This is the roll center, suspension pickup, and steering angle modification thread. - Page 197 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

PoorMans180SX · 10-10-2013, 07:11 PM

Old vs. new.

Together:

[email protected] · 10-11-2013, 02:24 AM

Quote:

Originally Posted by PoorMans180SX

Old vs. new.

Together:

Put t on the car and then take the photos.. LOL

808drft · 10-11-2013, 01:33 PM

Quote:

Originally Posted by [email protected]

I have a vision here but I'm not sure if what I've thought up will work. Perhaps you guys can point me in the right direction.

I'm building a car with a tube frame front and I want to use S-chassis suspension because of the availability of parts. However,
I also really want a double wishbone set up in front, so here is what I've come up with:

I'll use an s-chassis subframe, rack, and LCAs, and then machine a metal puck which will be welded into a short cut off part of
the strut, holding a ball joint and attaching to the upper control arm which I'll fabricate. Sort of like the image below:

The mca s13 in Australia is using a double wishbone front suspension using 240sx knuckles
Nerd's Eye View: The MCA Suspensions "Hammerhead" Silvia S13

PoorMans180SX · 10-11-2013, 05:46 PM

Ride Height:

Control arm angle:

EDIT: Old setup when the car was higher and picture is slightly angled.

dudermagee · 10-11-2013, 07:02 PM

Quote:

Originally Posted by PoorMans180SX

Ride Height:

Control arm angle:

epic stuff right there
what about the rear?

PoorMans180SX · 10-11-2013, 10:16 PM

Quote:

Originally Posted by dudermagee

epic stuff right there
what about the rear?

Rear is basically stock with subframe risers unfortunately

. It'll be a while until I can afford either the Wisefab rear or the new TDP kit that's in development.

I should probably include this. Take in line with the strut tower, no cheater ahead of the car shots

. This is with the strut inside the PCD of the strut tower and around -4.7* of camber on each side.

Silvi · 10-13-2013, 11:16 AM

Are you guys using lock stops on extended LCAs and big angle knuckles?
how bad is not use them? im not sure if my tie rod is close enough to hit the LCA

mikerbike · 10-17-2013, 09:30 AM

Quote:

Originally Posted by PoorMans180SX

Remove the lock stop and notch the control arm. You'll need to move the inner tie rod forward too. Easiest way is to buy offset rack spacers. But the best way is to modify the subframe so the rack sits further forward.

Motary · 10-17-2013, 03:57 PM

lul ^ dat bumpsteer and strength

rbs14kouki · 10-17-2013, 04:56 PM

Zak Pole new r33 set-up

Silvi · 10-17-2013, 09:51 PM

Quote:

Originally Posted by mikerbike

Remove the lock stop and notch the control arm. You'll need to move the inner tie rod forward too. Easiest way is to buy offset rack spacers. But the best way is to modify the subframe so the rack sits further forward.

The steering rack is already forwarded by 25mm.
about notching the LCA, i'm afraid that the notched LCA wouldn't be strong enough

Black R · 10-19-2013, 06:55 AM

Quote:

Originally Posted by thefro526

Please excuse me if this has already been discussed, but anyone know anything about these:

Apparently, they're made by Manatee Racing, and don't seem to be all 'that' common. (although, there was a set for sale on YAJ recently)

The Front and Rear LCA's are somewhat standard and/or straight forward, but the Rear Upper Control arm (bottom right) seems to be really different. I've been trying to wrap my head around what exactly it is, or does, and the only explanation I can come up with is that it's a one piece version of our 'upper A-arm' - one piece being that it combines the Traction Rod and RUCA. (IIRC, Dentsport's S13 has a similar upper arm)

What's the benefit to this, if any?

I wonder what's the cost association?

Black R · 10-19-2013, 07:24 AM

Quote:

Originally Posted by GKTECH

time for some track testing. The current Australian dollar is good for you guys. The intro price is going to be $199 AUD including our sales tax which is $181AUD excluding our tax = $162USD + delivery.

