by "oneavejoe" (oneavgjoe)
Published 02/23/2017 at 13:39
by "oneavejoe" (oneavgjoe)
Published 02/23/2017 at 13:39
No Tags
STARS: 0
I had a co-worker ask me a question: He was driving his C6 Grand Sport (new to him, bought it a couple weeks ago) and when turning aggressively he experienced more turn in than he anticipated. He is an experienced driver of muscle cars and understands oversteer/understeer well. He said he felt like the car was pulling into the curve. He had to steer slightly out of the turn to compensate. Is this a common driving effect I have just never felt or is this something else?
Data: Michelin Pilot SS, temp 60°F, 60 mph on 40 mph roads.
"V12 Jake- Hittin' Switches" (jbv12)
02/23/2017 at 13:43, STARS: 2
My only guess would be that he’s maybe not used to the more aggressive steering on the Vette. I’ve got a good amount of experience in a C6, and i remember them having quite a bit of lateral grip.
"RamblinRover Luxury-Yacht" (ramblininexile)
02/23/2017 at 13:48, STARS: 1
PSS on a C6? Seems like having grip for DAYS could have an effect on steering, like the power steering assist being designed for more understeer, and maybe he needs to up the caster.
"Die-Trying" (die-trying)
02/23/2017 at 13:50, STARS: 1
could just be how the “Ackerman” is set up, along with some actual grip compared to what he is used to.......
"SidewaysOnDirt still misses Bowie" (sidewaysondirt)
02/23/2017 at 13:51, STARS: 0
Is it stock? My first thoughts would be rear toe or possibly front caster, though if combined with dampers that are too stiff it can cause a delay between the load being applied and the angle of the wheels, but I also don’t know the ‘Vettes leaf spring arrangement at the back very well from a setup perspective. Do they still have a rear sway bar and if so, is that still stock? Rear ARB being too stiff could cause a similar thing.
"RamblinRover Luxury-Yacht" (ramblininexile)
02/23/2017 at 13:53, STARS: 1
You’re thinking that the Ackerman center is ahead of the rear axle to compensate for not-so-grabby tires and make the outside wheel bite? Interesting thought.
"rillweid - Now with more TRD and less TDI" (rillweid)
02/23/2017 at 13:53, STARS: 1
Not one people would think of but is easy to check so I will throw it in. Matt Farah had his steering wheel come loose to a similar effect.
"punkgoose17" (punkgoose17)
02/23/2017 at 14:16, STARS: 0
Because it is front mid-engined maybe the polar moment of inetia is less then he is used to, so the rotation of the car is quicker than expected.
"Textured Soy Protein" (texturedsoyprotein)
02/23/2017 at 14:33, STARS: 0
Could be one of several things:
Was he turning in under braking? Weight transfer to the front of the car could give increased turn-in.
Was he giving it throttle after turning in? The C6 has an LSD, maybe it was encouraging some power to the outside rear wheel under power which could make it feel like it was pulling thru the turn.
Was the road cambered in such a way to help the car turn in?
"Land_Yacht_225" (nadenator)
02/23/2017 at 15:53, STARS: 0
My guess is he has never been exposed to speed sensitive power steering tuned so aggressively before. I think the higher your speed, the more your inputs are exaggerated.
"MarquetteLa" (marquettela)
02/23/2017 at 16:42, STARS: 0
If he’s used to muscle cars and he’s only had the C6 for a few weeks...he may just not be used to actual grip and turning ability? I know my Miata on summer rubber has way more turn-in than any other car I’ve driven.
"Flyboy is FAA certified insane" (flyboy396)
02/23/2017 at 16:54, STARS: 0
Ah, yes. Pilot super sports on a sporty vehicle with wide tires driven by someone who has primarily driven non-sports cars. (From what you have presented)
When I let my roommate drive the crossfire he says he hated how much steering effort there was and how he had to correct a lot to keep it in a lane. He also said the exact same thing your friend said. He’s probably not used to cars with wider front tires.
On the crossfire if you turned really far one direction or the other, the car would start to pull the wheel towards the direction of turn. Just as described. Nothing was wrong with it, but that’s just what it did.