Practical to Mod Tube K-member for Street? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 23 Old 10-05-2009, 05:26 PM Thread Starter
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Practical to Mod Tube K-member for Street?

After spending all day looking at the K-member posts and realizing the car I purchased for street usage (road racing) is set up for drag racing with a QA1, I'm at a lose for words. Options are to sale and start over, get another K-member, or modify the QA1 (has coilovers & tube control arms as well). Apparently, they are made from mild steel so welding won't be an issue. Has anyone attempted this or have an idea of the weak areas on these? How practical would it be to weld gussets or reinforcement tubes for additional strenght? Car is 1990 LX Coupe with SC running 450rwhp...

Comments or suggestions?

Thanks

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post #2 of 23 Old 10-05-2009, 06:31 PM
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I'd start over...

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post #3 of 23 Old 10-05-2009, 07:12 PM
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you're in the same boat i am, with the qa-1 garbage, great for a straight line but aren't steering wheels round?
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post #4 of 23 Old 10-05-2009, 11:52 PM
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+2 to start over....


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post #5 of 23 Old 10-06-2009, 05:12 AM
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Sell it

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post #6 of 23 Old 10-06-2009, 08:31 AM
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Hock the QA1 to a drag racer and get a MM or Griggs piece.
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post #7 of 23 Old 10-06-2009, 03:48 PM Thread Starter
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It probably makes the most sense to swap it out for a MM or a stock unit but is there that much of a difference structurally between the QA1 and the MM unit? Seems like they are very similar with a little bracing in the right places... understanding that the k-member isn't designed for the street out of the box but I read where D&D?? made a plate kit at one time to change their kit to street usage. May have to run a finite element model on the QA1 to see where the weak points are and look into adding plates before giving up... I guess I was hoping someone already looked into this. I have some kind of lower control arms, look like the GMS with Sway bar mounts and their coil over system so possibly all is not lost.
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post #8 of 23 Old 10-06-2009, 04:39 PM
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I'd be interested in this too...I happen to have a QA1 k-member lying around...maybe I can mod it instead of trying to sell it
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post #9 of 23 Old 10-07-2009, 08:16 AM
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I had a QA1 k-member in my car and i added some bracing to it and got MM A-arms (I was tired of busting QA1's bushings). I open tracked my car for 3 years with it around 8 times a year. My car doesn't see street driving.. almost at all but I was always afraid of running r-compounds at the track, so i always ran street tires. The rest of the car was always really strong and well balanced, so i got to lap really good times for running street tires. Today, I got the Agent-47 front end.... then I realized what i was missing...

Hector
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post #10 of 23 Old 10-07-2009, 08:39 AM
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Quote:
Originally Posted by Appaloosa View Post
but is there that much of a difference structurally between the QA1 and the MM unit?

not even close.


particularly non-stock 99 Cobra w/brand C motor...
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post #11 of 23 Old 10-07-2009, 09:05 AM
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Quote:
Originally Posted by BlackStripes2000GT View Post
I had a QA1 k-member in my car and i added some bracing to it and got MM A-arms (I was tired of busting QA1's bushings). I open tracked my car for 3 years with it around 8 times a year. My car doesn't see street driving.. almost at all but I was always afraid of running r-compounds at the track, so i always ran street tires. The rest of the car was always really strong and well balanced, so i got to lap really good times for running street tires. Today, I got the Agent-47 front end.... then I realized what i was missing...
got any pics of your modified qa1 ?
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post #12 of 23 Old 10-07-2009, 09:32 AM
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post #13 of 23 Old 10-07-2009, 10:12 AM
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Hmmmmmmmmm.....
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post #14 of 23 Old 10-07-2009, 10:37 AM
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hehe.. I never said that it was perfect, but it was noticeable difference after the bracket and the A-arms with decent bushings. The car was much mode rigid than before, I actually was 3.5 seconds off the record of ST2 (vettes) in my home track with street tires

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post #15 of 23 Old 10-07-2009, 05:55 PM
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if you need pics of differences....let us know...i think some of us have a few comparison pictures...


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post #16 of 23 Old 10-07-2009, 09:22 PM
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As did anyone who purchased a MM unit, I did a lot of research before my purchase. The fanboy internet jargon is absolutely right in this case... do the sensible thing and sell the QA1. You'll have absolutely zero problems selling it in the classifieds for near what you paid for it.

I'll tell you one thing, I would not want anything in the back of my mind during a fast sweeper doing 100mph. You have a weld give out and the car unsettles, could get ugly quick!

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post #17 of 23 Old 10-08-2009, 09:25 PM
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Quote:
Originally Posted by d90212 View Post
if you need pics of differences....let us know...i think some of us have a few comparison pictures...
i'd like to see the comparison pics....if you can email them to me, that'd be great...pm me for my email address

thanks
mark
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post #18 of 23 Old 10-09-2009, 11:32 PM Thread Starter
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I'm doing a 180 after sleeping on it. I'm going to keep the QA1 but modify it for street usage. My flop but going to try it anyway...

Last edited by Appaloosa; 10-10-2009 at 07:08 PM. Reason: Like the extra room of the K and too lazy to change it out.
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post #19 of 23 Old 10-11-2009, 08:01 PM
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I have never seen any tubular K member other than Maximum Motorsports, or Griggs, so I can't say for sure that the QA-1 is junk, but if I ever bought suspension parts for a Mustang, I'd be calling a shop in San Luis Obispo. I have built more road race Mustangs than most people here, and my cars have won a lot of races. When you're trying to find a welding shop on a Saturday night, the dollar difference won't seem so much. How much is your car worth to you? So why worry about a few hundred bucks.

Cream may rise to the top, but sometimes sh&t floats too.
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post #20 of 23 Old 10-11-2009, 10:48 PM Thread Starter
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Well its not the money as much as the application and time to swap it out. It will see occasional street usage for fun and drag, but not autocross so probably be ok with the way it is...

I don't think I'll be doing any autocross with 4" tires up front and 12" in back.
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post #21 of 23 Old 10-11-2009, 11:54 PM
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Quote:
Originally Posted by Appaloosa View Post
Well its not the money as much as the application and time to swap it out. It will see occasional street usage for fun and drag, but not autocross so probably be ok with the way it is...

I don't think I'll be doing any autocross with 4" tires up front and 12" in back.
Sorry, because I thought that's what you wanted.



Quote:
After spending all day looking at the K-member posts and realizing the car I purchased for street usage (road racing) is set up for drag racing with a QA1,

Cream may rise to the top, but sometimes sh&t floats too.
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post #22 of 23 Old 10-12-2009, 12:15 AM Thread Starter
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It was initially, but my post just prior to yours says...

"I'm doing a 180 after sleeping on it. I'm going to keep the QA1 but modify it for street usage. My flop but going to try it anyway..."

Decided to leave it a drag car but may beef up the QA1. The MM k-member has a few extra braces that I can duplicate to give me a little more margin. I know it will not be anything like the MM but it will add a little insurance. Car is set up for bracket racing and would be very expensive to convert back to full time street usage or autocross.

Thanks for the help.
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post #23 of 23 Old 10-13-2009, 03:26 PM
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Feel free to knock me on the head with that QA-1 k member.

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