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      09-10-2019, 05:49 PM   #133
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Here's some track video on the PSS and stock wheels (with pressures as delivered and driven to the track). I was taking it a bit easier on this shorter layout so the understeer, while there, isn't as visible. I ran the longer track (still short) this weekend and pushed harder and the understeer was egregious. I'm pretty sure under the current rules (essentially SCCA autocross classing rules) the M2C isn't going to be competitive in time trials with a well-driven C6 Z06 but it's still fun. Better pads and higher temp fluid will help as well, but nothing (legal for class) is going to close that 100HP gap.

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      09-10-2019, 06:57 PM   #134
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Got my new shoes installed to day along with Ground Control camber plates. Still have to get an alignment done.

Thanks to Tyler at Hardy Vehicle Designs in Tempe, AZ for helping get the camber plates installed.

Apex EC-7 in silver with Toyo R888R (265 & 295 R19) on 2020 M2 Competition.







Speaking of alignment, can I get some specs on toe?
Already planning on camber settings of Front: -2.8 degrees / Rear: -1.8 degrees
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      09-10-2019, 07:20 PM   #135
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Quote:
Originally Posted by K-Fab View Post
Got my new shoes installed to day along with Ground Control camber plates. Still have to get an alignment done.

Thanks to Tyler at Hardy Vehicle Designs in Tempe, AZ for helping get the camber plates installed.

Apex EC-7 in silver with Toyo R888R (265 & 295 R19) on 2020 M2 Competition.







Speaking of alignment, can I get some specs on toe?
Already planning on camber settings of Front: -2.8 degrees / Rear: -1.8 degrees
0.08 total front toe is about the best you can do if you want to be able to run it on the street. I have -2.5 0.08 & -2.0 .30 rear
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      09-10-2019, 07:25 PM   #136
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Quote:
Originally Posted by Expert@ApexRaceParts View Post
We've heard this as well, but haven't yet taken any specific measurements. With that said, the 275/30-19 still has a chance of rubbing especially if the car is lowered.

In the photos wacobipe posted, you can see how tight the clearance is with 265/30. The 275/30 will have 3mm less clearance to the fender liners. This type of rubbing isn't necessarily a big issue, and it usually self-clears over time. It's just something you'll want to be aware of and check on periodically.

--Dylan
Cool, thanks! I may need to try and be the guinea pig.
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      09-10-2019, 08:50 PM   #137
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Quote:
Originally Posted by Phantom_9192 View Post
Here's some track video on the PSS and stock wheels (with pressures as delivered and driven to the track). I was taking it a bit easier on this shorter layout so the understeer, while there, isn't as visible. I ran the longer track (still short) this weekend and pushed harder and the understeer was egregious. I'm pretty sure under the current rules (essentially SCCA autocross classing rules) the M2C isn't going to be competitive in time trials with a well-driven C6 Z06 but it's still fun. Better pads and higher temp fluid will help as well, but nothing (legal for class) is going to close that 100HP gap.
PSS are HORRIBLE track tires. they get very greasy easily once they get hot. that could be your main reason for understeer. the OP has listings of tire sizes that will fit. i went with 255/35/19 and 275/35/19 RE-71R.
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      09-10-2019, 09:21 PM   #138
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oh, btw, here is a before and after.

RE-71R
255/35/19
275/35/19

BEFORE


AFTER
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      09-11-2019, 05:41 AM   #139
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Quote:
Originally Posted by 2PUTT View Post
oh, btw, here is a before and after.

RE-71R
255/35/19
275/35/19

BEFORE


AFTER
Looks good
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      09-11-2019, 09:39 AM   #140
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Looks sharp, 2PUTT!
You clearly have some drop in the car. Did you add any camber?
I'm not planning to do either of those things.
Thanks!
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      09-11-2019, 09:44 AM   #141
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If I went 265 front, 275 rear, would the fronts rub? Anyone tried this yet?

<edit> I'm just now seeing all the updates to Apex's first post... looks like I'll go 255/275 RE71R. Thanks all!
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Last edited by Phantom_9192; 09-11-2019 at 10:09 AM..
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      09-11-2019, 09:54 AM   #142
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Quote:
Originally Posted by 2PUTT View Post
oh, btw, here is a before and after.

RE-71R
255/35/19
275/35/19

BEFORE


AFTER
Looks nice - thanks for sharing. It's interesting how the "flanges" on the outside perimeter of the Apex wheels make them look smaller than the OEM wheels.
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      09-11-2019, 12:41 PM   #143
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Quote:
Originally Posted by K-Fab View Post
Got my new shoes installed to day along with Ground Control camber plates. Still have to get an alignment done.

Thanks to Tyler at Hardy Vehicle Designs in Tempe, AZ for helping get the camber plates installed.

Apex EC-7 in silver with Toyo R888R (265 & 295 R19) on 2020 M2 Competition.







