Circuit Suspension set up

Road race, Auto X, or the Drag Strip

Postby eric thompson » Fri Feb 13, 2009 7:23 pm

http://gtfour.supras.org.nz/suspension.htm

here is a list of spring rates for the tte wrc celicas. notice how stiff the rear is on the st185 tarmac setup.
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Postby solarinsocal » Fri Feb 13, 2009 8:01 pm

Someone check my quick math. I'm getting approximately 12.5 front and 11.75 in the rear for tarmac, on a much lighter car. Wow. The ratio for front to rear is a lot closer than what we normally run. That may have a lot to do with the rear planting on our cars. Something to think about. I may change my spring rate choice based on this. Thanks Eric.
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Postby eric thompson » Fri Feb 13, 2009 8:06 pm

no problem! also... if your familiar with speed world challange, the realtime acuras run 1,000lb springs in the rear(or use to when they had integras) to aid rotating those front drives.
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NEED ONE MORE FOR STREET:)
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Postby eric thompson » Fri Feb 13, 2009 8:15 pm

1 kg = 2.2 lbs. or 1 lb = .45359 kgs

so the fronts were 320.2 kg and the rears were 300.2 kg
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ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
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Postby solarinsocal » Fri Feb 13, 2009 8:38 pm

Remember you have to do the math from inch to mm too. :wink:
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Postby eric thompson » Fri Feb 13, 2009 8:41 pm

OH YEAH! :twisted:
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Postby CMS-GT4 » Fri Feb 13, 2009 9:17 pm

Interesting how the tarmac settings are close. I am actually going to put softer 8kg fronts in. So I will have 8kg in the front and 7kg in the rear. This is an option that is also on some coilovers on evos and dsms.

Since this car gets driven mostly on the street, I have to reduce the front springs because it has put me in some dangerous situations. It also makes the car handle worse when the road condition is not as optimal.
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Postby lumbercis » Fri Feb 13, 2009 9:32 pm

eric thompson wrote:i was always opposed to using staggered tires on an awd car for driveline sake. unfortunately st165's have to run narrow tires by design unless you are willing to butcher the fenders and use coilovers. good luck and keep us posted!


Why would it make a difference if you run the same sidewall height? You don't even have to get staggered rims, just use a less wide tire in the rear.

If the handling characteristics of our cars are more like FWD, then it makes sense to use a setup similar to a FWD.
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Postby solarinsocal » Fri Feb 13, 2009 10:02 pm

Just as long as the rolling circumference is the same it wouldn't really matter. I haven't done it before but I am guessing that getting two different sized tires tthat have the same rolling circumference would be a pain in the butt to do. I don't know how sensitive our VC is to speed differences front to rear. Maybe it doesn't matter as much as I think it does.
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Postby smog7 » Sat Feb 14, 2009 11:31 pm

eric thompson wrote:http://gtfour.supras.org.nz/suspension.htm

here is a list of spring rates for the tte wrc celicas. notice how stiff the rear is on the st185 tarmac setup.


thank you for that link! i've been looking for that info for some time now..

lots of good info in this thread.

solarinsocal, does papa gushi ever visit the forum??
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Postby solarinsocal » Sun Feb 15, 2009 3:41 am

Hahaha, he wouldn't come on here. Why do you ask?
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Postby smog7 » Sun Feb 15, 2009 3:45 am

why wouldn't he??? just wondering...
solarinsocal wrote:Again I thought the same but the information is coming from Papa Gushi himself so I figured I'd give it a shot. He has a 165 himself and is running narrow tires as well.
Last edited by smog7 on Mon Feb 16, 2009 10:27 pm, edited 1 time in total.
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Postby eric thompson » Mon Feb 16, 2009 8:54 pm

solarinsocal wrote:Hahaha, he wouldn't come on here. Why do you ask?


that's curious..... are we too common? :shrug: if he had helpful info about gt4's, why not help?
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ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
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Postby solarinsocal » Tue Feb 17, 2009 5:59 pm

It's a little hard to explain. If you know the Japanese culture it might help a little bit. He wouldn't go out of his way to come onto a forum somewhere to offer assistance. Not that he's not willing to help but he is very busy with his business and racing both his own and his son's. He is definately a nice guy and will go out of his way for the people he knows. He built my motor for me as a favor but he won't do that type of thing for just anyone. It's hard to explain. Sorry. He's the strong, silent type. Hahaha. :) Hope this explains a little bit. If there are specific questions you had in mind, I will go pick his brain sometime.
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Postby solarinsocal » Mon Mar 02, 2009 10:38 pm

Update on the alignment. I finally got around to doing the alignment last night after finally replacing the bad wheel bearing. This is what I ended up with.

Front
-2.4 Camber
0.02 Toe

Rear
-1.3 Camber
0.00 Toe

I haven't had it out on the track yet but ran a throuh a canyon and it felt okay. A lot more neutral but I haven't really pushed too hard. I'll have to wait for the track for that. :D
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