: STS Lower springs (YES! cts stuff fits)



professor_speed
05-23-13, 11:03 PM
So I know a few people are looking to lower an STS but nothing is available. I looked over my buddies CTS-V2 and ever thing looked inter changeable to me. I have an 05 sts 4 with mag ride so your results may be a bit different.

I looked at what spring rates were available and decided to go with eibach CTS springs for Gen2 3.6. for the most part every thing went in as if it were made for the STS. Now there are multiple paths that can be taken depending on what you want I will cover what I know.

With the springs I used the car will sit low. I started with a front fender height of 28 1/2 and rear of 29 1/8. I went through a few stages. first with the springs in stalled and no modifications to the ride height sensors I ended up at 26 3/8 front and 28 3/4 rear. So the front dropped 2 1/8 and the rear 3/8 lol Damn air bags. I unhooked the rear ride sensors and zip tied them all the down. This makes the car think the back end is high and will deflate the bags to a minimum pressure. the rear droped to 27 1/2 or 1/5/8" drop. not bad but still above the front. I then cut one of the lower coils from the rear eibach springs and that got me to 26 3/4. Its low for sure but, even now. should Look great On 20's

Next I needed to re work my ride height sensor rods. based on the motion ratio one would need to lengthen them about 1/4" per 1" drop. so I added 1/2". (5.5") I popped off the plastic ball cups and used 1/4" threaded rod to make new rods, it cost me $1.49

The car rides fine its not bouncy but it is a bit more harsh on pot holes,rapid bumps and such. The body is well controlled I have no complaints.

In theory if a person wanted a 1" front drop and wanted to level the rear you could use either a stock cts front springs and either eibach rears with 1/4" longer rod or cut 3/4-1 coil from the stock cts rears. I would think ctsv springs would be a bit stiffer and better suited to the weight of the sts.

In all there are options to STS owners who want to lower there sts, it might be little work but hell the springs might be available for almost nothing.

good cts spring info here http://www.cadillacowners.com/forum/showthread.php/2257-Conversation-with-an-Eibach-Engineer

The only info I could find sts spring rates, non v models are said to be 10-20% softer. http://www.topspeed.com/cars/cadillac/2007-cadillac-sts-v-ar11514.html


Good luck Guys I hope this helps the guys that want to drop there STS.

1BadCadSTS
05-23-13, 11:23 PM
Too low for my tastes sounds like. Ill stick with trying to get a set of STSV springs

professor_speed
05-24-13, 08:32 AM
Yeah lots of STS owners are very modification conservative. The Cts-v2 springs may have a similar effect and will be way easier to find. might even be worth trying 1/4" longer rods for your rear ride height sensors. might drop the rear 1/2", I cant stand the ridicules rake these cars have stock. the body already has some what of a big but but then coupled with the rake makes butt second only to a C5

Ludacrisvp
05-24-13, 04:49 PM
but isn't it all about the butts?

Four Fins
05-25-13, 12:40 PM
So it sounds like my stock 06 FE1 springs can be swapped out easily with some eibach cts springs. Great news. Most importantly, wheres the pictures?

professor_speed
05-25-13, 01:48 PM
but isn't it all about the butts?

Like Sir-mix-alot, I can not Lie

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So it sounds like my stock 06 FE1 springs can be swapped out easily with some eibach cts springs. Great news. Most importantly, wheres the pictures?

Here you go I hope you like it low. but like I said stock cts-v2 stuff should be about 1 inch less of a drop. sorry it rained about an hour ago so the ride is a bit dirty.

http://i179.photobucket.com/albums/w315/professor_speed/DSCN1306_zps8911c646.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1306_zps8911c646.jpg.html)
http://i179.photobucket.com/albums/w315/professor_speed/DSCN1307_zps3f3729ed.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1307_zps3f3729ed.jpg.html)
http://i179.photobucket.com/albums/w315/professor_speed/DSCN1308_zpsf631db1e.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1308_zpsf631db1e.jpg.html)
http://i179.photobucket.com/albums/w315/professor_speed/DSCN1309_zpscea71376.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1309_zpscea71376.jpg.html)


