2011 6 speed mx5 prht gt wheels and tires

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2011 6 speed mx5 prht gt wheels and tires

Postby StephenW571 » Fri Nov 15, 2013 10:53 am

Hi Brian
I am a new member with a 6 speed 2011 version of your 2012 prht gt
Just put on your roadstersport q muffler and am very please with it and now got the bug for more upgrades.
I think I will closely follow all your upgrades on yr prht ss project except for wheels.
In this regard I would prefer a little more aggressive stance/wider tire
I like the rfp1 style and in 17 x 8 but this comes with 45mm offset.
What are my tire size options on this wheel without fender mods and aggressive camber change?
Help, I,m going crazy trying to figure it out
Many thanks. Great site
StephenW571
 
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby Brian » Fri Nov 15, 2013 11:40 am

You can use that 17x8 RPF1 with 225/45/17 or less tire and it will clear factory fenders with that 45mm offset.

The next size up is 235/40/17 and it needs a little fender roll with that offset.
Brian Goodwin
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby JamesK383 » Fri Nov 15, 2013 1:28 pm

is 235 the correct fitment?

Would 225 be a stretch?
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby Brian » Fri Nov 15, 2013 4:56 pm

I prefer the diameter of the 235/40/17 (perfect match for stock diameter), but the slightly tall 225/45/17 works fine for many customers.
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby Va MX5 » Sat Nov 16, 2013 6:20 am

Hi Stephen,

I have the same car, but a 2012 model. Brian set me up with 235/40/17's on 48mm offset rims earlier this year and I could not be happier with the choice. There are Progress sways & springs on the car also, fender clearance is perfect and NO roll was required. My alignment specs are in the SS thread, tire wear is a non issue even after 20+ track day events since the install and 10,000+ road miles. For next season, the only changes will be a fully adjustable coilover set, bump the rear out to -1.7 and R888's for rubber. Great little car and it looks pretty good too!

Regards, Pat
Last edited by Va MX5 on Tue Nov 19, 2013 4:38 pm, edited 1 time in total.
Pat- Va MX5
2012 MX5 PRHT GT
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby StephenW571 » Sun Nov 17, 2013 11:29 am

Hi to Brian and all that responded to my virgin post.
Thanks everyone This a great help.
My future upgrade plan is as follows,
Next the street header, then progress sways and coil springs
By that time my tires will need renewing so then the wheels
StephenW571
 
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby StephenW571 » Sat Nov 30, 2013 7:40 am

Hi Pat
Thks yr input
What wheels did you use with 48mm offset?
I like the idea of the 235/40/17's the best but these need to be on an 8" wide or wider wheel I think
Another question. When changing to the progress sways did you also have to change the end links?
Happy thanksgiving
Steve
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby Va MX5 » Sun Dec 01, 2013 8:32 am

Hi Steve,

The wheels I am running are PF01 @ 17 X 9, per Brian's recommendation. The tire & wheel combination provides excellent feedback to the driver and offers a lot of options for choosing R compound setups if you like.

As for the End links, there are many quality choices available including the RB units, but I strongly recomend you purchase units that are adjustable on the vehicle, this is the right way to do it, especially since the sways are adjustable. The RD end links are not, so I would spend the extra money to do it right with something else. My plan is to upgrade to fully adjustable coil-overs in the near future, and at that time new end links will be added that can be adjusted while on the car, to replace the RB units I am currently using. But I can't answer your question about the stock end links being compatible with the Progress sways, because I never tried it.

Let me know if you have any other questions.

Regards, Pat
Last edited by Va MX5 on Mon Dec 02, 2013 5:03 am, edited 1 time in total.
Pat- Va MX5
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby StephenW571 » Sun Dec 01, 2013 1:37 pm

Hi Pat
Thks for yr advice it's most appreciated
I had not considered 9" wide wheels. I'm thinking this May be a bit too much tire for my intended use as I don't track
Having said that I'm leaning towards the PF01 in the 8" et50 with 235/40/17 tires.

