I feel that you expect too much from your car. So far we have BMW handling (assuming grip and quality) while having no compromises in straight line performance. First off, asking for a Mustang to handle as well as a BMW and retaining ride quality just doesnt work for the Mustang. So pretty much we have three areas of concern, ride quality, cornering/braking, and straight line/drag acceleration. You must decide what you want to do. There will be compromises just like Cobraaph said.
A car that performs well on an autocross will have compromises that the drag racer doesnt want, such as limiting weight transfer and heavy brakes. A car setup for drag racing will have compromises that an autocrosser will not want, such as loose suspension, and such. A car setup for either drag racing or autocross will generally compromise ride quality and have some increase in NVH. Compromises.
You have springs on the way, what shocks/struts do you have on the way? The stock shocks/struts are fine for stock springs. Increase spring rate and ride quality and handling will decrease. Shocks/struts are more important than springs. Personally, if you are concerned with ride quality and want good handling, you should look at a coil-over setup. This will allow you higher spring rates while decreasing weight and reducing bind (better ride quality). But just like the springs above, proper shocks/struts must be used. The MM coil-over kit would be a good start. The kit also comes with C/C plates which will be something you want too. MM can help you choose the spring rates for your desired purpose.
Chassis stiffening is a definite must for Mustangs. The MM SFC and STB will be a good start. As for the kmember brace, I didnt feel any difference when I installed a KB unit. I have bent that KB unit though, so there must be enough force down there to require bracing...
Swaybars should really be the very last thing you change. They are best used to tune/balance the car depending on driver and mods.
Now for the most important mod...YOU! If you want to improve your performance at autocross, you must improve yourself. The driver mods will make the BIGGEST difference. There are two ways to mod the driver (without replacement) and that is seat time and knowledge. For seat time, autocross some more, take some driving schools, do some track events. These will all make the biggest difference than anything you can do to your car. The best thing about this, there isnt any compromises (except a lighter wallet if you option for expensive driving schools). As for knowledge, search and read. The corral is a good place to start. There are tons of topics that have been covered that are just a search button away.
Tim ||||||| ||||||| |||||||
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07 Subie Impreza - DD
92 GT SSP
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