New theme song lol
https://www.youtube.com/watch?v=Zw-zCELtfVw

Four Fins
05-26-13, 09:11 PM
That looks sweet, would be dope with 20's. I like low, nearly every vehicle I've owned has been lowered or on air.

zlgibby
05-27-13, 01:52 PM
It looks gorgeous. Can I get a ballpark price range what it cost you?

professor_speed
05-27-13, 09:03 PM
Thanks Guys, springs were less than $300 iirc threaded rod cost $2 also in hind site I shout have cut the front bump stops. I guess the cts guys do it to keep the front font from squeaking and bottoming out. but its no big deal I will do it next week, I can get the struts out in under 15 mins now. Also it occasionally throws a suspension code now. I'm going to lengthen the front ride height rods and see if that helps. I also have a set of 20x9 front and 20x11 (5.5" lip) rears I'm trying to get to work the off set is pretty agressive +13 both. I have a fender roller that should be here this week so I can pull the fenders.

STS Serge 172
05-28-13, 01:19 PM
Drop is looking mighty! Good wrk on being a pioneer!

Nice wheel size! I been doing some research and trying to source an airbag sispension and I got a solid lead--in the meantime I wanted to see what kind of wheels I could fit but will be difficult to determine without having the drop in place.

From what I measured fitting a 20X10+ will require to run some higher offsets :/ if all my measurments are accurate I plan on running something along the lines of: Front--20X10 +32 Rears--20X11 +39; this is at 0 camber th0, I'm sure it'll change once dropped.

Again without the drop it's hard to determine but that's my plan till I source the airbag suspension.


I look forward to see how the +13 offset fits--the fenders on the STS are already flat (rolled) on the inside so pulling them would be the next step for sure. Keep us posted!

williestacks
06-02-13, 12:20 AM
Thanks Guys, springs were less than $300 iirc threaded rod cost $2 also in hind site I shout have cut the front bump stops. I guess the cts guys do it to keep the front font from squeaking and bottoming out. but its no big deal I will do it next week, I can get the struts out in under 15 mins now. Also it occasionally throws a suspension code now. I'm going to lengthen the front ride height rods and see if that helps. I also have a set of 20x9 front and 20x11 (5.5" lip) rears I'm trying to get to work the off set is pretty agressive +13 both. I have a fender roller that should be here this week so I can pull the fenders.


so you're saying CTS V2 factory and/aftermarket suspension components work? as if I were to purchase coil overs for the CTS V2 they would fit on my 06 STS? (non mag/air)

DBB
06-13-13, 09:57 AM
What are the factory rake/ front and rear ride height settings for a 2005 STS V6 FE1 soft ride suspension? How much higher should the rear sit vs. the front?

EChas3
06-13-13, 08:59 PM
My wife's car is 28.5" to the top of all 4 wheelwells on OEM 17" wheels. It's Summer, so the tires are Conti DW 235/50R17. It's a 2007 with FE1 with some other suspension options that may be unique to fleet/rentals (listed below).

For comparison, my 2006 AWD 1SG on Conti AWS 235/50R18 w' F55 & FE3 (Sport + MRC) is 29" in front and 28" in back. I do run the back tires about 2psi lower but that is its usual stance, anyway.

2007 suspension RPO's
6LJ - SUSPENSION
7LJ - SUSPENSION COMPONENT
8HC - COMPONENT SUSPENSION
9HC - COMPONENT SUSPENSION
FCH - HERTZ RENT A CAR
FE1 - 4 WHEEL INDEPENDENT SUSPENSION
FLT - FLEET PROCESSING OPTION
GU2 - AXLE REAR, 2.73 RATIO
JJA - PT DRESS SUBASSEMBLY INSTALLED
JJD - I/P SUBASSEMBLY NOT INSTALLED
JJL - SUSPENSION FRONT NOT INSTALLED
JJM - SUSPENSION REAR NOT INSTALLED

is3_ftw
06-13-13, 11:42 PM
so you're saying CTS V2 factory and/aftermarket suspension components work? as if I were to purchase coil overs for the CTS V2 they would fit on my 06 STS? (non mag/air)
If I'm correct on this, the springs are placed over the stock shocks. So ur still using the same top and bottom mounting points. Where the CTS coilovers might have a different mounting points and will not fit on the STS.

