, 12:29 PM   #33
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I am pretty happy with the way the 245/40/17 RE71Rs worked on my 17x8 TR Motorsport wheels in last Sunday's autox. Some understeer, but I could also get the rear to step out at times too. No rubbing. The fronts edges look good after 10 runs and are not rolling excessively. I will be rotating them every event. I kept them at 35psi all around and will experiment a little next time.

I think this it the way to go if you don't already have wheels.
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      05-07-2019, 01:43 PM   #34
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I kinda want to stay in stock FS class.
17x8 seems really good option for overall grip balance.

2 series should have 245s all around from the factory. (especially xdrive model)
225 in front is way too narrow for the weight in front.
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      05-10-2019, 10:44 AM   #35
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Quote:
Originally Posted by dradernh View Post
Yeah, I don't think you want 245s on a 7½"-wide wheel. Although, autocrossers sometimes run combinations that you'd never run on the street.
I was checking the vwvortex forum and a lot of GTI guys run 245/40/17 on their 17x7.5" rim.

Now I am seriously considering to go 245/40/17.
Only thing I kinda worried about was 'IF the tire comes off the rim' but it looks like it's not really a problem.
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      05-12-2019, 09:31 AM   #36
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The autocrossers I used to know swore by going in the reverse direction - fitting the smaller tire to wider rim so the sidewall was stretched taut. They got the kind of pyro readings they wanted that way, and would talk about it as using the whole tire, rather than (outer) half of a slightly larger one (also saves unsprung weight). This was a few decades back, so tire companies may have found a workaround to this for the autoX-specific tires. If your temp readings aren't nice and even across on those overwide setups, it may be worth your time to trial a comparison of s/t like a 225 or 235 on an 8.5 or 9 inch rim.
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      05-12-2019, 06:02 PM   #37
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Not much I can do with rim width to stay in stock FS class.
225/45/17 vs 235/45/17 vs 245/40/17, not sure which will be the best for Auto X.

At least the RE71r has very stiff sidewall. So It may not be that bad to go wider tire.
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      06-09-2019, 03:24 PM   #38
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I think I am getting used to this tire.
Limit is way higher than I imagined and I feel like I always drive little bit too conservatively. (it still destroys the outer edge, lol)

I tried higher pressure this time (36~38 psi in front, 34~35 in rear) and felt better that way. Better turn in and stability.



I met a guy with very fast ES Miata and he had 225 section tire on 6" rim. It looked insane but he was super fast.

I will definitely try 245/40/17 when this set wears out.
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      06-12-2019, 09:49 PM   #39
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Why isn't anyone running an 18" wheel? I thought 18" was the sweet spot, lower profile, less side wall, but not too heavy?
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      06-13-2019, 11:26 AM   #40
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Quote:
Originally Posted by FCBuff View Post
Why isn't anyone running an 18" wheel? I thought 18" was the sweet spot, lower profile, less side wall, but not too heavy?
Only 225 section tires available in 18" for good extreme performance tires.

Not a lot of selection in 245/35/18.
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      06-14-2019, 08:13 AM   #41
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Ahh, Good to know.


Quote:
Originally Posted by TajoMan View Post
Only 225 section tires available in 18" for good extreme performance tires.

Not a lot of selection in 245/35/18.
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      06-14-2019, 10:14 AM   #42
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I recently found out that some of the Civic type R drivers put 285 section tire in front on 8.5" rim (and 245 in the rear) without rubbing.

There is a reason why that car is dominating DS now.
Good chassis, light weight and 300hp with tire that can take all the power.
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      06-23-2019, 12:53 AM   #43
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Today was my first time at a track. (Autobahn CC south)
This was a high speed Auto x called 'Track sprint'. (thanks to TSSCC for organizing this event)
It was pretty scary for me but ton of fun.



Already singed up for the next one. lol
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      06-23-2019, 09:47 PM   #44
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Tajo, brake much later and harder. your wheels should be screeeching around every turn.

looks like tons of fun, more like a Time Attack than an autox.
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