I think I may have made a mistake when I added MM full length subframes. I love 'em they tighten up the car but now I am cannot stay in the ESP class in the SCCA for autocross. Since the install I've found out that you can have a roll bar installed to the subframe that will tighten the car's chassis and stay legal in ESP 
Think twice before installing subframe connectors
- Thread starter livenfine
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T_5.0_N'works
New Member
GTPhreak
Founding Member
he is saying the subframe connectors he is using is against the rules in the class he races in, bumping him into a different class
That sucks. I personally wish I didn't spend the money on mine. After I put Bilsteins on, the ride was SO tight and perfect that the subs barely added anything. Sure I might reduce some flex, but I don't race, autoX, or anything. My car is just for street use. Live and learn 
jadedinpa
Founding Member
mansonozz, my vert was totally stock when i added subframes on. it made a night and day difference! when i used to go over railroad tracks i could feel the car twisting as each tire went over the tracks. no more since i added the subframes 
i'm suprised yours didn't make much difference....
i'm suprised yours didn't make much difference....
91BlckGT
Founding Member
It can't be said enough, well-crafted subframes are an absolutely essentially addition to any FOX based chasis. You need to eliminate chassis flex to let the suspension do it's job. I'm so happy I put mine on 5 years ago, and with jacking rails, and some other bracing, it's made a world of difference.
tvmango
New Member
PonyBoy90 said:
Sorry for the confusion, subframes help stiffen the chassis-no question about that. For autocross, I was hoping to stay in the ESP class, (street-prepared), but recently found out that the ESP class doesn't allow SFCs for '87-93 Mustangs. A speed shop in Seattle can custom make a 6 pt rollbar that ties to the subframes, (front and back), which stiffen like an SFC but are considered legal because of safety reasons.
If you not going to race, no sweat. If you are you should research these sort of things first. No SFCs, no gears lower than 3.27, no internal engine changes, etc for the ESP class.
jadedinpa said:mansonozz, my vert was totally stock when i added subframes on. it made a night and day difference! when i used to go over railroad tracks i could feel the car twisting as each tire went over the tracks. no more since i added the subframes
Like I said, I added my Bilsteins first. THEY made a HUUUUUUUUUUUUUUUUUUUUUUUUUUGE difference!! Un-freakin-believable ride from those
subframes?
I have a 99 Cobra and was moved from ESP because of the Matrix braces and Jacking rails on my KB suspension not the subframes. The subframes were simply replacements for the original Ford ones.The DC chapter was very clear that the subframes were legal but the Matrix and Jacking moved me to a modified class. I'd check into this if I were you.
livenfine said:I think I may have made a mistake when I added MM full length subframes. I love 'em they tighten up the car but now I am cannot stay in the ESP class in the SCCA for autocross. Since the install I've found out that you can have a roll bar installed to the subframe that will tighten the car's chassis and stay legal in ESP
I have a 99 Cobra and was moved from ESP because of the Matrix braces and Jacking rails on my KB suspension not the subframes. The subframes were simply replacements for the original Ford ones.The DC chapter was very clear that the subframes were legal but the Matrix and Jacking moved me to a modified class. I'd check into this if I were you.
Hi,
I was deciding which suspension items to start with. Is your info on ESP allowing subframes with a roll bar from the SCCA? I have a 2002 rule book that did not allow subframes. Could you give me the details?
Thanks
QUOTE=livenfine]I think I may have made a mistake when I added MM full length subframes. I love 'em they tighten up the car but now I am cannot stay in the ESP class in the SCCA for autocross. Since the install I've found out that you can have a roll bar installed to the subframe that will tighten the car's chassis and stay legal in ESP[/QUOTE]
I was deciding which suspension items to start with. Is your info on ESP allowing subframes with a roll bar from the SCCA? I have a 2002 rule book that did not allow subframes. Could you give me the details?
Thanks
QUOTE=livenfine]I think I may have made a mistake when I added MM full length subframes. I love 'em they tighten up the car but now I am cannot stay in the ESP class in the SCCA for autocross. Since the install I've found out that you can have a roll bar installed to the subframe that will tighten the car's chassis and stay legal in ESP
