Need some help on suspension modifications please.

[jakeru]

What autocross racing series or sanctioning body are you competing under, or plan to compete under? If you are serious about doing well in competition, my recommendation is to be mindful of whatever rules apply in your racing series. Making the "wrong" modification (e.g., in SCCA solo, putting aftermarket springs on a car which is otherwise "street" class compliant) can easily throw your car from competing in a class where it could have a chance of winning to a class where it has no chance.

If you don't really care about competing successfully, feel free to disregard. In any case, have fun!!

[eicheldp]

Thank you all for your input and advice. A little more on my plans and thoughts. I'm on a limited budget so I will be doing little things as time and money permit. Jakeru, currently I'm just competing within our PCA region where I run in class C. At times, we participate in SCCA events where I am in STU. I would like to win occasionally but I'm never going to nationals or anything like that. Just trying to improve myself and get off the bottom of the rankings.

Originally Posted by jakeru

What autocross racing series or sanctioning body are you competing under, or plan to compete under? If you are serious about doing well in competition, my recommendation is to be mindful of whatever rules apply in your racing series. Making the "wrong" modification (e.g., in SCCA solo, putting aftermarket springs on a car which is otherwise "street" class compliant) can easily throw your car from competing in a class where it could have a chance of winning to a class where it has no chance.

Topless, as I mentioned above, I just want to do some little things to improve the handling. I don't want to make my 986 a track car, I enjoy cruising in it as well. I will probably go for new struts when my stock units wear out. One set I may go for are the Koni FSD.

Originally Posted by Topless

Sorta depends on how far you want to go with it. My 986 was in development for 10 years and I have spent a lot of time riding right seat in other peoples cars, both novice and top national drivers.

Thanks for the chart Steve. What should I assume that I would have installed on my car? The standard suspension for a 3.2L or the Sport M030 bar for a 3.2L?

Originally Posted by steved0x

Here's a chart with the sway bar stiffness, that also includes the stiffness for the Eibach bars:

Thanks Tommy for the link. I'll have to seen if the p/n's are applicable to a 2004S

Originally Posted by tommy986

This page has chart for early cars through 2002.

Thanks TRK. Good advice. And it follows my budget & plan. I think I'll go with the Front sway bar. One other thought I had was to change out the bushings on the car. Would that tighten things up as well?

Originally Posted by The Radium King

stiffer front sway bar. will reduce body roll and improve turn-in. will not detract from ride quality. m030 (there used to be a great chart that showed the relative thicknesses of the various bars) is good option that doesn't require special drop links. or a 996 gt3 front sway bar - will require aftermarket drop links, but is adjustable. don't use H&R - too stiff, too heavy.

don't mess with the rear (yet); the boxster tends to get tail happy quick when you start messing with it.

also look at alignment - as much front camber as possible, keep rear about half degree less. the amount of adjustability (or lack thereof) will ensure that you won't get so much camber that your car gets darty or your tires start wearing funny.

i think when you say 'stabilisers' you mean strut braces which are different - they are there to keep the top of your struts from pulling apart under hard cornering - don't think you are there yet.

Thanks Ciao, if you read all my other responses, you'll see I want to move in baby steps for these items as I build up more seat time to improve the nut holding on the wheel.

Originally Posted by Ciao

Great question. For street use I like the S setup. There will be sacrifices in quality ride in street use when beefing up the suspension for track use. Other variables are how much money are you willing to spend and what street sacrifice are you willing to give up?

[steved0x]

Originally Posted by eicheldp

Thanks for the chart Steve. What should I assume that I would have installed on my car? The standard suspension for a 3.2L or the Sport M030 bar for a 3.2L?

If you look under your front trunk hood you should see a sticker with option codes, if you have the code 030 you have the sport suspension, and if not, you have the regular suspension.

If there is no sticker (for example there was a fender bender and the car got a new hood at some point) you could also look at the part number on the rear sway bar, it should be visible if you get down on the ground behind the car, and compare it with the part numbers on one of the sites with a parts lookup and diagrams.

[thstone]

Originally Posted by eicheldp

Just trying to improve myself and get off the bottom of the rankings.

I would suggest that your best investment is in yourself!

Find a competent driving instructor and then get as much seat time as possible. A purely stock Boxster is incredibly capable and there isn't much point in improving the car unless your driving skills can take advantage of the car improvement. In fact, it can be a hinderance.

