Autocross (ASP) / track coilover dilemma

PharmDZ · 12-23-2015, 11:47 AM

Hey everyone. I'm trying to slowly build my Z to be as competitive as possible in A street prepared. Right now I'm running KW v3 coilovers but from my understanding the progressive coils are way too soft for the size and stickiness of the tires I run. I've been searching around and it seems that most of the more dedicated track suspension are true type coils. The issue is that I believe for ASP you much retain the original strut/spring setup in the rear. Anyone aware of any coils that may be able to do the job well but still retain this?

Zauskycop · 12-23-2015, 12:11 PM

Can't you just change to a non progressive spring setup? I'm sure KW would have the charts handy to let you know a "basic" setup to go to. You would lose the ride quality from the progressives, but have a better spring setup for autocross.

Tracy Ramsey

PharmDZ · 12-23-2015, 11:28 PM

I guess I can try to reach out to them to get that. From the bit of research I did the spring rates that I see recommended wouldn't match well with the dampening of the shocks on the KW V3's. Way back when it looks like someone rebuilt them, but he's not around anymore (Robispec?) and KW isn't willing to do anything custom with their coils.

Zauskycop · 12-24-2015, 06:39 AM

I guess it's then up to how much you want to spend...I was in the same boat years ago when I built up my DP MR2 Spyder....Custom all around and NOT cheap...

Tracy Ramsey

2011 Nismo#91 · 12-24-2015, 09:13 AM

I was looking at suspension setups a few months ago and basically I am ending up with stick with the Nismo springs or doing something custom which I am not willing to do.

Regular
F - 7.5kgf/mm (419lbs/inch)
R - 8.1kgf/mm (453lbs/inch)

Nismo
F - 8.6kgf/mm (480lbs/inch)
R - 9.3kgf/mm (520lbs/inch)

Tein S-tech
F 8.5kg (-0.9")
R 9.4kg (-0.7")

Eibach pro kit
F 8.6kg (-0.9")
R 9.5kg (-0.8")

H&R Sport
F ? (-1.3")
R ? (1.0")

Tanabe NF210
F 5.9kg (-0.8")
R 6.8kg (-1.0")

Tanabe GF210
F 8.8kg (-0.8")
R 9.1kg (-1.0")

Swift Spec-R
F 10.0kg (-1.2")
R 10.5kg (-1.0")
Spring Rates

Dcocci · 12-24-2015, 11:43 AM

I've been very happy with my custom valved and sprung BC racing BR's. I'm using swift springs. 14k front and 12k rear. I Autocross as well as trackdays. Running rs3's and soon to be running r-comps. For the price the BC's are a great buy.

PharmDZ · 12-24-2015, 01:05 PM

Quote:

Originally Posted by Dcocci

I've been very happy with my custom valved and sprung BC racing BR's. I'm using swift springs. 14k front and 12k rear. I Autocross as well as trackdays. Running rs3's and soon to be running r-comps. For the price the BC's are a great buy.

I was reading their website and it says that they're willing to upgrade the BR's to ER. I'm wondering if they're willing to work with you to provide correct valving and spring rates for keeping the rear shock and spring separate. Gonna shoot them an e-mail and let you guys know what they say.

03threefiftyz · 12-25-2015, 12:39 PM

Is this a serious build or just something to run locally? Any motorsports grade shock is going mean that you are going to have to source your own shock upper mounts, springs and rear spring adjusters.

PharmDZ · 12-25-2015, 06:17 PM

Quote:

Originally Posted by 03threefiftyz

Is this a serious build or just something to run locally? Any motorsports grade shock is going mean that you are going to have to source your own shock upper mounts, springs and rear spring adjusters.

I would like this to become a more serious build. Looks like I'll have to start digging around to create my own set if that's the case. For now I'll deal with the kw coils.

Dcocci · 12-26-2015, 04:47 PM

Quote:

Originally Posted by PharmDZ

I was reading their website and it says that they're willing to upgrade the BR's to ER. I'm wondering if they're willing to work with you to provide correct valving and spring rates for keeping the rear shock and spring separate. Gonna shoot them an e-mail and let you guys know what they say.

They do. Thats exactly what I did. I'm still oem
type rear setup for similar class rules.

redline10000 · 12-30-2015, 03:12 PM

I have a set of Proparts USA Konis and hyperco springs going up for sale if you are interested. I ran them in ASP this year and liked them a lot.

gomer_110 · 12-30-2015, 08:59 PM

I have AST 5200 series shocks on my ASP car. When I ordered them, I just had AST not build the rears with the springs on them. Paired those with some modified SPL mid-links and 2.5" ID springs and good to go.

If you plan on getting some custom valved shocks for this next season make sure you get on it soon as the delivery time can be quite long on some.

cjwsrt6 · 12-30-2015, 09:14 PM

Can I make a rude statement, could one really build an asp 370 and compete with an asp vette or some of the other highly modded asp cars?

gomer_110 · 12-30-2015, 09:17 PM

vette's are ssp. Real ASP competition are Evo's and STI's.

cjwsrt6 · 12-30-2015, 10:43 PM

Quote:

Originally Posted by gomer_110

vette's are ssp. Real ASP competition are Evo's and STI's.

