SFC comparison thread
#201
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Re: SFC comparison thread
I run both. Mac and SPOHN. I like both. Inners are beefier and tie the front subframe directly in a straight line to the rear subframe. The outer style has a tube run along the rocker that is stitch welded along the rocker (I've jacked the car from these and they work really well) and then there's a tube that connects the front part of the outer tube to the front subframe, and the rear end of the rocker tube has a small tube that tie into the rear LCA mount part of the frame (not the beefy rear subframe). So, the inners and outers tie in different parts of the subframe/body/rocker..
Also, yeh I've been looking for those KB pieces for a couple years now.. No luck
Also, yeh I've been looking for those KB pieces for a couple years now.. No luck
Last edited by hellz_wings; 09-05-2013 at 11:21 AM.
#202
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Car: 84 TA / 89 Formula
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Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: SFC comparison thread
Thanks for your input. Yeah I think I have a pretty good idea now of the inner and outer design, just not sure which one is better or for what application.. Anyways prolly gonna get both as said
Which ones are those KB pieces?
Does anyone know if you can stitch weld the UMI boxed ones to the rocker rails or are they too far away to do that? Summit has a 2 weeks backorder on the GlobalWest :/ I kinda have to get the SFCs from Summit because of shipping options..
Which ones are those KB pieces?
Does anyone know if you can stitch weld the UMI boxed ones to the rocker rails or are they too far away to do that? Summit has a 2 weeks backorder on the GlobalWest :/ I kinda have to get the SFCs from Summit because of shipping options..
#204
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Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
Re: SFC comparison thread
I just welded in the Spohn connectors for my 91 convertible. Not many options for a vert. I screwed up and ordered the powdered coated ones. I didn't realize that I would have to sand it off to weld it in. I'll let you all know if they do whet they are advertised to.
#206
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Car: 1986 Trans Am
Engine: 305
Transmission: T5
Axle/Gears: 3.08? unlimited slip
Re: SFC comparison thread
FueledSoul, is there any chance you would be willing to make and sell me a set of those connectors?
#207
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Car: 1989 G92 IROC-Z
Engine: 5 Liter 305
Transmission: T5
Axle/Gears: 3.45
Re: SFC comparison thread
After reading this entire thread and searching every thread I could find on every subframe connector still offered I have but one solid piece of info. Nobody agrees as to which is best. S&W looks like a better kit than most, but the cross bar hangs really low. Looks like going with the perimeter style along with the alstons is the best bet.
Is there anyone running a Mufflex 4" system with ANY of these connectors?
Is there anyone running a Mufflex 4" system with ANY of these connectors?
Last edited by TxTtopZ; 06-24-2014 at 06:27 PM.
#208
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Car: 86-FireBird
Engine: -MPFI
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Re: SFC comparison thread
Its very easy.
Alstons take a very pricy hydro from machine to build and shape the tube.
All the rest you can make at home with square stock and a welder.
Alstons take a very pricy hydro from machine to build and shape the tube.
All the rest you can make at home with square stock and a welder.
#209
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Re: SFC comparison thread
After reading this entire thread and searching every thread I could find on every subframe connector still offered I have but one solid piece of info. Nobody agrees as to which is best. S&W looks like a better kit than most, but the cross bar hangs really low. Looks like going with the perimeter style along with the alstons is the best bet.
Is there anyone running a Mufflex 4" system with ANY of these connectors?
Is there anyone running a Mufflex 4" system with ANY of these connectors?
#212
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Re: SFC comparison thread
I tried to mount the MAC inner ones on my camaro today. Camaro already has UMI perimeter ones on it and found they wont install if you run a spohn t56 crossmember. already ordered a Hawks crossmember for the Firebird so will check when it arrives. Might have to buy a second one
#213
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Re: SFC comparison thread
I tried to mount the MAC inner ones on my camaro today. Camaro already has UMI perimeter ones on it and found they wont install if you run a spohn t56 crossmember. already ordered a Hawks crossmember for the Firebird so will check when it arrives. Might have to buy a second one
#214
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Re: SFC comparison thread
I noticed more when I put the perimeter ones on my camaro than I did when I put the inner ones on my firebird. But the camaro had bad door hinged and was overall in a loose and rattle prone compared to my firebird which was tight and doors closed perfect. In short, yes they make I big difference. But you can only run perimeter if you have any aftermarket crossmember due to a trans swap. Inner won't clear hawks or spohn T56 or 4L60E. I tried them both on both cars
#215
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Re: SFC comparison thread
I have MAC inners and SPOHN outers but was hoping one day to do an LS1 swap.. That kinda sucks, I guess I would have to cut the inners out or something.. Wouldn't a 4L60E fit in the 700R4 stock crossmember? Doesn't the 4L60E have the same external dimensions as the 700R4?
