Broken subframe stud, how to fix? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

DriftDamage · 04-06-2015, 08:55 PM

As I removed my subframe one of the studs broke off to where there's no more thread available. I was thinking maybe cutting it off of a donor car and welding the whole thing into place but according to the ProAm rule book this wouldn't be allowed.

"8.3.2.4. All original suspension mounting tabs must remain in the original position. NO cutting, welding, bending, drilling or modifications of any kind will be allowed."

So how can I fix this problem without having to buy another shell and stay within compliance of the rulebook??
Also how would I even get the stud because I can't seem find a replacement to purchase anywhere online.

Any help or links to write ups would be great. :/

Corbic · 04-06-2015, 09:02 PM

http://zilvia.net/f/showthread.php?t=412638

Cut and Weld.

As for rules... the answer is already there - " tabs must remain in the original position".

You are not modifying, you are repairing. Additionally, I doubt anyone would notice.

DriftDamage · 04-06-2015, 09:14 PM

Wow on that last page that guy did an amazing repair. I doubt I know anyone with that kind of skill around here but I guess I will simply have to try to cut it out of a donor car and hope for the best of it being allowed.

DriftDamage · 04-06-2015, 09:32 PM

I just got a response from someone that does inspections and apparently you're right, repairs are allowed as long as everything remains in it's factory position and no modifications are made beyond the repair.

Corbic · 04-07-2015, 05:58 AM

Quote:

Originally Posted by DriftDamage

I just got a response from someone that does inspections and apparently you're right, repairs are allowed as long as everything remains in it's factory position and no modifications are made beyond the repair.

Told ya.

Also search Google this is a common problem. Some stuff on Zilvia from '06, '08 and '12. Some stuff on KA-T and 240sxforums.

Marsinosllc · 05-01-2015, 12:27 PM

If the stud is a rear one, cut the rear member out of a donor car, drill all the spot welds out, the drill all the spot welds out of your car and put the new member in and weld the holes..

Long process....

G-E@Z31P · 05-01-2015, 02:52 PM

Just thought I should mention this....

I make subframe swap kits for other chassis (pretty generic though) using hardened 4140 pins, using M20x1.5 thread, so you can use the R200 pinion locknuts on them for ridiculous strength.

IF you're worried about the strengths of the factory parts or the resultant weld, maybe these will be of use to you -- PM if you're interested in the just the pins without the other sleeves in the kit.

http://responsetype.com/shop/gazelle...me-swap-kit-1/

Thedriftbadger · 05-09-2015, 10:21 AM

You dont need another car to fix this lol. Find the location of the stud inside the car in the trunk area, cut a spot out of the floor pan. Hammer it up from the bottom of the car, they are installed like a wheel stud, with knurls at the top. Drop in an appropriately sized bolt, weld the head in place. Reinstall subframe, weld the piece of floor pan back in. Done.
Lift the car as high as you can and preferably at an angle so you can get as much force with as big a hammer as possible because those fuckers are seriously in there.

DriftDamage · 05-11-2015, 12:32 PM

Quote:

Originally Posted by Thedriftbadger

You dont need another car to fix this lol. Find the location of the stud inside the car in the trunk area, cut a spot out of the floor pan. Hammer it up from the bottom of the car, they are installed like a wheel stud, with knurls at the top. Drop in an appropriately sized bolt, weld the head in place. Reinstall subframe, weld the piece of floor pan back in. Done.
Lift the car as high as you can and preferably at an angle so you can get as much force with as big a hammer as possible because those fuckers are seriously in there.

This seems like the best idea but the hardest to execute without enough space to properly beat the shit out of the stud lol

G-E@Z31P · 05-11-2015, 04:40 PM

I'm sure they are tack welded in place as well, not merely pressed in like a wheel stud.

