IS350 square setup
#31
Lexus Champion
iTrader: (1)
I have 245/40/18 Michelin Super Sports on the front of my 07 IS350 & 255/40/18 on the rear. Stock suspension & X-pac wheels. With more than 1 person in the car front tires rubs slightly with steering turned full lock to the side. Currently installing oe sport springs & F-sport shocks. I will let you know if this changes clearance.
#32
sorry to revive an old thread but would there be problem running a one inch shorter tire at the back with the 255/35/18 setup?
255/35/18 diameter is 25" while stock 255/40/18 is 26" diameter
255/35/18 diameter is 25" while stock 255/40/18 is 26" diameter
#33
Previously I would have said that would be no problem at all, and on an IS250 it wouldn't be, but ever since switching to an IS350, the traction control is much more sensitive to tire size variations! I am currently running a square setup on mine and it takes very little to get traction control to engage (it's seeing almost 4% slip at all times, so pushing it past that is very easy). The RWD IS250 on the other hand came with a square or a staggered setup, and it appears that the programming was very lax because of that. I had a square setup (245/40R17) for years on my IS250 setup.
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Jeff
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Jeff
#34
Lead Lap
iTrader: (2)
Time to step up the tire sizes for the tree-fiddy then! Like you I run 17" wheels, my tires now are 245/40 on the front and 265/40 on the back. Seems to be close enough to stock diameters that I don't have an issue with traction control. I plan on stepping up to 255/40 and 275/40 next spring, we'll see how that goes.
#37
I'm running RE11A's, yeah. The RE71R is also available now, though I have been considering going to something a bit more street and less track such as the RE760 or Pilot Super Sport. It's up in the air, lol. The ZII Star Spec is also available in the sizes I am looking at.
Jeff
Jeff
#38
Lead Lap
iTrader: (2)
Back when I had the 245/40 and 245/45 combo I had Pilot Stupid Sports. Great tires for what they are, despite my making fun of them. I would love to put RE71s, Star Specs, or Rivals on my car, but even with 17" rims they are going to be HARSH, even compared to the RE11s. My wife wouldn't appreciate that move.
#40
Previously I would have said that would be no problem at all, and on an IS250 it wouldn't be, but ever since switching to an IS350, the traction control is much more sensitive to tire size variations! I am currently running a square setup on mine and it takes very little to get traction control to engage (it's seeing almost 4% slip at all times, so pushing it past that is very easy). The RWD IS250 on the other hand came with a square or a staggered setup, and it appears that the programming was very lax because of that. I had a square setup (245/40R17) for years on my IS250 setup.
:\
Jeff
:\
Jeff
#42
Back when I had the 245/40 and 245/45 combo I had Pilot Stupid Sports. Great tires for what they are, despite my making fun of them. I would love to put RE71s, Star Specs, or Rivals on my car, but even with 17" rims they are going to be HARSH, even compared to the RE11s. My wife wouldn't appreciate that move.
Jeff
#43
Lead Lap
iTrader: (2)
Following up on this, it actually looks like the 245/40 and 245/45 combination is actually a larger difference F/R than stock. Did you have any issues at all with this setup and traction control/VDIM? In theory it would cause the traction control to kick in slower than stock, but I don't want to regret buying them, haha.
Jeff
Jeff
#45
In this case if I don't want it completely off, will it help if I get a isf steering ecu and use the isf sport vdim setting so it would kick in later?