Speaking of alignment, can I get some specs on toe?
Already planning on camber settings of Front: -2.8 degrees / Rear: -1.8 degrees
Looks great. I'm digging the look without the center caps. Looks more purposeful/serious.
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      09-11-2019, 01:41 PM   #144
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Quote:
Originally Posted by PilotxERAU View Post
0.08 total front toe is about the best you can do if you want to be able to run it on the street. I have -2.5 0.08 & -2.0 .30 rear
Toe in, toe out? .080" - so just a hair over 1/16th.

Quote:
Originally Posted by paradocs98 View Post
Looks great. I'm digging the look without the center caps. Looks more purposeful/serious.
Thanks! I usually don't mess with center caps on track wheels - just something to loose.
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      09-11-2019, 03:38 PM   #145
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Quote:
Originally Posted by Phantom_9192 View Post
If I went 265 front, 275 rear, would the fronts rub? Anyone tried this yet?

<edit> I'm just now seeing all the updates to Apex's first post... looks like I'll go 255/275 RE71R. Thanks all!
Thanks for the posts! You'll want to be sure to note the sidewall height in your posts to clarify, since this can make or break a fitment in terms of rubbing up front.

Front tire sizes known to clear without rubbing on our 19x9.5" ET28:
245/35-19
255/35-19
265/30-19

As mentioned, switching to a more track-oriented tire will make a drastic improvement for you in terms of reducing understeer, although camber plates are ultimately the correct way to go about solving this. They'll pay for themselves in terms of reduced tire wear after only a handful of events, and are essentially required for anyone doing more than 3-5 track events/HPDEs per year.

--Dylan
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      09-11-2019, 06:10 PM   #146
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Quote:
Originally Posted by Phantom_9192 View Post
Looks sharp, 2PUTT!
You clearly have some drop in the car. Did you add any camber?
I'm not planning to do either of those things.
Thanks!
Thank you!!

Yes. Car is lowered on M Performance coilovers. I am scheduled for an alignment on Friday. No camber added (yet). My 135is had some slight camber (-2) just to help with the track sessions.
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      09-11-2019, 08:39 PM   #147
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Quote:
Originally Posted by K-Fab View Post
Toe in, toe out? .080" - so just a hair over 1/16th.


Thanks! I usually don't mess with center caps on track wheels - just something to loose.
Toe in. It gets loosy goosy (tramline all over the place) if you do any toe out on the street (I tried it and actually had my stability control light blinking trying to go straight ). Even zero toe I hear is pretty unstable on street.
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      09-12-2019, 06:41 AM   #148
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Quote:
Originally Posted by Carbon_73 View Post
Hi.
Looks cool.
Tires michelin pilot sport 4s?
thx
Yes they are.
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      09-12-2019, 06:43 AM   #149
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Quote:
Originally Posted by PilotxERAU View Post
Looking at the 275/295. You think 275/30 will fit up front? I am lowered but have -2.5 front camber.
Im not sure...its a damn tight fit with 265 all around. Camber would help but not sure its enough.
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      09-12-2019, 07:57 AM   #150
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Quote:
Originally Posted by wacobipe View Post
Im not sure...its a damn tight fit with 265 all around. Camber would help but not sure its enough.
Thanks. Dinan did it on their M2C with Forglines so I guess it can be done.
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      09-12-2019, 08:00 AM   #151
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Quote:
Originally Posted by PilotxERAU View Post
Thanks. Dinan did it on their M2C with Forglines so I guess it can be done.
Dinan changed from 265/35 up front to a 275/30-19. Out back went to 295/30-19. They had rubbing issues trying to fit the larger diameter 265/35 up front.
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      09-12-2019, 10:11 AM   #152
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Quote:
Originally Posted by CSBM5 View Post
Dinan changed from 265/35 up front to a 275/30-19. Out back went to 295/30-19. They had rubbing issues trying to fit the larger diameter 265/35 up front.
Right. So I am trying to answer the question will 275/30 fit up front on EC-7s. Surprised no one has tried this yet???
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      09-13-2019, 12:07 PM   #153
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I'm still waiting on mine. I joined the group buy late. I do have some concerns now though. Currently I'm running M Performance coilovers, camber plates (-2.5f, -2.0r), and only moderately dropped. I'm also running a 255 up front and 285 in back RE-71 setup.

Here's my concern, the rear (where more contact patch really affects getting power down coming out of corners) needs to be a size smaller at 275 per Apex. I realize the fronts increase, but I feel like my turn-in is great and it already provides adequate traction as-is.

I know that the Toyo option can be larger, but don't most of you feel that the difference in performance from the actual tire becomes a wash between the RE-71 and R888R? Plus a user mentioned before that he was experiencing issues with his MP coilovers?
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      09-13-2019, 03:27 PM   #154
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Pretty much Re71 is your only real 200tw cost effective option at the moment. That said, only the 305 has a 30 profile tire - everything else of use is 35 sidewall.


RE71:
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