Would you choose a V4R or SP2 for trackday use?

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Worst 600 miles were breaking in the V4 with full undertail exhaust. Uncomfortable but the noise at that RPM was crazy loud! Head buzzed for a week.
 
Kev242 said:
Worst 600 miles were breaking in the V4 with full undertail exhaust. Uncomfortable but the noise at that RPM was crazy loud! Head buzzed for a week.
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Snuggly said:
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Had my trusty 3Ms in my ear, didn’t do .....! 🤣
 
panibadboy said:
For 30mm stylema pistons they are. And you are just spreading false info
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You were talking about master cylinders, which are not identical, and now you’re talking about calipers, which are not identical.

The master cylinders are both a 16mm piston but they are not identical master cylinders.

I’m not sure why you’re making an issue of it, other than you don’t like the SP2 for some reason. 🤷‍♂️ I am not spreading false info - I am stating facts.
 
Depends how you look at things.

The piston diameter is the same for master and caliper of base/S/R/SP2 so actual stopping power is the same. 16 mm MC mated to a 30 mm caliper piston is always going to give the same hydraulic pressure. The only difference is lever pivot and feel/modulation.

Vented pistons won’t change the hydraulic ratio.
 
SuperDomestique said:
Depends how you look at things.

The piston diameter is the same for master and caliper of base/S/R/SP2 so actual stopping power is the same. 16 mm MC mated to a 30 mm caliper piston is always going to give the same hydraulic pressure. The only difference is lever pivot and feel/modulation.

Vented pistons won’t change the hydraulic ratio.
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It doesn’t depend how you look at things. The master cylinders are not the same - one has lever ratio adjustment and the other doesn’t. The comment made was that they are identical - they are not. It’s that simple. 🤷‍♂️

Whether it makes any particular difference is a different question, although with the SP2 master cylinder you are getting 16.19, 16.20 and 16.21 - with the R you get 16.21. Not identical.
 
spooky said:
Whether it makes any particular difference is a different question, although with the SP2 master cylinder you are getting 16.19, 16.20 and 16.21 - with the R you get 16.21. Not identical.
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What leverage ratio are you running on your SP2? If it’s 21, then it’s identical.

If you’re running the LR at 19, your lever travel is going to feel even more spongy but has more modulation
 
SuperDomestique said:
Depends how you look at things.

The piston diameter is the same for master and caliper of base/S/R/SP2 so actual stopping power is the same. 16 mm MC mated to a 30 mm caliper piston is always going to give the same hydraulic pressure. The only difference is lever pivot and feel/modulation.

Vented pistons won’t change the hydraulic ratio.
Click to expand...

Mechanical (hydraulic) advantage includes the lever pivot. You could have any combination of piston and lever pivot length which would give the same volume displacement and it would feel the same. Regardless of master the clamping force corresponding to braking force remains the same. Only your perception of that force being applied is changed. The problem with the SP2 master is it going from soft 16/21 to softer 16/19. WTF who thot that was a good idea.
 
baggerman said:
Mechanical (hydraulic) advantage includes the lever pivot. You could have any combination of piston and lever pivot length which would give the same volume displacement and it would feel the same. Regardless of master the clamping force corresponding to braking force remains the same. Only your perception of that force being applied is changed. The problem with the SP2 master is it going from soft 16/21 to softer 16/19. WTF who thot that was a good idea.
Click to expand...

It’s certainly an odd choice - start with soft but with the option to set it even softer…
 

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