F355 shock rebuild

Good to hear, I would like to have mine rebuilt, while it is still possible.

 

cool did you go with the normal 90 day warranty or the limited lifetime? If the current shocks have lasted 15+ years without needing a rebuild I wonder if it's worth going with the lifetime warranty.

 

Is the lifetime warranty transferable? If it is, that would add value to the car and thus be an additional reason to pay the extra dough.

 

Good to hear nsx, I have been wondering if the overly soft front end on the 355 is worn shocks, or ferrari pandering to hair gel enthusiasts like myself.

 

Great pic ^^^

 

Thank you so much for posting this thread!

And thanks for the other positive comments by other posters; as a result of this thread's suggestion that we honor our Limited Lifetime Warranty for subsequent owners we've officially changed our written policy. Our warranty is now transferable. Please retain your Invoice from us or your technician showing the date and type of service so the next owner has the documentation.

We've honored our warranty this way in the past as good will but never changed the wording on our website; so thanks for the kick in the bu** for me to publish the change!

Also, to nsx2F355, you have our Limited Lifetime Warranty service for your shocks, work done by Precision European Auto Repairs in SLC.

Best,
Rob

 

Wheel rates on the F355 are quite soft (90 lbs/in front, 190 lbs/in rear WHEEL Rate, with 185 lb/in and 260 lb/in SPRING rates, respectively), plenty of room for improvement without degradation of ride quality. That's about a 20% difference in ride frequency, IMHO to guarantee understeer in most conditions.

Best,
Rob

 

I'm seriously thinking of having my shocks rebuilt, not so much because they are leaking or broken, but to tune the suspension and get rid of some pretty serious under steer. I'd also like to firm up the ride, as I think it is too soft, even in sport mode. Can this be done?

I am also told that my car came with challenge shocks but with stock springs, but I feel it is still soft and handling could be improved. I am also told that it has a challenge front sway bar, no mention of the rear so I assume it is stock. This could also be why it under steers? I'd like to verify this; do you know the diameters of the stock and challenge sway bars?

How much for the shock rebuilds, and the turnaround time? You can PM me with that info if you prefer. Thanks in advance.

Cheers.


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Yes.

It understeer because Ferrari wants it to be safe... Yes, in theory the lager Challenge front ARB combined with OE rear ARB would contribute to understeer, but ride height, rake, alignment, tires and driver input can also contribute to understeer.

I have published F355 Challenge ARB specifications here on Fchat but searching on my phone is difficult.

$400 each with our Limited Lifetime Warranty.

We like to schedule your service to minimize turn around time. We have openings after Jan 20th. With careful scheduling we can turn them around in a few days.

To build a custom system for you is at least a week.

Best,
Rob



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Thanks for keeping this thread updated. My 355 could use some firming up even in Sport mode, especially when I drive it on the track

 

Thanks for posting, reminds me I need to do my service. will contact you

Happy New Years

 

Standard sway bar diameter is 22 mm front and 17 mm rear. Challenge sway bars are 2 mm thicker, 24 mm front and 19 mm rear. Accessing the front bar for measurement is not easy.

 

So is it possible .... along with the rebuild, to stiffen the damping rates?

 

Yes, revalve during rebuild is an additional $40 each shock...

What you really want is a spring change with revalve. Why? Dampers are most influential during corner entry and exit, dampers can influence balance but cannot change balance (understeer / oversteer). Dampers are timing devices, controlling rate of load transfer.

Of course we can simply revalve and the car will certainly feel more sporty, but not like a revalve with springs.

Thanks!

Best,
Rob

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Thanks for the info!

HNY!

 

Do I understand correctly that new spring perches would have to be supplied if the springs were replaced with stiffer ones? If so, what is the cost of that conversion? What type of springs are used to change the rates, Eibach ERS, Hypercoil, or similar? I haven't made any measurements, but aren't the diameters of these springs the same as the OEM springs?

Would you be able to recommend settings, valvings and spring rates so I may achieve my handling objective?

Thanks in advance,

Alex

 

"It depends"...

The spring rate vs the corner weight and installed height determines packaging, thus determines if we must use a tender spring or not and determines the spring dimensions. This weighs against cost. Then cost vs performance and the goal of the driver.

For example our F355 sport suspension uses 2 - 1/2 inch ID Hyperco or Eibach springs and tenders, thus a upper and lower mounts change (using our spherical monoball mounts).

Though we can build a system with lower spring rates that can use all stock spring mounts, it's a different spec, the compromise is lower cost demands lower spring rates.

Confusing, sorry... It's taken me 20 years to understand this stuff, haha...

Best,
Rob

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Rob,

Do the owners that buy your sport suspension package generally upgrade the sways to challenge specs or leave them stock? Just wondering how much of a trade off there will be between sharper handling and ride quality (ie I don't want to shake my molars out on a bumpy road).

 

Does Tokico or Koni not offer shocks for these cars?

 

They don't typically, mainly due to ROI, they're expensive.

I have posted sizes as well as effective rates here years ago. Search on my phone is very difficult.
Bang for the buck is our suspension conversion using your dampers. Our "FHP inspired" system is $3,200.

Best,
Rob

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