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Just ran the 245-40-17's on an STU Evo against another similar car on Yoks.  Encouraging is the word.  Seemed to be within 2 to 4 tenths, but driver error, car setup, first event of the season,  blah blah ...could account for some of that too.  Drive like Yoks.  Didn't seem quite as grippy overall, but they were full treads against shaved Yoks so we won't really know until we do back to back on our car and get a few more runs on them.  Gonna be a few weeks until we can get that testing done.  Temp data looked prettty similar to Yoks, and they handled +-120 temps with ease.  Over all, pretty pleased so far.

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Patrick Washburn
STU Evo
www.winghats.com

Ran the Direzza's this last weekend and faired well.  3rd out of 33 in Rear Drive Street tire (indexed class in Milwaukee).  Was about 1.2 seconds off the top driver in the class which was Jeff Cashmore.  And this was my first time racing this car and the shocks and tire pressures and sway are not sorted at all. So I'm very pleased with that result. 

 We also measured them width wise against a set of mounted 205/50/15 Falken's on the exact same rim and found the tread width to be a hair under a half inch narrower on the 195/55/15 Direzza's.  I ran them full tread depth with no issues with chunking or so forth... achieved temps in the 110 range for the high side and around 90 for the low side of the car.  2nd place driver in the class was also on Direzza's and Cashmore was on Azenis. 

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R Street index HS.

'98 BMW 318i

www.nsnmotorsports.com

I ran about 44 psi in the rear and about 40 psi in the front at the event.... the pyrometer was yielding linear temperature gradients across the tire which is what I also strive for.... I may have to try to go down some on pressurs to see how things fare compared to what you guys have done...

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R Street index HS.

'98 BMW 318i

www.nsnmotorsports.com

Did you happen to do any overall diameter measurements between the Falkens and the Direzzas?

I don't, but the rev's per mile on tire-racks website will give you a pretty accurate measurement.

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R Street index HS.

'98 BMW 318i

www.nsnmotorsports.com

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Patrick Washburn:

Just ran the 245-40-17's on an STU Evo against another similar car on Yoks.  Encouraging is the word.  Seemed to be within 2 to 4 tenths, but driver error, car setup, first event of the season,  blah blah ...could account for some of that too.  Drive like Yoks.  Didn't seem quite as grippy overall, but they were full treads against shaved Yoks so we won't really know until we do back to back on our car and get a few more runs on them.  Gonna be a few weeks until we can get that testing done.  Temp data looked prettty similar to Yoks, and they handled +-120 temps with ease.  Over all, pretty pleased so far.

          

 

Hey Patrick!  It was great meeting you last week at the KC divisional.  
I ran a full tread depth set of NON-star spec 245/45 Z1's last weekend.  The weather for our run heats (heat 1 on both days) sat and sun was definitely on the chilly side, but after a few runs, my Z1's started to build a little bit of heat.  So far they seem to work with hot pressures in the high 30's up front and mid 30's in the rear.  I suggest starting out with 37f/34r cold.  
FYI, my car is an 05 STi running on 17x9's, big sways front/rear, coilovers with springs 10K front, 8K rear.    

We ran the STS ZX2 for the first time on Sunday in Milwaukee--about .3 behind Larry B's RS 2.5 and about .2 Behind Ryan K's SpecCivic.  One of our front Konis was sent off to Truechoice on Wednesday after the top threads were stripped.  We scrambled to find some replacement struts just to be able to run--found some OE Ford/Tokico SR's to mount our CG coilovers to...the car got off the alignment rack about 5pm Friday--but ran out of time to scale it.  So, out of the box we have a car running with 30-ish place National cars.

...as for the (non-star-spec) Z1s, we were running a staggered setup with the thought of keeping the tail free.  It worked.  Too well, almost...but some more (-) camber and maybe a bit of toe-in will settle things down, I am sure.  215/40-17 in front at 38-40 and 195/55-15 in back at 28-30 seemed to work best.  My fast runs were at 40/28.  They were very forgiving and predictable, which helped a tone in getting 'used' to th car.