DBB
06-14-13, 04:19 AM
My wife's car is 28.5" to the top of all 4 wheelwells on OEM 17" wheels. It's Summer, so the tires are Conti DW 235/50R17. It's a 2007 with FE1 with some other suspension options that may be unique to fleet/rentals (listed below).

For comparison, my 2006 AWD 1SG on Conti AWS 235/50R18 w' F55 & FE3 (Sport + MRC) is 29" in front and 28" in back. I do run the back tires about 2psi lower but that is its usual stance, anyway.

2007 suspension RPO's
6LJ - SUSPENSION
7LJ - SUSPENSION COMPONENT
8HC - COMPONENT SUSPENSION
9HC - COMPONENT SUSPENSION
FCH - HERTZ RENT A CAR
FE1 - 4 WHEEL INDEPENDENT SUSPENSION
FLT - FLEET PROCESSING OPTION
GU2 - AXLE REAR, 2.73 RATIO
JJA - PT DRESS SUBASSEMBLY INSTALLED
JJD - I/P SUBASSEMBLY NOT INSTALLED
JJL - SUSPENSION FRONT NOT INSTALLED
JJM - SUSPENSION REAR NOT INSTALLED

Thanks!

professor_speed
06-24-13, 06:39 PM
Ok guys I have some updates and more info that may help those that want to lower there sts or sts-v. Again all my info is based off my own car so you experience may vary a bit.

Cts gen 2 springs will work and have been working well in my car there are four types of springs that I have info on

STS stock Front 364 lbs linear rear 388 linear (estimated based on 15 less stiff than STS-V)
STS-V stock Front 428 lbs linear Rear 456lbs linear
1. stock cts-v springs Front -0.650 rear +0.350 400lbs linear front and rear from what I can tell
2. Eibach cts-v sedan springs Front -1.250 400-457lbs progressive rear -0.750 (or 1.375 one coil cut) 331-605lbs progressive
3. Eibach cts-v coupe springs Front -1.875 400-457lbs progressive rear -1.375 (one rear coil cut) 331-605lbs progressive
4. Eibach cts v6 springs Front -1.875 400-514lbs progressive rear -1.375 (one rear coil cut) 274-582lbs progressive (what I run)

Notes:
-front bump stops must be cut!, If you don't expect a bounce squeaky ride.
-Cut the bump stops at the first convolution.
-I used anti seize in the bump stop between the foam and metal collar to prevent and squeaks. (I have no squeaks)
-If you have air bags or MRC you must lengthen your ride height rods front and rear.
-Currently I added 3/8 to the front and 5/8 to the rear.
-If nothing is done to the rear the air bags will lift the car back to near stock
-If nothing is done to the front it will throw a "service suspension" code, the front shocks freak out and groin then go in to limp mode (softest setting)
-If you have Nivomat rear shocks You need to modify the mounting point of the shock an amount equal to the expected drop to keep them from pumping back up (I have no more info on how to cause I don't have those shocks sorry)

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http://i179.photobucket.com/albums/w315/professor_speed/DSCN1324_zpsfe464502.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1324_zpsfe464502.jpg.html)
http://i179.photobucket.com/albums/w315/professor_speed/DSCN1323_zps80cf8942.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1323_zps80cf8942.jpg.html)
http://i179.photobucket.com/albums/w315/professor_speed/DSCN1320_zps0d3872ed.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1320_zps0d3872ed.jpg.html)
http://i179.photobucket.com/albums/w315/professor_speed/DSCN1319_zps07cd305b.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1319_zps07cd305b.jpg.html)
http://i179.photobucket.com/albums/w315/professor_speed/DSCN1318_zpsc72aef82.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1318_zpsc72aef82.jpg.html)
http://i179.photobucket.com/albums/w315/professor_speed/DSCN1314_zpsedee5e22.jpg (http://s179.photobucket.com/user/professor_speed/media/DSCN1314_zpsedee5e22.jpg.html)
2005 STS 20x10 front 255/35/20, 20x11 rear 285/30/20 +35 offset both Varrstoen es1 wheels

williestacks
06-30-13, 04:21 PM
to professor_speed and others with the knowledge,


that drop looks awesome. I totally plan to go the same route you did with the CTS V2 springs. but by saying V2, you mean VERSION 2? or the 2nd gen CTS V model? im assuming you mean the 2008-2011 CTS NON-V model? just trying to get a little clarification before I purchase.