40mm roll centre correction and a little over 60 degrees of bolt on steering lock.

I want to see a car with these!

Are they out yet?

killer240 · 10-20-2013, 03:05 AM

Quote:

Originally Posted by PoorMans180SX

do you have a picture of the clearance between the wheel/tire and frame at full lock?

PoorMans180SX · 10-20-2013, 11:43 AM

Quote:

Originally Posted by killer240

do you have a picture of the clearance between the wheel/tire and frame at full lock?

Here you are sir:

The inner rim is hitting the LCA in this pic, even though it doesn't look like it.

Also, here's a picture of my friend Kurtiss's car, he has the TDP kit with the struts relocated farther forward than mine. It pulls more angle this way.

killer240 · 10-22-2013, 02:49 AM

^^^^thank you

I'm debating wether to get this kit, the price is what's bothering me.

PoorMans180SX · 10-22-2013, 10:18 AM

Quote:

Originally Posted by killer240

^^^^thank you

I'm debating wether to get this kit, the price is what's bothering me.

Yeah, it is definitely expensive. I'll say again though, the adjust-ability is phenomenal. I can make this a wisefab low caster setup, and with a few minutes and an alignment turn it into a normal modified knuckle style setup. A few more minutes and it's set up with higher ackerman for a road course. The roll center correction also kills most everything else on the market.

Don't do it if you're like me and now struggling to get the car together because you bought an angle kit though, hah.

MiamiZ33 · 10-22-2013, 08:56 PM

PoorMans180sx, what did you do with the DW stuff?

If somebody has Geomasters laying around they'd lend me, I'd pay to borrow them. I want to CAD them up and make my own.

PoorMans180SX · 10-22-2013, 11:16 PM

Quote:

Originally Posted by MiamiZ33

PoorMans180sx, what did you do with the DW stuff?

If somebody has Geomasters laying around they'd lend me, I'd pay to borrow them. I want to CAD them up and make my own.

I never had any Driftworks stuff, I had always wanted to buy it when it was the only drop knuckle kit on the market, but I never got a chance.

Motary · 10-24-2013, 08:34 AM

That is quite a lot of clearence, are you using overdenders to cover the wheels? My arm is about 25mm longer than stock and I have poke

thefro526 · 10-24-2013, 09:03 AM

Quote:

Originally Posted by Motary

That is quite a lot of clearence, are you using overdenders to cover the wheels? My arm is about 25mm longer than stock and I have poke

Could be totally wrong here, but it looks like he's got 20/25mm Over fenders with a relatively narrow wheel, maybe an 17x8.75" (I think those wheels come in that size.)

PoorMans180SX · 10-24-2013, 10:29 AM

Quote:

Originally Posted by Motary

That is quite a lot of clearence, are you using overdenders to cover the wheels? My arm is about 25mm longer than stock and I have poke

These arms at their shortest are 35-40mm longer than an S13 arm.

Quote:

Originally Posted by thefro526

Could be totally wrong here, but it looks like he's got 20/25mm Over fenders with a relatively narrow wheel, maybe an 17x8.75" (I think those wheels come in that size.)

I'm using "40mm" wide fenders (I don't have stock ones so I can't compare), and an 18x8.75+20 wheel with a 215/35/18 tire. The fenders are currently riding on the tire, and I might just have to get flares or a smaller tire to make it functional.

I am pulling -5* of camber in the front with the knuckle adjusted to the maximum positive camber at this ride height. This is because I have the strut inside the PCD of the tower, and the knuckle hits the lower part of the coilover.

The tire also scrubs at the top of the wheel well at lock (trailing wheel), I'm not sure what combo of hammering, cutting, or raising the car will make this functional yet. If it comes down to raising it, I don't want to raise it much, as my whole point in buying this kit was to make a low car function as best it can.

I'd really like to get some 17x8.25's for the front with a 215/40/17.

