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Wow that's what I said right these are not rears they are fronts , they fit my 89 s4 front spindles perfectly, wow you try and help someone out, and yes my info about the GTS and gt specs were off these will work just fine,its amazing all of the Monday morning quarter backs there are on this site, Enjoy the Hateraide. Will not reply to this topic again.
How heavy is that chip you are carting around on that shoulder?
Dear fellow Rennlisters and 928 lovers, please do not hesitate to point out my mistakes in any of my future postings, because I know you are doing it for my well being and for the greater good of this site. Correcting me and pointing out my errors only reinforce my thoughts that you actually care, not that you are belittling me.
A parent would stop any child from holding a knife on its blade while learning to cut.
Mrspencer. Glad the rotors work for you S4 and they do look very nice and they are very inexpensive, Thanks for the heads up if I ever get another S4 in the future.
I have GTS brakes on the blue car (1987 S4 Strosek Widebody). Over here in Europe I have not been able to source any inexpensive front GTS rotors, only the genuine Porsche parts. Maybe some vendors in the new world like Roger can supply aftermarket GTS rotors at a better price but shipping over here will be costly. The rotors are heavy.
Åke
The 94 turbo 3.6 and the 928GTS used the same front rotors. The only difference is the 928 was solid and the turbo cast hole. I switched my fronts on my GTS with 3.6T rotors. It makes it easy since I have 4 cars using the same rotors.
part numbers are 96535104500 and 96535104600. I don't know if Roger is selling factory rotors or aftermarket but you can pick up stock factory 94 turbo rotors for around $200 each. Just make sure they are for the 94 turbo and not the 91-92 3.3L turbo.
If you want slotted the only option is to have factory GTS rotors slotted by someone or purchase an aluminum Hat and have custom made coleman rotors but that will be pricey..
This is what i did on my track car but these are using 993 hats for the time being which has a 5mm different offset. These will not work on the 928 or 968. But you can have a hat made up for the 928 application. I also added pictures of the stock turbo rotors which are a direct bolt up to the 928GTS.
I'm glad Cobalt included the info on the 911 (964) 3.6L Turbo... as having more info for our cars is better than less for sure! The price vs. availability issue arises when you consider both the 928GTS & the 3.6T were low production vehicles, so the parts only get produced when the demand is there ($$$). Search for both vehicles when looking for the 322mm rotors... I also run the 3.6T (cast holes) fronts & rears on my S4 (with the big brake upgrade).
As for the other poster (Mrs Pencer) taking offense... yes, the '87-'91 rotors all bolt up on an '89 -no worries there. BUT, if you did the GTS big brake upgrade, and bolted on '89 spec rotors... they will bolt on and "fit" -but will use a smaller portion of both the rotor and pad (contact patch) to stop the vehicle... AND THAT IS UNSAFE. We all look after each other here -even newbies like you- to impart our collective decades of real world experience -trial and errors included.
So, take heed to those who take the time to post... they may have tried many different combinations in their varied pasts, and will save you from making the same costly mistakes on your own.
Just my .02
Last edited by White Lightnin'; 06-20-2017 at 02:51 AM.
I'm glad Cobalt included the info on the 911 (964) 3.6L Turbo... as having more info for our cars is better than less for sure! The price vs. availability issue arises when you consider both the 928GTS & the 3.6T were low production vehicles, so the parts only get produced when the demand is there ($$$). Search for both vehicles when looking for the 322mm rotors... I also run the 3.6T (cast holes) fronts & rears on my S4 (with the big brake upgrade).
As for the other poster (Mrs Pencer) taking offense... yes, the '87'-'91 rotors all bolt up on an '89 -no worries there. BUT, if you did the GTS big brake upgrade, and bolted on '89 spec rotors... they will bolt on and "fit" -but will use a smaller portion of both the rotor and pad (contact patch) to stop the vehicle... AND THAT IS UNSAFE. We all look after each other here -even newbies like you- to impart our collective decades of real world experience -trial and errors included.
So, take heed to those who take the time to post... they may have tried many different combinations in their varied pasts, and will save you from making the same costly mistakes on your own.
Just my .02
here is a pic of my calipers,aand rotors , they fit like a glove , where are my pads not sitting correctly, what's unsafe, pls enlighten me I may be new here, but not to cars, so if I come off a little irritated, I posted here to give people an option, my 85 s3 will run this setup, awaiting caliper bolts and braided lines. So someone else posted that my front rotors looked like rears if they knew anything they would see that rears have a diffrent shape allowing for the parking brake.
Look at where the pads sit.they sit exactly where they're supposed to.I told myself not to get worked up, I know what I have and that's just fine with me, cheers to all .
here is a pic of my calipers,aand rotors , they fit like a glove , where are my pads not sitting correctly, what's unsafe, pls enlighten me I may be new here, but not to cars, so if I come off a little irritated, I posted here to give people an option, my 85 s3 will run this setup, awaiting caliper bolts and braided lines. So someone else posted that my front rotors looked like rears if they knew anything they would see that rears have a diffrent shape allowing for the parking brake.
Look at where the pads sit.they sit exactly where they're supposed to.I told myself not to get worked up, I know what I have and that's just fine with me, cheers to all .
