Who's making the move to STU?

Evildky · 01-04-2021, 04:09 PM

Quote:

Originally Posted by ConekillerZ34

What's goofy about the offsets? I slapped on the same set of 18x10.5s from my Z33 after I switched cars. One and done! Got 4 lovely pandemic events in time to need something else 🤣

The OE wheels on my nismo are 19x9.5 +40, the rears are 19x10.5 +23. As opposed to my 350Z (GT) 18x9 +30 and 19x10 +30. I ran my 18x10+23's up front on the 370, they fit due to the smaller diameter of the tire but stuck out from the body a bit. My 10.5 +15's would have been worse up front but fit pretty well out back.

Zewerr · 02-07-2021, 01:20 AM

So, I'm trying to decide on a good 18x11 option. The waaaay cheaper option, but still a good quality lightweight wheel is the Konig Hypergram, but I'm worried about a +15 offset. Many of you here are saying this should be fine, but math shows that these will stick out 14 mm further than my 19x10.5 +23 that I'm coming from which fit perfectly flush on the front with -3.2 degrees of camber. It would seem that running around a +25 would be best. Wheels available there would essentially double or triple the price over the Konigs, though. Anyone have good picts of 11's at around a +15?

Hotrodz · 02-07-2021, 09:45 AM

Quote:

Originally Posted by Zewerr

So, I'm trying to decide on a good 18x11 option. The waaaay cheaper option, but still a good quality lightweight wheel is the Konig Hypergram, but I'm worried about a +15 offset. Many of you here are saying this should be fine, but math shows that these will stick out 14 mm further than my 19x10.5 +23 that I'm coming from which fit perfectly flush on the front with -3.2 degrees of camber. It would seem that running around a +25 would be best. Wheels available there would essentially double or triple the price over the Konigs, though. Anyone have good picts of 11's at around a +15?

There may not be enough back spacing to run a +22. I run +18 and it is really close.

Sent from my SM-G965U using Tapatalk

Zewerr · 02-07-2021, 07:24 PM

Quote:

Originally Posted by Hotrodz

There may not be enough back spacing to run a +22. I run +18 and it is really close.

Sent from my SM-G965U using Tapatalk

Is it the steering knuckle I have to worry about? Currently, I have about 3/4" of clearance, I'm estimating. Going down an inch in diameter will move the wheel slightly closer to the knuckle. I'm guessing it'll give me another 1/2" to work with. Total guesses, though, without actually measuring.

ConekillerZ34 · 02-17-2021, 11:05 PM

I think I'll be taking a bit of a plunge on behalf of the current thread topic. Looks like I'll be picking up a set of 18x11 square Forgestar F14s (or Gramlight 57T, haven't decided yet).

Probably going with a 18x11 +25 all the way around, with a few different sets of spacers to give me options. Per the math, I need +21 to match my current fitment and would expect that to give me about 7.5mm clearance inside at the narrowest point to the arm, depending on how the 315 tire itself sits out from the lip. That's based on a rough measurement, so I'm trying not to get down to the millimeter on the inside.

I figure if a spacer is necessary, with a 5mm spacer I'll be only millimeter off of my current setup in the front, and even with the extra tire meet it won't be looking like a formula car. If I have to run even more spacer, well I'm already rocking #44 so maybe it'll just be another silver Mercedes.

On the rear it's obviously not as much of a concern, and 10-15mm of spacer will probably get the aesthetics handled.

Fingers crossed. I've been talking to Brendan, but if anyone else has measurements that make me crazy, speak now or forever hold your peace.

Wigjiggy · 02-07-2021, 04:06 PM

Quote:

Originally Posted by Zewerr

So, I'm trying to decide on a good 18x11 option. The waaaay cheaper option, but still a good quality lightweight wheel is the Konig Hypergram, but I'm worried about a +15 offset. Many of you here are saying this should be fine, but math shows that these will stick out 14 mm further than my 19x10.5 +23 that I'm coming from which fit perfectly flush on the front with -3.2 degrees of camber. It would seem that running around a +25 would be best. Wheels available there would essentially double or triple the price over the Konigs, though. Anyone have good picts of 11's at around a +15?