04-06-2015, 08:55 PM	#1
DriftDamage Leaky Injector Join Date: Jun 2008 Location: El Paso, Tx Age: 39 Posts: 65 Trader Rating: (1) Feedback Score: 1 reviews	Broken subframe stud, how to fix? As I removed my subframe one of the studs broke off to where there's no more thread available. I was thinking maybe cutting it off of a donor car and welding the whole thing into place but according to the ProAm rule book this wouldn't be allowed. "8.3.2.4. All original suspension mounting tabs must remain in the original position. NO cutting, welding, bending, drilling or modifications of any kind will be allowed." So how can I fix this problem without having to buy another shell and stay within compliance of the rulebook?? Also how would I even get the stud because I can't seem find a replacement to purchase anywhere online. Any help or links to write ups would be great. :/

05-01-2015, 02:52 PM	#7
G-E@Z31P Leaky Injector Join Date: Sep 2012 Location: Toronto Posts: 126 Trader Rating: (0) Feedback Score: 0 reviews	Just thought I should mention this.... I make subframe swap kits for other chassis (pretty generic though) using hardened 4140 pins, using M20x1.5 thread, so you can use the R200 pinion locknuts on them for ridiculous strength. IF you're worried about the strengths of the factory parts or the resultant weld, maybe these will be of use to you -- PM if you're interested in the just the pins without the other sleeves in the kit. http://responsetype.com/shop/gazelle...me-swap-kit-1/ __________________

05-11-2015, 04:40 PM	#10
G-E@Z31P Leaky Injector Join Date: Sep 2012 Location: Toronto Posts: 126 Trader Rating: (0) Feedback Score: 0 reviews	I'm sure they are tack welded in place as well, not merely pressed in like a wheel stud. __________________

04-06-2015, 09:02 PM	#2
Corbic Post Whore! Join Date: Jul 2005 Location: US Age: 40 Posts: 8,225 Trader Rating: (8) Feedback Score: 8 reviews	http://zilvia.net/f/showthread.php?t=412638 Cut and Weld. As for rules... the answer is already there - " tabs must remain in the original position". You are not modifying, you are repairing. Additionally, I doubt anyone would notice.

04-06-2015, 09:14 PM	#3
DriftDamage Leaky Injector Join Date: Jun 2008 Location: El Paso, Tx Age: 39 Posts: 65 Trader Rating: (1) Feedback Score: 1 reviews	Wow on that last page that guy did an amazing repair. I doubt I know anyone with that kind of skill around here but I guess I will simply have to try to cut it out of a donor car and hope for the best of it being allowed.

04-06-2015, 09:32 PM	#4
DriftDamage Leaky Injector Join Date: Jun 2008 Location: El Paso, Tx Age: 39 Posts: 65 Trader Rating: (1) Feedback Score: 1 reviews	I just got a response from someone that does inspections and apparently you're right, repairs are allowed as long as everything remains in it's factory position and no modifications are made beyond the repair.

05-01-2015, 12:27 PM	#6
Marsinosllc Leaky Injector Join Date: Dec 2009 Location: OHIO/Michigan Posts: 130 Trader Rating: (3) Feedback Score: 3 reviews	If the stud is a rear one, cut the rear member out of a donor car, drill all the spot welds out, the drill all the spot welds out of your car and put the new member in and weld the holes.. Long process....

05-09-2015, 10:21 AM	#8
Thedriftbadger Zilvia Junkie Join Date: Jun 2013 Location: ontario Posts: 305 Trader Rating: (0) Feedback Score: 0 reviews	You dont need another car to fix this lol. Find the location of the stud inside the car in the trunk area, cut a spot out of the floor pan. Hammer it up from the bottom of the car, they are installed like a wheel stud, with knurls at the top. Drop in an appropriately sized bolt, weld the head in place. Reinstall subframe, weld the piece of floor pan back in. Done. Lift the car as high as you can and preferably at an angle so you can get as much force with as big a hammer as possible because those fuckers are seriously in there.