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Can you fit 18" wheels on a 87 944T?

Can you fit 18" wheels on my 87 944 turbo?
factory suspention....and what size tires can you run?
thanks
Jim
Old 09-02-2003, 02:31 AM
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18 will fit, but it is not a good idea.
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Old 09-02-2003, 10:19 AM
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I agree.
Factory specifically recommended against 18" fitment as there has been reports of dasmage to the mounting areas.
17" is the one to go for.
Old 09-02-2003, 08:21 PM
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I'm looking at putting 18 on my 86 951. There is a 86 on ebay for sale with 18in wheels. I emailed the guy and he is running 225/40/18 and 285/30/18. He told me he has had no fit issues such as rubbing. With 18in wheels this car looks great and more modern!

to privous posters what specific damage can occur by running 18 on a car originally equiped with 16? Import cars are running 3 sizes up in many cases (civic 15 to 18in) with no issues.
Old 09-26-2003, 08:50 AM
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Jantes 18" sur Porsche 924/944/968/928

** Note Porsche du 23 Mars 1993 **

Number 9305, Model All, Part Identifier 4412

Subject:
Installation of Porsche 18" Wheels Not Approved

ATTENTION:
Service Manager/Service Technician

Models Affected:
All

Concern:
Retrofitting 18" wheels on Porsche vehicles which do not have 18" wheels as original equipment is NOT ALLOWED.

General Information:
Endurance tests have shown that equipping certain Porsche vehicles with 18" wheels in an application not already approved by Porsche Cars, N.A. may result in loosened bolts and/or threaded connections on the front wheel carriers. This, in turn, may cause fractures in these components. Fractures may also occur in the front strut mounts and in the body in the area of the rear suspension as a result of the installation of 18" wheels not already approved for installation for this specific application.

Such damage can occur without warning and the vehicle may become very hard to control or steer as a result of this improper installation.

Porsche dealer personnel coming in contact with a vehicle that has been retrofitted with 18" wheels in an application not approved by Porsche, should inform the owner of the vehicle of the potential for damage to their vehicle and loss of steering control. Porsche Cars, N.A. should also be notified of any vehicles retrofitted with 18" wheels.
Old 09-26-2003, 09:39 AM
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Hi Jim,
Since now you would probably want 17" instead of 18", here's some further advice:

Installation de jantes 17" sur un v®¶hicule ®¶quip®¶ en 16" (Porsche 944)


** Note Porsche du 28 septembre 1993 **

PS: Afin d'®¶viter la d®¶formation de certains termes techniques pr®¶cis, la note est pr®¶sent®¶e telle quelle, en langue anglaise.

Number 9303, Model 4 Cylinder, Part Identifier 4412

Subject:
Installing 17" Porsche wheels on vehicles previously equipped with 16" wheels.

ATTENTION:
Service Manager / Service Technician :
This bulletin replaces Technical Bulletin Group 4, Number 9303, dated 9-14-93.

Models Affected:
944 from 1987 with M3O option
944S from 1987 with M3O option
944 T from 1987 with M3O option
944 Turbo S 1988
944 Turbo 1989
944S2 from 1989

Concern:
Installing 17" Porsche wheels on vehicles previously equipped with 16" wheels.

Installation Information:

A. Front and rear fender well lips must be reworked and/or checked for adequate tire clearance.

B. Suspension travel must also be checked. Parts such as brake lines, hoses and brackets must have adequate clearance.

C. New caster eccentrics, rear mounts and nuts must be installed in the front control arms. This change is necessary due to a change in caster specification on vehicles equipped with Porsche 17" wheels. The specification for vehicles equipped with 17" wheels is 3°„15'-45 (see Figure A.)

D. Vehicles must have a rear stabilizer bar.

E. When adjusting vehicles to new caster specification, all alignment values should be checked at that time.

F. When summer tires are used on vehicles with 17" Porsche wheels, snow chains cannot be used. If winter tires are used, only snow chains with Porsche Part Number 911 361 924 OO may be used.

G. Tire pressures for front and rear 17" Porsche wheels is to be set at 2.5 bar (36 PSI) at approximately 20°„C (68°„F).

H. When using this rim and tire combination, a 17 mm spacer plate must be installed on the rear wheel hub. The customer must be informed that if the emergency wheel is needed, the spacer must be removed.

