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Thread: Bolt-In vs Weld-In
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06-06-2010, 05:31 PM #1
Bolt-In vs Weld-In
Okay, I'm looking at some SFCs for my vert and people have suggested that I go with weld-in SFCs. I've noticed that bolt-ins are also an option.
My question is this:
Is there a performance difference between bolt-ins and weld-ins? Also it seems like if I need access to certain parts of the drive train, the weld-ins could complicate things by being a permanently "integrated" part of the car, whereas the bolt-ins could be taken right off no problem. Also, the bolt-ins seem easy enough to DIY, whereas I don't have means to weld anything onto my car.
What would I be sacrificing by going with bolt-ins instead of weld-ins? Also, if I get the bolt-ins, can I just weld them on later for the same effect as original weld-ins?
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06-06-2010, 06:11 PM #2
- Join Date
- Aug 2005
- Location
- Thornton, CO
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- 23,773
Red Tint Jewelcoat- 2008 Trailblazer SS
Bolt-ins can shift.
Weld-ins will not.
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06-06-2010, 08:40 PM #3
You can always bolt them in now and weld them later. I personally got weld-in and would suggest the same.
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06-06-2010, 08:57 PM #4
I just got my UMI weld-ins put on last week, and couldn't be happier. For stability reasons I would run the weld-ins, just make sure you have a shop that knows what their doing do the install. You won't be disappointed.
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06-06-2010, 08:57 PM #5
Weld in for sure with the vert.
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06-06-2010, 09:10 PM #6
i still havent bought into this whole weld-in with just basic bolt ons. if you plan on getting the car into the 425+ RWHP range id say weld em, otherwise your bolts wont snap and from my expirience, wont move either.
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06-06-2010, 11:24 PM #7
I'm going to get bolt in sfc's so I can install them in the driveway and down the line if I ever start making big power I'll have them welded.
question: when getting sfc's welded, the full weight of the car needs to be on the suspension but when your just bolting the sfc's does this matter as much?
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06-07-2010, 05:44 AM #8
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06-07-2010, 06:14 AM #9
-full weight must be on suspension for the bolt ins as well.
-i did bolt ins and got them welded shortly after i installed them cuz they were creaking and rattling. if i could do it again i would just go with the weld ins and have a shop weld em up because your most likely going to have them do it eventually.
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06-07-2010, 06:52 AM #10
I bolted mine in..no creeks, no sounds..car feels good. Just gotta torque them right and follow directions.
Did I meantion torque them right? You'll need to torque them correctly. Make sure you torque them correctly. Torqueing them correctly is important.
Torque.
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06-07-2010, 06:58 AM #11
Mine were torqued to spec and still creeked. so i followed the directions and increased the torque. there was creeking. so i had a shop weld em. bamm no creeks. i followed the directions word for word still creeked.
-o and i believe the weld ins are bit cheaper if that matters at all.
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06-07-2010, 07:09 AM #12
- Join Date
- Aug 1999
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- Arizona
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- 51,360
Black- 383 Procharged & N20 Vert
Get the weld in. I run BMR and they don't get in the way.
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06-07-2010, 07:16 AM #13
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06-07-2010, 07:56 AM #14
- Join Date
- Jan 2009
- Location
- Pa
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- 137
Hello
Like mentioned above UMI Performance offers both for the convenience of the customer. Not all of the customers have welders nor want to weld on the vehicle. So then in that case they just go with the bolt on SFC's. Then if needed later down the road you can always have them welded. If you have any other questions feel free to ask.
Thanks
Brad
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06-07-2010, 07:59 AM #15
^^ Very happy with my UMI bolt-ins and have had no issues since installation almost a year ago.
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06-07-2010, 08:23 AM #16
- Join Date
- Apr 2010
- Location
- Alpharetta, Ga
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- 51
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- 1,060
04 Cobra 'vert - M6 mysti- 02 WS6 coupe - A4 red
I talked to a guy at a shop here where I plan to have some work done in the near future. He basically said what many have said on here, that it's good to start with bolt-on and then weld them on later. It lets you verify that they are on correctly and the drive feels right before permanently welding them in. And it lets you pull them back out if you're doing any other work under there, like exhaust work.
I'm a noob so I don't have my own opinion, that's just what I was told when I asked about it.
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06-08-2010, 01:35 AM #17
Okay, cool. I think I'll go with bolt-ins first and then weld them on when I get the chance.
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