spidey

I tried this over on the wheel / tire board but it gets no traffic, so is there anything I shoiuld do suspension wise to put 17 inch wheels on my S.? I'm probably going to upgrade the springs / shocks anyway, so I'm open to suggestions. TIA

Tabor

I think Porsche say you should update your caster mounts to the 968 units. These are the mounts furthest back on your a-arms.

porker

Ask Tim Strayer, and his new found buddy ALLDATA. I've read there what Porsche reccomend to do, but I've left my login info at work.

If I see no reply tommorrow, I'll drop the info on to you.

Mike

kevin Dubois

this is my '87 944S (RIP) the wheels were 17's and the suspension was stock. i never heard any wheel rub and the fit was very clean looking.

Tabor

I too run 17" wheels on stock suspension. But Porsche thinks you need to update the rear caster mounts. I was going to next time I had my control arms off.

spidey

Thanks for the help, I got an email with the Porsche reccomendations (thanks porker). I'll post some pics when I finally get done.

rangelica

Here is the Porsche Tech bulletin for adding 17" wheels.


Rick

'86 951
APPROVED WHEELS & TIRES: NEW SPECIFICATIONS
Article Text

ARTICLE BEGINNING

TECHNICAL SERVICE BULLETIN

17 INCH APPROVED WHEELS & TIRES

Model(s): 1987-On Porsche 944 (with M30 option) 1987-On Porsche 944S (with M30 option) 1987-On Porsche 944 T (with M30 option) 1988 Porsche 944 Turbo S
1989 Porsche 944 Turbo
1989-On Porsche 944 S2
Group: 4
Bulletin No.: 9303
Date: September 28, 1993

SERVICE INFORMATION

Concern

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

SERVICE PROCEDURE

Installation Information
1. Front and rear fender well lips must be reworked and/or checked for adequate tire clearance. See Fig. 1.

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

3. 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 Fig. 2.

4. Vehicles must have a rear stabilizer bar.

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

6. 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 00 may be used.

7. 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).

8. When using this rim and tire combination, a 17mm 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.

9. Not for Cabriolet vehicles.

APPROVED WHEEL & TIRE TABLE

Tire size Rim size Offset Position Note

225/45 ZR 17 7,t Jxl7 AH 65mm Front Summer tires
255/40 ZR 17 9 Jxl7 AH 55mm Rear (See installation
information
A through G.)

225/45 ZR 17 8 Jxl7 AH 52mm Front Summer tires
255/40 ZR 17 94.@ JX17 AH 68nm Rear (See installation
information
A through I.)

205/50 R 17 7;-i Jxl7 AH 65mm Front Winter tires
225/45 R 17 8 Jxl7 AH 52mm Rear (See installation
information A through G.)

NOTE: When using this rim and tire combination, a 17mm 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.


PARTS INFORMATION TABLE

Description Part Number Quantity

Spacer Ring 951 331 611 02 2
Wheel Bolt 904 341 671 00 10

Wheel Nut 999 1 82 003 36 10
APPROVED WHEEL PART NUMBER TABLE
Size Offset Part Number

7;-i Jxl7 AH 65mm 96536212405
8 Jxl7 AH 52mm 96536212601
9 Jxl7 AH 55mm 96536212800
91.@ Jxl7 AH 68mm 96536212805


APPROVED TIRES AND SIZES (SUMMER VERSIONS) TABLE

Size Makes

225/45 ZR 17 Front Bridgestone Expedia S-01 Nl
255/40 ZR 17 Rear Continental Sport Contact CZ 91 NO
Pirelli P700-Z NO
Yokohama A 008P NO
Michelin MXX 3 NO or MXX NO Pilot SX


APPROVED TIRES AND SIZES (WINTER VERSIONS) TABLE

Size Makes

205/50 R 17 89 H M&S Front Bridgestone WT05
225/45 R 17 90 H M&S Rear Continental TS 750
Pirelli winter 210 Performance


SUSPENSION PART NUMBER TABLE


Suspension Parts

1. Rear Mount


Part Number Quantity Required
951 341 023 00 2 each


2. Eccentric 951 341 431 02 2 each
3. Nut (torque to 100 Nm) 900 910 115 02 4 each


END OF ARTICLE