Is anyone on here running 17x9.5 et30 looking for some pics of this setup if anyone has them?

Is anyone on here running 17x9.5 et30 looking for some pics of this setup if anyone has them?

 

That's practically my rears if you care to check out my profile, I have 245's on them currently.

They sit really nicely, what profile you running 40's, I was thinking of going for 255's

That's practically my rears if you care to check out my profile, I have 245's on them currently.

 

Is that on the rear ? 500hp how do you get any grip ?

You can't have a 9.5" rear wheel then? You'd have a lot of stretch if you did. I have 245 on the front of mine! lol

They sit really nicely, what profile you running 40's, I was thinking of going for 255's

 

They are 40's yes and I have posted on another thread that my new rubber on the rear will be 255's, I think they're 9J actually and my fronts are 8's which are going to have 225's, so no stretch for me and more grip.

Is that on the rear ? 500hp how do you get any grip ?

 

I've been thinking about this a lot recently, tire width and grip. It's not quite as simple as a wider tyre equals more grip. There's a point of deminising return, which relates to the weight applied to the contact patch. That's just straight lines, where corners are concerned it gets even more complex, weight transfer and flex can mean you actually achieve less grip! Yes confusing stuff, you may gain more grip from a correctly adjusted tyre pressure than simply going wider.

As far as I'm aware no one has ever tested a z32s optimal tyre size in any given situation. Certain 700hp super cars have rears over 12j and traction control etc, It also weighs more than a z32 so can exploit it more. What I'm trying to say is it's not clear cut, the old whack some uber wide rears on possibly not the best solution for us. I'm very much considering swapping to a 225/40/17r front and 245/40/17r rear as as a road legal slick, this should have more grip than a 265/35/18r I think, I'm not sure really.

I have big concerns ATM, over actually getting power on the floor. I'm not going to reveal much but grips an issue at stock power off the line let alone with more... How does your na rear end fair dave? Is it just a tyre spinning mess from standstill

I've been thinking about this a lot recently, tire width and grip. It's not quite as simple as a wider tyre equals more grip. There's a point of deminising return, which relates to the weight applied to the contact patch. That's just straight lines, where corners are concerned it gets even more complex, weight transfer and flex can mean you actually achieve less grip! Yes confusing stuff, you may gain more grip from a correctly adjusted tyre pressure than simply going wider.

As far as I'm aware no one has ever tested a z32s optimal tyre size in any given situation. Certain 700hp super cars have rears over 12j and traction control etc, It also weighs more than a z32 so can exploit it more. What I'm trying to say is it's not clear cut, the old whack some uber wide rears on possibly not the best solution for us. I'm very much considering swapping to a 225/40/17r front and 245/40/17r rear as as a road legal slick, this should have more grip than a 265/35/18r I think, I'm not sure really.

I have big concerns ATM, over actually getting power on the floor. I'm not going to reveal much but grips an issue at stock power off the line let alone with more... How does your na rear end fair dave? Is it just a tyre spinning mess from standstill

 

remember to build into your calculations that 450 plus ponies and too much grip on a bog drivetrain can start delivering snapped driveshafts and ripped tension arms ect...i see rear wheelspin on public roads as a safety clutch:D

Apparently it's about 600 ponies that is the passing point on snapping driveshafts. On drag radials and more than 600 expect to snap tt ones regularly. :(

I know what you mean about a safety clutch lol, but it slows you down and or helps you to climb trees.

One of my friends shattered his drive shafts when I was out at Branson Z Fest in Missouri earlier in the year. He's running around 750hp.

Just my "two cents" and a bit of comparison. I ran a S/C'd Monaro LS2 with about 580-600 bhp on 265 rears for about 2 years and rear grip was perfectly acceptable in the wet and the dry. Of course, you did need to be much more careful when it was damp but that goes for Zeds too. The 'Ro was comparable weight-wise to a Zed; probably about 100kg or so heavier. I remember the general consensus was that you didn't need to go to 285 (which involved expensive tubbing) until you were either pushing 650+ bhp (which a fair few of them were) or you were fully committed to track day use of the car

My zed already has 265 rears, not cheap crap either, a set of pzero Rosso's and I can honestly say that dry traction is acceptable. It's not great, even at stock power. I can spin up shifting into third in the dry if I'm not carefull.

My zed already has 265 rears, not cheap crap either, a set of pzero Rosso's and I can honestly say that dry traction is acceptable. It's not great, even at stock power. I can spin up shifting into third in the dry if I'm not carefull.

 

Where are you driving? On a beach lol! I have 265 kuhmos middle of the price range tyres and it spins in first and second.

 

I was wondering if there is a fairly subtle softening to the power delivery through my stressed out not brilliant clutch. It doesn't slip but would a paddle clutch make in gear acceleration come on harder?