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Note that the Z0K on a base model is different than the Z0K on a GXP.

See the table in message #1 of this thread.

When the base Z0K was brought out, the GXP had not been introduced yet.

:thumbs:

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Between your posts I reread, and learned some stuff, but not enough! lol. What I trying to discern is 'the kit" an upgrade in handling improvement over my stock FE3 GXP , or less? If it's better than my stock FE3 GXP (LNF), but below a ZOK LNF package, that's okay. But if it's less than what I have stock, then I would consider aftermarket stuff and just retain all my stock stuff.
 

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I'd go for the ZOK rear bar. Buy the front one, but those who do solo events have said they prefer the sifter stock front. If you don't buy the front you may not be able to get one later as they will become scarce. I use the front bar as well on the street and like it.

I wouldn't even think about keeping stock shocks. I, and several others, have used the BC Racing which are adjustable for height and stiffness and seem to work very well indeed.

If and when you do decide to do events, look at a slightly more aggressive suspension alignment. I figured that my tires would age out before I ever put enough miles on the cars to wear them out, so I run the more aggressive settings on the street and like them.
I read this several times and was reading "stiffer" at your "sifter" typo. It finally made sense when I read it as "softer"... correct?
 

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I read this several times and was reading "stiffer" at your "sifter" typo. It finally made sense when I read it as "softer"... correct?
"Softer" is how I read it, so I'd assume that's what Bill meant. "O" and "I" are next to each other on the keyboard. It's a typo!

:thumbs:

.
 

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Between your posts I reread, and learned some stuff, but not enough! lol. What I trying to discern is 'the kit" an upgrade in handling improvement over my stock FE3 GXP , or less? If it's better than my stock FE3 GXP (LNF), but below a ZOK LNF package, that's okay. But if it's less than what I have stock, then I would consider aftermarket stuff and just retain all my stock stuff.
I'd love to be able to answer that question, but I can't.

That's my simple answer. I'm sure that someone here can interpret the table for you.

:dunno:

.
 

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"Softer" is how I read it, so I'd assume that's what Bill meant. "O" and "I" are next to each other on the keyboard. It's a typo!

:thumbs:

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But Dave... can you answer my queries to you above? :wink:
 

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The Z0K suspension for the NA car is the GXP standard suspension, and it will improve from the standard NA suspension. It will behave similar to a GXP minus the power, but you MUST have ALL the components ie
shocks, sway bars, but also throw in the 3 brace kit from DDM or it will not be complete. One last note if you have the OEM tires they MUST be replace or this exercise would futile.
 

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I have been asked by several people to clarify which parts make up which of the suspension levels. Here is a compilation of this information, with spring rates and loads.

I hope people understand what a check height and check load mean for a spring. The check height is not the same spring length as any particular loading.

Some definitions:
LE5 = Base naturally aspirated 2.4l engine
LNF = 2.0l turbo SIDI
SDT = Street Edition
FE2 = the option code for the base suspension
FE3 = option code for uplevel suspension

You will notice that the SKY LE5 front spring has a higher load. In general, the SKY is slightly heavier due to option content, differences in structural mass, etc. and requires a slightly higher load spring to keep the trim height in specification.

Code:
Application				Front Spring 				Rear Spring
			Frt Shock	(chk ht. = 		Rear Shock	(Chk ht. = 	
					211.5mm)				217.5 mm)
=====================================================================================================