I have found lowering springs for the STS-V and I planned to just cut an extra coil or two, but I imagine for the V model they are intensely too stiff as is, so id rather stay away from springs meant for V models. Id totally prefer coilovers, or even coil-over-air. as having a pneumatic system would be awesome but the only thing I can find is universal air bag kits, the "air struts" are old style two bellow bags. im looking more for air-rods that keep suspension body roll stiff like coilovers and rides soft as the factory suspension. hence why coil-over-air is the best setup possible today. but its 5k+ investment and im sure the CTS and STS upper and lower strut tower mounts are completely different.

so with saying all that unless anyone has any info on other options I think ill go with the CTS V2 springs (assuming you mean the 2nd gen CTS base model) love the wheel combo as well. I was going for the same sizing but im glad I got to see what +35 offset looks like and im digging it. I was really unsure how far to go on the offset since I plan to drop my STS to nearly an undrivable state. I plan for it to be on the GROUND. if you have any words of advice id appreciate it.

also, with the +35 offset, say I lowered my rear another 2 inches than your photos show. regardless of the tires, but with +35 offset will the lip of the wheels tounch the fender? or tuck? im gonna guess id have a little neg camber going even lower so theyd probably tuck, and that's the look im going for.

thanks for any help. and your STS looks great.

professor_speed
06-30-13, 11:28 PM
I put spring rates, how much you can expect the car to be lowered with various cts-v sedan, cts-v coupe, cts v6 and stock cts-v (all generation 2) If you try to go 2" lower than I did, you will need non factory front struts, you will have no travel otherwise and it will ride like crap. The way the suspension works camber does not add much clearance. +35 offset question will depend on wheel width. 9" wide +35 will probably tuck fine. My wheels are pretty aggressive as far as width and tucking them any more might cause rubbing. I have no rubbing with my set up.

STS Serge 172
07-01-13, 03:11 PM
So I see you didn't go with the +13 offset afterall with you're fairly wide wheels lol I was curious to see how you were gonna manage to fit those under stock fenders and neutral camber--either way, your STS is on point! I luv it! Flush! just what I'm aiming for!

I do have a few questions--was camber not effected after the drop? Seems like the front might have just a bit but the rear not much at all?

professor_speed
07-01-13, 03:27 PM
Yeah camber is affected. I still need an alignment. Camber is not the real problem though, these cars run 0 camber from the factory so even with a drop I was at about 1.5 front and 2 degrees rear. The big problem is the rear toe curve, the car jump around over bumps. I just reset the camber to help with the rear toe curve, but I have not done a full alignment yet. I still want to wait for my hub rings for the wheels. (these wheels are 5x114.3 not 5x115 so there is small oscillation until the rings arrive. Right now the fronts are flush and the rear is over flush by about 15mm but with the stretch I have its perfect. I will probably run about 1 degree neg camber front and rear, I wanted the car lower but to drive 99% the same. (which it does) The 20x11 +13 was just too much I would say 11 wide with a 35 offset is right on the money for the rear.

ITSQUIK
07-01-13, 09:06 PM
I'll post the info once I find out, but I am in the process of trying to get custom built front air ride struts & rear air ride shocks to be able to have adjustable ride height. Obviously, everyone knows the suspension Mods for our cars is Extremely Limited!!!! This is how mine sits now on Staggered 22's, 22x11 rear with a 295/25/22. She is actually in the body shop now having some serious custom work done. I'm flaring the 1/4 panels out slightly to tuck a 22x13 rear with a 325/20/22, smoothing the rear bumper, molding in the V-coupe exhaust, & a bunch of other little mods to make it Unique!! I'll post those pics as soon as she's out!!

http://i219.photobucket.com/albums/cc129/02DSGHD/A0AA8A63-21EA-4242-800C-14DF93F70CFD-6756-0000093782374918.jpg

Guy.Seminerio
07-01-13, 10:29 PM
Very beautiful car.