Don’t know if this is helpful. But this is a pic showing flush at the top with -3% camber. Theses are:
Enkei NT03-M 18x10.5 +30mm offset (relatively cheap)
With 295/30/18 Toyo RR‘s
And 5mm spacer

Zewerr · 02-21-2021, 12:19 AM

Good luck, man. I was planning on popping a front wheel off tomorrow and throwing one of my new 315s under there with a rather cheap *** fitment jig I borrowed. I'm hoping it'll at least get me close.

ConekillerZ34 · 02-23-2021, 05:08 PM

Quote:

Originally Posted by Zewerr

Good luck, man. I was planning on popping a front wheel off tomorrow and throwing one of my new 315s under there with a rather cheap *** fitment jig I borrowed. I'm hoping it'll at least get me close.

I didn't take the time to set up a jig or anything, but I actually created a rough mold of the negative space by making some putty in the kitchen and then jamming it between the wheel and arm. I found I had 21-23mm of space depending on whether I measured at the edge of the wheel lip or at the edge of the tire. The space for the tire gets easier as you go up.

So I went ahead and ordered Forgestars with a +22 offset, which will put me 0.65mm inset of my current setup on the outer edge, and 13.35mm inset on the inner edge. That's the wheel of course, and the 315 tire will be a bit puffier so I'm hoping it doesn't take up more than 7mm of the space inside. I can use a 2.5 or 5mm spacer from Z1 to fix that right up if it does, and I'll use a 5 or 10mm spacer in the rear anyway. Will obviously update everyone with they arrive in hopefully 2mo or less...

TL;DR: YOLO hope these things fit

Zewerr · 02-24-2021, 01:49 AM

I couldn't trust the measuring I did on Sunday. I do have access to a legit professional fitment tool. But I would need to drive to Portland to get it which is a 4 hour round trip. I may consider it this weekend.

Zewerr · 02-27-2021, 06:25 PM

Quote:

Originally Posted by ConekillerZ34

So I went ahead and ordered Forgestars with a +22 offset,

I think you might be in the sweet spot with the +22. I got hold of the fitment tool and set it to +25 and it appears the tire would be rubbing against the spindle just a little. +22 seems to give it a mm or two of clearance. The tool still probably isn't perfect, but it seems to give me a good idea. Now, should I take the plunge and pull the trigger on some wheels, trusting my results?

ConekillerZ34 · 03-07-2021, 12:09 PM

Quote:

Originally Posted by Zewerr

I think you might be in the sweet spot with the +22. I got hold of the fitment tool and set it to +25 and it appears the tire would be rubbing against the spindle just a little. +22 seems to give it a mm or two of clearance. The tool still probably isn't perfect, but it seems to give me a good idea. Now, should I take the plunge and pull the trigger on some wheels, trusting my results?

Go for it! I thought the same thing based on measurements. My calculations suggested +24 would work, but with some uncertainty on the widest part of the tire -- so I figured if I'm going to potentially need spacers either way, I started at 22. I also have the Nismo flares so that helps (though only visually) with any poke.

Brendan · 02-28-2021, 05:03 PM

Do it

Brendan · 03-03-2021, 07:50 PM

I was wrong about the fender rule. It doesn't say anywhere that you have to fit the tire under the fender. That should open up some options for 18x11. I mounted 315 on my current wheels today pretty easily. No rubbing and due to the shorter height, a little bit better clearance. I'll take some pics this weekend if I can get the prep on the car done in time

Here's some of the tires mounted
315 on 18x10.5
https://photos.app.goo.gl/QU9b3DN8rLGgWyox7

Brendan · 03-06-2021, 07:02 PM

Finally got it to rub. I'm currently at -3 degrees of camber and my height is at 26.5 inches. I think I can raise the car another half inch and make it work. The rub happened going over a pretty huge dip in the road at speed and the witness marks are pretty minimal, so I'm hoping a little extra height will get me there.

Zewerr · 03-06-2021, 10:33 PM

Can we get some picts of them mounted on the car?