Not sure when this is going to be on the road for some actual testing, hopefully before the close of the year.

Black R · 10-25-2013, 07:21 PM

Quote:

Originally Posted by PoorMans180SX

The inner rim is hitting the LCA in this pic, even though it doesn't look like it.

Wait, what?

So if you had lower offset wheels, it wouldn't hit the LCA?
And then you could dial in even more angle?

What clearancing have you done to the inside of the wheelwells?

Mini tubs?

Ground off and welded the seams?

Just straight cut shit out?

PoorMans180SX · 10-25-2013, 10:06 PM

Quote:

Originally Posted by Black R

Wait, what?

So if you had lower offset wheels, it wouldn't hit the LCA?
And then you could dial in even more angle?

What clearancing have you done to the inside of the wheelwells?

Mini tubs?

Ground off and welded the seams?

Just straight cut shit out?

The trailing wheel hits the top of the wheel well at full lock. This is the only clearance issue I have at this point. I may just cut the wheel wells out for clearance. The only clearance work I have done is hammer the seems in the well as you can see above, as well as the classic on top of the well.

I could dial in more angle two ways, reduce the caster, or get thinner wheels. Lower offset won't really work unless I get fender flares, the wheels are already touching the fenders. I want to get some 17x8.25 of these same wheels for the front, but they don't really make a shorter tire than the one I have on it, so I'll have to either raise it or cut the wells out/tub it.

OgSilviaSkywalker · 10-26-2013, 02:43 AM

i need those gktech knuckle attachments so bad!!!!!

*DJPimpFlex* · 10-26-2013, 02:44 AM

Anyone else read about the gktech knuckles breaking from overcentering?

Sent from my SAMSUNG-SGH-I527 using Tapatalk

Motary · 10-26-2013, 03:44 AM

Poorman, how is the clearence from brake line bracket at the chassis side? I had to move mine via one bolt hole

PoorMans180SX · 10-26-2013, 08:54 AM

Quote:

Originally Posted by DJPimpFlex

Anyone else read about the gktech knuckles breaking from overcentering?

Sent from my SAMSUNG-SGH-I527 using Tapatalk

The thing I read the guy had moved the steering arm up and out of the slot it goes in. I'm not sure why you would do that...
And I guess they are discontinuing the "Extreme" steering arms, apparently a lot of people are having binding issues (aka set up the car wrong), and I'm sure GKtech wants to cover it's back.
GKtech put a press release on their facebook:

https://www.facebook.com/photo.php?f...type=1&theater

Quote:

Originally Posted by Motary

Poorman, how is the clearence from brake line bracket at the chassis side? I had to move mine via one bolt hole

Oh yeah. It rubbed the bracket pretty bad. I have stainless lines from the master to the caliper to install, I'm not sure how that'll turn out.

OgSilviaSkywalker · 10-28-2013, 11:35 PM

I need extended ball joints for my flcas anyone know where to get some with about an inch if not more of roll center corroection

PoorMans180SX · 10-28-2013, 11:54 PM

Quote:

Originally Posted by OgSilviaSkywalker

I need extended ball joints for my flcas anyone know where to get some with about an inch if not more of roll center corroection

Moonface makes ones with up to 15mm of correction I believe, you really can't go much past 20mm or it starts hitting your rotor. It also increases ackerman substantially.

Why do you need extended ball joints specifically? A much better solution is PSM's forged knuckle, or their Pro-grip knuckle if you're not into faster steering and low ackerman.

10-10-2013, 07:11 PM	#5881
PoorMans180SX Zilvia.net Advertiser Join Date: Nov 2005 Location: Michigan Age: 33 Posts: 5,431 Trader Rating: (16) Rides Gallery: PoorMans180SX Feedback Score: 16 reviews	Old vs. new. Together: __________________ Build: http://zilvia.net/f/showthread.php?t=643065 Friends don't let friends buy knock-offs.

