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I searched around and tried to find out about the Wilwood dynapro honda/acura calliper kits and the dynalite
the dynapro come in a direct bolt on for my 99 em1 but I'm worried because of the new size of piston area that my pedal height will go down? does anybody have experience on this? and what are the major differences if any between the two? which one weighs less? and which calliper would keep a more factory feel to the pedal.
There's a sticky for brake upgrades. You can use your stock calipers and just upgrade your lines, fluid, pads and rotors. Just because you go turbo doesn't mean you have to upgrade to wilwood brakes.
Not sure if you're still looking at this, but Wilwood's piston size data is right on the website:
Stock Si caliper are 54mm (~2.12") diameter (as far as I could find with a quick search),
so pi*(d/2)^2 = pi*(2.12"/2)^2 = ~3.53in^2
4.12/3.53 = ~1.17, so you're looking at about a 17% increase in piston area. I'd say yeah, you're going to have some more pedal travel since you have the same amount of extra volume to fill.
I'd be more concerned with what that's going to do to your bias, but there's more to that equation with consideration for pad area & compound, whether or not the car is lowered and with what spring rates, tires, etc. etc....
If someone else has confirmed piston size on the Si caliper, feel free to correct me. I thought I had 57mm in my notes somewhere but I can't find it right now. That would reduce the difference to around 5%, which is negligible when you factor in all the other variables.
Not exactly. Piston sizes are different iirc. You should be able to find the data if you look hard enough. Check rockauto, etc, for replacement pistons and read the descriptions for measurements.
You may have to dig, but if you're crafty the data is all over the place.
Not exactly. Piston sizes are different iirc. You should be able to find the data if you look hard enough. Check rockauto, etc, for replacement pistons and read the descriptions for measurements.
You may have to dig, but if you're crafty the data is all over the place.
10 years worth of digging through old archived threads... **** gets old lol. So many good threads that are in the FAQ's around here and lots of the pictures are missing, some of the links are dead.
Wow very good information thanks for the help. My car is completly stock all original sir ebp with 84k miles I'm thinking about maybe keeping it all original. I figured the pedal feel would go down a bit. Let me know when you get that kit on how it works and feels
Not sure if you're still looking at this, but Wilwood's piston size data is right on the website:
Stock Si caliper are 54mm (~2.12") diameter (as far as I could find with a quick search),
so pi*(d/2)^2 = pi*(2.12"/2)^2 = ~3.53in^2
4.12/3.53 = ~1.17, so you're looking at about a 17% increase in piston area. I'd say yeah, you're going to have some more pedal travel since you have the same amount of extra volume to fill.
I'd be more concerned with what that's going to do to your bias, but there's more to that equation with consideration for pad area & compound, whether or not the car is lowered and with what spring rates, tires, etc. etc....
If someone else has confirmed piston size on the Si caliper, feel free to correct me. I thought I had 57mm in my notes somewhere but I can't find it right now. That would reduce the difference to around 5%, which is negligible when you factor in all the other variables.
First, 2 year old thread bump. Got it.
Second, calculation error. (Reason for the bump.)
I'm looking at the Wilwood DPHA calipers so this information is relevant to me and most likely others.
All Integra front pistons are 57mm.
However, the Si piston size of 54mm or 2.12in is the example. When divided by 2 (2.12/2) it should have been 1.06. Take that by Pi and it should be 3.33, not the 3.53 that was calculated.
54mm piston area;
3.14(2.12/2)^2=3.33, not 3.53
4.12/3.33=1.23 or 23% larger piston area.
57mm piston area;
3.14(2.25/2)^2=3.53
4.12/3.53=1.17 or 17% larger piston area.
Since all Integras share the same piston size (57mm) you're not increasing your area by ~5%, but ~17% while the guy with the Si is increasing by ~23%.
09-19-2014, 06:07 PM
Wilwood brake callipers for em1
