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Im going to put 305 30 19 on the rcf in 2 month. Local tire shops say as long I stay stock height it shouldn't rub, as 305/30 in a little shorter height wise than 275/35
OK. 265/30/ZR20. You still increased the front to rear stagger and added camber in the rear. That doubly adds to push, not subtracts. Since the factory does everything in their power to make the car push, this will not be a mechanical performance modification, it will be a visual performance modification. Don't expect faster laps than a stock GSF on a track weekend, you'll be very disappointed.
Last edited by lobuxracer; Dec 15, 2016 at 08:11 PM.
You'll be shocked to know that the rear camber with this setup isn't far from OEM factory specs
Originally Posted by lobuxracer
OK. 265/30/ZR20. You still increased the front to rear stagger and added camber in the rear. That doubly adds to push, not subtracts. Since the factory does everything in their power to make the car push, this will not be a mechanical performance modification.
Right, but the factory spec promotes understeer along with 10 other things Lexus does to ensure understeer from the showroom floor. Anything adding to this, even in a small amount only exacerbates what the factory did. I've done enough chassis tuning over the years on a number of platforms, and all I can say is, the results of these modifications will make the car more prone to understeer than what the factory did, and they were very conservative in ensuring understeer because Ralph Nader, a man who has never owned a car at all, screwed all of us who prefer mechanical performance way back in the 60's.
My big question is, do we have enough room to fit a 295 in the front? If we do, that will generate a massive increase in mid-corner speed.
Last edited by lobuxracer; Dec 15, 2016 at 08:34 PM.
OK. 265/30/ZR20. You still increased the front to rear stagger and added camber in the rear. That doubly adds to push, not subtracts. Since the factory does everything in their power to make the car push, this will not be a mechanical performance modification, it will be a visual performance modification. Don't expect faster laps than a stock GSF on a track weekend, you'll be very disappointed.
Lance
Maybe I'm misunderstanding. But in stock guise (255/30/19 (25.1" OD) & 275/35/19 (26.6" OD) the front to rear stagger is 1.5". 265/30/20 has an OD of 26.3" & 305/30/20 has an OD of 27.2". The new front to rear stagger is .9". Doesn't that mean the OP lessened the stagger? Not sure how having the front OD over 1" larger will affect the handling and electronics though.
And with all this talk about the PSS being so much wider than other tires size for size. I just went out to the garage and tried to match the rear tire shot that the OP took. My rears are Bridgestone S-04 295/30/19. So they should be quite a bit narrower than the PSS 305/30/20 of the OPs. No measurement here, but just visually, I'm not seeing a lot of difference.
Maybe I'm misunderstanding. But in stock guise (255/30/19 (25.1" OD) & 275/35/19 (26.6" OD) the front to rear stagger is 1.5". 265/30/20 has an OD of 26.3" & 305/30/20 has an OD of 27.2". The new front to rear stagger is .9". Doesn't that mean the OP lessened the stagger? Not sure how having the front OD over 1" larger will affect the handling and electronics though.
Lou
Lou - not OD, but width. L/R stagger is OD, F/R stagger is width. OEM is 255/275 F/R. 265/305 F/R is +10mm F and +30mm R. So what was 20mm stock is now 40mm. There's no way this is good for mid-corner speed.
"UPDATED w/Pictures" Who Said We Can't Run 305/30/20 PSS
