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Old 11-22-2002, 05:37 PM
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Post F body subframe connecters.

I've been looking through different parts cat. and have found many different brands and styles of subframe connecters. Some are bolt on some are weld on some you have to modify your floorpans to use them, some are seamless carbon steel etc etc. What do you recomend? Has annyone made their own, if so how and did it work out. Seems rather simple and could be done by a machine shop for half the price. Any opinions? Thank you.

HK

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Old 11-22-2002, 06:24 PM
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Yeah the weld in are best (you can weld in most bolt on ones) they are fairly simple to make.... What the average hotrodder makes in their garage is gunna be 20 times better than what they sell... basically what they sell are 2 bars that go under the rocker area and 2 tubes that connnect to the frame... I think there also may be some so they connect front and back... I am going to make my own out of box beam for my 85 z28.. basically I wanna have them go along my ground effects so they are about 1/4 to 1/2 inch lower (protect the ground effects from curbs and other bumps) I am going to weld them to my floor with along (probably tacks in most places) and then I am going to have it come across and connect to the main structural parts in 3 places... front, back, and middle... After I try that out I might connect them the cross bars together at the other end with some angle iron or more box beam... (wayy overkill I know but that is my way)
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Old 11-22-2002, 07:42 PM
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I don't think having your "frame" lower to protect your groud FX is smart, I rather have the ground FX damaged than my frame. Welding them to the floorboards I think would a mistake as well do to chassis flex. Welding it to the floor would bring any flex from the subframes to the floor board and rest of the body and could seriously damage it. Thats just my $0.27 I've used them before in a 2nd gen. camaro, but not had the chance to ask about them until now.

HK
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Old 11-23-2002, 06:11 AM
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Having the frame hit the ground first is pretty common in race cars HK so it is not that dangerous as long as the part to hit first is solid and mounted properly and shaped right. I use seamless rectangular mechanical tubing for these types of projects. Definetly build your own, the stuff they sell is junk and usually has to modified to fit anyway.
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Old 11-23-2002, 06:49 PM
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There should not be any problems welding the subframes in with the floor. Look at it like this. In stock condition the body is the frame essentially. If you connect the front and rear frames you add strength in addition to the body. If you weld them in the floor properly, you integrate the strength into the original design of the car. This will actually take more flex out of the car. Remember, if the subframe connectors can move at all then the body is flexing.


Chris
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Old 11-23-2002, 07:03 PM
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It is like triangulation in a way... by connecting the whole thing to the floor it forces the subframe connectors and the floor to twist together... I have a 3rd gen f body so my car is a unibody anyway... The reason I am going to have the subframe connectors hit the ground first is my ground effects are beat to **** and I am fixing them.. it will be solid box beam metal so I don't think it will bend... also if I put them so that the gound effects hit first the ground effects will break and the subframe connectors will get the blow along with my rocker panel..
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Old 11-23-2002, 07:12 PM
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Thanks guys. Makes sence now that someone else says it. I never liked frame hitting <img src="graemlins/drunk.gif" border="0" alt="[drunk]" /> The crazy part is in the old days frame scrappin' was cool and a skill to have if you were a lowrider

HK
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Old 11-23-2002, 09:48 PM
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well you can still do it... just put magnesium bars sticking really far down from your subfram connectors... then it will make cool sparks on every bump
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Old 11-23-2002, 10:00 PM
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Nooo, I don't mix my hobbies, lowrider stuff stays on lowriders, anyway you use titanium, they last longer in my exsperience and shoot bright white sparks farther behind you

HK
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Old 11-24-2002, 04:49 PM
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well there are a varity of metals that will work... anyway... i don't think sparking sounds very cool on an f body just like I don't think a 4X4 truck should have hydrolics... just my opinion but I have seen stranger things done..
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Old 01-22-2003, 02:44 AM
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Hi guys!
I see that this is an old subject but anway, Do you know where I could find any sketch or drawing for SFC's for a -75 F-body, (firebird but it should be the same)?
<img src="graemlins/pimp.gif" border="0" alt="[pimp]" />
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Old 01-22-2003, 02:42 PM
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check out spohn.com

n/m just checked the site they didn't have em...

You consider doing em yourself???

[ January 22, 2003: Message edited by: stonedchihuahua ]</p>
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Old 01-24-2003, 10:00 AM
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I put aftermarket subframe connectors in my mustang and had them welded in, it worked out really well and rrrrrrrrrreally strengthened up the car. No flexing now, need to get the cuda done though.

The Problem with Bolt on is that after a while the holes elongate and you end up trashing what little frame the manufacturer originally put in your car.......I wish they all had full frames.
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Old 01-24-2003, 01:31 PM
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well what alot of guys do with the bolt ons is bolt them in and then weld them up after... I personally don't trust bolts over welds for holding somethign together unless it needs to come apart again
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Old 01-24-2003, 04:39 PM
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You might find some helpful info on these pages.

www.geocities.com/casanoc/
<a href="http://ourworld.compuserve.com/homepages/David_Pozzi/first_gen_suspension.htm]http://ourworld.compuserve.com/homepages/David_Pozzi/first_gen_suspension.htm[/URL]
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