Coilover spring diameter vs OEM - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ahaghshenas · 11-25-2013, 12:16 AM

Got myself new wheels and tires (18x8.5 48offset - 245/35/r18) and my calculations were all wrong, the front wheels rest against the front spring.

How much space will I regain if I was to install coilovers?

hanabie · 11-25-2013, 12:49 AM

plenty! whats ur offset?

ahaghshenas · 11-25-2013, 03:50 AM

Quote:

Originally Posted by hanabie

plenty! whats ur offset?

The offset is 48

Captain Snooze · 11-25-2013, 06:56 AM

Quote:

Originally Posted by hanabie

plenty! whats ur offset?

Why would fitting coilovers alter the wheel clearance?

86•BRZ · 11-25-2013, 08:01 AM

Quote:

Originally Posted by Captain Snooze

Why would fitting coilovers alter the wheel clearance?

because the wheels sit directly next to them... and they touch if the wheels are too big or if there is too much positive offset.

ahaghshenas · 11-25-2013, 08:36 AM

I measured the diameter of the OEM front spring it was about 12cm. The diameter of aftermarket coilover springs are significantly smaller, which should give more clearance.

With stock wheels the gap from the OEM spring is just under 20mm. The wheel setup I choose has moved the tire innerwall around 15mm closer and it touches.

I know I could use spacers and it will be sorted, but there not that cheap and I plan to get coilovers eventually. If the coilovers will sort out the issue I will order them now, but dont want to buy them to find out I still need spacers??

Any input welcome

neurokinetik · 11-25-2013, 09:45 AM

On the KWs, I gained at least 10, if not 20mm of clearance over the stock pieces. With 17x9 wheels, 42 offset, and 245/40 Hankook RS3s, I only had only about enough room to fit a credit card between the spring perch and the tire. Obviously, adding any camber at all would put the tire up against the perch. Due to the width and offset difference of our wheels, you should in theory have about 6mm more clearance than I did with the stock springs and struts.

BlueDubbinTDI · 11-25-2013, 10:53 AM

Get wheel spacers

hanabie · 11-25-2013, 11:12 AM

Quote:

Originally Posted by BlueDubbinTDI

Get wheel spacers

What he said. Try 10mm.

Sent from my SGH-T999 using Tapatalk

mav1178 · 11-25-2013, 12:32 PM

Quote:

Originally Posted by ahaghshenas

How much space will I regain if I was to install coilovers?

Quote:

Originally Posted by Captain Snooze

Why would fitting coilovers alter the wheel clearance?

Roughly this much:

-alex

djdnz · 11-25-2013, 01:26 PM

It's a pretty huge difference. With my wheels I had about 1-3mm clearance with stock suspension. With my RCE T0's (mostly the same as KW V1) I can fit my hand sideways between the wheel and the coils now.

11-25-2013, 12:16 AM	#1
ahaghshenas Member Join Date: Jul 2012 Drives: Subaru BRZ Location: UAE Posts: 92 Thanks: 5 Thanked 13 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Coilover spring diameter vs OEM Got myself new wheels and tires (18x8.5 48offset - 245/35/r18) and my calculations were all wrong, the front wheels rest against the front spring. How much space will I regain if I was to install coilovers? Last edited by ahaghshenas; 11-25-2013 at 08:36 AM.

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11-25-2013, 12:49 AM	#2
hanabie Senior Member Join Date: Feb 2012 Drives: WRB LMTD '13 Location: Phillips Ranch Posts: 1,246 Thanks: 184 Thanked 242 Times in 158 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	plenty! whats ur offset?

11-25-2013, 08:36 AM	#6
ahaghshenas Member Join Date: Jul 2012 Drives: Subaru BRZ Location: UAE Posts: 92 Thanks: 5 Thanked 13 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I measured the diameter of the OEM front spring it was about 12cm. The diameter of aftermarket coilover springs are significantly smaller, which should give more clearance. With stock wheels the gap from the OEM spring is just under 20mm. The wheel setup I choose has moved the tire innerwall around 15mm closer and it touches. I know I could use spacers and it will be sorted, but there not that cheap and I plan to get coilovers eventually. If the coilovers will sort out the issue I will order them now, but dont want to buy them to find out I still need spacers?? Any input welcome

11-25-2013, 09:45 AM	#7
neurokinetik Senior Member Join Date: Aug 2012 Drives: 2013 Scion FR-S Firestorm Location: Buffalo, NY Posts: 199 Thanks: 75 Thanked 70 Times in 43 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	On the KWs, I gained at least 10, if not 20mm of clearance over the stock pieces. With 17x9 wheels, 42 offset, and 245/40 Hankook RS3s, I only had only about enough room to fit a credit card between the spring perch and the tire. Obviously, adding any camber at all would put the tire up against the perch. Due to the width and offset difference of our wheels, you should in theory have about 6mm more clearance than I did with the stock springs and struts.

11-25-2013, 10:53 AM	#8
BlueDubbinTDI Senior Member Join Date: Mar 2013 Drives: 2013 FR-S, 2012 MCS Location: Jax, FL Posts: 1,975 Thanks: 943 Thanked 570 Times in 356 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Get wheel spacers

11-25-2013, 01:26 PM	#11
djdnz 1337 Join Date: Oct 2011 Drives: 2013 BRZ WRB S/C Location: San Jose, CA / Waterloo, ON Posts: 1,134 Thanks: 776 Thanked 482 Times in 269 Posts Mentioned: 7 Post(s) Tagged: 2 Thread(s)	It's a pretty huge difference. With my wheels I had about 1-3mm clearance with stock suspension. With my RCE T0's (mostly the same as KW V1) I can fit my hand sideways between the wheel and the coils now.

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