Trying to find wheels for my Z which will be 5 lug swapped sometime this year. Would really like to run rpf1's but they only come in positive offsets which would require a spacer.
From my research it looks like the rear needs a 1.5" spacer and the front needs a 1.75" spacer. Would this be safe and trackable or am I aaking for trouble?
At those sizes, they would need to be the type with their own studs and I'd make sure they fit the stock bore center on the hubs.
I'll agree with Stefan. As long as they're bolt-on spacers with their own studs and they have the correct center bores, it should be safe.
I've done SCCA Autocross and over 100MPH trap speed in the Javelin on 1.5" and 2.5" spacers...
Like said, the ones with their own studs should be fine. Ive got 126k miles on my truck with 1.5" ones.
Porsche 930s came with some really thick spacers on the rear from the factory. The rear wheel studs are like 4" long.
Javelin wrote: I've done SCCA Autocross and over 100MPH trap speed in the Javelin on 1.5" and 2.5" spacers...
I hope you're referencing two different events there, no autocross should be hitting 100 mph.
To the OPs question, you are putting a greater load on your wheel bearings when you run spacers like that but it shouldn't be the end of the world.
Where would one be able to buy spacers this large? Or are they more of a custom affair?
I know Motorsport Tech will make bolt on spacers / adapters up to 2" or so in whatever bolt pattern and center bore combo you want. Not sure who else makes ones that large beyond a couple of off the shelf options for off-road guys.
Anyone who actually makes their own spacers will be able to cut them to any size, literally might have to change one line of code and buy longer studs and you can have 3in instead of 1.5in. But how many companies that sell spacers actually make their own?
Don't be a slave to a particular wheel You and no one else can tell the difference when driving.
chiodos wrote: Anyone who actually makes their own spacers will be able to cut them to any size, literally might have to change one line of code and buy longer studs and you can have 3in instead of 1.5in. But how many companies that sell spacers actually make their own?
Fing a semi place locally that makes them. ~300-400 an axle to have them made.
Audi guys use the hell out of thick wheel adaptor spacers to put cheap Corvette takeoff wheels on older 5- and 4-lug Audis, including for track days and autocross.
The adaptors are expensive, but you only need ONE set, while you can have all of the $100 Corvette 17x9 wheels you want...
Don't worry about center bore, Z's are lug centric. Not hub. I mean it does need to fit over the hub spot, and the outside surface of the spacer should fit the rims. But if the rim is also lug centric no big deal.
I crewed for a GT3 team running a BMW 2002 thousands of years ago, and we ran 1" spacers on long ARP studs for 15+ years without the slightest problem.
Looks I have a bit more research to do then.
KyAllroad wrote:Javelin wrote: I've done SCCA Autocross and over 100MPH trap speed in the Javelin on 1.5" and 2.5" spacers...I hope you're referencing two different events there, no autocross should be hitting 100 mph.
Uh, sorry, should have made that more clear. Yes, 2 different events. Trap speed is 1/4 mile drag racing. 
My source for bolt-on spacers is optauto.com. They have a few different (good) brands. Lots of potentially sketchy options on eBay.
I've got some miles on a set of these (the ones I mentioned earlier): http://motorsport-tech.com/wheel_adapters.html
Only 3/4" thick for mine, but they're well built.
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