G37 Track Set Up. Oversteer Help.

Hotrodz · 02-03-2022, 05:41 PM

Quote:

Originally Posted by JARblue

Based on your build, there is nothing there that should throw off a solid track experience. As an aside, I think you need a good LSD to go along with the build. Good call on making adjustments to the alignment rather than throwing more parts at the car. It sounds like it was an improvement.

It's great to get all the best information from everyone on the internet that knows everything (that's not a jab at the guys posting here - they know their shìt for sure). But you are the driver and seat time will be your best friend to help you understand all of the recommendations from the guys on this thread so you can apply them appropriately to your situation. As you get faster, you'll be more in tune with the variables that affect your driving experience.

Jar is spot on!!! Find one or two people to put your faith in while listening to the rest. Not everything that works for one or many will work for you because of your driving style and the uniqueness of your car. Find others that track Gs and ask them for help. A couple that come to mind are @apexgarge and @g35_tracker on Instagram. Both are very fast and experienced.

2.2Lude · 02-14-2022, 06:09 PM

Quote:

Originally Posted by Rusty

Alignment spec's.
Front; camber -2, Caster +6, toe .06D in
Rear; camber -1.7, toe .06D in.
This will give you a set up that will live on both street and track.

Hey Rusty, are you toe recommendation each side or total toe?

I tried .04D in each side and the car now pushes like never before.

2.2Lude · 02-14-2022, 06:15 PM

Thanks for the input everyone else as well.

The car doesn't oversteer nearly as much anymore and pushes now on slower tighter corners. I'll play with the alignment settings more to find a good balance. I went with .04 in each side of toe upfront from 0 and that seems to have made a massive difference.

I did exactly what JARblue was recommending. Consulted an instructor of mine who races professionally and he helped me through it. He believes its the front toe adjustment that changed the handling soo much. Seat time has also been tremendously helpful in understanding the car.

I'm also going to look into grabbing a set of SPL front and rear end links before I get the car corner balanced. On my previous TSX corner balancing didn't make much of a difference at all, but that I wasn't as experienced of a driver and it was a completely different car/set up.

Rusty · 02-14-2022, 07:08 PM

Quote:

Originally Posted by 2.2Lude

Hey Rusty, are you toe recommendation each side or total toe?

I tried .04D in each side and the car now pushes like never before.

Total toe.

2.2Lude · 02-15-2022, 05:50 PM

Quote:

Originally Posted by Rusty

Total toe.

I had a feeling.

.08D in front and .22D in rear might be causing the pushing now.
I'll play with that.

2.2Lude · 02-16-2022, 12:55 AM

Quote:

Originally Posted by street2soul

Before you go down the spring/damper rabbithole, consider this a try:

For the mid corner snap oversteer, it appears to me your roll center may be too low, if your car is lowered especially in the rear. Car is transitioning to a sudden snap at the grip threshold because your rear rolls too suddenly and is not controlled. You may need to raise back the rear ride height and it will most likely improve rear slip consistency and improve snap oversteer

To me, it appears that for T1 corner, the oversteer is coming from trail braking not bleeding off enough while you're at full lock. I'm sure if roll center is your issue, that is contributing it to the oversteer happening at full lock while you are trailing off the brakes

I'm hoping this isn't an issue, I haven't had time to check rear travel either though. The main reason I hope it's not the roll center going Infinite is that would mean I need to start swapping Coilovers.

While not completely averse to it, I'd like to try and stay with my current set up if at all possible. The rear is at the Coilovers max allowable height and only a .8" drop from factory height with a 9k spring rate.

street2soul · 02-17-2022, 10:35 PM

Quote:

Originally Posted by 2.2Lude

I'm hoping this isn't an issue, I haven't had time to check rear travel either though. The main reason I hope it's not the roll center going Infinite is that would mean I need to start swapping Coilovers.

While not completely averse to it, I'd like to try and stay with my current set up if at all possible. The rear is at the Coilovers max allowable height and only a .8" drop from factory height with a 9k spring rate.

Do you have true coilovers or the oem style in the rear?

9K rear spring seems in the right range if it is in the OEM bucket location with 10k front spring rate. If you have 9K rear springs in true coilover style, that is way too high to match the 10k front. But I assume you're already aware of that.

