Auto Fitment Calculator - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

itdansharpe · 01-09-2013, 08:30 AM

Quote:

Originally Posted by jeebus

Yay I win at math today. :P

I have corrected for this calculation.

JDMenrique · 01-19-2013, 09:49 AM

this should seriously be stickied

etherealfall · 01-19-2013, 10:08 AM

This is awesome.

raul · 01-19-2013, 12:45 PM

Quote:

Originally Posted by Foobar

So this tool assumes that the wheel width is equal to the tire width?

Yes, otherwise he would have to model shapes for tire stretch, which I'm sure is a lot more work.

Tansey86 · 01-19-2013, 02:41 PM

How accurate is this?

Also can you put in how close it would be to the shock/struts on the inside?

Pure Automotive · 01-19-2013, 02:51 PM

Nice, I wish my math skills were that useful, you should go to MIT....

itdansharpe · 01-21-2013, 05:27 PM

Thanks guys. The script assumes an 'appropriate' wheel width, because drawing tire stretch is tricky to do. If there was enough demand, I'd take that challenge on.

As for inside clearance, if someone wants to provide some kind of diagram, or something to work with, I'd be happy to add it in.

coyote · 01-21-2013, 10:07 PM

Quote:

Originally Posted by itdansharpe

I'd be happy to try and calculate camber, but would need a good technical source on how to calculate it.

Mate I'm not a technical source, but if you know the camber you are targeting it's pretty simple to work out the resultant change of position of the tyre.

x = sin(c) * (D - SH) / 2

Where:

x is change in tyre position
c is camber in degrees
D is diameter of tyre
SH is sidewall height

You could leave the sidewall height out, but it just approximates halfway up the sidewall as the widest point of the tyre.

Sportsguy83 · 01-29-2013, 04:26 AM

bumpity..

BlaineWasHere · 01-29-2013, 12:04 PM

IMO it's incomplete without wheel width. These numbers arn't the same for a 8" wheel than a 9.5" wheel.

itdansharpe · 01-29-2013, 08:02 PM

Hi all! I had some time to redesign and add in some key features people have been asking for:

- Camber
- Wheel Width

Enjoy! Maybe this will earn me a sticky now? ha!

Tansey86 · 01-29-2013, 08:12 PM

I'd still love a way to see how close the wheel would be to hitting the shock/struts or a coilover for those of us who want to run a wide tire out back.

coyote · 01-30-2013, 11:41 PM

Quote:

Originally Posted by itdansharpe

Maybe this will earn me a sticky now? ha!

Where do I vote?

Agree that the next step should be inboard clearance, both the stock struts and guard liner (for those with coilovers).

itdansharpe · 01-31-2013, 07:48 PM

Bump! Added a few design touches, for fun. I was in the process of adding inside clearance, and quickly realized there are several suspension / driveline components that will need to be added in to accomplish this. I'm still not sure if it will be possible. For now, I've added a hub, and rotor, with the ability to toggle a particular components visibility. It also reassures me that as complex as some calculations are, the numbers are adding up correctly. (For example, offset is bang on)

Cheers.

01-21-2013, 05:27 PM	#35
itdansharpe Senior Member Join Date: Aug 2012 Drives: 2013 Scion FR-S Location: Barrie, ON Posts: 284 Thanks: 93 Thanked 271 Times in 54 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Thanks guys. The script assumes an 'appropriate' wheel width, because drawing tire stretch is tricky to do. If there was enough demand, I'd take that challenge on. As for inside clearance, if someone wants to provide some kind of diagram, or something to work with, I'd be happy to add it in. __________________ New: 2014 6MT Asphalt Rota Titan 17x9, RS-3 V2, Skunk2 Pro-C, Eibach Sway Bars, Password:JDM Strut Tower Bar, Perrin MCB, StopTech Stainless Lines, Hawk HP+, Nameless 3" Exhaust, VG Sharkfin, FIVE:AD Spoiler, DDM Tuning HID's 5k, HID Old: 2013 6AT Boosted Firestorm..

01-29-2013, 12:04 PM	#38
BlaineWasHere Grip>Drift Join Date: Jun 2012 Drives: FRS Location: NorCal Posts: 3,472 Thanks: 782 Thanked 1,749 Times in 918 Posts Mentioned: 53 Post(s) Tagged: 2 Thread(s)	IMO it's incomplete without wheel width. These numbers arn't the same for a 8" wheel than a 9.5" wheel. __________________ My FR-S Build Thread!

01-29-2013, 08:02 PM	#39
itdansharpe Senior Member Join Date: Aug 2012 Drives: 2013 Scion FR-S Location: Barrie, ON Posts: 284 Thanks: 93 Thanked 271 Times in 54 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Hi all! I had some time to redesign and add in some key features people have been asking for: - Camber - Wheel Width Enjoy! Maybe this will earn me a sticky now? ha! __________________ New: 2014 6MT Asphalt Rota Titan 17x9, RS-3 V2, Skunk2 Pro-C, Eibach Sway Bars, Password:JDM Strut Tower Bar, Perrin MCB, StopTech Stainless Lines, Hawk HP+, Nameless 3" Exhaust, VG Sharkfin, FIVE:AD Spoiler, DDM Tuning HID's 5k, HID Old: 2013 6AT Boosted Firestorm..

01-31-2013, 07:48 PM	#42
itdansharpe Senior Member Join Date: Aug 2012 Drives: 2013 Scion FR-S Location: Barrie, ON Posts: 284 Thanks: 93 Thanked 271 Times in 54 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Bump! Added a few design touches, for fun. I was in the process of adding inside clearance, and quickly realized there are several suspension / driveline components that will need to be added in to accomplish this. I'm still not sure if it will be possible. For now, I've added a hub, and rotor, with the ability to toggle a particular components visibility. It also reassures me that as complex as some calculations are, the numbers are adding up correctly. (For example, offset is bang on) Cheers. __________________ New: 2014 6MT Asphalt Rota Titan 17x9, RS-3 V2, Skunk2 Pro-C, Eibach Sway Bars, Password:JDM Strut Tower Bar, Perrin MCB, StopTech Stainless Lines, Hawk HP+, Nameless 3" Exhaust, VG Sharkfin, FIVE:AD Spoiler, DDM Tuning HID's 5k, HID Old: 2013 6AT Boosted Firestorm..

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01-19-2013, 10:08 AM	#31
etherealfall Member Join Date: Dec 2012 Drives: Toyota 86 GTS Storm Black Location: Australia Posts: 60 Thanks: 2 Thanked 5 Times in 5 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	This is awesome.

01-19-2013, 02:41 PM	#33
Tansey86 Senior Member Join Date: Sep 2012 Drives: 2003 Subaru Outback Location: Long Island, NY Posts: 1,318 Thanks: 154 Thanked 528 Times in 300 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	How accurate is this? Also can you put in how close it would be to the shock/struts on the inside?

01-19-2013, 02:51 PM	#34
Pure Automotive Join Date: Nov 2012 Drives: 2013 FRS Whiteout Location: Millersville, MD Posts: 2,035 Thanks: 735 Thanked 1,952 Times in 650 Posts Mentioned: 147 Post(s) Tagged: 0 Thread(s)	Nice, I wish my math skills were that useful, you should go to MIT....

01-29-2013, 08:12 PM	#40
Tansey86 Senior Member Join Date: Sep 2012 Drives: 2003 Subaru Outback Location: Long Island, NY Posts: 1,318 Thanks: 154 Thanked 528 Times in 300 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I'd still love a way to see how close the wheel would be to hitting the shock/struts or a coilover for those of us who want to run a wide tire out back.

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