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Thread: Wanting to improve suspension setup. Need advice

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Posts: 11-14 of 14
2008-12-10 06:47:18
#11
alright thanks for the input guys. I think I'll check on the alignment and play with the air pressures
2008-12-12 05:10:04
#12
Originally Posted by classicaddict
toe out up front would make it under steer more. think of this, you are in a hard right hand turn and all the weight is on the left side.

with toe in up front the front left tire (front tire with most grip) wants to pull a tad harder to the right than if it had 0 toe setting.

with toe out in the back the left rear tire (rear tire with most grip) wants to pull out to the left more so than if it were set to 0 toe.


do the math and this will cause the car to rotate better. however dont take this as 100% true as i am not a racer, this is just comeing from personal theory and they seem to work pretty well on GT4 lol.


It's the opposite. Toe out is preferred for better turn in! Really only on an autocross setup, road course and hot street car should run zero toe.
2008-12-12 05:13:16
#13
My advice.

Caster bushings
Alignment
-2 degrees camber up front. Camber does not kill your tires NEAR as fast as toe does.
zero toe all around
As much positive caster as you can get.

After that I would replace the AGX's with CSK's and GC's to be able to choose rates. Then I would add a bump steer kit.
2008-12-12 12:28:05
#14
Originally Posted by MR-4Door-SR20DE
I see you have the CUSCO FTSB. How well does the rear CUSCO bar do verse the active tuning? I believe I saw one on JUN's car. The brace looks pretty nice and I believe it mounted in a different sport than the active tuning.

I cannot imagine a two-point bar much stiffer or stouter-built than the Active Tuning RSTB.

However, Chuck at Bolt-In-Bars sells a three-point RSTB. Yeah, I am sorely tempted to buy one, and I own an AT unit.

Originally Posted by MR-4Door-SR20DE
Also, what about having that sheet metal welded behind the back seats to fill that hole leading to the trunk.

You are talking about an IKEA brace.

Originally Posted by Prodrifter
I think just some front camber will help because right now it looks like there's none at all. but I heard caster bushings help improve turn in response so I don't know.

There is a thread, started by Mike Kojima, that fully discusses the issue of caster bushings. It is conveniently located within this section of the Suspension Thread

http://www.sr20-forum.com/suspension/1801-b13-b14-b15-suspension-information.html#post24089

Here's a little taste of what Mike Kojima thinks of the caster bushings (Whiteline or Superpro).
Originally Posted by Mike
I have been helping Whiteline develop a product for our suspension that is affordable, easy to install and fixes some painful suspension issues. We have tweaked the durometer for a higher performance version of the part based on testing in SE-R Cup and Autocross.

This bushing is great, even though its just a bushing, it goes a long way to fix three of our cars geometric problems in the front. I have been testing these on the Dog Car, Annie Sam has been testing them and so has Naji Dahi.

The caster and anti dive really improve on center feel, turn in and rotation under braking. You can feel these right away. It also gets rid of some of the lowered car axle compression issues and your axles last longer. These are especialy great if you can't aford the GC plates to get more caster.

I think the straight line stabilty improvements from the caster and the anti hop from reducing anti dive and lift (which is one of the things that cause hop) with the harder bushing make these good for drag racing as well.

I would get the new issue black colored harder 90 durometer KCA303M. The NVH issues are hardly any greater. This is harder than the Energy bushing. Best of all, its easy to install. Its not on the web sight yet so you have to ask for it.

Seriously, I think every tuned SE-R Street or otherwise needs some of these.

Read the whole thread, really suspension savvy dudes discuss the durometers of the Whiteline and Superpro caster bushings, blah, blah, blah. IIRC, Superpro makes the bushings for Whiteline.

The Superpros were not that expensive, I bought them merely because of Mike K's statements. That was enough for me, it's inexpensive and Mike K highly recommends it? That was a no-brainer in my book.

Originally Posted by Benito
ps I've heard complaints about lazy turn in with hypercos from some people I respect a lot.

I've also heard someone that I respect alot say that the Hyperco/CSK set-up is the performance suspension that is closest to OEM in comfort. Giving up a bit of absolute precision, for what is still a high-performance yet comfortable set-up.

That someone sir, is you. Which is exactly why I am going to end up with Hyperco's and CSK's.

Originally Posted by wes
Caster bushings

As much positive caster as you can get.

Another vote, from yet another savvy dude, for caster bushings.

I know very little, I just know exactly what all the smart dudes say.
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