Needless to say I am very pleased.  For the money, these tires are fantastic (but that is me talking without any direct experience on anything since RT215s).

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Erik B.
Wisconsin Autocrossers, Inc
www.waiautox.org ___/\___/\___/\___/\___/\___
2007 Mazda6
2000 "Fozda" ZX2 S/R--STS Anti-Civic

I think everybody was impressed and surprised with how well you guys did in that car. Great to see some variety in the class and someone doing something different!! Best of luck and I'm sure I'll see you at events.

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R Street index HS.

'98 BMW 318i

www.nsnmotorsports.com

"I don't, but the rev's per mile on tire-racks website will give you a pretty accurate measurement."

Maybe I'm a dumb ass (which could be...), but I don't see that info on Tirerack's website.  They have that info for the 205/50/16, but none of the other sizes...  I was hoping you had a real world measurement.
 

sure enough!! they don't have all the data up... they have some of the OD's on Dunlop's site, but not all... but yeah, sorry no actual measurement. Eyeballing it I would say that the Direzza's are SLIGHTLY taller than the Azenis.

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R Street index HS.

'98 BMW 318i

www.nsnmotorsports.com

TurfBurn:

I think everybody was impressed and surprised with how well you guys did in that car. Great to see some variety in the class and someone doing something different!! Best of luck and I'm sure I'll see you at events.

 

Thanks, I appreciate hearing that.  Craig, my co-driver (and co-owner) is going into his 2nd full year and this was his first time ever in FWD--he managed a 6th (coned away 5th) and got his first trophy. 

I've been doing this for a long time, but its been 10 years since I've had a truly 'set up' car--I am really looking forward to getting it sorted out.

 

...and yes, i believe the 195/55 Z1 is about .6" taller than the 205/50 RT615.

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Erik B.
Wisconsin Autocrossers, Inc
www.waiautox.org ___/\___/\___/\___/\___/\___
2007 Mazda6
2000 "Fozda" ZX2 S/R--STS Anti-Civic

Okay... spiritual guidance...

Any reason I shouldn't pull the trigger on a set of 225/50R16s shaved to 5/32s tomorrow?  Any insider information?  Don't have to tell me what you know, just a yes or a no.

 

Car is a mildly preppred BMW 318ti. 

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Paul Przyborski

Currently running a 1996 BMW 318ti in STS.
Also now building a CP 1981 Camaro.

http://www.mewhiney.org
http://www.teamziptie.com

Gimp:

Any reason I shouldn't pull the trigger...

 

Pull away... You'll be pleased.

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Erik B.
Wisconsin Autocrossers, Inc
www.waiautox.org ___/\___/\___/\___/\___/\___
2007 Mazda6
2000 "Fozda" ZX2 S/R--STS Anti-Civic

ebnrt:

Gimp:

Any reason I shouldn't pull the trigger...

 

Pull away... You'll be pleased.

 

LOL... a nod from one member and one girlfriend = me spending hard earned monies...

Now for the technical question:

I've never ordered a shaved tire until just 10 minutes ago.  My old street tires required me to scuff them in to remove the mold-release compound.  Is this necessary on a shaved tire, or can I just bolt them on at the race and go with no break in.

Sorry if it's a stupid question. 

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Paul Przyborski

Currently running a 1996 BMW 318ti in STS.
Also now building a CP 1981 Camaro.

http://www.mewhiney.org
http://www.teamziptie.com

Gimp:

I've never ordered a shaved tire until just 10 minutes ago. My old street tires required me to scuff them in to remove the mold-release compound. Is this necessary on a shaved tire, or can I just bolt them on at the race and go with no break in.

You don't have to remove the mold-release (the shaver does that), but most times they aren't shaved perfectly smooth, there's at least a little graining to them. So it takes a few runs to get the tire nice and smooth...so it's pretty similar. 