Ok so boost buggies, either way can the z be that competitive in this class?
Heck even a well prepared m3 or Porsche will be tough in my eyes

12-23-2015, 11:47 AM	#1 (permalink)
PharmDZ Track Member Join Date: Jul 2012 Location: New Jersey Posts: 997 Drives: 11 Nissan 370Z BS M6 Rep Power: 13	Autocross (ASP) / track coilover dilemma Hey everyone. I'm trying to slowly build my Z to be as competitive as possible in A street prepared. Right now I'm running KW v3 coilovers but from my understanding the progressive coils are way too soft for the size and stickiness of the tires I run. I've been searching around and it seems that most of the more dedicated track suspension are true type coils. The issue is that I believe for ASP you much retain the original strut/spring setup in the rear. Anyone aware of any coils that may be able to do the job well but still retain this?

12-24-2015, 09:13 AM	#5 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,381 Drives: slowly Rep Power: 33858	I was looking at suspension setups a few months ago and basically I am ending up with stick with the Nismo springs or doing something custom which I am not willing to do. Regular F - 7.5kgf/mm (419lbs/inch) R - 8.1kgf/mm (453lbs/inch) Nismo F - 8.6kgf/mm (480lbs/inch) R - 9.3kgf/mm (520lbs/inch) Tein S-tech F 8.5kg (-0.9") R 9.4kg (-0.7") Eibach pro kit F 8.6kg (-0.9") R 9.5kg (-0.8") H&R Sport F ? (-1.3") R ? (1.0") Tanabe NF210 F 5.9kg (-0.8") R 6.8kg (-1.0") Tanabe GF210 F 8.8kg (-0.8") R 9.1kg (-1.0") Swift Spec-R F 10.0kg (-1.2") R 10.5kg (-1.0") Spring Rates Last edited by 2011 Nismo#91; 12-24-2015 at 09:18 AM.

12-24-2015, 11:43 AM	#6 (permalink)
Dcocci Base Member Join Date: Sep 2014 Location: Santa Barbara, CA Posts: 215 Drives: 2014 370z black 6spd Rep Power: 10	I've been very happy with my custom valved and sprung BC racing BR's. I'm using swift springs. 14k front and 12k rear. I Autocross as well as trackdays. Running rs3's and soon to be running r-comps. For the price the BC's are a great buy. __________________ -08 Porsche Cayman S

12-30-2015, 03:12 PM	#11 (permalink)
redline10000 Enthusiast Member Join Date: Nov 2012 Location: boston Posts: 265 Drives: 2011 370z sport Rep Power: 12	I have a set of Proparts USA Konis and hyperco springs going up for sale if you are interested. I ran them in ASP this year and liked them a lot. __________________ AAM Axleback + AAM Midpipe \| K&N Drop in filters \| Eibach Front Sway bar \|Whiteline diff bushing\| Dunlop ZII

12-30-2015, 08:59 PM	#12 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36940	I have AST 5200 series shocks on my ASP car. When I ordered them, I just had AST not build the rears with the springs on them. Paired those with some modified SPL mid-links and 2.5" ID springs and good to go. If you plan on getting some custom valved shocks for this next season make sure you get on it soon as the delivery time can be quite long on some. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

12-23-2015, 12:11 PM	#2 (permalink)
Zauskycop Base Member Join Date: May 2011 Location: Hinckley IL Posts: 228 Drives: 2012 370Z, '16 Miata Rep Power: 13	Can't you just change to a non progressive spring setup? I'm sure KW would have the charts handy to let you know a "basic" setup to go to. You would lose the ride quality from the progressives, but have a better spring setup for autocross. Tracy Ramsey

12-23-2015, 11:28 PM	#3 (permalink)
PharmDZ Track Member Join Date: Jul 2012 Location: New Jersey Posts: 997 Drives: 11 Nissan 370Z BS M6 Rep Power: 13	I guess I can try to reach out to them to get that. From the bit of research I did the spring rates that I see recommended wouldn't match well with the dampening of the shocks on the KW V3's. Way back when it looks like someone rebuilt them, but he's not around anymore (Robispec?) and KW isn't willing to do anything custom with their coils.

12-24-2015, 06:39 AM	#4 (permalink)
Zauskycop Base Member Join Date: May 2011 Location: Hinckley IL Posts: 228 Drives: 2012 370Z, '16 Miata Rep Power: 13	I guess it's then up to how much you want to spend...I was in the same boat years ago when I built up my DP MR2 Spyder....Custom all around and NOT cheap... Tracy Ramsey

12-25-2015, 12:39 PM	#8 (permalink)
03threefiftyz Track Member Join Date: Apr 2010 Location: MD Posts: 536 Drives: 03 350z 6mt Rep Power: 16	Is this a serious build or just something to run locally? Any motorsports grade shock is going mean that you are going to have to source your own shock upper mounts, springs and rear spring adjusters.

12-30-2015, 09:14 PM	#13 (permalink)
cjwsrt6 Enthusiast Member Join Date: Apr 2014 Location: Alabama Posts: 452 Drives: 2005 crossfire Srt6 Rep Power: 11	Can I make a rude statement, could one really build an asp 370 and compete with an asp vette or some of the other highly modded asp cars?

12-30-2015, 09:17 PM	#14 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36940	vette's are ssp. Real ASP competition are Evo's and STI's. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

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