Understeering with Grimmspeed front bar - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

EssJay · 03-07-2016, 03:53 PM

Just installed the Grimmspeed front tower bar. It's tough to tell yet if it feels sharper/more responsive but I definitely sense the understeer now. I'm wondering if a rear bar would correct this and restore the neutrality? Any other suggestions? It's a lease so I can't go too crazy.

jawn · 03-07-2016, 03:55 PM

Quote:

Originally Posted by EssJay

Just installed the Grimmspeed front tower bar. It's tough to tell yet if it feels sharper/more responsive but I definitely sense the understeer now. I'm wondering if a rear bar would correct this and restore the neutrality? Any other suggestions? It's a lease so I can't go too crazy.

Camber bolts and a front-end alignment. You can probably get to around -1 to -1.5 degrees with just camber bolts, which will be a nice improvement over the stock alignment.

EssJay · 03-07-2016, 04:12 PM

Quote:

Originally Posted by jawn

Camber bolts and a front-end alignment. You can probably get to around -1 to -1.5 degrees with just camber bolts, which will be a nice improvement over the stock alignment.

Sounds good but I'm not sure I want to alter/accelerate the treadwear. Looking to keep these Primacy summer rubbers for the duration of the 3yr lease period if possible (a guy can dream)

What about just adding the rear bar?

go_a_way1 · 03-07-2016, 04:18 PM

Quote:

Originally Posted by EssJay

Sounds good but I'm not sure I want to alter/accelerate the treadwear. Looking to keep these Primacy summer rubbers for the duration of the 3yr lease period if possible (a guy can dream)

What about just adding the rear bar?

Rear bar will only tighten the rear end up (less slop). I dont think your strut bar is making your car under-steer. It always did that but now that you added the bar you are driving into the corners harder and its just the placebo effect

Cole · 03-07-2016, 04:24 PM

Yeah, strut bars (front and rear) don't do a whole lot except for make you believe you can take a corner faster. It's not that the bar has made things that much stiffer, it's that you believe it did, so you're able to push more without that mental block kicking in.

1 or 2 degrees of negative camber shouldn't prematurely wear your tires down, either.

shellslinger · 03-07-2016, 04:27 PM

I think toe effects tire wear more than camber.

strat61caster · 03-07-2016, 04:39 PM

Quote:

Originally Posted by EssJay

Sounds good but I'm not sure I want to alter/accelerate the treadwear. Looking to keep these Primacy summer rubbers for the duration of the 3yr lease period if possible (a guy can dream)

What about just adding the rear bar?

If you're not tracking/autocrossing/drifting the mountain pass or doing >15k miles/year the Primacy's will last. -1.5 degrees of camber won't change that. Mine made it to 30k over about 2 years and I got rid of them because I thought the grip was gone for track/autox purposes (2x HPDE's, ~4x autox). They would have been fine for another year to 45k no problem even with more autox/track abuse.

go_away is right, the car understeered before, you just weren't hard enough into the corners to feel it until now.

jawn · 03-07-2016, 04:45 PM

Quote:

Originally Posted by EssJay

Sounds good but I'm not sure I want to alter/accelerate the treadwear. Looking to keep these Primacy summer rubbers for the duration of the 3yr lease period if possible (a guy can dream)

What about just adding the rear bar?

Rear bars aren't going to help much. I've had cars that had OEM alignment specs at -1.5 camber and never had a tire wear issue. Just make sure your toe is within factory specs and you'll be fine.

finch1750 · 03-07-2016, 04:49 PM

The strut bar didnt cause the understeer. This car understeers from factory. Add -1.5 camber up front and itll go away. Keep 0 toe and it'll be good for 3 years assuming you dont have a 45k mile lease lol

finch1750 · 03-07-2016, 04:50 PM

Quote:

Originally Posted by go_a_way1

Rear bar will only tighten the rear end up (less slop). I dont think your strut bar is making your car under-steer. It always did that but now that you added the bar you are driving into the corners harder and its just the placebo effect

exactly. see my sig

go_a_way1 · 03-07-2016, 04:56 PM

Quote:

Originally Posted by finch1750

exactly. see my sig

LOL yeah I remember reading that a while back and laughing my ass off.

NyC Zn6 · 03-07-2016, 05:07 PM

Quote:

Originally Posted by EssJay

Sounds good but I'm not sure I want to alter/accelerate the treadwear. Looking to keep these Primacy summer rubbers for the duration of the 3yr lease period if possible (a guy can dream)

What about just adding the rear bar?

How often do you drive your car?

boredom.is.me · 03-07-2016, 05:55 PM

Learning to drive my car fixed my understeer issues. This is even on a staggered setup with stock alignment. I don't understand why it's always the car's fault on this forum.

Where are you driving the car to experience this? How are you managing brakes, gas, and steering?

projek_01 · 03-07-2016, 06:02 PM

I'm not expert but I find that keeping my foot on the gas early on in corner helps with the under steer dramatically. Quite different to drive compared to a FWD Celica I used to drive.

03-07-2016, 03:53 PM	#1
EssJay Member Join Date: Feb 2016 Drives: '16 FR-S Halo White Location: Santa Barbara Posts: 35 Thanks: 33 Thanked 18 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Understeering with Grimmspeed front bar Just installed the Grimmspeed front tower bar. It's tough to tell yet if it feels sharper/more responsive but I definitely sense the understeer now. I'm wondering if a rear bar would correct this and restore the neutrality? Any other suggestions? It's a lease so I can't go too crazy.

03-07-2016, 04:49 PM	#9
finch1750 Undisputed El Presidente Join Date: Jun 2012 Drives: Zenki 37J ZN6 Location: Stockton, CA Posts: 11,593 Thanks: 9,403 Thanked 9,411 Times in 5,270 Posts Mentioned: 374 Post(s) Tagged: 33 Thread(s)	The strut bar didnt cause the understeer. This car understeers from factory. Add -1.5 camber up front and itll go away. Keep 0 toe and it'll be good for 3 years assuming you dont have a 45k mile lease lol __________________ "Just like how a strut bar somehow enables you to corner 20MPH faster around a cloverleaf on-ramp, when the reality is, you can do it already but you just don't have to balls to do it." - CSG David

03-07-2016, 06:02 PM	#14
projek_01 Senior Member Join Date: Oct 2012 Drives: 1996 ST204, Series 10 FR-S Location: Calgary, Alberta Posts: 253 Thanks: 89 Thanked 207 Times in 87 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	I'm not expert but I find that keeping my foot on the gas early on in corner helps with the under steer dramatically. Quite different to drive compared to a FWD Celica I used to drive. __________________

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03-07-2016, 04:24 PM	#5
Cole Not a troll Join Date: Apr 2015 Drives: FR-S Location: Canada Posts: 5,104 Thanks: 8,237 Thanked 5,399 Times in 2,694 Posts Mentioned: 266 Post(s) Tagged: 4 Thread(s)	Yeah, strut bars (front and rear) don't do a whole lot except for make you believe you can take a corner faster. It's not that the bar has made things that much stiffer, it's that you believe it did, so you're able to push more without that mental block kicking in. 1 or 2 degrees of negative camber shouldn't prematurely wear your tires down, either.

03-07-2016, 04:27 PM	#6
shellslinger Senior Member Join Date: Apr 2013 Drives: Whiteout FRS Location: DFW, TX Posts: 597 Thanks: 210 Thanked 310 Times in 186 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	I think toe effects tire wear more than camber.

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