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Go Back   IWSTI.com: Subaru WRX STI Forums > GD Series STi Discussion (2003/4-2007) > GD-Technical > GD-Suspension, Handling, & Stiffening


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Old 10-17-2007, 06:06 PM   #46
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Default Re: front subframe - need some input

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Originally Posted by fullerton View Post
look at the picts and you'll see why we ask.
You will see the bar directly under the oil filter. I want to know the clearance since a lot of us run a longer oil filter.


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Old 10-17-2007, 06:08 PM   #47
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Default Re: front subframe - need some input

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Originally Posted by Rookie84 View Post
I want one. I was waiting for RPM to come out with their solution for undertray forever(that and saving up money ), but this one has all the things I'm looking for. But it looks like it will not be very light.
It may be depending on what he makes it out of.
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Old 10-17-2007, 06:40 PM   #48
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Default Re: front subframe - need some input

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Originally Posted by QuickSilverSTi View Post
You will see the bar directly under the oil filter. I want to know the clearance since a lot of us run a longer oil filter.
He moved some tubes around for more header clearance. that's gonna give you more room for the oil filter access as well.

I'll see if I can get undertray pics.
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Old 10-24-2007, 04:57 PM   #49
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Default Re: front subframe - need some input

pics available yet?
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Old 10-25-2007, 10:00 AM   #50
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Default Re: front subframe - need some input

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Originally Posted by Saabaru STI View Post
I would recommend against the chromoly for weight purposes.
What do you suggest they use? CrMo has excellent strength-to-weight, which is why you can still buy high end bicycles made out of the stuff. It seems to me to be the ideal material for this application. The only thing that might be better is Ti, but then the price would be out of the reach of us mortal folk.
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Old 10-26-2007, 03:42 PM   #51
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Default Re: front subframe - need some input

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Originally Posted by wdb View Post
What do you suggest they use? CrMo has excellent strength-to-weight, which is why you can still buy high end bicycles made out of the stuff. It seems to me to be the ideal material for this application. The only thing that might be better is Ti, but then the price would be out of the reach of us mortal folk.
Aluminum. Most of the aftermarket ones are aluminum and work fine.

The biggest argument to use Chromoly is the strength, but I figured most people that hardcore should get a welded roll-cage (chromoly).
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Old 10-26-2007, 03:53 PM   #52
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Default Re: front subframe - need some input

that thing is pretty nice im sure it makes the car alot stronger on turns....
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Old 10-27-2007, 03:23 PM   #53
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Default Re: front subframe - need some input

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Originally Posted by Saabaru STI View Post
Aluminum. Most of the aftermarket ones are aluminum and work fine.

The biggest argument to use Chromoly is the strength, but I figured most people that hardcore should get a welded roll-cage (chromoly).
It has to do with modulus of elasticity of the material. Cromoly has a much higher modulus than aluminum for a given weight of material. And since the idea is to reduce flex as much as possible my opinion is the cromoly is the better material. To get an aluminum brace to be as stiff as a cromoly one it will be alot bulkier and run into more fitment issues. And since bicycles were brought up look at the frames of the aluminum bikes versus the cromoly ones. Your average aluminum frame has tubes the size of beer cans while the steel frames are much smaller tubing wise. My .02 worth.
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Old 10-27-2007, 04:08 PM   #54
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Default Re: front subframe - need some input

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Originally Posted by Turbineguy View Post
It has to do with modulus of elasticity of the material. Cromoly has a much higher modulus than aluminum for a given weight of material.
ITYM "for a given volume of material". There are aluminum alloys that compete very closely with CrMo from a strength/weight perspective. But as you go on say:
Quote:
To get an aluminum brace to be as stiff as a cromoly one it will be alot bulkier and run into more fitment issues.
Exactamundo. An aluminum brace with the same rough dimensions of a CrMo brace would be a noodle. An aluminum brace with the same strength as a CrMo brace would be enormous.
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Old 10-27-2007, 04:18 PM   #55
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Default Re: front subframe - need some input

Yes volume is the correct definition. Been a while since I messed with any metalurgy stuff.
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Old 10-28-2007, 01:49 PM   #56
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Default Re: front subframe - need some input

Subscribe!!! Looks like a good start to another fine TIC product.
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Old 10-28-2007, 02:43 PM   #57
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Default Re: front subframe - need some input

This is NOT a TiC product. This is something we've been begging the guy we know to start producing them. So far two are in existance. One on his car, and one on his boss's.

The entire purpose of this thread is to show that there would be enough interest that he can convince his boss that he should make these during the day from time to time. Otherwise, he has no interest in going home at the end of the day and making them. He welds crap like this for a living - why would he want to do it in his spare time as well?
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Old 10-28-2007, 09:11 PM   #58
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Default Re: front subframe - need some input

Maybe we can blast his boss with a bunch of e-mails begging for these braces. I agree if I welded all day thats the last thing I would do when I got home.
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Old 10-29-2007, 08:50 AM   #59
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Default Re: front subframe - need some input

Supermarkus mentioned that there'd be no where for the engine or tranny to "submarine" in a front end collision because of all the stiff bracing underneath.

Would that be a risk with this subframe? If so, that would rule me out, and probably a lot of guys daily driving their STI's who wouldn't want to risk eating fuel lines and intake manifolds in a crash
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Old 10-29-2007, 09:10 AM   #60
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Default Re: front subframe - need some input

I understand that the chromoly would be stiffer. My point is the function of a subframe brace should be equally, if not more, weight vs. stiffness. If someone is that hardcore about chassis stiffening, get a welded roll-cage.


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