Rub limits

[c4lvinnn]

You cannot omit all these crucial variables to find your "hard and fast" rule. Period. Go and tinker and look at other threads for fitment.

And aesthetics only for changing 7" wheel offset? Ever see chicken legs on a fat person? Thats not really achieving much aesthetic there.

Dont skip leg day, bro.

[Spartarus]

Originally Posted by c4lvinnn

You cannot omit all these crucial variables to find your "hard and fast" rule. Period. Go and tinker and look at other threads for fitment.

And aesthetics only for changing 7" wheel offset? Ever see chicken legs on a fat person? Thats not really achieving much aesthetic there.

Dont skip leg day, bro.

Funny. Every see the lotus Elise? With those skinny-ass wheels? Doesn't look all that bad.

Also, not strictly aestheics. I'm losing 7 lbs per wheel, 1.5 lb per tire over stocks, and 16 lbs per brake, as I'm doing those at the same time.

That's 98 pounds of unsprung weight off the car, and that's before the cast-iron uprights come off for aluminum ones.. That's another 6.5 lbs per corner, and then we address the control arms and coilovers. I'll have nearly 150 lbs out of the car on just the suspension.

[Leonardo]

Originally Posted by Spartarus

Why not? The car handles great on N3000 215/45/17 tires. Why add a bunch more grip? I don't need it. I'm not building the fastest car in the world, I'm building a car with great handling that handles really well at the limit. It drifts great, and the final power will be sub-300 at the wheels. Why get an 8.5 inch wheel and a 245 section tire if I can't spin the f*ck out of it, smoke the tire, and have a grand old time?

The only reason I'm not keeping the stock offset is I hate the way it looks. This is an aesthetics-only modification. All I'm doing is making sure I'm not sacrificing function for aesthetics.

I can spin my 245 MPSS on a 18x9. Stock engine auto trans.

How many other frs/brz have you driven? What tire wheel did they have?

[strat61caster]

imo extended studs, cheap spacers, lots of experimentation and patience. It is hard to get 17x7's to rub without doing something silly.

Personal anecdote: I put my 17x9 +45 RPF1's on with 245/40 tires, removed the springs and let the car sit on the bumpstops, no rubbing or clearance issues anywhere (front struts were changed to a 2.25" spring so that will be your first hurdle, although not the direction you are concerned with). As far as I'm concerned you have nearly +/-1" of clearance for offset tweaks if you stick with 17x7's. Those front wheels at full lock rub the inner fender liners but clear no problem with a 5mm spacer, the +35's are more common for that reason (among others).

For reference, the picture on the left side will show how much bigger and further outboard many have gone without issue, regardless of ride height. This might be your best tool to compare what 'fits' in the fitment thread, and what looks pretty in the pictures to what you want to do.

http://www.willtheyfit.com/index.php...t2=35#isPage=2

Since you mentioned it, SCCA Street class has rules about changing the OE offset, something small like +/-3 or 5mm is the maximum allowed. Since you mention aftermarket suspension though I don't think STX and above has any rules about changing offset.

[Spartarus]

Originally Posted by strat61caster

imo extended studs, cheap spacers, lots of experimentation and patience. It is hard to get 17x7's to rub without doing something silly.

Personal anecdote: I put my 17x9 +45 RPF1's on with 245/40 tires, removed the springs and let the car sit on the bumpstops, no rubbing or clearance issues anywhere (front struts were changed to a 2.25" spring so that will be your first hurdle, although not the direction you are concerned with). As far as I'm concerned you have nearly +/-1" of clearance for offset tweaks if you stick with 17x7's. Those front wheels at full lock rub the inner fender liners but clear no problem with a 5mm spacer, the +35's are more common for that reason (among others).

For reference, the picture on the left side will show how much bigger and further outboard many have gone without issue, regardless of ride height. This might be your best tool to compare what 'fits' in the fitment thread, and what looks pretty in the pictures to what you want to do.

http://www.willtheyfit.com/index.php...t2=35#isPage=2

Since you mentioned it, SCCA Street class has rules about changing the OE offset, something small like +/-3 or 5mm is the maximum allowed. Since you mention aftermarket suspension though I don't think STX and above has any rules about changing offset.

Thanks. That's exactly what I was looking for.

[Spartarus]

Originally Posted by Leonardo

I can spin my 245 MPSS on a 18x9. Stock engine auto trans.

How many other frs/brz have you driven? What tire wheel did they have?

Haven't driven many twins. Mostly other cars. Couple of turbo FRS's, 1 eforce car, nothing bigger than 18x8. No tire bigger than 245.

