Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 09-18-2010, 01:01 PM   #1
Registered User
 
Join Date: Aug 2009
Location: London, UK
Posts: 155
10J x 18 ET58 - someone with experience please

Hi all

After spending hours with various offset calculators I'm almost there, but would really like someone's advice, who's done it:

I've just bought a set of Carrera III alloys:
Fronts: 8J x 18 ET 57
Rears: 10J x18 ET58

My current Turbo twists are:

Fronts: 7.5J x 18 ET50
Rears: 9J x 18 ET52

The car is a 2001 Boxster 986 3.2S

What I'm trying to work out is the size of Spacer required at the back - I currently have a 22mm and whilst it easily clears the strut, the tyre does stick out of the arch slightly.

The research I've done suggests a 15mm or an 18 mm spacer will be perfect, but not having the luxury to try before I buy I don't want to make a mistake and I'm finding mixed results re. rubbing - whilst the 18 will definitely work, will the 15 tuck in slightly without rubbing on the strut? I'm getting confused!

Cheers

Gary H is offline   Reply With Quote
Old 09-18-2010, 07:10 PM   #2
Registered User
 
TriGem2k's Avatar
 
Join Date: Sep 2005
Location: Los Angeles, CA
Posts: 1,431
Send a message via AIM to TriGem2k
Gary,

You need 25mm spacers to fit the rears comfortably. You can get away with 20mm but it will be tight. I run 18x10 et 48mm with 5mm spacers for comfortable fit.

The front will fit but for cosmetics sake I would put 5-10mm spacers on. I run 18x8.5 et55 and have no spacers with no issues.

James D
__________________
http://i46.tinypic.com/2qx0rqs.jpg
2001 Boxster Artic Silver / Black Interior
-GT3 Front Bumper w/ Lip
-Side Skirts
-Gemballa Exhuast and Cats
-O.Z. Racing 18" Wheels
--18X8.5Front 18X10 Rears
-Michilen PS Tires 225/40/18 & 285/30/18
-5mm Rear Spacers
-Porsche Door Sills
-H&R Springs
-Powerflow Intake
-B&M Short Shifter
-Pioneer Avic-F90BT Navigation
-Focal Polyglass 165VR3
-Alpine PDX 5 Amp
-Bose OEM Subwoofer & Midrange
-Audio Controld DQXS (DSP)
TriGem2k is offline   Reply With Quote
Old 09-18-2010, 09:24 PM   #3
Registered User
 
Johnny Danger's Avatar
 
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
Garage
Quote:
Originally Posted by Gary H
Hi all

After spending hours with various offset calculators I'm almost there, but would really like someone's advice, who's done it:

I've just bought a set of Carrera III alloys:
Fronts: 8J x 18 ET 57
Rears: 10J x18 ET58

My current Turbo twists are:

Fronts: 7.5J x 18 ET50
Rears: 9J x 18 ET52

The car is a 2001 Boxster 986 3.2S

What I'm trying to work out is the size of Spacer required at the back - I currently have a 22mm and whilst it easily clears the strut, the tyre does stick out of the arch slightly.

The research I've done suggests a 15mm or an 18 mm spacer will be perfect, but not having the luxury to try before I buy I don't want to make a mistake and I'm finding mixed results re. rubbing - whilst the 18 will definitely work, will the 15 tuck in slightly without rubbing on the strut? I'm getting confused!

Cheers
According to my rough calculations, the change in fitment on the rear wheels will decrease inner clearance by approximately 19 mm and will cause the wheel to extend outward an additional 7 mm. The problem with this wheel set is not so much the size (i.e. width), but rather the very high offset. To give you an example, depending upon one's suspension set-up, most of 986 boxster wheel applications that I have been involved with, have utilized the following fitment: fronts: widths of 8 to 8.5 inches with offsets ranging from +47 and lower Rears: 9.5 to 10 inches with offsets ranging from +45 and lower. Try using a 20 mm spacer on the rears, that should give you adequate inner clearance, without extending too far outward. I would also recommend using spacers up front to lower the effective offset as well. You will especially need to do this if you ever decide to install adjustable coilovers.
__________________
Don't worry I've got the microfilm.

Last edited by Johnny Danger; 09-18-2010 at 09:34 PM.
Johnny Danger is offline   Reply With Quote
Old 09-18-2010, 09:48 PM   #4
Registered User
 
ChrisZang's Avatar
 
Join Date: Mar 2006
Location: San Carlos, CA 94070
Posts: 1,450
you will also need to get the e-brake cables out of the way by zip-tying them to the lower control arms. Otherwise they'll be touching the inside of the tires.
After you've done that you'll need to re-adjust the e-brake
__________________
I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car
ChrisZang is offline   Reply With Quote
Old 09-19-2010, 03:57 AM   #5
Registered User
 
Join Date: Aug 2009
Location: London, UK
Posts: 155
Excellent - thank you all.
I'm now beginning to think that I should just sell them and search for a closer offset
Gary H is offline   Reply With Quote
Old 12-14-2010, 08:33 AM   #6
Registered User
 
Join Date: Aug 2009
Location: London, UK
Posts: 155
Just an update - After some trial and error, I'm now running a 15mm at the rear and a 21mm at the front with these wheels. Fills the arches perfectly, nothing sticking out and no fouling or rubbing.
Gary H is offline   Reply With Quote
Old 12-14-2010, 09:07 AM   #7
Registered User
 
Johnny Danger's Avatar
 
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
Garage
Quote:
Originally Posted by Gary H
Just an update - After some trial and error, I'm now running a 15mm at the rear and a 21mm at the front with these wheels. Fills the arches perfectly, nothing sticking out and no fouling or rubbing.

Let's see some photos .
__________________
Don't worry I've got the microfilm.
Johnny Danger is offline   Reply With Quote
Old 12-17-2010, 11:11 AM   #8
Registered User
 
Join Date: Aug 2009
Location: London, UK
Posts: 155
These are my Track wheels - a set of 987 17's, running 225's up front and 245's at the back.



So that's with a 15mm spacer at the back and a 21 up front

Will get a picture of the Carrera III's soon with the new spacers soon. However, with a 21mm on the back and 25 up front:



Last edited by Gary H; 12-17-2010 at 11:13 AM.
Gary H is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 09:18 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page