2.2Lude · 04-04-2022, 05:19 PM

Quote:

Originally Posted by street2soul

Do you have true coilovers or the oem style in the rear?

9K rear spring seems in the right range if it is in the OEM bucket location with 10k front spring rate. If you have 9K rear springs in true coilover style, that is way too high to match the 10k front. But I assume you're already aware of that.

Yeah OEM divorced set up, for a true type the spring would probably closer to 6k.

2.2Lude · 04-04-2022, 05:42 PM

Update: Feels like I've got it all sorted now. Testing was done at Thunderhill West so I guess I'll really know next time I'm out to Laguna(Mid corner tuner 10 snap oversteer) but I think I'm good.

While technically within spec, I don't know where I got my previous .13 toe-in/each side value from but it was way too much. From educating myself more, talking with people I trust, and getting feedback from you guys I dialed the rear toe-in way down but had to run -2 degrees of camber on the factory eccentric bolts. So I grabbed some new camber arms, lockout bolt kit, and toe bolts to get everything exactly where I wanted it.

New specs:

-2.4 Front camber
0 toe

-1.5 Rear camber
0.03D Toe-in/each side

I previously tried .03D toe-in/each side upfront as recommended but the steering became too unresponsive for me, great on the freeway though. Zero road tracking.

Anyway with these settings and hot temps of 37 front/35 rear the car felt very balanced. Turns in nicely and the car stays planted throughout a corner, I'm 100x more comfortable in the car. I don't see myself really changing much on the suspension set up from here on out with few exceptions down the road. 200tw tires once the MPSS are done, adjustable end links and corner balance after corner weighing, and possibly a SPL anti bump steer kit as I feel some binding. Otherwise it's all seat time.

Beat my previously PB of 1:34 by 2 seconds

and even saw 1:31 on the predictive timer, just needs a better driver.

04-04-2022, 05:42 PM	#39 (permalink)
2.2Lude Base Member Join Date: Mar 2021 Location: CA Posts: 31 Drives: 12 Infiniti G37s 6MT Rep Power: 4	Update: Feels like I've got it all sorted now. Testing was done at Thunderhill West so I guess I'll really know next time I'm out to Laguna(Mid corner tuner 10 snap oversteer) but I think I'm good. While technically within spec, I don't know where I got my previous .13 toe-in/each side value from but it was way too much. From educating myself more, talking with people I trust, and getting feedback from you guys I dialed the rear toe-in way down but had to run -2 degrees of camber on the factory eccentric bolts. So I grabbed some new camber arms, lockout bolt kit, and toe bolts to get everything exactly where I wanted it. New specs: -2.4 Front camber 0 toe -1.5 Rear camber 0.03D Toe-in/each side I previously tried .03D toe-in/each side upfront as recommended but the steering became too unresponsive for me, great on the freeway though. Zero road tracking. Anyway with these settings and hot temps of 37 front/35 rear the car felt very balanced. Turns in nicely and the car stays planted throughout a corner, I'm 100x more comfortable in the car. I don't see myself really changing much on the suspension set up from here on out with few exceptions down the road. 200tw tires once the MPSS are done, adjustable end links and corner balance after corner weighing, and possibly a SPL anti bump steer kit as I feel some binding. Otherwise it's all seat time. Beat my previously PB of 1:34 by 2 seconds and even saw 1:31 on the predictive timer, just needs a better driver. street2soul, JARblue, Hotrodz and 1 others like this. Last edited by 2.2Lude; 04-04-2022 at 05:45 PM.

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02-14-2022, 06:15 PM	#33 (permalink)
2.2Lude Base Member Join Date: Mar 2021 Location: CA Posts: 31 Drives: 12 Infiniti G37s 6MT Rep Power: 4	Thanks for the input everyone else as well. The car doesn't oversteer nearly as much anymore and pushes now on slower tighter corners. I'll play with the alignment settings more to find a good balance. I went with .04 in each side of toe upfront from 0 and that seems to have made a massive difference. I did exactly what JARblue was recommending. Consulted an instructor of mine who races professionally and he helped me through it. He believes its the front toe adjustment that changed the handling soo much. Seat time has also been tremendously helpful in understanding the car. I'm also going to look into grabbing a set of SPL front and rear end links before I get the car corner balanced. On my previous TSX corner balancing didn't make much of a difference at all, but that I wasn't as experienced of a driver and it was a completely different car/set up.