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Old 10-29-2020, 05:14 PM   #15
Ummpwr
 
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Cool,I do have the silverado extended studs.

What studs will fit the Camaro front and be long enough to use 30mm spacers?? Any part numbers?
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Old 10-29-2020, 07:57 PM   #16
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Cool,I do have the silverado extended studs.

What studs will fit the Camaro front and be long enough to use 30mm spacers?? Any part numbers?
ARP 100-7737 are ~25mm longer but I still wouldn’t run with 30mm spacers as you’d still only have 9-10mm engagement.
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Old 10-30-2020, 07:54 AM   #17
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Yes I was looking at those arp studs that are 1in longer than stock and your right they are advertised as being able to handle 25mm spacers.

Updated with ramp pics, on first post

Eric
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Old 10-30-2020, 08:09 AM   #18
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I agree, I don't like the "poke" look but because of the offsets being for a c7 corvette I needed all of the spacers. I only have a few mm clearance to the front struts.(I know best would be camber plates)
How many mm is "only a few"?

I really, really, REALLY hope you didn't torque any of those 12mm lug nuts down to 140 ft*lbs.


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Old 10-30-2020, 11:09 AM   #19
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I probably have 3-4mm of clearance from the inside tire to strut.

My rear spacers with studs are 14x1.5 so I did 140lb tq on all the rear.

With the front spacers have 12x1.5 studs so I did 120lbs but I'm thinking of backing them down to 100lbs. What do you think ?

Here is a diagram I got from tire rack. Although based on this 140 lbs is over tqed for our 14x1.5???

Eric
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Old 10-30-2020, 12:25 PM   #20
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With the front spacers have 12x1.5 studs so I did 120lbs but I'm thinking of backing them down to 100lbs. What do you think ?
I think there is a reason that GM specified 14mm studs for Camaros, and Ford does the same for Mustangs. These are heavy cars capably of generating serious acceleration forces in all directions, and the 14mm studs allow a higher clamping force which is important to get the proper friction between the wheel and hub face.

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Here is a diagram I got from tire rack. Although based on this 140 lbs is over tqed for our 14x1.5???
That diagram is all kinds of jacked up. 14mm and 9/16" are practically the same size but they are calling for wildly different torque values there (and no pitch spec on the 9/16" values). Again, all the vehicles that I've seen with 14mm studs specify 130-150lb/ft of torque.
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Old 10-30-2020, 01:47 PM   #21
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I think there is a reason that GM specified 14mm studs for Camaros, and Ford does the same for Mustangs. These are heavy cars capably of generating serious acceleration forces in all directions, and the 14mm studs allow a higher clamping force which is important to get the proper friction between the wheel and hub face.


That diagram is all kinds of jacked up. 14mm and 9/16" are practically the same size but they are calling for wildly different torque values there (and no pitch spec on the 9/16" values). Again, all the vehicles that I've seen with 14mm studs specify 130-150lb/ft of torque.
Agreed. Stick with 14mm studs if at all possible. If you absolutely have to run 12mm, keep a very close eye on them and change them out every year or two to avoid shearing. I've seen similar weight cars with less power and lat capability shear 12mm studs and lose a wheel on track and they were only 4 year old studs and were always meticulously torqued and maintained.

I'd also agree, that table is kinda useless. In addition to what's already been said, grade plays a big role in torque capabilities and isn't even mentioned. Number of turns is also odd. Typically 3 threads minimum is the general guideline (about 75% of the total load in fasteners with more than 6 threads), but 99.99% of the time the first 6 threads will carry 100% of the load. Some race teams definitely use less than 6 threads/turns on their wheel fasteners, and I'd even imagine some OE's use less than that. I've even ran my own car with 3 threads engaged on the front wheel lugs for a couple of track days and they were fine. Was personally sketched out by it and swapped to truck studs to get a few more threads engaged after 2 track days as I prefer safety to being cheap/lazy, but trying to get 8 to 9 is definitely overkill.
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Old 10-30-2020, 04:53 PM   #22
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I think there is a reason that GM specified 14mm studs for Camaros, and Ford does the same for Mustangs. These are heavy cars capably of generating serious acceleration forces in all directions, and the 14mm studs allow a higher clamping force which is important to get the proper friction between the wheel and hub face.


That diagram is all kinds of jacked up. 14mm and 9/16" are practically the same size but they are calling for wildly different torque values there (and no pitch spec on the 9/16" values). Again, all the vehicles that I've seen with 14mm studs specify 130-150lb/ft of torque.

Yeah there not calling out the thread pitch which makes a differance in torque values.
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Old 10-31-2020, 09:20 PM   #23
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After the autox everything was great with tire fitment, no rubbing anywhere. No spacer issues. They definitely handled well and much more grip laterally and much more forward acceleration grip compared to my BS set up (19x10 w/ 305/30/19 supercar 3 & 19x11 w/ 325/30/19 supercar 3)

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Old 11-01-2020, 10:32 AM   #24
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Originally Posted by Ummpwr View Post
I probably have 3-4mm of clearance from the inside tire to strut.

My rear spacers with studs are 14x1.5 so I did 140lb tq on all the rear.

With the front spacers have 12x1.5 studs so I did 120lbs but I'm thinking of backing them down to 100lbs. What do you think ?

Here is a diagram I got from tire rack. Although based on this 140 lbs is over tqed for our 14x1.5???

Eric
I wouldn't trust that table as far as I could throw it . . .

I have three cars that use 12mm studs. Two of them call for 90 ft*lbs, and the Mustang calls for 100 ft*lbs.

I'm 99% sure that the driver side front lug nuts on the Mustang were torqued significantly past 100 ft*lbs once (pretty sure it wasn't by me). I don't know if they were run down to 25 more or 50 more, but I eventually lost the driver side front wheel in a 50 mph 1+g right-hand corner on the track. Could have been only 5 sessions on them after being overtorqued, could have been twice that many, I just don't know.


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Old 11-01-2020, 12:01 PM   #25
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CamC is a really cool class.
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Old 11-01-2020, 01:21 PM   #26
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I adjusted the front lug nuts (wheel to wheel spacers to 100flbs , they are the 12x1.5)

I am going to order front spacers with 14x1.5 studs in the near future

What are other mods that make good gains for CamC? DSC sport controller? Camber plates?



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Old 11-02-2020, 11:07 AM   #27
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Good to hear no rubbing, I'd still be concerned with a good apex curb clip and would like to know what it looks like at full compression. Clearly not an issue for autocross or street besides paint chips haha.
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Old 11-02-2020, 11:32 AM   #28
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Right, it is a autox set up for now, so no curbs if things go to plan on the autox course.
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