Welding Alston SFC
Joined: Jun 2015
Posts: 2,188
Likes: 243
From: Austin, TX
Car: 90 Formula / T-tops
Engine: 305 TPI
Transmission: MD8
Re: Welding Alston SFC
This topic has been covered in the past, you might search around to get more info, including some photos.
Thread Starter
Junior Member
Joined: May 2009
Posts: 74
Likes: 1
From: Ottawa, ON
Car: 92 players unraced
Engine: LB9
Re: Welding Alston SFC
Most install prior to interior work as part of a full build, haven't seen many people add them to a finished car. One user did it but had aftermarket underlay.
I know the rear subframe is rather light. Wondering if anyone could share their install experience. Worst case I'll pull the carpet, but some peace of mind would be great
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Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Welding Alston SFC
Pull the carpet if any welding on or near the floor pan happens
Re: Welding Alston SFC
Unbolt the front seats and slip something under the carpet to get it up off the floor. Takes minutes to keep your car from turning into a fireball, why even risk it?
Thread Starter
Junior Member
Joined: May 2009
Posts: 74
Likes: 1
From: Ottawa, ON
Car: 92 players unraced
Engine: LB9
Re: Welding Alston SFC
I appreciate all the responses
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Joined: Dec 1999
Posts: 5,964
Likes: 37
From: Hacienda Heights, CA
Car: 90 RS 'Vert, 88 IROC-Z, 88 Firebird
Engine: 305 ci tbi, 305 ci tpi, 350 ci tpi
Transmission: WC-T5, WC-T5, 700R4
Axle/Gears: 3.45, 3.27, 3.27
Re: Welding Alston SFC
You can also sit in your car with a water spray bottle and spray the carpeting if you see and smoking.
But as was written earlier you can easily remove the seat, door sil trim pieces, then slip in a 2x2 or 2x4 to lift the carpeting and backing pad.
Lon
But as was written earlier you can easily remove the seat, door sil trim pieces, then slip in a 2x2 or 2x4 to lift the carpeting and backing pad.
Lon
Joined: Oct 2003
Posts: 508
Likes: 9
From: Columbus, Ohio
Car: 1986 Iroc
Engine: Afr 408
Transmission: T56 Magnum
Axle/Gears: Moser 9" 3.70s
Re: Welding Alston SFC
I just welding mine in about a month ago and I pulled all the seats and raised the carpet off the floor with some wood blocks in the welding areas. The floor definitely got hot. Especially where they connect to the frame by the transmission. I highly recommend it. Both front parts got hot enough that I ended up using a damp rag to help cool the floor.
Joined: Jun 2003
Posts: 5,028
Likes: 78
From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: Welding Alston SFC
I'ts absolutely safe to weld on the underside of these cars while having a full interior in place. Ask me how I know 

Joined: Jun 2003
Posts: 5,028
Likes: 78
From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: Welding Alston SFC
In October of 2017 I found out the hard way that welding on the underside of a car that has a full interior is bad advice. Thank God I keep a hose in the garage for washing cars or it would have been much worse. Heck I even took the precaution of soaking the entire carpet with water before welding and it still caught fire. If you don't want to remove the center console then at least remove the seats and sill plates and fold the carpet over the center console to the other side while you weld.
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TomP
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Jul 14, 2003 01:01 PM