The bigger tire setup did the power-slide job alright, but the car felt bigger, heavier... It liked to push more during forward weight transfer in a corner, needed power to rotate. It just didn't handle as well. I'll give you that the entry speeds were marginally faster, but it just didn't feel as spritely. It felt like a Mustang. Stock suspension, btw.

[strat61caster]

Originally Posted by Spartarus

Haven't driven many twins. Mostly other cars. Couple of turbo FRS's, 1 eforce car, nothing bigger than 18x8. No tire bigger than 245.

The bigger tire setup did the power-slide job alright, but the car felt bigger, heavier... It liked to push more during forward weight transfer in a corner, needed power to rotate. It just didn't handle as well. I'll give you that the entry speeds were marginally faster, but it just didn't feel as spritely. It felt like a Mustang. Stock suspension, btw.

Competitive STX autocross cars have no problem spinning the tires at launch or hanging the back end out on 17x9 245 sticky as fuck RE-71R's with just a header and tune. Hell I can do it on mine right now with a stock powertrain as I'm developing my setup and my car is just too loose.

Sticky 245's aren't a death sentence for fun. I totally understand not needing or wanting more tire though.

[Spartarus]

Originally Posted by strat61caster

Competitive STX autocross cars have no problem spinning the tires at launch or hanging the back end out on 17x9 245 sticky as fuck RE-71R's with just a header and tune. Hell I can do it on mine right now with a stock powertrain as I'm developing my setup and my car is just too loose.

Sticky 245's aren't a death sentence for fun. I totally understand not needing or wanting more tire though.

Well, that's interesting. I'm open-minded.

I'm nearly certain STX prohibits me from using forced induction, which would seriously suck, but I haven't read the appendix to find out if there are certain approved applications for the FRS.

[strat61caster]

Originally Posted by Spartarus

Well, that's interesting. I'm open-minded.

I'm nearly certain STX prohibits me from using forced induction, which would seriously suck, but I haven't read the appendix to find out if there are certain approved applications for the FRS.

That's correct, FI puts you into SM class, which is affectionately dubbed 'Spend Money' which you likely won't be competitive in. IMO just build what makes you happy and if you autocross/time trial go out there to have fun. If you want to win don't spend a cent until you know exactly what you want/need.

http://www.ft86club.com/forums/showthread.php?p=2192626

Some decent tire info for you in there as well.

But the point in the above post is that while you may not 'need' more tire, I'm willing to bet someone with experience could drive your car at 10/10ths, get out and the first words out of their mouth would be 'needs more grip' even at <250 whp levels with 215 street tires.

[Yoshoobaroo]

Originally Posted by Spartarus

It just didn't handle as well. I'll give you that the entry speeds were marginally faster, but it just didn't feel as spritely. It felt like a Mustang. Stock suspension, btw.

This is why I want to try RE-71R's in the stock 215 size. I want more grip, but not a ton, just enough to put the power down in corner exits without going all dorifto.



Okay maybe a little dorifto.. But less than it does now.
-Josh

[Spartarus]

Originally Posted by strat61caster

That's correct, FI puts you into SM class, which is affectionately dubbed 'Spend Money' which you likely won't be competitive in. IMO just build what makes you happy and if you autocross/time trial go out there to have fun. If you want to win don't spend a cent until you know exactly what you want/need.

http://www.ft86club.com/forums/showthread.php?p=2192626

Some decent tire info for you in there as well.

But the point in the above post is that while you may not 'need' more tire, I'm willing to bet someone with experience could drive your car at 10/10ths, get out and the first words out of their mouth would be 'needs more grip' even at <250 whp levels with 215 street tires.

That's awesome advice. I'm not out to win a whole bunch of races in this car...

I'm after a setup that I can push to 10/10ths everywhere... I have that right now, I'm just trying to make small improvements to address things I don't like, without ruining it. I'm good at that, but it involves lots of overthinking things.

For you motorcycle people, this is the SV650 of cars. I want to keep it that way.

[c4lvinnn]

Originally Posted by Spartarus

That's awesome advice. I'm not out to win a whole bunch of races in this car...

I'm after a setup that I can push to 10/10ths everywhere... I have that right now, I'm just trying to make small improvements to address things I don't like, without ruining it. I'm good at that, but it involves lots of overthinking things.

For you motorcycle people, this is the SV650 of cars. I want to keep it that way.

You're also good at overthinking things, lol.

And I have a SV650 too.

[Ultramaroon]

Originally Posted by Yoshoobaroo

Okay maybe a little dorifto.. But less than it does now.
-Josh

lol