That's enough room to clear the spokes. The 14" rotor may be pushing it on a 17" diameter rim though.

 

So in my case, the CTS-V caliper and 14" vette rotor would clear the spokes? but not necessarily fit inside the hoop of the wheel. If I had a CTS-V Caliper I would test fit it.

 

Yes.

If you have the F-body rotors now, swapping them to the y-body adds .25" then the calipers are 3/4" wider, so the combo adds 1" of thickness. If you have 1" or more clearance right now, then they should clear.

Remember what Fast377 said:
Some wheel hoops are tapered more in the middle than others, so I can't say for sure.

 

so in theory this kit CAN be run if our current wheel combo has more than an inch of clearance? i've read this thread 3 times and i'm more confused every time i read it. it makes my head hurt.

ps- thanks jason for still responding to questions in this thread

 

Well I started this thread, so I feel a certain responsibility.

I'll try to simplify this even more. Lets say you have your stock LS1 brake setup and only swap to this 4 piston Brembo caliper. The 2 extra pistons on the outside make it stick out 3/4" more than the stock caliper.

So you lose 3/4" spoke clearance right there and there's nothing you can do to change that.

Then when you swap from the F-body rotor to the Y-body (vette) rotor, the offset is different. It sticks out 1/4" more. So you lose a 1/4" spoke clearance here.

Now you might think "That's a bad choice of rotor, lets find one that doesn't stick out any more at all."

The down side with the vette rotor is you lose that extra 1/4" of spoke clearance, but the up side is that it lines up the caliper with the rotor. This is what makes it practically a bolt on unit to your LS1 spindle.

Does that help?

 

Makes perfect since to me.

 

me too, kinda i have 2 more questions

i assume by y-body rotor, you mean the 14" Z06 rotor right? and also, this caliper can work with both the 12.75 stock rotor AND the 14" z06 rotor?

 

All 3 diameters of C5 and C6 front rotors have the same offset.
13" ------ stock
13.5" ---- Z-51
14" ------ C6 Z06


What vehicle has a 12.75" rotor? Please explain in more detail.

 

i'm sorry. i meant to say our LS1 Fbody rotors. you said you lose clearance by moving to a y-body rotor but i'm just shocked that a caliper can work with such a wide variety of rotor diameters.

 

The way that works is:

The caliper is shaped in an arc for a certain diameter rotor. This Brembo has a large arc (14") so smaller diameter rotors can fit it just fine. You might even squeeze a 15" rotor in it.

Now the stock F-body caliper was built with a smaller arc shape (12"). Now you can squeeze in a 13" rotor, but a 14" just won't get in there far enough.

 

cool, thanks. i'll be doing this over the winter months with the 14" rotors. i'll take pics along the way in case i'm the first to do the install. thanks for all your help along the way. i'm utterly shocked that no one has taken advantage of this hidden gem and upgraded their brakes

 

It's been done lots for the third gen guys...myself included. But spoke clearance isn't an issue for us. I'll be doing something on my '99, but I'm waiting until I change wheels...that will dictate what brakes I go with.

 

I'm running 18x9" OZ superleggeras so i'm sure i'll be alright with clearance. there is a lot of room under those wheels. i'll measure one of these days to make sure.

 

You would be surprised. They didn't fit my 18x9.5s. I still needed about .5".

 

Will the C6 ZO6 brakes fit with aftermarket 18X9.5 C6 ZO6 wheels?

 

They will fit with (factory for sure...don't know about aftermarket) C6 Z06 front wheels and C5 conversion brackets. There are a couple of guys on here running that swap.

 

I have the porsche kit (4piston brembo/porsche rotors)and to space the rotor out far enough to not hit the spindle I use a spacer in between the hub and the rotor.I also had to change wheels because the spokes would not clear the caliper.

To have reasonable assurance that it will all fit use an 18" wheel with spokes that meet the outside of the rim, forget about any deep dish polished rim wheels.

Look forward to eating your dash if you brake hard and don't wear your seatbelts and being very aware that most cars behind you will engage ABS trying to stop like you do.
While having really good brakes is great and it's amazing to stop almost as hard as you can acelerate it also makes day to day driving "more interesting" especially in panic stops.

If this setup works for half the prise of the porsche kit (2k +) don't hesitate, just do it. You won't be sorry.

 

fast you said clearance wasn't an issue but you were having some trouble with 18x9.5? can you please elaborate, looking to do this swap myself.
Thanks!

 

With the 18x9.5s on the '99, the cts-v caliper still hit the spokes. But that same wheel on my '91, with the cts-v caliper, I had other issues. Like Jason said, every wheel is made different. Some have a higher arch on the hoop. In my case, my wheels are 2 piece. Where the spokes bolt to the hoop, there is a little lip which interfered with the caliper. But, since I run 4th gen wheel offsets on my third gen, I have 2" wheel spacers in the front. So I can pretty much clear anything.

 

fast: thanks for the info, did the stock line actually reach on the 99? damn i miss my 3rd gen!