The best gauge of progress is to track your lap times and compare to equal cars. If you're not at the top of that list, then its not the car that is holding you back.

I did around 25 track days before I improved my original Boxster beyond better brake pads and performance tires. You'll know when you are better than the car and when the car is what is holding back your performance. THEN upgrade the car.

I still follow this lesson to this day. Even after three seasons of racing Spec Boxster, I am not at the top of the leader board so I will continue to focus all of my efforts on improving my driving skills first and foremost.

[rastta]

Originally Posted by thstone

I would suggest that your best investment is in yourself!

Find a competent driving instructor and then get as much seat time as possible. A purely stock Boxster is incredibly capable and there isn't much point in improving the car unless your driving skills can take advantage of the car improvement. In fact, it can be a hinderance.

The best gauge of progress is to track your lap times and compare to equal cars. If you're not at the top of that list, then its not the car that is holding you back.

I did around 25 track days before I improved my original Boxster beyond better brake pads and performance tires. You'll know when you are better than the car and when the car is what is holding back your performance. THEN upgrade the car.

I still follow this lesson to this day. Even after three seasons of racing Spec Boxster, I am not at the top of the leader board so I will continue to focus all of my efforts on improving my driving skills first and foremost.

^^^^^This.^^^^^

[Topless]

Agree with Thstone. On a limited budget leave the suspension alone and run stock class. Mount the freshest tires that are competitive in your class, get a performance alignment to make the most of your contact patch, and get a top driver in your right seat for coaching. "Tuner" suspension changes will make no difference in lap times at this point. Always tighten the loose spacer behind the steering wheel before making changes to the car.

[eicheldp]

[/QUOTE]
I did around 25 track days before I improved my original Boxster beyond better brake pads and performance tires. You'll know when you are better than the car and when the car is what is holding back your performance. THEN upgrade the car.[/QUOTE]

Thstone, Topless, Rattan and Racer Boy,
Thank you for your advice. I think i'll save save some money to devote to lessons instead of parts. I hope I can get to the point where I can recognize that the car is holding me back. (Or that this old man lives that long )

One question, where is a good place to look for an instructor for AX? I reside in eastern PA.

[Topless]

I did around 25 track days before I improved my original Boxster beyond better brake pads and performance tires. You'll know when you are better than the car and when the car is what is holding back your performance. THEN upgrade the car.[/QUOTE]

Thstone, Topless, Rattan and Racer Boy,
Thank you for your advice. I think i'll save save some money to devote to lessons instead of parts. I hope I can get to the point where I can recognize that the car is holding me back. (Or that this old man lives that long )

One question, where is a good place to look for an instructor for AX? I reside in eastern PA.[/QUOTE]

Looks like you are in PCA Zone 2. Find an active AX region near you and contact their CDI. Let him know you are interested in improving your AX skills and would like to work with a qualified instructor. He will direct you from there.
AUTOCROSS « Porsche Club of America, Zone 2

[eicheldp]

Originally Posted by jakeru

I'm also just curious, what modification(s) did you make already which put you into SCCA Street Touring Unlimited class?

Jakeru,
The only modification I have made was changing wheel diameter and putting on some spacers and summer performance tires. I put it all in the thread below. Everything else is stock.
http://986forum.com/forums/boxster-racing-forum/67760-wheel-fitment-spacers.html
I went back to the SCCA classifications and I saw where my car is listed under STU class, but I also read the opening paragraph of the class that allows for suspension and engine modifications.
What confused me was the C street list of applicable cars, where it states "Boxster (986 chassis, all) (1997-2004)". It doesn't call out the S version specifically as they do for other classes for different models. I guess I'm in the wrong class.

Porsche
356 Carrera (4-cam)
911 (non-turbo, NOC)
911 Club Sport
914 (all)
928 (all)
944 (16v)
944 Turbo (all)
Boxster (986 chassis, all) (1997-2004)
Carrera 2 & Carrera 4 (964) (1989-94)
C Street class (CS)

Originally Posted by Topless

Looks like you are in PCA Zone 2. Find an active AX region near you and contact their CDI. Let him know you are interested in improving your AX skills and would like to work with a qualified instructor. He will direct you from there.
AUTOCROSS « Porsche Club of America, Zone 2

Topless,
I looked at the other regions listed on the link you provided, it seems that Reisentoter (my current chapter) is the most active for Autocross. I'll check within the club, but I will also check with the SCCA.
Thanks