10-11-2013, 05:46 PM	#5884
PoorMans180SX Zilvia.net Advertiser Join Date: Nov 2005 Location: Michigan Age: 33 Posts: 5,431 Trader Rating: (16) Rides Gallery: PoorMans180SX Feedback Score: 16 reviews	Ride Height: Control arm angle: EDIT: Old setup when the car was higher and picture is slightly angled. __________________ Build: http://zilvia.net/f/showthread.php?t=643065 Friends don't let friends buy knock-offs. Last edited by PoorMans180SX; 10-11-2013 at 10:14 PM..

10-17-2013, 04:56 PM	#5890
rbs14kouki Zilvia Addict Join Date: Oct 2007 Location: Montreal , Canada Age: 35 Posts: 817 Trader Rating: (1) Feedback Score: 1 reviews	Zak Pole new r33 set-up __________________ AV FABRICATION Built thread sr20vet s14 http://zilvia.net/f/showthread.php?t=535574

10-22-2013, 02:49 AM	#5896
killer240 Post Whore! Join Date: Jun 2009 Location: Pair of dice, Norcal Age: 31 Posts: 2,619 Trader Rating: (24) Feedback Score: 24 reviews	^^^^thank you I'm debating wether to get this kit, the price is what's bothering me. __________________ REVIEW

10-26-2013, 02:44 AM	#5906
DJPimpFlex Premium Member Join Date: Jan 2004 Location: Rohnert Park, CA Age: 35 Posts: 6,151 Trader Rating: (115) Rides Gallery: DJPimpFlex Feedback Score: 115 reviews	Anyone else read about the gktech knuckles breaking from overcentering? Sent from my SAMSUNG-SGH-I527 using Tapatalk __________________

10-13-2013, 11:16 AM	#5887
Silvi Leaky Injector Join Date: Nov 2011 Location: IL Posts: 131 Trader Rating: (0) Feedback Score: 0 reviews	Are you guys using lock stops on extended LCAs and big angle knuckles? how bad is not use them? im not sure if my tie rod is close enough to hit the LCA

10-17-2013, 03:57 PM	#5889
Motary Zilvia Junkie Join Date: Nov 2007 Location: Estonia Age: 32 Posts: 450 Trader Rating: (2) Feedback Score: 2 reviews	lul ^ dat bumpsteer and strength

10-22-2013, 08:56 PM	#5898
MiamiZ33 Zilvia Member Join Date: Sep 2011 Location: Miami, FL Age: 37 Posts: 258 Trader Rating: (1) Feedback Score: 1 reviews	PoorMans180sx, what did you do with the DW stuff? If somebody has Geomasters laying around they'd lend me, I'd pay to borrow them. I want to CAD them up and make my own.

10-24-2013, 08:34 AM	#5900
Motary Zilvia Junkie Join Date: Nov 2007 Location: Estonia Age: 32 Posts: 450 Trader Rating: (2) Feedback Score: 2 reviews	That is quite a lot of clearence, are you using overdenders to cover the wheels? My arm is about 25mm longer than stock and I have poke

10-26-2013, 02:43 AM	#5905
OgSilviaSkywalker Zilvia Junkie Join Date: Oct 2011 Location: whittier ca Posts: 347 Trader Rating: (5) Feedback Score: 5 reviews	i need those gktech knuckle attachments so bad!!!!!

10-26-2013, 03:44 AM	#5907
Motary Zilvia Junkie Join Date: Nov 2007 Location: Estonia Age: 32 Posts: 450 Trader Rating: (2) Feedback Score: 2 reviews	Poorman, how is the clearence from brake line bracket at the chassis side? I had to move mine via one bolt hole

10-28-2013, 11:35 PM	#5909
OgSilviaSkywalker Zilvia Junkie Join Date: Oct 2011 Location: whittier ca Posts: 347 Trader Rating: (5) Feedback Score: 5 reviews	I need extended ball joints for my flcas anyone know where to get some with about an inch if not more of roll center corroection

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