Noob here, Looking to autocross my S650 GT with PP. I feel car handles like a boat. But I do want to stay in FS class. according to google I can't do much, other than adjust to max allowable camber car can handle as per factory specs limits, drop in filters,cat back exhaust and one sway bar. My car already has active exhaust stock, I thought about adding MBRP H pipe. Maybe Steeda 1 3/8 front sway bar or should I go rear? On top will do an alignment a shop can maximum squeeze out of the car but but within factory specs, I know there isn't much of adjustment available. Any recommendations folks? I previosuly had ZL1 1LE for comparison that is why I say Stang handles like a boat.

Welcome to TMO and FS is a tough class but you are asking the right questions. Tires will make a huge difference and the current data being seen at SCCA National Tours is that the RE71RZ is the " Gold Standard." Get the alignment maxed in front and do a bit less in the rear. Example if you get -1.85 in front do something around -1.35 in the rear. There are quite a few very solid autocrossers on here and I am sure you will get more info. I ran FS over 3 decades ago and even today it is still a competitive and fun Class. Even though many here are running CAMC , there are a couple of my good friends running F Street and I hope they will pop in here to offer some thoughts. Hang in there , it is a great Class to start your autocross adventure.

Arrow_Stang said:

Noob here, Looking to autocross my S650 GT with PP. I feel car handles like a boat. But I do want to stay in FS class. according to google I can't do much, other than adjust to max allowable camber car can handle as per factory specs limits, drop in filters,cat back exhaust and one sway bar. My car already has active exhaust stock, I thought about adding MBRP H pipe. Maybe Steeda 1 3/8 front sway bar or should I go rear? On top will do an alignment a shop can maximum squeeze out of the car but but within factory specs, I know there isn't much of adjustment available. Any recommendations folks? I previosuly had ZL1 1LE for comparison that is why I say Stang handles like a boat.

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PP is unfortunately not going to be a competitive car in FS, mostly limited by wheel width. You can technically change dampers (and if you have Magneride - I believe this year they allowed controller change so you can get an aftermarket controller) but not springs and a single sway bar.

S550 shop manual allowed to slot strut holes by 1mm and allowed use of Ford non-splined bolts (vs stock splined ones) which allowed to get a little bit more front camber.
Why did you go to S650 PP from ZLE if you don't mind me asking ?

k_z said:

PP is unfortunately not going to be a competitive car in FS, mostly limited by wheel width. You can technically change dampers (and if you have Magneride - I believe this year they allowed controller change so you can get an aftermarket controller) but not springs and a single sway bar.

S550 shop manual allowed to slot strut holes by 1mm and allowed use of Ford non-splined bolts (vs stock splined ones) which allowed to get a little bit more front camber.
Why did you go to S650 PP from ZLE if you don't mind me asking ?

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Mine is non mag ride, just stiffer springs that come wtih PP. But doesn't feel like it. Oh I didnt go directly from Z to Stang. I had car in between that turned out to be junk. I decided to try a mustang. I will try to swing for max camber I can get it out of stock which I readi is 1.5-1.8? If so what do I do with rear 1.2-1.4? I want to stay in FS. Until I get bored and can't do it anymore I will push to Cam C.

Arrow_Stang said:

Mine is non mag ride, just stiffer springs that come wtih PP. But doesn't feel like it. Oh I didnt go directly from Z to Stang. I had car in between that turned out to be junk. I decided to try a mustang. I will try to swing for max camber I can get it out of stock which I readi is 1.5-1.8? If so what do I do with rear 1.2-1.4? I want to stay in FS. Until I get bored and can't do it anymore I will push to Cam C.

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Don't know if anything changed for S650 but S550 had pretty soft springs - best you can do is get a set of Konis (alternatively Ford Performance or Billsteins if available for S650 but those are non-adjustable).
Sam Strano sells rear dual adjustable Penskes that he uses on his FS car (S550 Mach 1) which just about as best as you can do. Also 18+ S550s had pretty terrible geared transmission in 2nd gear that shorter (smaller diameter) tire helped a lot with.

You used to be able to get around -2 degrees front camber with slotting the struts and service bolts, I'd do around 1.8-2 in the rear maybe ?