02-17-2021, 11:05 PM	#5 (permalink)
ConekillerZ34 Base Member Join Date: Jan 2020 Location: DC Posts: 26 Drives: 2016 370Z Nismo Tech Rep Power: 11	I think I'll be taking a bit of a plunge on behalf of the current thread topic. Looks like I'll be picking up a set of 18x11 square Forgestar F14s (or Gramlight 57T, haven't decided yet). Probably going with a 18x11 +25 all the way around, with a few different sets of spacers to give me options. Per the math, I need +21 to match my current fitment and would expect that to give me about 7.5mm clearance inside at the narrowest point to the arm, depending on how the 315 tire itself sits out from the lip. That's based on a rough measurement, so I'm trying not to get down to the millimeter on the inside. I figure if a spacer is necessary, with a 5mm spacer I'll be only millimeter off of my current setup in the front, and even with the extra tire meet it won't be looking like a formula car. If I have to run even more spacer, well I'm already rocking #44 so maybe it'll just be another silver Mercedes. On the rear it's obviously not as much of a concern, and 10-15mm of spacer will probably get the aesthetics handled. Fingers crossed. I've been talking to Brendan, but if anyone else has measurements that make me crazy, speak now or forever hold your peace. __________________ 2016 Nismo 370Z \| SCCA STU Autocross Build WIP 2015 GT-R Black Edition \| Sold 2006 350Z SCCA STU prepped \| Sold

03-03-2021, 07:50 PM	#13 (permalink)
Brendan Track Member Join Date: Apr 2013 Location: Colorado Posts: 646 Drives: Poor man's Porsche Rep Power: 544	I was wrong about the fender rule. It doesn't say anywhere that you have to fit the tire under the fender. That should open up some options for 18x11. I mounted 315 on my current wheels today pretty easily. No rubbing and due to the shorter height, a little bit better clearance. I'll take some pics this weekend if I can get the prep on the car done in time Here's some of the tires mounted 315 on 18x10.5 https://photos.app.goo.gl/QU9b3DN8rLGgWyox7 Last edited by Brendan; 03-03-2021 at 07:57 PM.

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02-07-2021, 01:20 AM	#2 (permalink)
Zewerr Base Member Join Date: Jan 2019 Location: Tacoma, WA Posts: 45 Drives: 11 370Z 82/182 STU Rep Power: 8	So, I'm trying to decide on a good 18x11 option. The waaaay cheaper option, but still a good quality lightweight wheel is the Konig Hypergram, but I'm worried about a +15 offset. Many of you here are saying this should be fine, but math shows that these will stick out 14 mm further than my 19x10.5 +23 that I'm coming from which fit perfectly flush on the front with -3.2 degrees of camber. It would seem that running around a +25 would be best. Wheels available there would essentially double or triple the price over the Konigs, though. Anyone have good picts of 11's at around a +15?

02-21-2021, 12:19 AM	#7 (permalink)
Zewerr Base Member Join Date: Jan 2019 Location: Tacoma, WA Posts: 45 Drives: 11 370Z 82/182 STU Rep Power: 8	Good luck, man. I was planning on popping a front wheel off tomorrow and throwing one of my new 315s under there with a rather cheap *** fitment jig I borrowed. I'm hoping it'll at least get me close.

02-24-2021, 01:49 AM	#9 (permalink)
Zewerr Base Member Join Date: Jan 2019 Location: Tacoma, WA Posts: 45 Drives: 11 370Z 82/182 STU Rep Power: 8	I couldn't trust the measuring I did on Sunday. I do have access to a legit professional fitment tool. But I would need to drive to Portland to get it which is a 4 hour round trip. I may consider it this weekend.

02-28-2021, 05:03 PM	#12 (permalink)
Brendan Track Member Join Date: Apr 2013 Location: Colorado Posts: 646 Drives: Poor man's Porsche Rep Power: 544	Do it

03-06-2021, 07:02 PM	#14 (permalink)
Brendan Track Member Join Date: Apr 2013 Location: Colorado Posts: 646 Drives: Poor man's Porsche Rep Power: 544	Finally got it to rub. I'm currently at -3 degrees of camber and my height is at 26.5 inches. I think I can raise the car another half inch and make it work. The rub happened going over a pretty huge dip in the road at speed and the witness marks are pretty minimal, so I'm hoping a little extra height will get me there.

03-06-2021, 10:33 PM	#15 (permalink)
Zewerr Base Member Join Date: Jan 2019 Location: Tacoma, WA Posts: 45 Drives: 11 370Z 82/182 STU Rep Power: 8	Can we get some picts of them mounted on the car?