I am upgrading the stock brakes of my 88 S4 to a set of Brembos, I need to upgrade my wheels............my question is..... will the RH wheels fit over these brakes?

Brakes : http://www.racetechnologies.com/product ... he_928S4GT


Wheels : http://www.rh-wheels.com/index.cfm?P=wh ... &PID=67579

 

Both links show up without any product you probably wanted to include.

But generally you will need an 18 inch rim to use 6 piston brakes as the 17's are most likely too small and tire choices are limited.

 

You'll need to figure out how far out the calipers end up when using those 355mm disks. I'm not sure how much extra swept area you'll get, but they will be farther out. Search for a few threads by XSChop that include fitting 355mm Cayenne rotors (with centering rings), and there are some wheel specs shared. His centering rings and caliper adapters (uses your existing 4-pot Brembo's) are a fraction of the cost of the RaceTechnologies 928 S4 package you are looking at.

 

The brakes link should be this one:

http://www.racetechnologies.com/prod...orsche_928S4GT

 

For a daily driver, the heavier and dirt cheap Cayenne rotors are the way to go. However those brakes in the link are much lighter but cost much more. But if you're serious about performance and ultra lightweight, then hunt down a set of PCCBs and adapt them. 55lbs total unsprung weight redux....
I'm mocking these up next weekend.....

 

No idea what you want to achieve but afew observations:

The typical upgrade route for brakes is the GTS caliper/disc that cost in the region of US$2k if my memory serves me correctly. You can also use the 33 bar rear bias valve as well. Would you need more brake than this? I use the Hawk street plus pads- very squealy under light braking.

The RH wheels do not appear to offer wheels with the correct offset unless they do custom specials. The rear should be OK- 10 inch ET54- they will work well. For the front they only appear to offer a 8.5 inch with ET60. This will take a 245 section if that is enough for you.
I note that the RH wheels appear to be cast alloy centres- ideally you want forged centres this probably explains their pricing.

If I was going through this again I would be looking at other makes/prices albeit the Speedline look alikes are attractive.

You are wise to be aware of the need for the spokes to clear the calipers- once you get an offset close to where it should be the spokes run very close to the caliper [ask my fingers how many times they have been pinched when mounting the front wheels!].

I believe the ideal wheel setup is front 9.5 inch with ET68 and rear 10 inch with ET60 and go for 18 inch wheels [more tyre choices]. Forged wheel centres are very strong and RH probably cannot do the optimal offsets because they use cast centres- hence the cheaper price. Take a look at Forgeline and Fike websites.

Regards

Fred

 

The most cost effective upgrade for the S4 brakes are:

1. Replace the front rotors with GTS rotors, buy new GTS bolts for attaching the calipers to the axle, then get 10mm spacers to move the S4 rotors away from the axle. Gives 75-90% of the improved braking of the GTS calipers/rotors with about $6-800 less cost

2. Replace the original 18 bar rear bias brake valve with a 33 or 45 bar valve. Thus, balancing the improved braking of the front wheels with higher pressure potential at the rear brakes.

3. IF you want to risk even more rear braking, buy a pair of 993 rear brake calipers on eBay for a hundred or so bucks. They mount just like the OE S4 rears, use the same rotor and pads, but have 24% larger pistons. Even more rear brake pressure on the pads.

 

Thanks for all the help!

 

bad idea #2... did it, (33bar) and the car was undriveable at the track. under threshold braking the rear braking , plus compression braking is too much for the rear end to handle
good idea #1. ive done this and it works well. now using 13" rotors with S4 like calipers and its perfect. (using custom hats though). before, the GTS rotors worked well for a nice 322mm set up.

 

the links go to the 328mm brembo kit... how do those mount to an s4?
how are the two piece centers hub centric? the centering screws are not the best way to center the rotor hats.... im doing that now with a set of custom hats. not good. however, im using the racingbrakes rotor rings and they are working well for racing and look fantastic.