Thread: b13 11" wilwood (BABK science)

Okay, not sure if I'd ever want to run the wilwood setup but I am a bit confused. I read through Tokes thread on his setup and it seems like nothing was ever actually...confirmed? haha

Anyways.. Question is, for proper proportioning, do any OEM master cylinders and rear calibers even out the bias setup?

My current setup is NX front's, Maxima rears and altima MC with SS braided lines so I'm not to worried about changing it up considering I use the car for autox. Just looking to unrattle my brain!

Paxton

In my opinion, yes.

Here's my take on it:
http://www.sr20-forum.com/529528-post17.html

That entire thread is a good read.

I know my post there doesn't reference the Wilwood setup specifically... Let me touch on that in another post.

Continuing on from my previous post on master cylinder proportion and piston size...

From what I was told by Brian at Fastbrakes about the 11" kit is that if you were upgrading the fronts to the 11" kit on a B13 SE-R then you did not want to upgrade the master cylinder to one with different proportioning because the larger volume of the 4-piston calipers up front roughly work out to couter-act the additional stopping power they provide. This is Brian's advice anyway, and I know it sounds a bit far fetched and maybe a bit of marketing mixed in there, but he's at least on the right track.

There may be room for improvement. In my opinion a larger piston to shorten that pedal travel again is likely in order, but the brake bias is not something I'd mess with lightly. The B14 master cylinder should have a larger piston, but the same bias as the B13 master cylinder, so it would be worth looking into. If you find you would like more rear bias, then the NX2k master cylinder should be your next choice. Unless you want to go with a dual MC setup and a balance bar.

The real answer is to upgrade the rear brakes too, and then get the Altima master cylinder to round it all off. It might not be perfectly balanced, but it is supposed to be quite good.

Hmmm, I feel like he's basically saying. Yeah you'll have the look of a nice brake system and the sloppy pedal of an unbled system. I'd think if you were putting 4 piston brakes on, that you would want the full effect of the $$ you spent on the system.



I'm assuming the NX2k MC is bigger than the Altima? Also, I haven't heard of a dual MC setup, to google I go!

It'd be nice if we had check valves in or MC's (unless some of em do?) that way you could adjust the pressure and the need for a bigger piston MC wouldn't be needed. There's also the adjustment of the Brake booster that could fix a sloppy pedal.



What rear brakes? It'd be nice if we had some two piston rear brakes to throw on? There'd be less proportioning that needed to be done that way. I wish someone could machine a front and rear proportion valve for this type of system haha

Also been, I feel like you're saying that the MC deals with proportioning? It's a little misleading I'm not gonna lie.

The stock brakes can already lock up the tires. The real gain of the larger setup is the fade resistance, and you get 100% of that, squishy pedal or no. Additionally, I don't recall having too bad of a pedal with just the 11" kit up front and stock MC. I don't even know if I could tell the difference in travel.

The piston size? I don't think so. I think the Altima is larger.

They are very common in racing, and we actually have a forum member who posted about his setup here recently. It might move you to a different class though?

The Maxima rear brake upgrade. Or the G20 rear upgrade. Same thing basically. Larger diameter rotor, a bit thicker too, and larger pads. Still single sliding piston and e-brake capable.

Yes, I've not made the distinction between the master cylinder, and the installed proportioning valves. So few people mix and match those, I've been staying out of that kind of detail.

I haven't raced in a year or so, forgot about this haha. Seems like whenever I get done with a run, I'm about to hit the car in front of me in the staging lanes. The reminder helped clarify, thanks.




A good addition to the wilwoods I'm assuming.



This is probably more for peoples taste, how they want their brakes to feel. Just a question, what valves have you heard of people swapping and testing?

Absolutely.

I only recall one thread with one person. I couldn't find it when searching just now. I'll try some more.

I did find the balance bar setup. I is Vector on his rally car build.
http://www.sr20-forum.com/701736-post142.html

I went with the U13 MC with G20 brakes in the rear w/ the 11" wilwoods and I have no complaints. I personally liked the nx fronts and maxima rears w/ u13 m/c a little better... in my opinion it's still a little bit front heavy w/ the wilwoods, but it definitely stops well. BLEED THEM WELL!!!!

Because of my stupid ABS, I'm still running the OEM MC on my car with Wilwoods up front and the maxima upgrade in the rear. The U13 ABS MC didn't fit, so I had to cancel my MC upgrade plans until I can get in and remove all of the ABS stuff. But speaking of proportioning valves, this thread could be a start:
B13 rear brake upgrade install (PICS) - SR20 Forum