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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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08-30-2011, 11:43 AM | #3091 | ||
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When doing anything serious in motorsports, 3* is a minimum for our front suspensions, especially if there isn't much RC correction. Quote:
Also, I don't think lifting the front of the car really helps rear traction, but I need to do a little more studying as to the dynamic weight transfer. I know when static corner balancing a car, the more you raise one point on the car, the more weight is on THAT corner.
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08-30-2011, 02:03 PM | #3092 | ||||
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you would not want a boot made for cars, you need one for off road trucks, they come in black blue and red and are super cheap so there is not much reason for us to produce them... the black one matches everything. Quote:
we like to run less caster then stock, it requires a bit more direction from the driver instead of letting the car drift itself which is way more fun and controllable. you never want to run too much caster, it exaggerates over centering at a low steering angle. Quote:
since the caster just multiplies the camber like crazy at double OEM steering angle
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08-30-2011, 09:57 PM | #3093 | |
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Would you mind posting a couple links for the kind of boots to purchase? Are these them? http://www.energysuspensionparts.com...sp?prod=9.8130 Last edited by Matej; 08-31-2011 at 02:10 PM.. |
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08-31-2011, 12:34 AM | #3094 |
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Dan, it was absolutely awesome shooting the shit with you Saturday during the comp.
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08-31-2011, 05:14 AM | #3095 |
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Sorry for the dumb question but is it ever a good idea to try "correcting" a strut tower with camber/caster plates if it's only slightly out of spec?
Like say the passenger side front strut tower was pushed in towards the firewall .25"... is it okay to offset this with caster plates or is it worth it to get the strut tower pulled by a frame repair shop? |
08-31-2011, 05:50 AM | #3096 | |
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But it's fine to correct it with a caster plate in the short term.
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08-31-2011, 09:56 AM | #3097 | ||
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To apply this in drifting, I would assume the car is at a 45* yaw angle. The track length would be the length between the "instant grip point" of front to the "instant grip point" of the rear.
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09-01-2011, 10:50 AM | #3098 | |
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Care to explain why my first point is a myth? The running more camber will give you a flatter contact patch from the leading wheel? This is not a myth, it's simply truth, Take an S-chassis, with stock caster let's say(6.7-6.8). if you run 2.5* of negative camber, you are going to see a lot of positive camber at full lock from the leading wheel(This is where the diagonal wheel shit I was talking about comes into play). If you run 6.5* negative camber up front, you have a flatter contact patch and are using more of the tire, because at full lock your leading wheel will have hardly any positive camber. |
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09-01-2011, 12:56 PM | #3099 |
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^^^ The leading wheel has the least load out of all of them - you can literally remove it from the car mid-turn. The trailing front wheel has almost all of the load, and needs the contact patch that will promote the most traction (usually, because of tire loading, that's cambered in a bit).
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09-01-2011, 02:23 PM | #3101 |
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I just did a practice even two weeks ago, I added some caster by turning my camber plates sideways - and since I needed a little more clearance on the rear of my wheel well I also shortened my tension rods just a little.
I didn't get a chance to get a real alignment after I did this, so I eyeballed it, I believe it was toed in just a little from how it was handling. I toed it out some at the track and it felt better but I was having an issue with transitioning between turns. The first turn would feel awesome like I had a lot of grip, then it would basically tank slap and become uncontrollable when I'd transition. The very most I could manage was linking three turns before I'd spin out, and that involved a shit tone of input on my part. I am attributing most of that to my lack of having a real alignment (I checked my rear arms when I changed tires and my freaking traction arms were loose, I guess the alignment guys - or me - forgot to tighten them down all the way, so who knows how my rear alignment was). Any suggestions on correcting my instability issues? Obviously I need a real alignment, that will probably reveal a lot. Here's a picture, you can see the front wheels really well in it...
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09-01-2011, 04:02 PM | #3102 | |
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Point is, you'd be foolish to make concessions for the inside wheel's contact patch.
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09-01-2011, 04:15 PM | #3103 | ||
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Let's all get this straight. The leading wheel is the wheel with the most angle, the furthest forward wheel while drifting (unless you're going backwards), and the one on the "outside". This is the loaded wheel in drift. Sheesh, we need some standardized terms.
