Having understeering problems in 07 STI

  • Thread starter Thread starter ericeng91
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ericeng91

ericeng91

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Hey guys. I've been trying to tune my 07 STI (hatch) and have been getting some understeer. I've decreased it a ton already from my beginnings by playing with the LSD settings and ride height, but now I am pretty stuck on what to improve or where to go from here, so I'm asking the help of you guys!

Here's my tune right now. I would like to think it is pretty decent, so if you want to take it, go right ahead.

Subaru Impreza WRX STI '07
all engine and weight upgrades - Max Power 532hp, Weight 1219kg 566 PP

Trans
1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 1.077
6th - 3.786
Final - 3.786
Top Speed 211

*This trans setting was taken from another tune posted up here. I can't remember who's it was, so I apologize for not being able to give due credit

LSD
Front Rear
IT 5 25
AS 15 50
BS 8 20

Diff
front 30, rear 70

Suspension

Ride Height 0 -3
Spring Rate 4.8 6.5
Damper (E) 4 6
Damper (C) 5 7
ARB 4 6
Camber 1.7 1.5
Toe -0.04 0.07

Brake Balance
5, 5

No ballast or any other things done to the car, my testing was done on soft racing tires on the Nurburgring Nordschleife.


A little more on the understeer, it seems to be when not on the gas, first entering my turn. When getting back on power, it seems pretty good and tracks pretty well. Right now, I would say the car is setup neutral, with a hint of understeer entering the turn, and a hint of the rear stepping out during braking into a turn. Aside from that, my only concern with the car is instability while braking, but that's what I'm giving up to have minimal understeer entering the turn.
 
ericeng91
LSD
Front Rear
IT 5 25
AS 15 50
BS 8 20

Diff
front 30, rear 70

Suspension

Ride Height 0 0
Spring Rate 12.5 11.0
Damper (E) 7 7
Damper (C) 9 8
ARB 5 6
Camber 1.8 0.9
Toe -0.15 0.0

Brake Balance
4,6
.
Click to expand...

Those would be what I would change. If your on NuR or De La Sarthe I would go a little softer on the springs (like -2 on both)

That's just off the top off my head, I know I have an evo that has a real nice setup, I'll get the exact numbers later

Oh and add aerodynamics if its premium
 
increase rear spring rate, increase rear bound, increase rear anti roll. If your car is too oversteering, see if you can gain rear grip by adding rear camber, then you have a more neutral car and higher cornering speeds.
 

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