Okay... so it looks like you have '89 S4 spindles on an '85 S2 (S3?)... but what about the caliper mount? If your mount is for an '85 sized rotor -and if it's smaller than an '89 -problems.
But, going on the premise of this thread, IF you have the GTS Big Brake upgrade, then your caliper mount is different also... and putting a smaller diameter rotor on a setup made for a larger diameter, there will likely be problems. That's why the mount is included in the upgrade -to move the caliper to the outer diameter of the larger rotor... can't put a larger rotor on without it, and with it -you shouldn't use a smaller rotor.
I can put any rotor inside of a caliper and sit them on the floor and it will "look right" -but mount the caliper and mount the rotor -on the car- and if the caliper mount puts the caliper out where the diameter of the rotor is supposed to be, then mounting a smaller rotor will be wrong.
Again, this thread is about sourcing GTS rotors for those that either HAVE a '93-'95 GTS or for those that have done the UPGRADE to use these big brakes.
Commentary outside the scope of this thread is unnecessary... perhaps comment in a thread that references other-than GTS sized brakes....?
And yes, mixing parts without the appropriate ancillary/supporting hardware IS unsafe.
Looks like a rear to me. Parking brake drum inside from the photo.
Originally Posted by Mrspencer
So someone else posted that my front rotors looked like rears if they knew anything they would see that rears have a diffrent shape allowing for the parking brake.
When a rotor has a machined surface inside the back of the hub, vs. a painted surface, it would naturally look like a rear rotor (BTW, the rear rotors are the same on the '87-'91 S4/GT as they are on the '93-'95 GTS).
And with Chris's experience custom building a 928, he has probably forgotten more about 928's than a lot of us know... so take care in offering up insults to others posting here.
Okay... so it looks like you have '89 S4 spindles on an '85 S2 (S3?)... but what about the caliper mount? If your mount is for an '85 sized rotor -and if it's smaller than an '89 -problems.
But, going on the premise of this thread, IF you have the GTS Big Brake upgrade, then your caliper mount is different also... and putting a smaller diameter rotor on a setup made for a larger diameter, there will likely be problems. That's why the mount is included in the upgrade -to move the caliper to the outer diameter of the larger rotor... can't put a larger rotor on without it, and with it -you shouldn't use a smaller rotor.
I can put any rotor inside of a caliper and sit them on the floor and it will "look right" -but mount the caliper and mount the rotor -on the car- and if the caliper mount puts the caliper out where the diameter of the rotor is supposed to be, then mounting a smaller rotor will be wrong.
Again, this thread is about sourcing GTS rotors for those that either HAVE a '93-'95 GTS or for those that have done the UPGRADE to use these big brakes.
Commentary outside the scope of this thread is unnecessary... perhaps comment in a thread that references other-than GTS sized brakes....?
And yes, mixing parts without the appropriate ancillary/supporting hardware IS unsafe.
you are right about the original post, where to source gt,gts rotors, and my entire set up is from the 89s4, I had to chuckle about the set up on the floor comment, all I was trying to say was I bought my rotors for my set up from this source, I was wrong on the gts specs and stated so, but anyway, bolt holes all line up.on the floor or the CAR had them mocked up on the CAR, the removed for cleaning,and new hardware.
...back to our previously scheduled programming...
Anyway, the set of rotors (holed) that came with my upgrade kit when new were in Zimmermann boxes (no Porsche labeling). Not sure the maker of Roger's rotors, but they work as designed and seem to be priced well. If there's enough demand, perhaps the next run will be priced lower...
Fronts will have a Left/Right part number difference, but rears are the same side to side.
Fun fact: the S4/GT/GTS factory rear calipers are the same as the fronts of a 944 Turbo... but that's another subject.
Last edited by White Lightnin'; 06-20-2017 at 01:46 PM.
Cobalt, thank you for the insight. I just purchased the 964 3.6T drilled rotors for my 94' GTS. I would have never known you could do that unless you had installed the big reds from 993 so those will look very nice!
Question, what is the difference between the GTS and 993 calipers? Are the 993's larger, maybe on the turbo? I was thinking they were 355mm rotors. I have a 993TT and wondering how different these brakes really are.
Cobalt, thank you for the insight. I just purchased the 964 3.6T drilled rotors for my 94' GTS. I would have never known you could do that unless you had installed the big reds from 993 so those will look very nice!
Question, what is the difference between the GTS and 993 calipers? Are the 993's larger, maybe on the turbo? I was thinking they were 355mm rotors. I have a 993TT and wondering how different these brakes really are.
Thanks again!
Bryan
Bryan,
Glad I helped. I have them on my GTS and it is more a visual touch, but why not?
So the front calipers are essentially all the same. Big Blacks (GTS) big red or blacks 94 turbo 3.6 and reds 993TT. The only difference is the 928 is mounted aft of the shock and the 911's ahead so you need to swap the bleeds and feeds. I have 928 GTS caliper on the front of my 964 C2. The difference between the 993TT and 928/964T is that the 993 uprights are aluminum vs cast steel and use a two piece rotor that uses a 5mm shorter hat than the 928/964T. Otherwise they all use the same size rotor 322x32mm.
06-13-2017, 01:05 PM
