275 tires and 18x11 vs 18x10 wheel fitment on stock shocks

[Subydude]

Oh hey a fellow Pitt Race enjoyer. That was my home track until last year (RIP). Turn 5 can definitely be hard to put power down. With my setup (275/40 CRS on an 18x10.7 titan7, stock power, FA510s) I can pretty consistently mash the throttle and climb out of the Gulch. That is until maybe 4 or 5 events in. Then I have to juuuuust a tiny bit but then get back in it.

I was also quite sad to see Pitt Race go. One of my favorite tracks so far and easily worth the 9 hour tow for me were it still there.

I think I figured out part of the issue of why the car was more tail happy there. The rear toe had slipped some. When I reset it and then swapped to the 275/40/18 Yok for VIR it was much more stable in terms of laying on throttle. Still had to be somewhat prudent, but much much better.

I just mounted and balanced the 275/295 setup this past weekend. Next track day at VIR is the 14th so I'll compare the square 275 to staggered 275/295. Not a super fair comparison since the yoks are getting close to their prime and the new RZ's are full tread depth, but I did at least have the RZ's heat cycled to start.

The car is also tuned now which I imagine will add to some on throttle rotation in lower speed corners.

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[i3igpete]

I used a 5 lb solid sledge, didnt take more than 5 whacks per side. Honestly the deadblow part might be hurting you more than helping

 

[Subydude]

I haven't removed the spring perch specifically, but I have done a lot of similar things. Definitely use a real hammer, and work your way around like others have said. If you can't reach the back to impart similar force then see if you have something that can act like an extension (pry bar, long socket extension, etc) and use it to tap up on the back.

I bet working your way around with a bigger hammer will get it out.

 

[Shift9303]

Lol, the spring perch came off with three good wacks of the mallet after I finally got the knuckle spreader in and took the shock off the car. Couldn't get good leverage on the sweet spot with the shock still on the car because the brake caliper was in the way. Hopefully I didn't bugger the shock with hitting it too hard and everything goes well after this.

 

[604.Supra]

I run an 18x10.5 +35 and 275/35/18 or 275/40/18 on my car. With a 15mm spacer it makes my effective offset +20 and doesn't rub inbound or outbound lowered on H&R springs with -3.4 camber up front. An 11 would likely rub as Bryan mentioned and would definitely require changes to the spring perch.

There are 10.5" wide options out there, or 10.7" if you go with Titan7 stuff. Those make life a good bit easier as it's just enough to not rub. They also support the 275 better.

Speaking of square setups, I've only worn out one set of tires on the Supra this year but I think staggering them with a 275/295 on 10.5/11.5 wheels will be faster. Square allows you to rotate for longer wear, but I'd be happy to trade that option for the ability to put power down better mid-corner. Once you go coilover or change the perch up front then all bets are off and it's back to the drawing board for what size wheels/tires to run.

Do you know if the 18x10.5 et35 will fit on completely stock suspension? looking at those or either 18x10 et30 (which i know fits on stock suspension). thanks. will be running 275/40/18 CRS tires on stock suspension and camber plates.

 

[604.Supra]

Here is a 275 CRS and 71RS on the same exact spec titan wheels you ordered, peep the fitment. This isn't brain surgery, just get the 275 and enjoy your track weekends.

Do these titan wheels and 275/40/18 CRS fit on stock suspension cars with camber plates? Or will i need different springs/coilovers that are narrower?

 

[Subydude]

Do you know if the 18x10.5 et35 will fit on completely stock suspension? looking at those or either 18x10 et30 (which i know fits on stock suspension). thanks. will be running 275/40/18 CRS tires on stock suspension and camber plates.

With a 10mm-15mm spacer up front, yes. It'll fit without a spacer in the rear, but I use a 12mm spacer out back to bring the wheel flush.

On a 275/40/18 you'll want the 10mm spacer. If you use a 275/35/18 you can get away with a 15mm spacer (that's where my range came from).

Buy the cheap spacers off Amazon or wherever so it's not as much of a hit when you want 3 different widths.

 

[604.Supra]

With a 10mm-15mm spacer up front, yes. It'll fit without a spacer in the rear, but I use a 12mm spacer out back to bring the wheel flush.

On a 275/40/18 you'll want the 10mm spacer. If you use a 275/35/18 you can get away with a 15mm spacer (that's where my range came from).

Buy the cheap spacers off Amazon or wherever so it's not as much of a hit when you want 3 different widths.

Thank you for confirming. This opens up alot more wheel possibilities especially up here in canada.

 

[tracer bullet]

Seems like ET25's in the neighborhood of perfect for the front (Supra and Z4 both, unsurprisingly). Maybe 30-ish in the rear. But you can vary either way some if you don't max out the tire width to the absolute fullest. Also you can get wheels a little more tucked in (ET35 for example) and space them out further to lower ET#'s like 25 if you have a 10mm spacer. You might know this but FYI if not.

Mind the bolts, if you add a 10mm spacer you'll want roughly 10mm longer bolts as well. A little shorter might still be enough, a little longer should still clear the internals past the hub (5-10mm at least when i measured on the Z4), but if you go 1:1 additional bolt length to spacer width you'll definitely be OK.

 

[razorlab]

ET40 18x11 with 295's also fit perfect in the rear. I have been running that for years.

 

[Mad0zodi]

@Shift9303 - When you say roval, are you talking about WWT fka Gateway?

 

[604.Supra]

ET40 18x11 with 295's also fit perfect in the rear. I have been running that for years.

What would you choose between 18x10.5 et35, or 18x10 et30 if using 275/40/18 CRS tires on stock suspension?

 

[Shift9303]

@Shift9303 - When you say roval, are you talking about WWT fka Gateway?

Yes, I was referring to WWT/Gateway. It looked pretty uninteresting to me at first but I was surprised and actually enjoy it quite a bit. It flows well for a roval and short laps mean you get a lot of repetition for practice. Even in my S2000 the straights don't feel too long and I can carry a lot of speed in the oval bank. I call it "Tsukuba at home." Only down side is that it destroys your passenger rear tire so you need to rotate at the track for even wear. I've never ran Kansas Speedway and TBH the infield looks much less interesting and I've heard bad things about the road surface.

 

[Subydude]

Yes, I was referring to WWT/Gateway. It looked pretty uninteresting to me at first but I was surprised and actually enjoy it quite a bit. It flows well for a roval and short laps mean you get a lot of repetition for practice. Even in my S2000 the straights don't feel too long and I can carry a lot of speed in the oval bank. I call it "Tsukuba at home." Only down side is that it destroys your passenger rear tire so you need to rotate at the track for even wear. I've never ran Kansas Speedway and TBH the infield looks much less interesting and I've heard bad things about the road surface.

I got to drive WWT last year during One Lap, and was also happily surprised at how fun it was. I've driven Charlotte Motor Speedway and Nashville Super Speedway so I wasn't expecting it to be as fun as those, but I think I'd at least rate WWT as good as NSS, if not slightly better.

 

[razorlab]

What would you choose between 18x10.5 et35, or 18x10 et30 if using 275/40/18 CRS tires on stock suspension?

Rear fitment doesn't really change OEM suspension vs coilovers. Front is what changes because of the perch. I'm not an expert on OEM suspension front fitment so I would ask others here.

As far as what wheel width the 275/40 CRS would feel better on, 10.5 all day.

Here are some images back when I used 275/40 CRS on 10.5's:

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