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Brian Davis, 89 Civic Si, 158 STS

turbohappy:

Gimp:

I've never ordered a shaved tire until just 10 minutes ago. My old street tires required me to scuff them in to remove the mold-release compound. Is this necessary on a shaved tire, or can I just bolt them on at the race and go with no break in.

You don't have to remove the mold-release (the shaver does that), but most times they aren't shaved perfectly smooth, there's at least a little graining to them. So it takes a few runs to get the tire nice and smooth...so it's pretty similar. 

The event where I'm going to be using these first is about 160 miles from my house.  Traditionally, I would just drive on the full treads to the event to remove the mold-release.  Would you say this is too far for the shaved tires and I'm best off just letting the course do the work for me?  It's a two day event, with 10-12 runs over the entire weekend. 

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Paul Przyborski

Currently running a 1996 BMW 318ti in STS.
Also now building a CP 1981 Camaro.

http://www.mewhiney.org
http://www.teamziptie.com

turbohappy:

Gimp:

I've never ordered a shaved tire until just 10 minutes ago. My old street tires required me to scuff them in to remove the mold-release compound. Is this necessary on a shaved tire, or can I just bolt them on at the race and go with no break in.

You don't have to remove the mold-release (the shaver does that), but most times they aren't shaved perfectly smooth, there's at least a little graining to them. So it takes a few runs to get the tire nice and smooth...so it's pretty similar. 

The event where I'm going to be using these first is about 160 miles from my house.  Traditionally, I would just drive on the full treads to the event to remove the mold-release.  Would you say this is too far for the shaved tires and I'm best off just letting the course do the work for me?  It's a two day event, with 10-12 runs over the entire weekend (on a nice and grippy airport surface).

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Paul Przyborski

Currently running a 1996 BMW 318ti in STS.
Also now building a CP 1981 Camaro.

http://www.mewhiney.org
http://www.teamziptie.com

I just got my 254/40/17's yesterday. After some very unscientific measurements the Dunlops are around 1/4" wider than the same size Bridgestones.

 I also measured the circumference and the Dunlops are around 3/8" taller but the Dunlops are full tread 9/32 and the Bridgestones are shaved at 3/32" All things equal they would be the same height shaved.

I'm going to a test N tune tomorrow so I'll let you know what I think. With no real contingencies available, for pro-solo, I don't think it matters what I run...................................whatever is fastest.

 

 

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02 wrx 78 stx

Gimp:

turbohappy:

Gimp:

I've never ordered a shaved tire until just 10 minutes ago. My old street tires required me to scuff them in to remove the mold-release compound. Is this necessary on a shaved tire, or can I just bolt them on at the race and go with no break in.

You don't have to remove the mold-release (the shaver does that), but most times they aren't shaved perfectly smooth, there's at least a little graining to them. So it takes a few runs to get the tire nice and smooth...so it's pretty similar. 

The event where I'm going to be using these first is about 160 miles from my house.  Traditionally, I would just drive on the full treads to the event to remove the mold-release.  Would you say this is too far for the shaved tires and I'm best off just letting the course do the work for me?  It's a two day event, with 10-12 runs over the entire weekend (on a nice and grippy airport surface).

It's not too far to drive for shaved tires, as they are still street tires and you can get thousands of miles of normal driving out of them. Don't know what type of event this is, but I would scrub them in if it's important to be quick on the first run.

Gimp:

The event where I'm going to be using these first is about 160 miles from my house. Traditionally, I would just drive on the full treads to the event to remove the mold-release. Would you say this is too far for the shaved tires and I'm best off just letting the course do the work for me? It's a two day event, with 10-12 runs over the entire weekend (on a nice and grippy airport surface).

Depends on the car. My car doesn't wear tires evenly at all on the street so it isn't too helpful for me. If your tires wear evenly on the street, that would be fine. 

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Brian Davis, 89 Civic Si, 158 STS