- starting to think about suspension
- started doing a search on the 996gt3 board
- maybe this could be useful (maybe not) but if you have some details maybe you can help fill in some of the data and if you have aftermarket suspension with particular spring rates, hopefully you can add your data

car front rear
stock 996gt 228# linear 543# progressive
kw 997gt3 285# linear 970# linear
typical moton 996gt3 450/600# linear 600/800# linear


anyone have any other data and feedback on how the car handles?


paul

 

might try heavier in the fron than the rear may surprise you

 

Interesting numbers you posted. FYI although it might seem that you would want spring rates proportional to the weight in the front and the rear so that the front and the rear have the same stiffness this also gives the front and rear the same resonant frequency which means the car will tend to pogo stick forwards and backwards. Not a good thing. The weight ratio is 38/62 and your data shows setups either front stiff or rear stiff relative to that ratio.

 

- found this thread which is very useful

https://rennlist.com/forums/racing-and-drivers-education-forum/289596-spring-rates-and-other-musings.html

- on page 3 (post #34), i think the understeer section perfectly describes the 997gt3

paul

 

Paul, I went through this very thought process when I got the suspension for my C2. I found it odd that Moton and JRZ would suggest spring rates with a pretty consistant 200-300 lb split in rates no matter how high or low the rates were, whereas the rest of the aftermarket community seems to increase rates but keep the ratio similar to what comes stock on a GT3 as far as front to rear split. (ironically stock 996 C2 rates have <100lbs of split) OF course this was all 996 based info and as i understand it the 997 -3's understeer a bit more than the '6's did.

You have to figure that the Moton and JRZ folks know what they're talking aobut as most of their customers are going to be using the product pretty heavily on the track, however I couldn't justify the expense for my car in the end based on a variety of factors and opted for an off-the-shelf solution in H&R's clubsport coilovers. They have 450/915 spring rates and on my car I've found that it's very neutral with this setup and I can dial in understeer or oversteer based solely on sway bar adjustments. (shocks are not adjustable on this setup)

However, you cannot ignore racers like JimB who ran at the front of the pack with the 200-300 lb split that Moton and JRZ suggest for their dampers. Not to mention you'll have endless technical resources to bounce ideas off of with the Motons or JRZ's and spring swaps are easy and common with those setups to find the magical balance for each individual car/driver comob. Can't say you'll really get much help in that department with a KW, H&R or Bilstein setup if you find that you've tweaked and tweaked and still cannot find the feel you're looking for.

Andy

 

Andy,

thanks for the note


Paul