Originally Posted by Drifting rex
(Post 11391954)
Ok, so you want your roll center be as close as possible to your center of gravity to decrease the amount the body rolls/ suspension moves in a corner with out the use of stiffer springs/swaybars... Is this correct reasoning?
Also what do you mean by camber reconvery? camber recovery = the ability of the suspension to recover the camber lost when the body rolls. |
Ahhh ok because as the body rolls even if the suspension travel is completely camber neutral (made that up) it will becaome positive from the body roll?
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Originally Posted by Drifting rex
(Post 11392193)
Ahhh ok because as the body rolls even if the suspension travel is completely camber neutral (made that up) it will becaome positive from the body roll?
a "camber neutral" car (i've never heard the term either!) sounds like if you set the camber to zero when the car is at rest, and then rolled the car 3-4 degrees, it would still be at zero camber. i haven't tried that with the FC, but its close, what you actually want is 0 camber going down the road, and then the suspension to gain camber as you corner, so going straight its 0 and then in a turn its -3 or whatever. the tire will have maximum grip with some negative camber, how much camber depends on the tire. |
Originally Posted by Drifting rex
(Post 11391954)
Ok, so you want your roll center be as close as possible to your center of gravity to decrease the amount the body rolls/ suspension moves in a corner with out the use of stiffer springs/swaybars... Is this correct reasoning?
Also what do you mean by camber reconvery? 1-2" above ground in front is typical, a little more in rear. |
Originally Posted by eage8
(Post 11387351)
Of caster? pretty easily :p: stock is like 6* isnt' it?
Are you running the AWR caster/camber plates to get the 7 degrees? Did you have to slightly notch the back of the strut housing to pull it back enough to get that much caster? I'll have to also look into the RCA balljoint setup from AWR, unfortunately with this car you can't just simply redrill the control arm mounting points a bit higher because of the way the rear control arm mount is setup. |
Originally Posted by 88rx7racer
(Post 11430221)
eager8, I haven't actually checked the alignment settings on my car yet (newer to FC RX7s and I'm just now tthinking of suspension upgrades, not new to suspension geometry/racing) but the FSM for the S5 cars shows ~4.7 degrees caster. I would assume it would be the same for S4 cars as well.
Are you running the AWR caster/camber plates to get the 7 degrees? Did you have to slightly notch the back of the strut housing to pull it back enough to get that much caster? I'll have to also look into the RCA balljoint setup from AWR, unfortunately with this car you can't just simply redrill the control arm mounting points a bit higher because of the way the rear control arm mount is setup. Ground Control - Camber/Caster Plate - '86-'91 RX7 (Pair) I haven't touched my strut towers, this is with my older mazdaspeed plates, but their pretty much the same: https://lh4.googleusercontent.com/-U...2/IMAG0803.jpg lowering the car will also increase your caster. |
Thanks for the picture, its good to know that 7 degrees caster is somewhat easily attainable for a second gen RX7. For foxbody mustangs you need to move the wheels forward 1.5" plus max the plates to get that much, but then again the front end is very heavy and manual racks were available so it kind makes sense from a boring commuter car standpoint (lack of caster = low steering effort).
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Check out this new product in development. So far there is AWR's ball joint and now this as products we can buy.
Forums / |
This is my first time posting an image, hope it works.
Here is the roll center correcting knuckle, I'm estimating 400 dollars for a pair if its close in price to their 240 knuckle mod. http://www.gtfactory.jp/cms/e107_fil...9_dsc03907.jpg |
Originally Posted by nauri9
(Post 11431887)
This is my first time posting an image, hope it works.
Here is the roll center correcting knuckle, I'm estimating 400 dollars for a pair if its close in price to their 240 knuckle mod. http://www.gtfactory.jp/cms/e107_fil...9_dsc03907.jpg |
I've read somewhere that Ackerman mostly is useful at low slip angles and thus low speeds, so an autocross event where the tire slip angle is high Ackerman means less, that's why we run so much toe out.
I still think they are pretty cool, they appear to have around 1.5-2 inches of drop. If you go to their forum you can see all the products they are developing for the fc, they already have the rear camber links out. Check it out here. Forums / |
If you're doing it right, you design your ackermann angles around your expected slip angle.
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They really need to make a new knuckle instead of cutting and welding the original one. Perhaps that's something they are planning to do. I wouldn't run one with that much cutting and welding on my car. It is a cast part to start with!
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Originally Posted by abeomid
(Post 11433244)
They really need to make a new knuckle instead of cutting and welding the original one. Perhaps that's something they are planning to do. I wouldn't run one with that much cutting and welding on my car. It is a cast part to start with!
S Chassis billet aluminium knuckles |
bump
Originally Posted by Drifting rex
(Post 11391954)
Ok, so you want your roll center be as close as possible to your center of gravity to decrease the amount the body rolls/ suspension moves in a corner with out the use of stiffer springs/swaybars... Is this correct reasoning?
Also what do you mean by camber reconvery? Serious bump. I want more knowledge!! |
Originally Posted by Turtle13
(Post 11793018)
Serious bump. I want more knowledge!!
Also, check out my build thread, the last few pages have a lot of roll center talk in them: https://www.rx7club.com/build-thread...turbo-1031251/ Here is the most recent version of my balljoints that I made adjustable with a large 3/4" bolt after the AWR pin broke: https://lh6.googleusercontent.com/-z...728_212103.jpg |
2 Attachment(s)
Anyone know anything about these? Some Facebook guy which drifts an fc is trying to produce them.
Attachment 550755 Attachment 550754 |
Originally Posted by junito1
(Post 11854598)
Anyone know anything about these? Some Facebook guy which drifts an fc is trying to produce them.
Attachment 550755 Attachment 550754 https://www.rx7club.com/drifting-226...iment-1067736/ you can't use a rod end for a ball joint, it'll crack off right at the threads. |
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