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It looks like you don't have much caster in that pic. That would explain why you had to make so much input to get the car to go where you wanted. I would recommend shortening your tension rods more, and if you want more negative camber then your strut tops are giving you, lengthen your LCA.
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09-01-2011, 06:44 PM | #3105 |
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My wheel was so far forward I ripped my bumper off on an initial test drive around my neighborhood. If I shorten them more then where they are now my tires will hit the front part of my fender where the bumper is attached.
Should I flip the camber plates the other way and shove the top of the shock toward the firewall? I was rubbing bad on the firewall side of my fender wells before, and I know I only had like 6* of caster before. Would caster really make the car feel THAT unstable. It was like tank slap city.
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09-01-2011, 07:36 PM | #3106 | |
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09-01-2011, 07:45 PM | #3107 | |
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I would put the camber plate back sideways, or just mess with it when you get an alignment so you can compromise between getting the wheel centered in the well and having enough/not too much caster. That being said, too much toe in or out will hurt grip by heating the front tires too much (scrubbing), and can make the rear feel unstable depending on the thrust angle.
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09-01-2011, 09:49 PM | #3108 |
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If you didn't have a known and symmetrical alignment than you really can't make any educated decisions about where to go next! On some cars, just a hair of toe out on either end makes the car almost undrivable. I agree w/ Poorman, go to a convensional set up with a good alignment (infront: 7 caster, 2.9-3.5 camber, 0 toe), take notes and go from there.
Re the 86 steering rack, I believe that all of that work was just to make room for the rotary. 13b has no conventional sump to create clearance for a rack, so it has to be infront of the engine. You can swap the stock spindles sides so that the steering arms are in front, then mount the steering rack infront of the engine. I considered doing a similar set up once I got the drysump for my build, but I realized that the bellhousing/flywheel and trans sit so low that there's no point. Even if the rack wasn't below my engine, I couldn't lower my engine anymore because the trans would drag on the ground while maintaining proper pinion angle to the diff.
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09-03-2011, 11:58 PM | #3109 | ||
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09-04-2011, 07:51 AM | #3110 |
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Hi people,
I'm busy getting my s13 to handle well (as in no tramlining) and got myself anti-bumpsteer tie-rods installed on my lowered car (2 fingers gap). Now i read you have to adjust the tierods parallel to the LCA. Now I was thinking is this parallel to the joints (red line) or the arm itself (blue line)? Sorry for the hijacking but I cant find the answer. Thanx for the help! Daniel
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09-04-2011, 09:35 AM | #3111 |
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Yeah, how much the links are curved doesn't matter, the red line is what the tie rod has to be parallel to.
Both the pivot points on the tie rod lie along it's axis, so you don't have to worry about anything like that with it. |
09-04-2011, 10:42 AM | #3112 |
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The blue line could be in an S shaped - doesn't matter. You just want the pivots to be parallel so the arms don't sweep in different arcs.
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09-04-2011, 12:25 PM | #3113 |
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Ok thanx guys. Going out to re-do the tierods to redline shape and play around with toe in/out haha.
Just noticed the lca's on my car are almost horizontal. Better to lift it up a bit I guess.
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09-04-2011, 08:43 PM | #3114 |
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These are some local guys that make some super cool stuff.
Cor Integration | Facebook Some very cool massive angle parts. |
09-05-2011, 10:39 AM | #3116 |
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going to be getting a front subframe mod from DANGDRIFTERS. Then throw some MA Motorsports awsomeotron 3000 knucks that my buddy has laying around for crazy steering angle next year.
in a few years I hope to be able to afford some driftworks front and rear knucks or D-UP garage might have theirs out by then and that would be sickkkkk! this is how much angle I had for this year with SPL outters and Z33 inners w/ spl spacers deff could have used some more angle to scrub speed |
09-06-2011, 02:24 PM | #3117 | |||||
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Dont toe out, and do a real alignment...that will help the stability agreed Quote:
yup you got to get it dialed, there is a middle ground to be found here.
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09-08-2011, 06:36 AM | #3118 |
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I apologize if this has been brought up before, but does anyone know anything about this: JUN Auto Drag Rear Member
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09-08-2011, 07:26 AM | #3120 |
Nissanaholic!
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Hmm, I wasn't able to find any posts in this thread about it. I'm just curious to what it actually is/how it works/what makes it worth $3k.
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anti-squat, best thread ever, kpi, roll center, steering angle, suspension |
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