ITSQUIK
07-01-13, 10:36 PM
Very beautiful car.

Thank you Very Much!!

STS Serge 172
07-03-13, 12:01 PM
Yeah camber is affected. I still need an alignment. Camber is not the real problem though, these cars run 0 camber from the factory so even with a drop I was at about 1.5 front and 2 degrees rear. The big problem is the rear toe curve, the car jump around over bumps. I just reset the camber to help with the rear toe curve, but I have not done a full alignment yet. I still want to wait for my hub rings for the wheels. (these wheels are 5x114.3 not 5x115 so there is small oscillation until the rings arrive. Right now the fronts are flush and the rear is over flush by about 15mm but with the stretch I have its perfect. I will probably run about 1 degree neg camber front and rear, I wanted the car lower but to drive 99% the same. (which it does) The 20x11 +13 was just too much I would say 11 wide with a 35 offset is right on the money for the rear.

The OEM components have that much adjustability in camber? I dont mind running -1 to -2 camber (im currently running -3.5 on my accord :p ).

On my pervious post on the 1st page I stated that 20X11 +39ish is what I was aiming for--my calculations were pretty close but I knew it wouldnt be perfect without knowing the actual drop.

Thanks for the clarification! But are you gonna switch up your tire size from the current setup? I like how they mildly stretch.



Are these the ones you used:

http://performance-suspension.eibach.com/performance_suspension/buy_online

If it is in fact the 08+ these should wrk also?

http://www.ebay.com/itm/H-R-LOWERING-SPORT-SPRINGS-SET-CADILLAC-CTS-SEDAN-/170912224227?pt=Motors_Car_Truck_Parts_Accessories&hash=item27cb2993e3&vxp=mtr#ht_1952wt_1396

Or is it 03-07 V6?

http://www.ebay.com/itm/EIBACH-PRO-KIT-LOWERING-SPORT-SPRINGS-03-07-CADILLAC-CTS-V6-MODELS-1-2-F-DROP-/330950182215?pt=Motors_Car_Truck_Parts_Accessories&fits=Make%3ACadillac%7CModel%3ACTS&hash=item4d0e2b0547&vxp=mtr#ht_2686wt_1091

Sorry for the all questions :/

professor_speed
07-05-13, 11:07 PM
I used 08+ eibach v6 springs

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20x11 +39 should work 4mm is not much, Im not changing tires any time soon, this was the look I wanted. with a 20" wheel it will run into the sway bar and toe link if you run too much off set (higher numbers) with a 22 you have more clearance. its really only an issue at full drop. the wheels swings away as the arms move up.

STS Serge 172
07-08-13, 11:44 AM
I used 08+ eibach v6 springs

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20x11 +39 should work 4mm is not much, Im not changing tires any time soon, this was the look I wanted. with a 20" wheel it will run into the sway bar and toe link if you run too much off set (higher numbers) with a 22 you have more clearance. its really only an issue at full drop. the wheels swings away as the arms move up.

Yes; when I was taking measurements, I noticed the sway bar was the nearest of all things to touch 1st.

With, +22, it would infact bring it away from the inside but cause more poke--so a 20X11 +22 is prob too much as you have stated.

Anyhow, all-in-all, great work! Love the stance and I think I might attempt this with the H&R springs if I don't hear back from airbagit.com soon.

Thanks again for your time!

STS Serge 172
07-24-13, 02:02 PM
Any update boss??

How is she riding? Alignment specs?

professor_speed
09-15-13, 09:47 AM
No real problems, I'm happy with the car. It looks fantastic the pics do not do it justice. The car gets comments and looks everywhere it goes. Especially because the Girl drives it most times. She says The car has intimidated the guys at the gym they don't hit on her anymore. I think they feel she is too far out of their league, lol

EChas3
09-15-13, 03:04 PM
Sweet!

jdm23
08-28-14, 12:10 AM
Has anyone put the stock cts springs on? I have 22in wheels and just need about a inch.