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Acceleration and front end twist

ArgentumS550

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I recently updated the suspension and tires (see sig) and when I accelerate hard now, the car lifts a bit on the driver's side. I'm wondering if this is normal with the better tires (Michelin MPSS vs Hankook Aventis V12) hooking up (I don't have experience with the MP4Ss) or the new suspension and the softer initial spring rate of the springs?

If this is something that should be corrected, stiffer sway bar or...?
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Jackson1320

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You have strut tower brace? Jacking rails? But yes the car is gonna lift on the driver side
 
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ArgentumS550

ArgentumS550

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You have strut tower brace? Jacking rails? But yes the car is gonna lift on the driver side
Yes to both brace and rails. I should have said its lifting more than before the install of parts. I guess, maybe, the MPSSs are hooking better than since I don't remember it happening like this when I got the car and the Hankooks still had good tread.
 

Norm Peterson

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Do this before simply throwing parts at it.

Get a 3/4 head-on video so you can tell how much of the nose rise you're seeing is even (side to side), how much is coming from the tail squatting, and if there's much of anything coming from overall chassis twist or how ever much body roll could be coming from differential and rear cradle bushing compliances.


Norm
 

Excelerater

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if you are lifting the drivers side tire you are dong something right .
Rear sway bar is what helps control that plus if you really wanna get
it PERFECT u scale the car ,roll cages also help keep a chassis stiff
 

Norm Peterson

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Rear sway bar is what helps control that
You can't get nearly as much help from a rear bar in an IRS car as you can in a solid-axle car.

Driveshaft torque doesn't plant the left rear in an IRS car because of the two universal joints on each half-shaft can't carry that kind of load (unless they're binding up really bad).

Engine torque reaction never gets outside the chassis because the diff is chassis-mounted as well. In this respect, an IRS car behaves more like a solid-axle car that has no rear suspension at all.


Norm
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