Ohlins FGR 254

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Steven31371 said:
https://www.superbikeunlimited.com/...onic-suspension-bypass-kit-ducati-panigale-v4
You’ll need those if you take the electronically adjustable carts out and put in 108’s…mount them away from any heat sources, they are sensitive to heat. Also do not turn the bike on between unplugging the old fork electronics and plugging the bypass in, or it will pop a code that you can only get rid of by plugging the old carts back in, cycling the power on and off, then plugging the bypass’s back in before turning it on again. Doing it that way avoids some annoying juggling lol
Click to expand...

I have a non-S so I shouldn't need these as I don't have the suspension computer. I'll take the 108's apart when I get them to look at the design changes.
 
cl955 said:
Doesn't NIX30 refer to the cartridge, which is gas pressurised vs FKR which is spring pressurised? Putting FKR carts into an FGRT or a Showa fork is a big but expensive upgrade.

As you say, it's all about the internals.
Click to expand...

Yes you are right, but out of habit i call the forks for the V4S Nix 30 because I don’t think Ohlins named the forks other than a part number, they refer the the front forks on the V4S as their Nix 30, but really that’s just the internals. But that V4S Ohlins Nix 30 setup is compatible with essentially just dropping in the FKR 108 carts, or at least it’s a fairly straightforward swap between Nix 30 compatible forks with FKR 108’s.

In my particular situation there was no compelling reason to switch forks, rather than simply upgrade the internals. But there was a compelling reason not to. I wanted to keep my Sicom rotors WITH the Sicom pads paired to them. The FGR or WSBK forks all have the 108 mm caliper brackets, and the Sicom pads only pair to the 100mm Brembo calipers. I debated going full WSBK on the forks and brakes but I honestly think the Sicom brake setup is better (for me) for multiple reasons and wanted to keep that setup.

I don’t think I would have gotten a significantly better fork and internals setup by changing both the forks and internals. The Nix 30 equipped fork tubes on the V4S are actually VERY good, you just need to replace the Electronic Nix 30 internals to the FKR 108’s and you have a setup that in my mind is just as good or pretty much identical to the FGR 254’s that just came out. I suspect you might save a few grams on the lower caliper brackets on the FGR 254’s, but largely it’s not a significant upgrade over simply equipping the Ohlins OEM V4S tubes with FKR 108’s.
 
Ducati refers to forks as

PV4
Showa BPF

PV4S
2018-21 electronic NIX30 (non-pressurized)
22+ electronic NPX25/30 (gas pressurized to reduce cavitation)

PV4R
2019+ manual NPX25/30

They all have the same upper tubes and subtle differences in the cast lowers.

Ohlins FGRT 214/231 are basically a little better fork tubes (uppers maybe have different flex characteristics, lowers are CNC machined) with non-pressurized NIX30 cartridges. The FGR 250 forks have the FKR cartridges with spring pressurization (which is allegedly better bc you don’t have to worry about a gas canister leaking or having to replenish it) but up until the 254 you had to jump through hoops to make them fit. I don’t think there’s much of a difference in the valving between NIX30 and FKR. The only difference is +/- pressurization the FKR damping assembly is self-contained.

RVPs are just ridiculous and if you’re running these at anything less than top-level racing, you’re a douche.
 
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SuperDomestique said:
Ducati refers to forks as

PV4
Showa BPF

PV4S
2018-21 electronic NIX30 (non-pressurized)
22+ electronic NPX25/30 (gas pressurized to reduce cavitation)

PV4R
2019+ manual NPX25/30

They all have the same upper tubes and subtle differences in the cast lowers.

Ohlins FGRT 214/231 are basically a little better fork tubes (uppers maybe have different flex characteristics, lowers are CNC machined) with non-pressurized NIX30 cartridges. The FGR 250 forks have the FKR cartridges with spring pressurization (which is allegedly better bc you don’t have to worry about a gas canister leaking or having to replenish it) but up until the 254 you had to jump through hoops to make them fit. I don’t think there’s much of a difference in the valving between NIX30 and FKR. The only difference is +/- pressurization the FKR damping assembly is self-contained.

RVPs are just ridiculous and if you’re running these at anything less than top-level racing, you’re a douche.
Click to expand...

I don’t recall any hoop jumping to make the FKR 108’s fit the NIX30 V4S tubes…I could be wrong though as I had someone else do it.
 
SuperDomestique said:
The hoop jumping is to make the complete FGR 250 series fork work w the triples etc like someone mentioned
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Ahh yes, it’s whole process…triples, axles, bottom brackets etc…the FGR 254’s solve that now…if you have Showa forks the FGR 254’s are a good option if you want upgraded internals, but if you have the Ohlins Nix30’s on your bike you simply need to drop in the FKR 108’s, save some money, and have almost exactly the same setup as the FGR 254’s that will not require different sized triples, axles, calipers etc.
 
The 108's are 25mm versus the 30mm Nix. I found a parts diagram for the 108 cartridge. It looks pretty different from the Nix valving and the cartridge requires more careful set-up if you read the service manual. The standard cartridges are a just kind of screw it together thing. The 108's require you to set up the springs in the cartridge and I think there's some subtle adjustments that are above my pay grade. They claim reduced friction with the 108 style cartridges which is probably mostly due to the fact they're 25's.
 
baggerman said:
The 108's are 25mm versus the 30mm Nix. I found a parts diagram for the 108 cartridge. It looks pretty different from the Nix valving and the cartridge requires more careful set-up if you read the service manual. The standard cartridges are a just kind of screw it together thing. The 108's require you to set up the springs in the cartridge and I think there's some subtle adjustments that are above my pay grade. They claim reduced friction with the 108 style cartridges which is probably mostly due to the fact they're 25's.
Click to expand...

Makes sense that friction is less with the smaller diameter piston. Win-win. But the damping is the same basic principle. The valving is just located within an isolated damping unit that’s pressurized by a spring. Sure there’s a bit more complexity and nuance with the pressurized system. I saw them when visiting Kyle Racing a while back when I got the tour of the place. Even asked if it’s worth going FKR and for street/track day riding was recommended just the NIX30 carts. I had an open wallet.
 
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SuperDomestique said:
Makes sense that friction is less with the smaller diameter piston. Win-win. But the damping is the same basic principle. The valving is just located within an isolated damping unit that’s pressurized by a spring. Sure there’s a bit more complexity and nuance with the pressurized system. I saw them when visiting Kyle Racing a while back when I got the tour of the place. Even asked if it’s worth going FKR and for street/track day riding was recommended just the NIX30 carts. I had an open wallet.
Click to expand...

I bought some WSR manual adjusters for the S forks so I'm going to try the Nix first for the same reason. I probably wouldn't be able to tell the difference sans slicks.
 
howdy,
any long term review here from 254 owners? I'm in the market and need some convincing......!
 

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