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Will these wheels fit my 924 Turbo?

 
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Johann  



Joined: 07 Aug 2016
Posts: 154
Location: Netherlands

PostPosted: Sat Aug 05, 2017 3:42 am    Post subject: Will these wheels fit my 924 Turbo? Reply with quote

Gents,

I have come to the conculsion that the OEM 15" Turbo wheels are not doing the road holding of my 931 any favours. The tyre wall are too soft and too high. This makes the car too soft in corners for my liking. I can buy a set of period correct 16" MSW wheels for my car for a great price. Going to 16" reduces the height of my side walls and allows me to buy wider N rate tyres. All of this should vastly improve the handling of my car through the twisties. However, I am unsure if they will fit. I hope you can help.



The specs are:
Size 16 Inch
Width: 7J
Et: 23

I think they will fit, but I am unsure of the offset.

If they fit I will have them refurbished to have gold centers with the goal of achieving this look


Your help is greatly appreciated.


Last edited by Johann on Sat Aug 05, 2017 4:07 am; edited 1 time in total
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ideola  



Joined: 01 Oct 2004
Posts: 15429
Location: Woodstock IL

PostPosted: Sat Aug 05, 2017 3:56 am    Post subject: Reply with quote

7Jx16ET23 is the offset for a standard 944, which means these will stick out an inch further than the narrow body arch. You can solve this in the rear by eliminating the standard 22mm spacer, but you will have trouble up front. I've seen some posts where guys have gotten ET23 wheels to work up front by dialing in a lot of negative camber, but you will then wear through tires a lot faster.

Normally, a narrow body 924 will do best with standard "late offset" 944 wheels, or what I prefer to call "high offset", e.g., in 50-60mm of offset. You can go up to 8" with no trouble in the rear, but 9" will cause you some trouble with inner wheel well and brake line clearance, which you might be able to address with some creative modifications to the brake line routing. Also, at 9" you may need to roll the inner edge of the fender. The widest I've gone up front on a narrow body 924 is 7Jx16ET52
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15 981 GTS | 04 955 Turbo | 88 924S SE | 82 931 (x2) | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod (x2) | 78 Poli-Form | 78 Limited Edition | 77 Martini
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Johann  



Joined: 07 Aug 2016
Posts: 154
Location: Netherlands

PostPosted: Sat Aug 05, 2017 4:05 am    Post subject: Reply with quote

Awesome, thanks for the advice Dan! I had a feeling that there was going to be an issue on the front. I don't want to run a lot of negative camber, so I guess I will just have to keep on searching.

When I bought my 931 it actually had 944 S2 D90's on, but I did not like the look very much.

In then end I might just end up having a custom set of BBS rs's made up
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Cédric  



Joined: 27 Aug 2004
Posts: 1559
Location: Sweden

PostPosted: Sat Aug 05, 2017 4:29 am    Post subject: Reply with quote

Several of us run et23 7'', but as said above it need camber to fit perfectly. What tyres do you use, you could also buy some much sportier tyre with much stiffer sidewall to get similar effect.
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http://www.garaget.org/show.php?car=211
´80 924 Turbo
http://www.garaget.org/?car=160275
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Johann  



Joined: 07 Aug 2016
Posts: 154
Location: Netherlands

PostPosted: Sat Aug 05, 2017 4:46 am    Post subject: Reply with quote

I am currently running Vredestein Sportrac 5 in 205/60 R15 with a V rating.



It was the only sporty tyre I could find in 15" at the time. I know I can buy the Pirelli p6000 but a €180 per tyre I find them quite pricey. Added to that my experience with Pirelli has never been good.
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1438
Location: Somerset, UK

PostPosted: Sat Aug 05, 2017 5:55 am    Post subject: Reply with quote

7x16 ET23 with 195x50 R tyres work for me. Clearly no spacer at the front but will need rolled rear arches if you want to use more than a 10mm spacer. I’m using the stock 20mm spacer on the rear to square up the track of front and rear axles. Obviously the suspension is running lowish with with small amount of neg camber. Circa 1deg up front and 1.5 at the rear. Not excessive at all

So no poke issues at the front as suggested. No big camber issues and no tyre wear issues due to too much camber. All is well and it rides road and track very nicely

Untitled by stevenmcooper, on Flickr
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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ideola  



Joined: 01 Oct 2004
Posts: 15429
Location: Woodstock IL

PostPosted: Sat Aug 05, 2017 6:09 am    Post subject: Reply with quote

This is odd because I attempted putting 7Jx15ET23 cookie cutters on my erstwhile 81 NA and they stuck out past the fenders by an inch.
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15 981 GTS | 04 955 Turbo | 88 924S SE | 82 931 (x2) | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod (x2) | 78 Poli-Form | 78 Limited Edition | 77 Martini
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1438
Location: Somerset, UK

PostPosted: Sat Aug 05, 2017 6:21 am    Post subject: Reply with quote

I ran 205 55 Proxes on the stock 15's. The tyres were to soft in the sidewalls at 55, partly due to road tyre and partly due to profile. Must be worse with 60's? But 205 50's look to low profile and too small in the arches compared to 55's

Untitled by stevenmcooper, on Flickr
_________________
1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
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Cédric  



Joined: 27 Aug 2004
Posts: 1559
Location: Sweden

PostPosted: Sat Aug 05, 2017 6:35 am    Post subject: Reply with quote

T1r have very sloppy sidewalls, i have them on my d90s at the moment. Maybe you could try ad08 Yokohamas, kuhmo ecsta mx ku36 or similar if you want a much more focused tyre bit. A bit more negative camber could be added as well, gives much better front end grip, depending on tyre.
_________________
´79 924
http://www.garaget.org/show.php?car=211
´80 924 Turbo
http://www.garaget.org/?car=160275
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