too much understeer now!

vortrex · 11-24-2010, 01:13 PM

changed my tire pressures to 36F and 32R, what a big difference! no more bobbing in the corners. feels like it did when stock now.

travisjb · 11-24-2010, 01:28 PM

ahhhh... I think what you were describing then was turn in not understeer... higher front tire pressure is going to feel more "crisp" when you turn in, but not necessarily give you a greater lateral G before break-away nor tighten up slip angle

glad it's working out

Jessobear · 11-27-2010, 08:35 AM

I looked around and was never able to find the factory toe specs. What I was going to suggest is having the car aligned so that the front toe is towards the maximum end of the spec and the rear toe is towards the minimum end of the spec.

By the way, the factory tire inflation spec is 35 psi front and rear. Glad to hear the tire pressure changes helped.

Jessobear · 12-07-2010, 07:15 AM

Just in case you're still looking at this, I finally found the factory alignment specs.

Front:

Camber - -1.41 to 0.08 degrees (-0.67 nominal)
Caster - 4.42 to 5.91 degrees (5.17 nominal)
Total Toe - 0.04 to 0.11 inches (0.08 nominal)

Rear:

Camber - -2.16 to -1.17 degrees (-1.67 nominal)
Total Toe - 0.08 to 0.21 inches (0.15 nominal)

They list this spec as total toe in, but above on the rear you list split measurements for toe. So my interpretation is that you have 0.08 inches total toe in the front and 0.18 inches in the rear? If that's correct, since you have the minimum camber spec in the front and close to the nominal spec in the rear, I'd try decreasing rear toe to the nominal spec or slightly lower and see how things are.

djpathfinder · 12-07-2010, 09:20 AM

That's in degrees, not inches.

Jessobear · 12-08-2010, 02:05 AM

Quote:

Originally Posted by djpathfinder

That's in degrees, not inches.

No, that's inches (if you're talking about toe). They did also list the spec in degrees and millimeters..

11-24-2010, 01:28 PM	#47 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 188	ahhhh... I think what you were describing then was turn in not understeer... higher front tire pressure is going to feel more "crisp" when you turn in, but not necessarily give you a greater lateral G before break-away nor tighten up slip angle glad it's working out __________________ 2009 370Z #104 For Sale

12-07-2010, 09:20 AM	#50 (permalink)
djpathfinder A True Z Fanatic Join Date: Mar 2010 Location: Edmonton, Canada Posts: 12,910 Drives: 2012 GT-R BE Rep Power: 733	That's in degrees, not inches. __________________ 2012 GT-R Black Edition Jet Black 2010 370Z 40th Anniversary // SOLD

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11-24-2010, 01:13 PM	#46 (permalink)
vortrex Base Member Join Date: Nov 2009 Location: SF, CA Posts: 199 Drives: '09 370z 6spd Rep Power: 16	changed my tire pressures to 36F and 32R, what a big difference! no more bobbing in the corners. feels like it did when stock now.

11-27-2010, 08:35 AM	#48 (permalink)
Jessobear Base Member Join Date: Oct 2010 Location: Washington, DC Posts: 201 Drives: '10 370Z Tour/Sp M6 Rep Power: 15	I looked around and was never able to find the factory toe specs. What I was going to suggest is having the car aligned so that the front toe is towards the maximum end of the spec and the rear toe is towards the minimum end of the spec. By the way, the factory tire inflation spec is 35 psi front and rear. Glad to hear the tire pressure changes helped.

12-07-2010, 07:15 AM	#49 (permalink)
Jessobear Base Member Join Date: Oct 2010 Location: Washington, DC Posts: 201 Drives: '10 370Z Tour/Sp M6 Rep Power: 15	Just in case you're still looking at this, I finally found the factory alignment specs. Front: Camber - -1.41 to 0.08 degrees (-0.67 nominal) Caster - 4.42 to 5.91 degrees (5.17 nominal) Total Toe - 0.04 to 0.11 inches (0.08 nominal) Rear: Camber - -2.16 to -1.17 degrees (-1.67 nominal) Total Toe - 0.08 to 0.21 inches (0.15 nominal) They list this spec as total toe in, but above on the rear you list split measurements for toe. So my interpretation is that you have 0.08 inches total toe in the front and 0.18 inches in the rear? If that's correct, since you have the minimum camber spec in the front and close to the nominal spec in the rear, I'd try decreasing rear toe to the nominal spec or slightly lower and see how things are.