Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > 911 / 930 Turbo & Super Charging Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Nov 2000
Location: cincinnati,oh
Posts: 66
18 inch Wheel Fitment to 79 930

Will 9x18 and 11x18 with backspacing of 6 and 7 fit on a stock 1979 930??
Thanks
Old 02-12-2008, 08:53 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
Rory Mckenna's Avatar
 
Join Date: Jul 2007
Posts: 765
Can you post a picture of your 930? I wonder If I have seen it around.. I live in Centerville Ohio..
Old 02-12-2008, 04:51 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
935TURBO's Avatar
 
Join Date: Jan 2007
Location: PARIS & BURGUNDY....FRANCE
Posts: 439
you probably will need spacers for the rear wheels....around .5 to 1".......
__________________
Serge, Gentleman Driver

https://www.facebook.com/photo.php?fbid=10207116408000968&set=gm.1723624077 855805&type=3&theater
Old 02-13-2008, 12:42 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,408
Garage
9&11 will fit, spacing may vary. What spacing do you have now, none in front and 2" rear?
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 02-13-2008, 04:56 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
Join Date: May 2004
Location: washington,DC
Posts: 1,087
l question the logic of this move, Porsche advises against it for structural reasons. The fact that you indicate your car is stock raises a flag also,the suspension and brakes will need a complete re-work to allow any balanced performance from the switch(according to Porsche).Having said that l have seen 18`s on early cars like yours and they can look good but it`s a cosmetic thing and not an upgrade,the extra unsprung weight will cancel out any improved roadholding. Your car is a 79? from age alone all the bushings are shot and need to be replaced and those low-pro hoops will exacerbate any suspension wear. post pics
__________________
my life begins at 150MPH
Old 02-13-2008, 09:37 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
930gt-40r's Avatar
 
Join Date: Jan 2007
Location: Boca Raton, FL
Posts: 2,063
Im in the process of trying to get 18s, but only for the reason that I cant find 17's that are wide enough to fit real rubber on. I need to get 11 wide in the back and 9 in the front, if anyone knows about 17s in these sizes, please let me know.
Sorry for hijacking.
__________________
Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 02-13-2008, 02:01 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,408
Garage
+1 on the 18s, there are no tires for 15s, 16s, and limitted for 17s.
You need to stay as close to 25" tall as you can. A 315/30-17 would be perfect but they don't exist.

Porsche is full of $hit with their comment on tall wheels. What's the diference between running a 25.5" tall 18 wheel with 12" wide tires or a 24.5" tall 15" wheel with 13.5" wide tires? I've done both on my SC for a decade with zero issues. Maintain your car properly and you'll be fine.
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 02-13-2008, 07:56 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered User
 
David's Avatar
 
Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,578
Garage
I forget what my back spacing is, but I posted it so some searching should turn it up.

I agree that the 18's should work fine. The 930 has really beefy bearings and the 18's aren't any heavier than the 17's.
__________________
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)
Old 02-13-2008, 11:47 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered User
 
Join Date: Nov 2000
Location: cincinnati,oh
Posts: 66
That's the reason I'm opting for the 18's. Very limited 315/35/17 availability. Although Nitto nt-01 and hoosier make tires that size. What is going to be available in 2 or 3 years? Lot's of tire choices in 18 inch land. And into the future. I am also upgrading the suspension using Elephant racing products.
Old 02-14-2008, 11:24 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered User
 
Join Date: Sep 1999
Posts: 301
My '78 930 runs 11s in back, on 315/35/ZR17 Pilot Sports. Not a true track tire, of course, but it will do there in a pinch, and a good street tire...
Old 02-16-2008, 09:34 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered User
 
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 3,415
+1 RarlyL8.
Old 02-18-2008, 01:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered User
 
Join Date: Apr 2003
Location: Terre Haute, IN
Posts: 2,853
Send a message via Yahoo to Lukesportsman
I've said this before (biased since I run 18's of course) but does Porsche recommend 22/31 TB's? Does Porsche recommend coil overs, huge sway bars and solid mounts? Does Porsche recommend aftermarket parts? Sure they came out to make a statement against 18's on earlier cars, but that is way before they started putting 19's and 20's on their new rides. I'm just saying that Porsche the company has different criteria for their rec's than we the enthusiast. If "P" came out and said not to run bronze bushings, would we all remove them and reinstall rubber?

It just gets old that "P" says something in a bulletin and we assume its the law. Obviously they have their reasons for saying it, but IT's not the only thing we do with these old beast that they would frown upon.

18's here 3 years and amazingly the windshield hasn't popped out of the old shell yet and that's at a bantam weight of 2325lbs.
__________________
Luke S.
72 RS spirit 2.7mfi, 73 3.2 Hotrod on steelies, 76 993 3.3efi TT, 86 trackrat, 91 C4s widebody,02 OLA winning 6GT2, 07 997TT, 72 914 v803996TT
Old 02-19-2008, 06:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
 
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 02:59 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization 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
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.