Mongo

I just got my rear 951 rotors today for my 1986 rear calipers. I noticed that they are smaller in diameter compared to the fronts. I checked the part numbers on the box and they are definitely 944 Turbo rear rotors. The front rotors that are on the spindles are thicker and about 1/2" longer in diameter.

I checked the part number on one of the front 951 spindles and it is:
951 341 605 00

I think I might have 1987 951 front spindles and rotors if they are half an inch longer in diameter and are slightly thicker than rear 1986 951 rotors.

I also heard that the 1986 951 had the same brake rotor sizes on the front and the rear.

If I have 1987 951 struts, will they bolt up the same to my 1986 944; even after elongating the upper NA strut hole 5mm vertically????

michaelathome

This is a question definitely worth crossposting on the 951 board. Good luck!

Michael

Mongo

posted and still no response

Bri Bro

The number doesn't look correct. Is it 951 341 065 00? That is the P/N for a 86 951 front wheel hub. On the 87, the P/N went to 951 341 065 06.

tifosiman

Stig that part# is for an 86 spindle. It sounds to me like you have the right parts.

tifosiman

Sorry, I didn't notice this question before I answered your other question.

Woah, hold on a minute here. If you have 87 951 struts, there should be no need to elongate anything. They will bolt directly to the 951 spindle (no matter the year) with no modifications. I hope you haven't jacked it up by cutting on the struts already!

Stig, you and I have been over all of this several times on what you need to do and how everything fits together, and what parts work with what. Check out some of our old posts, PM's, and conversations about this. If you need me to go over it again with you let me know.

Mongo

I know Tifo, I know...I've been looking.

I contacted Danno a while back so that he can send me pictures of the modification of the struts. Call me crazy, but I still want to do the elongation with the '86 struts on my car. I definitely don't have '87 struts on my 944 already, but just thought I had '87 spindles.

Oh I appologize about the part number, it's 944 341 065 00....too much Warsteiner last night

nickg

the rear rotors will be smaller than the fronts in diameter. if you are changing your car from early to late offset suspension, you need the later stuff...all of it. if you are just adding turbo brakes to a n/a car that is early, you need to get 1986 turbo front hubs, spindles, rotors(front and rear) and a set of 86 turbo brake hoses. you can use all year turbo or s2 calipers as they will all basically be the same mounting, but you want to match the sets as they revised the piston diameters a few times. this is an easy swap. if you want to use koni shocks, just buy inserts and use you existing early housings, or use later ones(they fit, but i cannot remember the details) either way you need 16" wheels to clear the brakes. for changing over a late offset car to turbo brakes you will need calipers(same deal here) late turbo spindles(no hub, the offset is the same) and rotors all around... as I recall the hoses are the same(i may be wrong)
all mounts in the rear are the same fyi...early, late doesn't matter, they all will work with a turbo rear caliper with it bolting directly on(aluminum and steel, you can double check calipers by loking up rebuilts for an 83 and an 88 n/a...same) however you need to use the right early or late rotor to match the suspension offset. I have sold a bunch of these changeovers and have done several myself...very easy to do. the only other thing I suggest is a new bias valve and going to stainless lines(actually cheaper than oem replacements) new pads and rotors

Mongo

just the brakes Nick

nickg

87 turbo spindles have holes for an abs senser....

Oddjob

Actually, only if the car came with the ABS option in 87, otherwise they did not.

My 87T did not have ABS, and the spindles did not have the mounting point for the sensor, and the hubs did not have the pickup ring either. Same is true for the rear trailing arms - the arm is not machined for the sensor, and the stub axle does not have the pickup ring.

Because of this, installing ABS on a non-ABS car requires a lot of major part swapping.

tifosiman

That's correct, I have seen 87T spindles with no ABS sensor mounting points.

I don't think ABS was standard until the following MY for Turbo cars?

nickg

all the 87's I have had or seen had the holes, but it may have been that they did a running change or they were replaced at one time.

Oddjob

Part numbers for late offset (87+) spindles and hubs are different for cars with and w/o the ABS option. And as mentioned, the difference is the mounting point for the sensor on the spindle and the pickup ring on the hub.

The ABS wiring harness is separate from the main harness and does not exist in non-ABS cars, the mounting brackets for the ABS ECU does not exist, the mounting bracket for the ABS hydraulic unit does not exist and additional modifications to the inner fender apron (the actual tub body) are required. 3/4 of the brake lines are different. The wiring connectors for the brake wear indicators (and the ABS sensors for cars with ABS) are different. Its amazing how many changes the factory made in production parts for the ABS option.

The non-ABS spindles and hubs do now superceed to the ABS parts, since porsche no longer stocks both sets of replacement parts. But I believe it would not have been any earlier than MY89 when ABS became standard on the S2 models, and probably later than that until existing inventory was depleted.

Both my 87T and 87S were non-ABS cars, and neither of them had any ABS compatible components on them. The 87T is a late MY production car.

I retrofitted ABS onto my 87T, so I have gone through the chase of trying to find 87T spindles and hubs w/ ABS, and they are few and far between (it was an expensive and somewhat rare option for MY87). Ironically, many salvage yards tried to tell me that all 87T's came with ABS (incorrect).

I ended up limiting my search to either 944S2 or 968 spindles and hubs, since they had ABS as standard.