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post #1 of 15 Old 11-03-2016, 01:37 PM Thread Starter
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KYB AGX rear coilover L-Body install

What's up guys,

So I finally put all my research into a functioning product. After reading rx2mazda's thread on putting the adjustable KYB AGX's on his car (thread located on TM), I got to thinking about having a rear coilover setup on the Omni to help eliminate rear end squat during launches at the strip using the same struts.
This modification is a direct bolt in for L-bodies and gives you adjustable shocks with the ability to raise or lower the ride height.
So, I started my research, but won't dabble into what I found and bore you with numbers.. I will say this though, I bought some corner scales and weighed each corner of the Omni, and, since I'm only focused on the rear, concerned myself with the ~400 pound corner weights. From there, I guessed how much the trailing arm, brakes, hubs, rims/tires, etc. weighed and subtracted that from the sprung weight (how much weight is being supported by the rear suspension) to get a rough estimate of what springs I wanted. I came up with about 300 pounds, but I'll get to more later in the thread for which springs I actually went with. Anyways, on to the parts list I used with pricing and locations.

PARTS LIST

•Two(2) KYB AGX adjustable shock absorbers (P/N KYB 741033) $85.23 EACH from Summit Racing
•Two(2) 5" Coilover Sleeves (P/N A1-12451) $15.53 EACH from A-1 Racing Products
•Two(2) Spring Coil Over adjusting nuts (P/N A1-12460) $12.87 EACH from A-1 Racing Products
•One(1) Spanner wrench (P/N PROZ902) $9.95 from A-1 Racing Products
•Two(2) 8" Landrum Coil Springs 275lb/in (P/N Y8-275) $55.99 EACH from Summit Racing

Total Price NOT including shipping: $349.19

Now for a little side note, I chose 275lb/in rated springs because I wanted to have a controlled depression of the springs that will also slowly push the transferred weight back forward toward the front tires. With the adjustable dampening of the AGX's, I will have a little bit more fine tuning. Your spring choice is ENTIRELY up to you, but as a tidbit of info, STOCK GLH springs are 135lb/in rated. Also, you will need to find coil springs that have a 2.250" INSIDE DIAMETER should you decide not to go with the springs listed above.
AFTERTHOUGHT: I've been running with this setup for nearly a year, and I am going to swap out the springs from 275lbs/in down to something softer like 200 or 225lb/in rated springs.

Now I know this is a cheap alternative to bolt on kits that Rich and Cindy sell, but I'm pretty cheap and I only want this as a drag setup, nothing more, nothing less. So put your matches and gasoline away, take your flames somewhere else.

Since it is cheap, there are two things about this ensemble that will need to be addressed before you can throw it together.

1. The coil sleeve isn't exactly a smooth fit for inside the spring, so you will have to either dremel out the inside edge or grind the inside perch of the spring until the sleeve can slide in with ease. You ONLY need to do the part of the spring that SITS ON THE ADJUSTING NUT, not the inside coils. The inside coils clear the sleeve without a problem, it's just that first coil. This was probably the most time consuming part, but wasn't difficult by any means. There is still PLENTY of meat left for the spring to sit on the adjusting nut.

2.The sleeve itself isn't a tight squeeze over the shock body, so you will have to make a spacer of some sorts to go in between the shock body and the sleeve. I accomplished this by cutting a rubber floor mat from AutoZone into a strip and wrapping it around the shock body, using electrical tape to secure it. The sleeve then slipped over the shock body like a glove.


For the last bit of this project, you'll notice that I didn't list anything about the top parts of the coil over setup. That's because your stock L-Body stuff will slip right on top. The only thing that you can't use from your stock L-Body top parts is the tightening nut, but don't fret, your new KYB AGX's will come with a fancy new one. You'll see in the final pic below that the rear end is a little high, that's because I haven't adjusted it yet, but you get the idea, it will go lower.
AFTERTHOUGHT: The car will go lower, but at the lowest setting, you are sitting at a quarter inch below stock ride height. At MAX setting, you could fit a toaster between the top of the tire and the fender. The recommended fix is to find a 6" tall spring.

Finally, here are the pictures. As a note, you can see in one of the pictures of the final assembly, that the top bushing is in the wrong position. It was addressed, and is now taken care of.













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post #2 of 15 Old 11-03-2016, 02:00 PM
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Re: KYB AGX rear coilover L-Body install

"AFTERTHOUGHT: The car will go lower, but at the lowest setting, you are sitting at a quarter inch below stock ride height. At MAX setting, you could fit a toaster between the top of the tire and the fender. The recommended fix is to find a 6" tall spring."

Question: If you just wanted to duplicate the standard ride height, maybe go only 1/2" lower for fun, would you stick with your original parts list?

Or make any changes...

