NSX Calipers


I bought my first set of NSX calipers n 2004 and used them under many sets of 15" alloys with 282 disks with no problems. Wish i hadnt sold them :(

Rach x
 
I used legend calipers, brake feeling was good but the drivetrain felt heavy and not precise.

I prefer EK9 calipers with agressive pads.
 
I have NSX calipers on my crx and on my itr - I love them!

And as Rachel said they will fit under most 15's too!
 
I maybe wrong but i am sure accord type r are the same as NSX ones without the NSX logo.
 
No they are not, ATRs are a fair bit more powerful.
 
I notice an incredible amount of dicking around with brakes in the Honda community without any regard to the effect of this.

Theres some really important concepts to get hold of before messing with brakes for the sake of your own safety!

Let me be clear here specific to the EK9:-

The NSX calipers will have a lower piston area than standard which will reduce brake force at the front. Shifting brake balance to the rear is dangerous! You'd be reducting front braking to exactly 75% of the original. I've done the calc.

The NSX caliper is designed for 28mm disks. What are ek9, 23mm?
If you run them and let the pads get low you are likely to seize the piston in the bore...which is (you guessed it!) dangerous.

The general trend in tuning communities is to increase front braking which is not especially dangerous but will INCREASE the overall stopping distance of a car.

If you insist on running NSX calipers you'd ideally need to source 28mm thick disks and reduce bias to the rear - perhaps by running slightly more aggressive front pads, though this is still something of a bodge fix.

- Oh! And technically your master cylinder is then too big - You'll find the pedal a bit underservo'd compared to standard.
 
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In addition ATR calipers have 'close enough' piston sizes to be directly compatable. The disks are still 28mm though, so not ideal.
 
Good stuff John. FWIW though, a bit of additional rear bias is good for braking performance, the same way as additional front bias hurts performance. How much, that's the question. Obviously with front bias you don't run in to big safety concerns if you go too far, where you obviously do with too much rear bias.

Unfortunately there is zero information on Honda's prop valves, so no-one can ever calculate what the bias is exactly, it's all done on trial and error.

Also, I make the NSX brakes 90% of the EK9s, not 75%.
 
I fitted my Legend calipers with legend discs and 2.3mm spacers behind calipers. No problem at all, the only problem is discs weigth compared to EK9 discs.
 
Kozy said:
Good stuff John. FWIW though, a bit of additional rear bias is good for braking performance, the same way as additional front bias hurts performance. How much, that's the question. Obviously with front bias you don't run in to big safety concerns if you go too far, where you obviously do with too much rear bias.

Unfortunately there is zero information on Honda's prop valves, so no-one can ever calculate what the bias is exactly, it's all done on trial and error.

Also, I make the NSX brakes 90% of the EK9s, not 75%.
Click to expand...

From google:-

91 NSX Spec's
Caliper
Piston(s) Size: 34mm and 36mm

EK9 is 57mm? (54mm for EK4)

Squares of radii (summed)
613 (NSX)
812.25 (EK9)

613/812 = 75%

Agreed that OEM rear bias is low for safety - but I'd not want to increase it much generally!
 
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We're talking about upgrade to a civic here - so the wheel diameter, and even second moment of area is constant, we'd have to assume the same pad material, and both would be 282mm disks (and disk diameter only typically makes 2.5% difference per 10mm increase).
The only other variable is the radial distance from the hub that the centreline of the pistons acts at, but its going to be very close in this case.

Basically piston area is the only significant factor.
 
That'll be it then....

I got it from here

Brakes, please help explain Caliper sizes

NA2 has 34/40 though according to the NSX Wiki?

- Otherwise it looks like linked thread was wrong. 90% is still a *bit* of a worry though. Think i'd be stepping the rear pad down a compound. Ie running DS3000/DS2500 front/rear.
 
So to some it up after all the calculations ek9 calipers apply the most force to the disc?
 
Yes... but thats not a good or bad thing.

You just have to consider the whole brake system before changing any individual components, or you risk "fixing it worse".

The main pitfall is fitting great big bloody 6 pots or something on the front and making your pedal spongy and your rear brakes do nothing.
Fitting just the 282mm front brakes to an EK4 would be a prime example.
 
JohnTurbo said:
Yes... but thats not a good or bad thing.

You just have to consider the whole brake system before changing any individual components, or you risk "fixing it worse".

The main pitfall is fitting great big bloody 6 pots or something on the front and making your pedal spongy and your rear brakes do nothing.
Fitting just the 282mm front brakes to an EK4 would be a prime example.
Click to expand...

I did that. It was ****. I removed them again. :nono:

90% is fine. Did you check out the link I posted?
 
Yeah. Very clever. Unsure about the 4" of pedal travel?! But the heat is a nice idea and simple to work out in terms of ke.
 
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