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Discussion Starter #1
Goodwin Racing seems to be having favorable results with these springs and Koni shocks. Question is with the Abarth and the Bilsteins. How do they compare to the Konis and how balanced would they be with these springs?? Seems a shape to pay for the Bilsteins and then just toss them. Goodwin Racing...any thoughts?
 

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Information from autoricambi.us page
"Lowering spring set by Progress Technologies - These will lower the car about 1" (25mm) - Lowering the car improves handling by reducing weight transfer during cornering - These springs are stiffer to avoid bottoming out, but still provide a good ride for street driving - Powdercoated metallic gray"
 

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Those springs work well on the Bilsteins. The Bilsteins are over damped for factory springs, so many will find the result even rides better than stock.

What the KONI SPORT shocks add is more control...and more lowering. The KONI are twin tube, lower pressure than stock Monotubes. Result is an ADDITIONAL half inch of lowering when the KONI are used instead of the Bilstein shocks. Using the KONI also gives control over balance front to rear for both ride and ultimate balance at the limit (in autocross we can quickly tame oversteer with old tires by dialing front stiff and rear soft, etc).
 

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When we installed the progress springs, we noticed better handling, slightly firmer ride, not harsh. They work well with the stock shocks. Auto Ricambi also has Koni shocks for this application.

If I were going to do only one mod, it would be springs to get the car a little lower and tighten up the handling a bit.
 
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Discussion Starter #5
Those springs work well on the Bilsteins. The Bilsteins are over damped for factory springs, so many will find the result even rides better than stock.

What the KONI SPORT shocks add is more control...and more lowering. The KONI are twin tube, lower pressure than stock Monotubes. Result is an ADDITIONAL half inch of lowering when the KONI are used instead of the Bilstein shocks. Using the KONI also gives control over balance front to rear for both ride and ultimate balance at the limit (in autocross we can quickly tame oversteer with old tires by dialing front stiff and rear soft, etc).
You mentioned the Roadster Sport version was "okay" with the Bilsteins. Can you elaborate? Or are the the standard ones the way to go for street and occasional autocross.

Thanks
 

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Here is the Auto Ricambi Spider with the Progressive springs.

Same car before and after.

 

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You mentioned the Roadster Sport version was "okay" with the Bilsteins. Can you elaborate? Or are the the standard ones the way to go for street and occasional autocross.

Thanks
Our regular Progress Springs are the way to go for regular street driver. They will do autocross better than the stock setup but don't expect to be winning events, they are still relatively soft, designed to be well within the damping control of the stock shocks and comfortably lower the car.

If Autocross is really in the plans, then our higher rate 300/200 RoadsterSport Springs is a far FASTER setup. They do work 'okay' with the Bilsteins but you lack any control over final balance, they were really designed to shine when used with the KONI and they are pure magic with the KONI. We worked with KONI from the start of the RoadsterSport Spring project, we had shock dyno info early and worked with their engineers and exchanged info on rates, etc. Result is a combo that can do a lot more than just show up and have some autocross fun..it actually crushed the field at first event we ran the setup. Normally you need a set of coilovers with much higher spring rates to get Top Time of Day at our events here with so many fast competitors, including numerous national champions. I turned Top Time of Day despite hitting a cone on both my fast runs, which means my time was MORE than 2 seconds faster than all competitors, which is all day by autocross standards. One of our younger drivers, Sean, jumped in our Fiat for exactly one run, had never driven the setup before...and turned a top five time, that's just how good the setup can be when the shocks and springs are a carefully matched combo and enough rate so you can push the car without being on the bumpstops. And ride quality is still great. This setup is more serious than most need or want, it's for the guy who wants to be fast in the canyons, fast on track, fast for autocross...and yet does not want to lay down the serious coin for something like our Ohlins coilovers. Sean below on his one run....he came back with a big silly smile, a top five time, and telling me he this setup would be his choice for a daily driver Fiat 124.

 
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