[jp55]

Can you leave the stock framerails in the car when going 25.2? Car is a 55 Chevy & is already backhalved & tied into the stock frame.The SFI book doesen't say.I'm sure this has been done before just want to make sure it's going to be right.Thanks

 

[turbo55]

why not cut it out and lose a little weight? it may be hard to get under 3200

 

[jp55]

That's definately a possibility,just trying to get away from cutting out work that's already done.

 

[Gearhead559]

That's definately a possibility,just trying to get away from cutting out work that's already done.

you may have to sign up to see the pics in this post
http://www.theturboforums.com/smf/index.php?topic=113835.msg1118635#msg1118635
but theres tons of 25.5 and 25.2 info on that site! plus lots of great guys that will help out

the pics in the link i think are of his 25.2 510, but im not too sure of that!

 

[jp55]

Anyone if these are legal for a removable trans crossmember?

 

[unholy1]

I was under the impression that 25.2 couldn't have any mild steel or any part of the factory frame :smt102

 

[Gearhead559]

I was under the impression that 25.2 couldn't have any mild steel or any part of the factory frame :smt102

25.5 is the only one that can have mild steel or all mild steel. all the rest have to be moly!

 

[Gearhead559]

Anyone if these are legal for a removable trans crossmember?

i dont see a pic here at work. ill look when i get home. you need to get the sfi book and read it till your eyes fall out then walk away and reread it again!
and the crossmember i have in that car is allowed i just was not reading the rule right..lmao ill have pics of the rest of it up tonight.

 

[race9899]

25.2 specs are all 4130..

25.4 and 25.5 are the ones that allow Mild Steel and Square tubing..

So get to cutting if you are wanting a 25.2

 

[race9899]

Anyone if these are legal for a removable trans crossmember?

25.2 does not have any allowances for a removable crossmember

 

[jp55]

Here's what I'm talking about:
http://camburg.com/images/fabricationParts/billetclampsnew/interlocking.jpg

Just got off the phone with Mike Rice from Div. 7 Tech & he said that as long as you follow the SFI book you can keep the stock frame & tie into it for 25.2 He also said that a removable trans crossmember was legal.So I don't know.

 

[deputydog]

I'm curious also, If you have a 25.5 cage in a full frame car and the main hoop and front down bars attach to the top of the factory frame I dont see how it can be converted to 25.2. The 25.2 book shows the main hoop/front down bars going to the top of an outer frame bar thats CM. I have both books but there not handy otherwise I would list the bars #'s.

 

[race9899]

Here's what I'm talking about:
http://camburg.com/images/fabricationParts/billetclampsnew/interlocking.jpg

Just got off the phone with Mike Rice from Div. 7 Tech & he said that as long as you follow the SFI book you can keep the stock frame & tie into it for 25.2 He also said that a removable trans crossmember was legal.So I don't know.

Nice pieces they make there,

As far leaving the stock frame for a 25.2 you could but you would have to build the round tube around the original frame, basically putting a round tube under or beside the frame, all of the SFI legal tubing in a 25.2 is round 4130

I have had tech guys tell me they would pass them but my 25.2 book has no allowances for one

 

[jp55]

Nice pieces they make there,

As far leaving the stock frame for a 25.2 you could but you would have to build the round tube around the original frame, basically putting a round tube under or beside the frame, all of the SFI legal tubing in a 25.2 is round 4130

I have had tech guys tell me they would pass them but my 25.2 book has no allowances for one

That's what I was planning on doing,just curious if anyone had done that before or if anyone had any pics.

 

[race9899]

I have had tech guys tell me they would pass them but my 25.2 book has no allowances for one

Talking about the removable trans crossmember there!

 

[race9899]

That's what I was planning on doing,just curious if anyone had done that before or if anyone had any pics.

I did a round tube car that the tubing was not the correct size for the lower frame rails. It sucked but we got it done. Looked kind of funny having 2 pieces of round tube ran side by side

 

[deputydog]

As far leaving the stock frame for a 25.2 you could but you would have to build the round tube around the original frame, basically putting a round tube under or beside the frame, all of the SFI legal tubing in a 25.2 is round 4130

Can the main hoop/down bars remain on top of the stock frame and a bar added low like a rocker bar? If you did this the front/rear 25.5 crossmembers would still intersect the stock frame not the outer frame required by the 25.2.

 

[race9899]

As far leaving the stock frame for a 25.2 you could but you would have to build the round tube around the original frame, basically putting a round tube under or beside the frame, all of the SFI legal tubing in a 25.2 is round 4130

Can the main hoop/down bars remain on top of the stock frame and a bar added low like a rocker bar? If you did this the front/rear 25.5 crossmembers would still intersect the stock frame not the outer frame required by the 25.2.

In a situation like that all of the tubing would have to be built above the frame All of the round tubing would have to intersect the round tube.