FE2 LE5 Solstice	15278695*	15244327		15278696*	15280026
2006 MY			Code 9??*	(3600N - 22.5 N/mm)	Code 9??*	(3700N - 31.0 N/mm) 	
					[Tag = Lt Grn]				[Tag = Tan]
=====================================================================================================
FE2 LE5 Solstice	15224875	15244327		15236924	15280026
2007+MY			Code C404	(3600N - 22.5 N/mm) 	Code C406	(3700N - 31.0 N/mm) 	
					[Tag = Lt Grn]				[Tag = Tan]	
=====================================================================================================
FE2 LE5 SKY		15224875	10376421		15236924	15280026
			Code C404	(3800N - 22.5 N/mm) 	Code C406	(3700N - 31.0 N/mm) 	
					[Tag = Dk Grn]				[Tag = Tan]	
=====================================================================================================					
FE3 LNF (Non Z0K)	15901220	15784872		15901221	25787858
(All Non-Z0K LNF Kappa)	Code C646	(3800N - 30.5 N/mm) 	Code C648	(3900N - 40.0 N/mm)	
					[Tag = Brown]				[Tag = Purp Stripes]	
=====================================================================================================
LE5 Z0K Solstice	15901220	15906534		15901221	15906532
also Street Ed. SDT	Code C646	(3100N - 30.5 N/mm) 	Code C648	(3250N - 40.0 N/mm) 	
					[Tag = Lt Grn Stripes]			[Tag = Lt Blu Stripe]	
=====================================================================================================
LNF Z0K Solstice	15901220	25849163		15901221	25855626
			Code C646	(3100N - 37.0 N/mm) 	Code C648	(3200N - 50.0 N/mm)	
					[Tag = Orange Stripes]			[Tag = Yellow Stripe]	
=====================================================================================================
GM SPO Perf Parts	88965295	88965293		88965296	88965294
			Code C388	(3450N - 37.0 N/mm)	Code C390	(3350N - 50.0 N/mm)	
					[Tag = White]				[Tag = Lavender]	
=====================================================================================================

* The 2006 Solstice had a different shock valving and shorter jounce bumper with a different rate progression.
The 2007 FE2 SKY, introduced early 2006, had a revised jounce bumper and a better shock valving to work with the new jounce bumper.
This was well-received, so the changes were rolled into the FE2 Solstice in 2007 model year and parts commonized.
The 2006 shocks are not available in service, both old and new jounce bumper are available in service.
2006 Solstice are all FE2 and all have the 15159045 jounce bumper.  All 2007+ kappa have the 15823830 Jounce bumper.


			Front 		(2) Frt		Rear		(2) Rear 
			Stab Bar	Insulator	Stab Bar	Insulator
===================================================================================================
FE2 LE5			10342785	15887219	10342786	10350105
			27.2 x 4.5mm	27.2mm		24.2 x 3.0mm	24.2mm
===================================================================================================
FE3 LNF Non-Z0K		15224873	25789241	15224878	15224881
& LE5 Z0K		33.3 x 4.5mm	33.3mm		25.4 x 3.0mm	25.4mm
& SDT (street edition)
GM SPO Perf Parts							
===================================================================================================
FE3 LNF Z0K		25855621	25789241	25855622	25855623
			33.3 x 6mm	33.3mm		27.2 x 6mm	27.2mm
									Also needs
									25855624 clamps
===================================================================================================
I also added it as a txt file.

The shocks have a sticker on them with a code. Springs usually have a tag that is a specific color and has the part number of the spring on it.

Also, keep in mind that the Z0K (both LE5 and LNF versions) are built with two spring seats. Out of the factory, the trim height is within specification with both spring seats, which was necessary due to several areas in the assembly plant that prevented a lower car from getting through the system, as well as shipping limitations at the intended ride height. It is up to the owner to remove this 2nd spring seat/spacer to set the car to intended carrying height. This option was lower cost when compared to other options, such as lifts and/or disposable spring stuffers.

You will also notice that the same shock is used for the LNF Z0K as is used for the lower spring rate cars. This shock is not fully optimized for these higher spring rates, and the GMPP shocks will be closer but oriented toward heavier rebound damping than is necessary for the increased spring rate, and significantly tighter bypass (bleed), which is typically more desirable for autocrossing vs. street usage or road racing. It is assumed that anyone buying an LNF Z0K for T2 or serious AS autocross would be replacing stock shocks, no matter how they are tuned, with their own choice in Penskes, Olins, Konis or other racing or adjustable shocks.
I just discovered today that our 2006 1st 1000 had a right front FE3 LNF spring (I'm assuming it also has a FE3 LNF shock too). 2006s had the FE2 suspension and build date was 8/18/05. Replaced w/BC coilovers around 2012, 6,000 miles on car.

LF green tag 15244327 - correct
RF brown tag 15784872 - incorrect
LR tan tag 15280026 - correct
RR tan tag 15280026 - correct

I bought some used BCs w/custom spring rates of 6kg front and 8kg rear. According to BC standard rate is 7kg.

I'd like to order some new BC springs that are closer to the original spring rates. According to a thread I found FE2 springs are: 125 lbs/in front and 175 lbs/in rear. Can anyone confirm this?
 
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