Spring Rates - Track / Autocross - Page 5 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Racecomp Engineering · 05-06-2013, 11:53 PM

Quote:

Originally Posted by ayau

I'm running on 500/650 right now. After 2 autocross the events, the back was very loose. It could also be the fact that the parking lot was VERY bumpy. IDK.... I still need to test the rates at an actual track to see how it feels.

The problem is that I sort of want to have a hybrid setup by using the same rates for both track and autox. I just don't think it will work, idk. I think I'm a little frustrated right now lol.

What's the consensus on stiffer rear? It seems like we still don't have a solid answer.

There is no one answer...more than one way to skin a cat. With 500/650 you are taking a route that requires a driver that has a lot of commitment and confidence with an oversteering car. And maybe no rear swaybar.

It's not the way we would go about things for an auto-x or track car to be honest unless it was a very focused car. Going without a rear sway and going heavy on the rear rate can work well but you'll give up some street comfort.

- andy

Dezoris · 05-07-2013, 12:48 AM

Quote:

Originally Posted by ayau

I'm running on 500/650 right now. After 2 autocross the events, the back was very loose. It could also be the fact that the parking lot was VERY bumpy. IDK.... I still need to test the rates at an actual track to see how it feels.

The problem is that I sort of want to have a hybrid setup by using the same rates for both track and autox. I just don't think it will work, idk. I think I'm a little frustrated right now lol.

What's the consensus on stiffer rear? It seems like we still don't have a solid answer.

Yeah dude I think the consensus is you want even or less stiff rear spring on this car. If you are committed to it you could like mentioned dump the rear bar add a stiffer front bar, but you are going to have to feel your way through it.

CSG Mike · 05-07-2013, 12:52 AM

Quote:

Originally Posted by Dezoris

Yeah dude I think the consensus is you want even or less stiff rear spring on this car. If you are committed to it you could like mentioned dump the rear bar add a stiffer front bar, but you are going to have to feel your way through it.

We run stiffer rear springs, as do quite a few local drivers...

Anyone who's gotten a ride in our car can vouch that the car is not the crazy oversteery machine that everyone makes it out to be.

Dezoris · 05-07-2013, 01:23 AM

Quote:

Originally Posted by CSG Mike

We run stiffer rear springs, as do quite a few local drivers...

Anyone who's gotten a ride in our car can vouch that the car is not the crazy oversteery machine that everyone makes it out to be.

You are a totally different case, tuned prepared for specific tracks but before I really put my foot in my mouth I dont think ayau said what events he is running.

CSG Mike · 05-07-2013, 01:42 AM

Quote:

Originally Posted by Dezoris

You are a totally different case, tuned prepared for specific tracks but before I really put my foot in my mouth I dont think ayau said what events he is running.

We run the same setup for every track... except for WSIR where we lower the damper settings (to a more rotation friendly setup) because I wussed out after nearly understeering off track at 120+ mph.

Yes, 10k/12k understeers at speed.... :p

Dezoris · 05-07-2013, 03:10 AM

Quote:

Originally Posted by CSG Mike

We run the same setup for every track... except for WSIR where we lower the damper settings (to a more rotation friendly setup) because I wussed out after nearly understeering off track at 120+ mph.

Yes, 10k/12k understeers at speed.... :p

You can get away with that with the right track setup. The more grip you have the more its usable Just have to see what he does. Out by me running a 650/750lb springs would be horrible in autox and with how roads are it would make daily driving punishment even with amazing damping.

Id love to see you autox your setup just once

GTM_Challenge · 05-07-2013, 12:06 PM

I'll be swapping the springs on our KW Clubsports this evening. Had another suspension going on but had some fitment issues, so we will be taking advantage of the downtime to experiment more.

Racecomp Engineering · 05-07-2013, 12:08 PM

Quote:

Originally Posted by CSG Mike

We run stiffer rear springs, as do quite a few local drivers...

Anyone who's gotten a ride in our car can vouch that the car is not the crazy oversteery machine that everyone makes it out to be.

I bet after you finally replace some of the stock bushings, you'll have a bit more oversteer.

Do it! Can't believe you haven't already...it's a big difference.

- Andy

celica73 · 05-07-2013, 02:14 PM

Has anyone checked the rear bumpsteer (and want to share). I might switch rear springs soon, so maybe I'll give it a go.

Dave-ROR · 05-07-2013, 03:30 PM

Quote:

Originally Posted by ayau

I'm running on 500/650 right now. After 2 autocross the events, the back was very loose. It could also be the fact that the parking lot was VERY bumpy. IDK.... I still need to test the rates at an actual track to see how it feels.

The problem is that I sort of want to have a hybrid setup by using the same rates for both track and autox. I just don't think it will work, idk. I think I'm a little frustrated right now lol.

What's the consensus on stiffer rear? It seems like we still don't have a solid answer.

BTW what were your alignment settings?

CSG Mike · 05-07-2013, 03:39 PM

Quote:

Originally Posted by Dezoris

You can get away with that with the right track setup. The more grip you have the more its usable Just have to see what he does. Out by me running a 650/750lb springs would be horrible in autox and with how roads are it would make daily driving punishment even with amazing damping.

Id love to see you autox your setup just once

I would too

Just difficult to justify to the boss how him paying $40 for me to get 4 runs is beneficial to the company versus paying $100-150 for 2 hours of track time...

Dezoris · 05-07-2013, 04:13 PM

Quote:

Originally Posted by CSG Mike

I would too

Just difficult to justify to the boss how him paying $40 for me to get 4 runs is beneficial to the company versus paying $100-150 for 2 hours of track time...

I hear you man, it totally blows. The only way it would be good is if you set up an event like you did for track days for autox.

ayau · 05-07-2013, 04:18 PM

Quote:

Originally Posted by Dave-ROR

BTW what were your alignment settings?

Haven't had a chance to get an alignment yet. I'm at about a 1" drop all around and the front top plates are set for max camber with crash bolts.

I'd guess that the front has about -3.4 of camber and the rear has -2.3. The toes are probably messed from dropping it about an inch.

xwd · 05-07-2013, 04:21 PM

Before you even look at anything like spring rates, get a proper alignment... it could be way way off for all you know. Was your car aligned before with just the crash bolts?

I would look at disconnecting the rear swaybar if you really want to run rates that high.

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05-07-2013, 12:06 PM	#63
GTM_Challenge Join Date: Aug 2012 Drives: On track Location: Chicago Posts: 527 Thanks: 120 Thanked 285 Times in 166 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	I'll be swapping the springs on our KW Clubsports this evening. Had another suspension going on but had some fitment issues, so we will be taking advantage of the downtime to experiment more.

05-07-2013, 02:14 PM	#65
celica73 Senior Member Join Date: Jun 2012 Drives: '13 BRZ / '11 Outback / '06 Tundra Location: Durham NC Posts: 510 Thanks: 6 Thanked 155 Times in 104 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Has anyone checked the rear bumpsteer (and want to share). I might switch rear springs soon, so maybe I'll give it a go.

05-07-2013, 04:21 PM	#70
xwd Senior Member Join Date: Feb 2012 Drives: 2013 DGM Subaru BRZ (Subie #9) Location: ATL, US Posts: 2,667 Thanks: 123 Thanked 861 Times in 552 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	Before you even look at anything like spring rates, get a proper alignment... it could be way way off for all you know. Was your car aligned before with just the crash bolts? I would look at disconnecting the rear swaybar if you really want to run rates that high.

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