•Two(2) KYB AGX adjustable shock absorbers (P/N KYB 741033) $85.23 EACH from Summit Racing
•Two(2) 5" Coilover Sleeves (P/N A1-12451) $15.53 EACH from A-1 Racing Products
•Two(2) Spring Coil Over adjusting nuts (P/N A1-12460) $12.87 EACH from A-1 Racing Products
•One(1) Spanner wrench (P/N PROZ902) $9.95 from A-1 Racing Products
•Two(2) 8" Landrum Coil Springs 275lb/in (P/N Y8-275) $55.99 EACH from Summit Racing
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post #3 of 15 Old 11-03-2016, 02:48 PM Thread Starter
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Re: KYB AGX rear coilover L-Body install

As the car sits now with the 8" Landrum springs, it can sit at stock ride height without issue. I've set it to the lowest setting and, as stated, only goes about a quarter inch below stock ride height. I'm sure it would sink lower with a softer spring, but the best solution to this fix would be to obtain some 6" springs. The reason I left the parts list as it was when I put everything together is because it is the most detailed as far as part numbers and pricing goes. The only thing you would need to change is the springs, if you really wanted to. Otherwise, the setup works great as a replacement rear setup.

I plan on amending the writeup with new part numbers once I order and install the new 6" springs.
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post #4 of 15 Old 02-08-2017, 04:28 PM
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Re: KYB AGX rear coilover L-Body install

Hi Boosted Drummer, what did A1 want for there shock absorbers and why did u go to summit? just curious because i'm interested in the set up. What do u have for the fronts, did u use coil overs, if so can u give me the info on them, i'm really interested in making up a set for my Omni. Thanks Regards. Errol.
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post #5 of 15 Old 02-10-2017, 07:07 AM
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Re: KYB AGX rear coilover L-Body install

Errol, I believe he used the part numbers I gave him for A1
To my knowledge, A1 doesn't have those shocks for sale.

I just checked, Rock Auto has the rear shocks for $77.79
I've attached a pic of what I used to convert stock shocks and struts
I didn't like how the rears fit so I purchased the top hat for the rears and modified per the pic.
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post #6 of 15 Old 02-10-2017, 10:01 PM
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Re: KYB AGX rear coilover L-Body install

Did u also purchased the fronts from them too? Thanks regards.
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post #7 of 15 Old 02-10-2017, 10:08 PM
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Re: KYB AGX rear coilover L-Body install

Did not finish that sentence was everything purchased from Rock auto or just the front struts and shocks. and did the coil fit into the perch, u said u had to dremil them. So just purchase the springs from them or does Rock Auto supply everything. Thanks again. Errol.
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post #8 of 15 Old 02-11-2017, 09:29 PM Thread Starter
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Re: KYB AGX rear coilover L-Body install

Im sure you can find the AGX shocks elsewhere, I just went to Summit for the shocks and springs because the main store is only a 45 minute drive from my house. Everything else was purchased through A-1. The shocks are actually specific to a mitsubishi mirage if I remember my research correctly. It was nearly identical to the stock shocks save for a few millimeters here and there, but, its essentially a bolt on.
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post #9 of 15 Old 02-11-2017, 10:16 PM
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Re: KYB AGX rear coilover L-Body install

Thanks Keith Alto I very much appreciate your response, will make the purchases vey soon. Regards Errol.
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post #10 of 15 Old 02-14-2017, 04:55 AM
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Re: KYB AGX rear coilover L-Body install

Rock Auto only has the shocks
A1 Performance has all the threaded collars and nuts
Summit Racing has the cheapest coil over springs with the largest selection of lengths and spring rates
PM me your email address and I'll send you the information for all the parts and how to do it.
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post #11 of 15 Old 02-14-2017, 06:05 PM
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Re: KYB AGX rear coilover L-Body install

It's [email protected]
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post #12 of 15 Old 02-14-2017, 06:17 PM
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Re: KYB AGX rear coilover L-Body install

One more thing where did u buy the front struts. Thank u again. Regards. Errol
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post #13 of 15 Old 02-21-2017, 11:04 PM
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Re: KYB AGX rear coilover L-Body install

Hi Keith! one more question, what did u mean when u said 8"- 6" in spring, I measured them old springs and they are 13" long how will a 8" or 6" spring sit under the car. just trying to understand the system. Thanks again. Regards. Errol.
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post #14 of 15 Old 02-22-2017, 07:29 AM
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Re: KYB AGX rear coilover L-Body install

Quote:
Originally Posted by edg View Post
Hi Keith! one more question, what did u mean when u said 8"- 6" in spring, I measured them old springs and they are 13" long how will a 8" or 6" spring sit under the car. just trying to understand the system. Thanks again. Regards. Errol.
Which springs, front or rear?
If it's the rear, read the above posts, especially the third.
It was stated with 8" springs the rear was lowered Appx. 1/4", if you want to go lower use 6" springs.
I didn't look really hard for springs since I'm an hour from Summit racing, they only have springs in even lengths, 6",8", ect.
Didn't find any odd length springs, 7",9", ect.
The sleeves are 5" anyway, should be plenty of adjustment.
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post #15 of 15 Old 02-22-2017, 04:20 PM
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Re: KYB AGX rear coilover L-Body install

Thank u so much I was wondering, 8" on the shock that is short forgetting there's an adjustment on the sleeve. Thanks again Keith. Regards. Errol.
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