I have a 93 Integra racecar for road racing (track only). The car feels very loose at the limit, and it has bad understeer mid corner. I am on 225-50-14 Hoosiers that are over 3 years old. I think this may be part of the problem. I do not have a front spliter yet and the rear wing is stock. I want some opinons on what is a good alignment to start off with. Caster, Camber, Toe, Front, Rear??
I just mesured my toe today with my homemade toe plates.

FRONT: 3/16 TOE OUT
REAR: 1/16 TOE OUT

Front: Tokico illuminas, GC, Eibach 600lbs, ST sway bar.
Rear: Advance Design, GC, Eibach 1300lbs, ST sway bar.

I bought the car with this setup. I will probably put a stock front sway bar up front when I find one cheep(free).
Not sure what camber or caster is set at. Dont have anything to mesure it with yet. Thanks in advance...





Modified by Tarmac Junkie at 12:19 AM 7/30/2008

 

I would suggest slightly less front toe out (1/8") and get rid of that toe out in the rear. I would try 0" or 1/16" toe IN at the rear.

Oh, and your rear seems WAY to stiff compared to the front...or the front is not stiff enough for the rear.

All IMO.

 

I think the biggest problem is your old tires. In my experience with hoosiers they would be really hard after that amount of time.

I run considerable toe out front and rear. If I toe in or at zero, it induces push .

what camber are you running? Also be sure your suspension bushings/bearings are in good shae

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JuanTushag &raquo;</TD></TR><TR><TD CLASS="quote">I think the biggest problem is your old tires. In my experience with hoosiers they would be really hard after that amount of time.</TD></TR></TABLE>

Maybe, but why would that cause understeer? Wouldn't the grip be reduced by the same amount, front and rear?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JuanTushag &raquo;</TD></TR><TR><TD CLASS="quote"> Also be sure your suspension bushings/bearings are in good shae</TD></TR></TABLE>

The sway bars have poly bushings, but the rest of the car has stock rubber bushings in good shape.
Do you think 1300 rear is too much in the rear for so-cal tracks? When I go through turn 8 at willow springs it feels like the car is bouncing off the ground. Or could this be fixed by messing aroung with the rear shock settings?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">

Maybe, but why would that cause understeer? Wouldn't the grip be reduced by the same amount, front and rear?
</TD></TR></TABLE>

I would think so. but its my experience when i have run old/hard tires the car goes to push. I dont know the dynamics of why. but it seemed the same with 3 very different vehicles i have driven. Front and rear wheel drive. I never really understood why

 

regarding the rear spring rates this is what I have found. I am running a 95eg. I believe it is a very similar platform to your car. ( the bottom of it anyway ! ) I believe most of the suspension is similar if not the same.

I run 900 front and 1200 rear. yes it is stiff and I do a little dancing through 8 at willow also. The car is quite fast however. It will run low 1:32.s

I never wanted to use that heavy of spring , but the car was "leaning" over way too much with 700 front and 1050 rear.

I think my car would be faster with softer springs, IF i could get it to not lean over so much . Your car may not have that problem being a different body shape with a lower center of gravity .

So I believe you may be able to go faster with softer springs, but before you change anything significant, test on fresh tires . That way you have eliminated one huge variable. The balance will be different and you may get the car to "plant" itself even with the heavy springs.

My only experience with Hoosiers was running a Viper for a couple of seasons, but the old tires definately fell off ( and pushed ) compaired to new ones

JT

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JuanTushag &raquo;</TD></TR><TR><TD CLASS="quote">regarding the rear spring rates this is what I have found. I am running a 95eg. I believe it is a very similar platform to your car. ( the bottom of it anyway ! ) I believe most of the suspension is similar if not the same.

I run 900 front and 1200 rear. yes it is stiff and I do a little dancing through 8 at willow also. The car is quite fast however. It will run low 1:32.s

I never wanted to use that heavy of spring , but the car was "leaning" over way too much with 700 front and 1050 rear.

I think my car would be faster with softer springs, IF i could get it to not lean over so much . Your car may not have that problem being a different body shape with a lower center of gravity .

So I believe you may be able to go faster with softer springs, but before you change anything significant, test on fresh tires . That way you have eliminated one huge variable. The balance will be different and you may get the car to "plant" itself even with the heavy springs.

My only experience with Hoosiers was running a Viper for a couple of seasons, but the old tires definately fell off ( and pushed ) compaired to new ones

JT</TD></TR></TABLE>

Thanks Renan. Ill definitly put on some new rubber.

 

I run 700F and 1000R with stock swaybar up front and 32mm ASR 120 wall rear.
2mm toe out front 2mm toe out back. The car feels very fast.


Edo

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EdoMoto &raquo;</TD></TR><TR><TD CLASS="quote">The car feels very fast.


Edo</TD></TR></TABLE>

Your car is very fast, but does it feel very loose at the limit (loose and fast)? Or does it feel planted? My car feels very loose and unstable at high speeds, but my lap times are on average 6sec. slower than yours. Mabee if your not too busy you can drive it at buttonwillow in a few months...

 

+1 for the tires being at least partly responsible. The old Hoosiers I drove on felt very unpredictable and crappy, similar in behavior to what you're describing. "Oh crap, push-wait, now oversteer, CRAP!" However, your suspension also seems very unbalanced. Crappy shocks and soft springs in the front with nicer shocks and really stiff springs out back doesn't make for anything good.