Thread: Why not another group buy on Hypercoils

I love my B14 hypercos. They are really good on the ride, but firm in the corners. So firm in fact that I deleted my front sway bar. Car handles very well. Says a little about the quality, but I dont think I will be "upgrading" from here. I'm happy with the overall performance package. Very happy.

Sign me up for a set of B13 springs. Thanks for trying to organize this deal. I hope it goes.

Updated total is 10 so far with 11 sets total, I would like to get at least 20+ people on this forum committed to buy since I think almost everyone here will pay. From there we can target other forums to get the additional 20-30 people we need. I can see a scenario in which we make it so if you are on the fence with this then get in the game. From everything I have read these are the BEST springs for the Nissan B13s. This would be the 5th or 6th generation of these springs so it would not be a bad idea for owners of other springs to get them as well.

Nice to see all the interest, and the timing is on the money, as Rick Crist and I have already been speaking about a new group buy last week. We've got some work to do on our end, and we're both keeping an eye on this thread.

Nope, not even close, sorry. B13 front springs can be used on the front of a B14, but the rears are completely different. Stick your head under a B13 & B14, and it'll be immediately obvious that they're not interchangeable.



Thanks for getting the ball rolling, Jamanrr. Actually, it will be for Gen2 B13 springs.

C

Is the NX spring actually shorter? I could run into some serious issues here soon building my CSKs...



Thanks for your time Rick and Chris. I am curious about how the commonly quoted 300F/200R lb/in rates are calculated on the progressive springs? I am building multiple sets of CSKs specifically for B13 Hyperco Gen 2s, and have been studying the different damping options. I assume that over-damped rebound on Hypercoils could cause incomplete expansion on bumpy road due to the progressively smaller spring force?

Should I be shooting for under, critical, or over-damping with these springs? From the quick calculations I did, it appears an NX with Hyperco Gen 2s would see critical damping at 13 in/sec around Ccrit = 975F/610R. I also started modeling each with a differential set up as an initial value problem using the data from Koni and came up with similar numbers, which makes me think that the B15 Koni Yellows may be a bad choice for Hypercos since the minimum rebound is twice that of the b13 Koni Reds.

I am also confused why the B15 stock spring rates are lower in the front given a similar weight distribution to the other b-chassis? Just a product of other differences in suspension geometry?

Sorry for the long post, and thanks for any input.

Koni info:
B13 red REAR insert:
min rebound: 500 newton meters @ 13" per second
max rebound: 1000 newton meters @ 13" per second
compression: 300 newton meters @ 13" per second

B15 yellow FRONT insert:
min rebound: 1050 newton meters @ 13" per second
max rebound 2100 newton meters @ 13" per second
compression: 450 newton meters @ 13" per second


B13 Hypercoil springs
300lb front / 200lb rear
1" to 1 1/2" drop


B13 - NX2000

curb weight = 2,509lbs

Weight dist, f/r, %....63/37

front weight 1580.67 = 716.98 kg

per front wheel = 1580.67 / 2 = 790.33500 lbs

rear weight = 928.33lb

per rear wheel = 928.33 / 2 = 464.16500 lbs


B13 SE-R

curb weight = 2414

weight distribution 62/38

front weight = 1496.68

Per Front Wheel = 748.34

rear weight = 917.32

Per Rear Wheel = 458.66


B15 Sentra SE-R spec-v

Curb Weight:2,710 lbs

Weight Distribution F/R :62/38

stock spring rates = 154F/247R (2002+ Spec V)

front weight = 1680.2 lbs
per front wheel = 1680.2/2 = 840.1 lbs

rear weight = 1029.8 lbs
per rear wheel = 514.9lbs

Chris, what do you normally keep your AGXs set at in your NX? I remember your NX having the best feel of any b13 I have ridden in.

I would like to see the b13 rear springs with a higher rate like that of the b14 springs, but you guys know better than I. Here is some interesting info you posted in a previous group buy:

Man, when was that, on the way to the PA convention? I probably had them at 1f/2r which is where I typically ran them on the street. That car is long gone, as is most of my memory.

I'm far from a suspension expert, and will leave your questions to others. I'm just the guy running the GB.

C

Haha, yeah, I rode with you and Lisa rode in Juns B14. I've been in plenty of NXs, but there was something extra silky about yours. I recently picked up some used Hyperco Gen 2s for $330 shipped , since I figured this wouldn't be happening again, ever. Makes sense they would feel so nice on 1f/2r. I am concerned that the Koni Yellows I am building for Shawn B and I are going to have so much rebound damping we will end up riding on the bumpstops

So that means if the B14 guys want some made for us does that mean we have to meet the min sets as well or can we join the B13 guys?

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I’d say at this point to just leave the current group buy, B13 specific. Let’s review the total B14 interest later next week.