#216
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Re: SFC comparison thread
The LS 4L60E is set back just like my LT1 T56 in my camaro. Only thing I notice is the bellhousing is different on the ls. I have to cut out mine on the firebird to use the hawk crossmember. Actually going to try to modify it to still work. Just bought a set of BMR perimeter for the Bird cause my goal was to run both on both cars.
#219
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Car: 83 Z28, 87 442 (Sold)
Engine: 5.0, 5.7,
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Re: SFC comparison thread
Originally Posted by SCCAjunkie
Anyone know why these are listed as 86-92? I have an 84 Z28, so I'm wondering if there's a fitment issue...
http://www.macperformance.com/store/...Product_ID=434
http://www.macperformance.com/store/...Product_ID=434
http://www.ws6project.com/user_stor/...owder-coated-/
However, I have an 83. Will these really not work on pre-86 cars? I didn't see this question answered yet... maybe I missed it.
Do they fit the 82-85 cars?
Sorta.
The Driver side is a perfect fit (just protect the gas and brake lines prior to welding). The issue on the passenger side is not the transmission mount/crossmenber, or what have you. The issue on the older cars is the "massive" pellet style catalytic converter used in many of these cars. If you plan to keep the stock exhaust and the stock catalytic converter then there is not enough clearance. but if you swap in new OE cats or smaller aftermarket cats then it will fit your 83 just as nice as an 86-92.
#220
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Re: SFC comparison thread
I figured i would upload my home-made sub-frame connectors, iv had them on the car for about a year now..passenger side is not complete yet though..All the driver side needs is to have a plate that boxes in the rear LCA mounting location...i used Square tubing and an arc welder.. 1"x1"x5/16" square tubing.
#222
Member
Re: SFC comparison thread
The welds look worse than they are, i used 6013 3/32 rod for pentration which does go all the way through because where each tube meets i did a V notch and did multiple weld then grinded down then did a one pass over with the 7013 1/8" and only grinded down where it meets the floor pan no need in making the welds look 100% perfect on top of the metal,for as noone knows i have them until i tell them..although i will be taking it to a muffler shop to have them welded into place on the pinch area and on the from subframe.
#224
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Car: 1989 GTA
Engine: LS coming soon
Transmission: 80E coming soon
Axle/Gears: S60/35 Spline/S-Trac/3.73
Re: SFC comparison thread
Does anyone have the S&W subframes installed?
I would love to see a picture on car before I order them.
Along with the torque arm, this might be a great setup for my LS3/80E swap!
I would love to see a picture on car before I order them.
Along with the torque arm, this might be a great setup for my LS3/80E swap!
#225
Re: SFC comparison thread
Just a heads up, JEGS has the umi subframe connectors on sale for $177.09 with free shipping....
http://www.jegs.com/i/UMI+Performanc...400-R/10002/-1
http://www.jegs.com/i/UMI+Performanc...400-R/10002/-1
#226
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Re: SFC comparison thread
#233
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Re: SFC comparison thread
Just a heads up, JEGS has the umi subframe connectors on sale for $177.09 with free shipping....
http://www.jegs.com/i/UMI+Performanc...400-R/10002/-1
http://www.jegs.com/i/UMI+Performanc...400-R/10002/-1
#242
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Car: -88 TA GTA
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Re: SFC comparison thread
I bought the Alstons, but didnt get them installed yet. I like that they tie in the subframes directly. How about jacking? From what Ive seen they would provide good jack points for the rear, but how about the front? Or can I jack up both wheels if I put the jack in the middle between the wheels?
#243
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Car: '85 Camaro
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Re: SFC comparison thread
Yeah, I don't even have a third gen yet, but I've been presearching. So the inners are either Mac or Alston? I can find the Alstons from TDS and Hawks,can't find the Macs period.
I really like the theoretical strength advantage of outers that require cutting through parts of the floors, but what about carpet fit?
I'm also liking the outers that connect to multiple points at either end, but these seem to call for a more traditional exhaust routing, right?
I really like the theoretical strength advantage of outers that require cutting through parts of the floors, but what about carpet fit?
I'm also liking the outers that connect to multiple points at either end, but these seem to call for a more traditional exhaust routing, right?
#244
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Car: '91 GTA, '92 T/A Convertible
Engine: GTA: 350 w/Vortec heads, T/A: 305
Transmission: Pro-built 700R4
Axle/Gears: GTA: 3.27, T/A: 2.73
Re: SFC comparison thread
Looks like we are in the vast minority in that there aren't too many people on here running the GW SFCs. I love mine. Tucked up under there nice and tight. Fit perfect and they blend in nicely with the undercarriage.
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