355 Fiorano Handling Package Vs Challenge Suspension ECU.

Image Unavailable, Please Login @601 According to the WSM, I calculated standard spring rates are designed to be approximately 185 lbs/in for fronts and approximately 260 lbs/in for the rear.

With slightly more than 15% increase, you arrive at 215 lbs/inch in the front and 300 lbs/inch in the rear.


Standard front springs are 12.5 inches. Standard rear springs are close to 10 inches.

 

https://www.nakamuraengineering.com/report/フェラーリ-f355%E3%80%80定期チェック/

FHP car.


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512 TR hogging up all the springs we need

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More info on 150415 progressive rear springs.

Length: 10.32 inches

Rate: 297 lbs/in. If my calculation is correct. I hate deciphering euro numbers .


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The rears appear to be accurate. We just don’t know enough about the Fiorano fronts to make a comparison yet. Lots of info/specs on the rear since it is a 512 TR spring as well. Fiorano front is a bit of a mystery as I can’t find any info on them outside of pics. However, I might have a lead on an original brand new pair.

 

Lol. Funny you mention this because I was just talking to Ferrparts today about verifying a 512 TR spring they have for sale.

https://www.ebay.com/itm/Ferrari-512-TR-512-M-355-Rear-Leaf-Road-Spring-151882-/110928695196?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0


They have the part number of a 512 TR linear spring listed , but picture obviously shows progressive springs. If we’re lucky, they might even have 4 of them . Waiting on pics from them before I jinx it.

 

Unobtanium has been obtained. These have been sitting on the shelves since 2000?

Fiorano front springs.

Length: 285mm or 11.22 inches. So approximately 1.25 inches lower than standard front springs (12.5 inches). And probably 1 inch taller than Superformance’s version of “Fiorano Springs.”

Spring rates: TBD .
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Interestingly enough, I assumed these springs were produced by Eibach, but it does not say Eibach anywhere. The standard OE springs actually have an Eibach logo.

A.Cagnola Monza?

https://www.mfg.com/manufacturer/mollificio-angelo-cagnola-spa-monza-lombardia-769286/

 

I'm glad we got that cleared, so there's no speculation. I tripple checked and the Fiorano front springs are 285mm right on the dot. 11.22 inches.

I feel 11 inch (front) is a good length between the super low H&R Front springs (10 inches?) and super high standard springs (12.5 inches.) You should be able to set the front ride height to everything but dumped. Well thought out Ferrari .


Did we ever put those Superformance springs on a tester?


I'm having the Fiorano springs currently dropped off at Swift Springs local here. They have a very accurate tester.

 

I’m still on the hunt for a challenge front roll bar. Any leads would be appreciated. New or used.

 

According to my best judgment with a standard ruler, spring diameter is 103mm. Coil diameter. is 12mm.

In the same token, my ruler measures the standard coil diameter at 11mm, while the WSM spec states it is 11.5 mm. Safe to say my ruler shows Fiorano coil diameter to be 1mm more than the standard spring. It’s noticeable when you put them side by side.


So try 12 or 12.5mm for coil diameter.

 

Not sure how accurate my scale is but Fiorano springs weigh in at 5.2 lbs. Standard springs weight 4.8 lbs.



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@601

I came up with 249-250 lbs/inch. Watchu got?

I used “9” active coils for each one.

 

I’m confused by what to plug in for “active coils.”

I put the springs side by side in the exact same coil position and it appears the standard spring has 1 more coil.

If I use 8 coils for Fiorano spring and 9 coils for standard, I’ve gotten as high as 280 lbs/inch.


It also appears the spring rate calculation is very sensitive to even .5mm wire/spring diameter differences. I’ve plugged in different combos and have gotten anywhere from 238-281 lbs/inch.

Only way to know with certainty is to measure the spring on a tester. Heck, maybe I should measure the standard spring at the same time.

 

@601

I’m seeing a full coil more on standard vs Fiorano.


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I really should measure both at the same time. There is one X factor. The Fiorano spring is new, the standard spring is 30k mi old.