I. Not for Cabriolet vehicles.
Old 09-26-2003, 09:49 AM
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You certainly can add 18" wheels to a 944T (period)
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Old 09-29-2003, 02:19 AM
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Mike B,
I suppose the factory must be wrong or that 951s driven in Canada are immune from this particular problem and especially so in your case.
Just that you have not had an accident (yet) does not mean it will be safe for others to fit 18" wheels and risk their life in return for a "better" looking car.
It is irresponsible to advice against factory recommendations until you have some concrete scientific proof instead of just guesstimation based on your own experience.
Old 09-30-2003, 04:03 AM
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alibaba,

I have 18 " wheels on my 951. I upgraded the castor blocks and the diameter of the wheel remains the same as the stock 16" wheels I have. I would not recommend 18" wheels for a track car but my vehicle is used on the street.

Do you own a Porsche? Do you own a 944 turbo? Do you believe everything you read such as outdated factory bulletins? My answer is based on experience and the experience of other 944 owners. I might add none of the hundreds of 944 owners using 18" wheels have reported any concerns.

These are the facts!
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Old 09-30-2003, 05:46 PM
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Mike B
I have 17" cup wheels on my 1989 944 turbo S. I also have a set of 18" BBS LM wheels that I no longer use because the eccentric bolts fractured while I had them on, and thats a fact.
I guess I am the only one around having problems whereas everyone else is immune.
The factory bulletins are as you said outdated but then so is this particular model of Porsche. How would you expect the factory to "update" information on an "outdated" car? A 1993 bulletin for a up to 1991 model, I would say is not bad. Plus all problems should have surfaced by now for a car of this vintage anyway.
If my understanding is correct, you felt one should be safe as long as the rolling diameter of the tyre/wheel combination remains the same. However I cannot agree because stress on mounting components are more of a result of shock involved, hence the lower the tyre profile, the higher the shock and stress on these components.
Should the owner insist on fitting 18" wheels, I would recommend using them on track. Track cars are inspected more often and stress in components can be readily identified. Whereas most street cars do not get an inspection after every hard run though the likeliness of breakage is lower.
Lastly, to answer your question of Porsche ownership I also do own a 1992 965, a 1993 964 C2 and has owned a 1984 944 N/A, a 1989 928S4, a 993 powered 1989 911 Carrera and a 1988 turbo bodied cabrio in the past. I think I do qualify as a Porsche owner.
Old 09-30-2003, 07:43 PM
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alibaba from the tyre spelling where do you live. I suspect road conditions should be factored in when considering wear and tear. What is an eccentric bolt? Is that the studs off of the wheel hub? The last thing I want to do is destroy my 86 951, but you have to admit the 18 in wheels do look much better than 16 or 17. If you don't need the wheels what is the asking price on the BBS?
Old 10-01-2003, 05:36 AM
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alibaba -
not sure where you live if you have a US or ROW car. I am in Illinois - my cars are USA versions.

I have a 1989 944 Turbo and a 1995 993 C2 which has 030 option suspension with 17in Cup wheels.

The 944 is stock and I am thinking about putting my 993 Cup wheels on my 944. The present tire sizes on the Cup wheels are 205/50 and 255/40.

What size tires are you running on the 17 Cup wheels on your '89 944 Turbo ?

Would I risk damage to front end components if I keep the above tires on the Cup wheels ? According to Tirerack the rear size is the same but the front recommended size is larger - 225/45.

My assumption is that the risk of damage is due to the higher weight of the larger wheels and tires vs stock. For example, when I switched from my 17in Cup wheels to 18in Technology on my 993 the total (tire and wheel) weight difference was 2lb for each of the fronts and 1lb for each of the rears - IMHO that doesnt seem like enough to matter. Any thoughts ?
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Last edited by steven g; 10-21-2003 at 12:57 PM..
Old 10-21-2003, 12:54 PM
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I've seen some owner's running a Turbo 2 wheel under 944 turbos? What size and offsets are used to run these wheels and are they changing the coilover size?
Old 08-13-2018, 12:39 PM
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I mean, I hillclimb and autocross my 88TS on 18x10 and 18x12 MY02 with 3 inch adapters in the rear (because the wheels in the rear were widened on the inside). So, yes it absolutely can be done, and is done all the time.

Weights for any wheel size is all over the place. You could find 19s that are lighter than 15s, for example. I see no reason why 18s specifically would make a bit of difference assuming you have a similar diameter tire setup.

This car has been on 18s and raced by owners since... at least a decade ago?
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Old 08-16-2018, 10:16 AM
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I ran 18's on a 86 944T and now I have them on a 1990 944 S2 Cabriolet. I had to roll the fenders but that was the only issue I had.
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Old 08-17-2018, 10:55 AM
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