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Sean
10-19-2005, 03:39 AM
Celica GTS, GT, underbody pics of the suspension setups. I am currently working with Full Race (top notch company!) to see if they can design some sort of traction aid for the front tires.

ANyone have any underbody pictures?

cosmic_sombrero
10-19-2005, 03:51 AM
I've not got any pics, but maybe you can give them Adrian's info:

Front:

(measured at ride height)

A-arm length 13.50”
A-arm to chassis center 13.50”
Ride Height measured to A-arm hinge bolt 6.5”
A-arm angle 2.12 degrees below horizontal
Distance of strut top to center of car 21.25”
Distance of strut top to A-arm hinge bolt 24.50”
Stock Kingpin Inclination (KPI) Angle 12.93 degrees
Stock strut inclination angle 5.60”
Instant Center (IC) located at 162.18” laterally from center and 13.011” from the ground.
Roll Center (RC) Height 1.945”
Front View Swing Arm (FVSA) Length 189.17

I’m already seeing some serious problems with lowering the car too much. It seems anything lower than 1” will put the roll center below ground and increases the roll couple by a substantial amount. In addition, increased axle wear may result. To lower more than this, there may need to be some modifications done to the suspension to fix the geometry. At stock ride height though, my oil pan only sits 4.5” off the ground so I don’t think I’ll be lowering the car much anyway.

I’m almost done calculating motion ratios so that I’ll be able to directly compare wheel rates to spring rates. At this point it’s looking to be in the 0.95 range.

For a glossary of suspension geometry terms see here:
http://rodandcustommagazine.com/techarticles/135_0401_ifs/
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Edit:
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After making measurements, I made a sketch in Solidworks to visualize the suspension movement:

http://img.photobucket.com/albums/v232/sbcelicagt/Celica%20V6/front_sus_stock.jpg


Rear:

(measured at ride height)

A-arm length 19.50”
A-arm to chassis center 4.00”
Ride Height measured to A-arm hinge bolt 9.00”
A-arm angle 4.41 degrees below horizontal
Distance of strut top to center of car 21.75”
Distance of strut top to A-arm hinge bolt 24.50”
Stock Kingpin Inclination (KPI) Angle 3.87 degrees
Stock strut inclination angle 2.97 degrees
Instant Center (IC) located at 171.055” laterally from center and 22.506” from the ground.
Roll Center (RC) Height 3.149”
Front View Swing Arm (FVSA) Length 194.497
http://img.photobucket.com/albums/v232/sbcelicagt/Celica%20V6/rear_sus_stock.jpg

Sean
10-20-2005, 02:11 AM
I hope you dont mind Adrian, I gave credit where it was due, and pointed Full Race to this thread.

"the link you gave me is a very intereting one and it seems you have a valuable suspension guru amngst yourselves! pretty neat. One thing i would like to see is an under-car view of the suspension arms and the front of the car, a picture of the OEM tow hooks, and a picture of how the front and rear LCAs attach to the spindle. (what the balljoint looks like) thanks!"

Those are his exact words. So, im going home this weekend to take pics for him :)

Ricksta
10-20-2005, 11:04 PM
so the lowest u can lower the celica is one inch?

cosmic_sombrero
10-20-2005, 11:46 PM
you CAN lower it more. It just puts the suspension in a non-optimal position, and therefor doesn't serve any purpose other than esthetics.

Adrian Avgerinos
10-24-2005, 09:13 PM
so the lowest u can lower the celica is one inch?

Check out the whole thread for details:

http://www.celicatech.net/forums/showthread.php?t=7528

I came to the conclusion it's not as bad as I originally thought. At the same time, it's not that great either. It looks like the biggest concern for most will be accelerated cv joint wear.

Sean-

No problem. I'm flattered he thought of me as a "guru" of sorts. However, I think I'd rather be known as an enthusiast with a degree. Less responsibility when I'm wrong. ;)

You can pass along these images of the spindles of you like:
http://img.photobucket.com/albums/v232/sbcelicagt/Celica%20V6/rear_sus_upgraded.jpg
http://img.photobucket.com/albums/v232/sbcelicagt/Celica%20V6/front_sus_upgraded.jpg

Sean
10-24-2005, 11:03 PM
Adrian your the man, thank you!