Your advice on the end links is great. I hadn't even considered the possibility for adjustment of these on the vehicle at all. I can understand this would be a serious pain in the proverbial if many adjustments were needed. In my case though I think once I'm set that would be it. What do you think?

Perhaps if you are upgrading to coilovers I would be interested in your progress springs and RB end links.

Thks again Pat
Best rgds
Steve
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby Va MX5 » Sun Dec 01, 2013 4:40 pm

Steve,

The 9 inch rims maximize the contact patch and seem to minimize sidewall flex, but this was the result of Brian's recommendation, not any personal experience working with 8's vs. 9's. I think for a steet only application, the 8 inch rims will present a nicer / fuller looking appearance to the side wall of the tire that most folks may find more appealing. However the 8 inch set up will still provide excellent aggressive street performance.

The end links, I still would do the on-the-car adjustable units, the cost savings is not sufficient to me to warrant going with the RB units, if I was going to do this all over again. As you get more into this stuff, you may find your objectives / goals with the car change, as such you will not have to change the links to adapt. Remember every time you change something on the cars running gear, this may have an unanticipated affect on handling you may want to adjust for, why limit yourself. As I move forward with my own goals, I will let you know if these items are available.

Good luck with your future driving experiences, but be aware this stuff is addictive!

Regards, Pat
Pat- Va MX5
2012 MX5 PRHT GT
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby StephenW571 » Sun Dec 01, 2013 6:30 pm

Hi Pat
Good advise all round. Many thanks.
Your sure right about this stuff being addictive.
For me this all started with changing out the wimpy roadrunner horn for a two tone euro style a week after I got the car. I thought that would be it. Then I discovered Goodwin Racing and the great bunch of people posting on this site.
Thanks again
Best rgds
Steve
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Re: 2011 6 speed mx5 prht gt upgrades to date

Postby StephenW571 » Thu Jan 30, 2014 11:05 am

Hi everyone,
I have just completed a bunch more upgrades last weekend, the car now has;
Roaster sport Q muffler
Roadster street bright ceramic header
Progress front and rear sways with RB end links, set on middle hole front and hole nearest end on rear
Progress springs
Smart top
IL motorsports x brace

I would like to thank all those who posted the install instructions/photos etc which helped me a great deal.
I still need to get an alignment done but will wait a couple hundred miles first.
FYI
I have a free app on my I-pad "chinometer" just to get an idea of the camber increase gained by the springs. Not accurate I know, but a reasonable indication. Increase was abt 0.7 degrees more negative. Fronts now around -1.4 and rears around -1.9. Lowered fronts to 13.5 inches and rears to 14 inches after torque setting the needed fixtures with full weight of car on the ground and after driving it around the block first as recommended.
So far I'm real pleased with the outcome.
Thanks everyone
Steve
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby Freescopesdad » Fri Jan 31, 2014 8:59 am

Stephen, have you had the car tuned since you installed the header? If not, how does the car drive compared to the stock header? Thanks.
Ron Petrich
http://www.sacramentoareamiata.org
2016 ND GT 6MT|ZII|MeisterR|Progress|OFT|HDDDM4
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Re: 2011 6 speed mx5 prht gt wheels and tires

Postby StephenW571 » Mon Feb 03, 2014 2:45 pm

Hello Ron,
I have not had the engine tuned/reflashed at all and I don't plan to.
This is purely a street machine and according to some other threads the stock ecu will learn and adjust itself to some extent.
The car drives great, no problems what-so-ever and the difference in torque can be easily felt through your seat.
The header makes a much better sound too especially when you bury your right foot in the carpet.
At steady highway speeds with the top up the exhaust noise is noticeable but not annoying in any way.

Hope this helps
StephenW571
 
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Joined: Sun Nov 03, 2013 4:11 pm

Re: 2011 6 speed mx5 prht gt wheels and tires

Postby Freescopesdad » Tue Feb 04, 2014 3:44 pm

Yes it does. Brian, would you chime in here? What exactly does the ecu "learn" in this case? Thanks.
Ron Petrich
http://www.sacramentoareamiata.org
2016 ND GT 6MT|ZII|MeisterR|Progress|OFT|HDDDM4
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