CAMARO6 - View Single Post - Shimmy on hard accelleration & higher speeds

Shawnqa800720 · 10-02-2019, 04:36 PM

I have a mystery for the forum to solve. Under full throttle acceleration I am experiencing a strange shimmy /pulling feeling starting around 60MPH through at least 90MPH. It feels like an auto-steering / lane-change correction, but more significant than that. It is pretty dramatic and feels very unsafe. It should not be breaking loose at that speed and the TC lights do not come on to indicate that is what is happening (and it doesn't feel like that - it is more of a pulling than a sliding out).

Car set up is 1SS with the GM lowering and sway bar kit, BMR rear cradle lockout kit, and BMR front sway bar end links. The tires are Dunlop Race Maxx front (295/30R20) and Race Maxx 2 rear (305/30R20) (both Porsche spec for the GT3 RS).

The BMR kit was installed by a shop and the torque to yield bolts were replaced. Everything seems tight.

I have a few guesses, but I'm not going to color your thoughts yet. Who is our resident sleuth?

10-02-2019, 04:36 PM	#1
Shawnqa800720 Drives: 2018 1SS Join Date: Dec 2018 Location: MA Posts: 308	Shimmy on hard accelleration & higher speeds I have a mystery for the forum to solve. Under full throttle acceleration I am experiencing a strange shimmy /pulling feeling starting around 60MPH through at least 90MPH. It feels like an auto-steering / lane-change correction, but more significant than that. It is pretty dramatic and feels very unsafe. It should not be breaking loose at that speed and the TC lights do not come on to indicate that is what is happening (and it doesn't feel like that - it is more of a pulling than a sliding out). Car set up is 1SS with the GM lowering and sway bar kit, BMR rear cradle lockout kit, and BMR front sway bar end links. The tires are Dunlop Race Maxx front (295/30R20) and Race Maxx 2 rear (305/30R20) (both Porsche spec for the GT3 RS). The BMR kit was installed by a shop and the torque to yield bolts were replaced. Everything seems tight. I have a few guesses, but I'm not going to color your thoughts yet. Who is our resident sleuth? __________________ 2018 Red Hot 1SS, GM lowering kit & 1LE Sway bar kit, ZL1 1LE solid rear cradle bushings, BMR sway bar end links, GM CAI w/tune, Pray ported IM, Mamo ported TB, VS Forged VS07 rims 20x11 & 20x10 w/ Michelin PS4S