PabloCruise
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King Springs AHC KTRS-79
- Thread starter Ramathorn15
- Start date
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PabloCruise
SILVER Star
I ordered a set, they might actually arrive today, and I am dumb enough to try to install them before leaving for Black Hills Cruiser Classic tomorrow...
Is there a Driver side spring and a Passenger side spring?
Is there a Driver side spring and a Passenger side spring?
- Thread starter
- #23
Hey Pablo. I did mine at 9pm the night before leaving for Denver for the weekend. It's about a 2 hour job if you're taking your time.
You'll definitely need 2 jack stands, a floor jack, and your bottle jack or a second floor jack to make it easy.
- Thread starter
- #24
Make sure you undo your swaybar and keep an eye on your brake lines. If you don't undo the sawybar, you won't be able to lower each side enough.
sorry if this question has been answered somewhere else, I just couldn't find this info with a quick search. How does the free height and spring rate of these springs compare to the OE AHC springs? Trying to understand if this is the right choice for my truck - with my current setup I am very close to GVWR with camping/touring gear and just 3 occupants (2 avg-sized adults + 1 toddler)...
PabloCruise
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Were you pleased?
rjones
SILVER Star
X2 on this question.
I've lots of the other threads regarding these springs and everyone's success with them but what specific criteria are we using to say these are X more than AHC stock replacements? I've seen a few websites or sellers just list specs as, "Standrad Height H/duty Coil-rear". Anyone find anything more?
Thanks!
rjones
- Thread starter
- #28
Ohh yeah. They firmed up the ride a bit, but made it handle being loaded down a lot better.
For everyone else. Unless you're loading up a few hundred extra pounds of gear, you don't need these. You may just need newer regular ahc coils if your pressures are high.
I have drawers (~150) rear bumper (~100) roof rack (50-70 on the back) loaded with tools, camp gear ( probably another 100) and I load up 2 huskies (130)
I'm pushing the limits of these springs, but they still work well for my setup. I will likely need to add spacers at some point too.
PabloCruise
SILVER Star
PabloCruise
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rjones
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PabloCruise
SILVER Star
The KTRS-79 are a linear rate coil 130lb in rate. 430mm free height and 14.5mm wire.
From here: Definitive list of AHC maintenance items
There is a post somewhere that lists the factory AHC spring spec
PabloCruise
SILVER Star
My big problem now is that I had to re-install tech stream (long story, my wife's dog peed in my old computer and it died)
Now when I start Techstream, it asks me for a key. It do not think it did the first time. Has anyone else encountered this?
Now when I start Techstream, it asks me for a key. It do not think it did the first time. Has anyone else encountered this?
PabloCruise
SILVER Star
Here is the best info I have found:
470 AHC spring rate = 95 lbs/in
King = 130
450 = 150
100 = 170
From here: Updating AHC system
Thanks a lot @PabloCruise ! Just the info I was looking for. Seems to be about 1" of difference in the free height if you guesstimate the loss in the OE spring's free height due to age?
PabloCruise
SILVER Star
Could be, I am not sure. In the pics, the Kings look shorter, but the back of the LX definitely looks a little taller.
So far I like the ride! She feels more stable. We drove to Black Hills with a fridge in the back, and camping gear, pulling a pop-up camper. Plus the BIO rear bumper and sliders.
The back looks taller likely because of the big difference in spring rate.
Looking for recommendations. I have a 2005 LX with AHC. I am going to be installing front arb without winch and rear ARb bumper. i plan to do a full length rack as well and maybe sliders. I already have new LX coils installed. I am trying to decide if I just install the 30mm slee rear trim packers I currently have or new rear king springs to help with the weight. I plan to keep the front lexus torsion bars and adjust as needed. I occasionally tow 1-2k pounds. any recs? thanks in advance.
Since I've added a bit of weight to my LX I've noticed the AHC pressures slowly rising and the ride quality diminishing. After 4-5 hours on the highway the ride would feel stiff in Comfort setting like it was set to Sport II. In the last 2 years I've added KISS drawers w/ tools (~150), ARB 37 qt (40), NL PPP w/ Grp 24 AGM (50), 60L water (~100), hitch-mounted bike rack and fat bike (~50) and roughly 100 pounds of windsurfing\kitesailing gear\ARB 2500 awning to the roof. At 235k miles I am prepared for the inevitable replacement of AHC with conventional so I have the full Ironman FCP kit sitting in my garage but little time to swap it in before a trip to Hatteras next week. So, I spent 2 hours swapping in King KTRS-79 coils as a Hail Mary to see if I can save my beloved AHC.
The AHC system is in pretty good shape, flushed last spring, 7 ticks on the reservoir, height sensors all properly adjusted (20" front, 21" rear center hub to fender). I read AHC pressures with Techstream before and after swapping in the coils, and inlcuded measurements I took 2 years ago after I flushed/tuned the AHC system properly:
Stock coils (stock weight in 2016):
Front pressure: 5.5 mPa
Rear pressure: 7.0 mPa
Stock Coils (with ~500 lbs added weight):
Front pressure: 9.1 mPa
Rear pressure: 10.0 mPa
King coils (with ~500 lbs added weight):
Front pressure: 7.1 mPa (standard spec 6.9 +/- 0.5 mPA)
Rear pressure: 6.7 mPa (standard spec 5.6-6.7 mPA)
Ride quality has improved immensely and the rear is not too firm at all. Most importantly, I've retained all adjustable dampening from the AHC controller. Comfort feels just right in the front and much more controlled in the rear; before the swap the rear would feel too soft in Comfort. In Sport II the front feels much less harsh (less "crashing" with sudden dips) and the rear is perfect. Goes into Low with no problems. I have 235k on my AHC and the King springs were just the ticket to keep me going. I'll probably run like this until something major fails and then swap in the IM FCP kit.
Just wanted to share and add some hard data because this thread was very helpful for my situation. Cheers!
The AHC system is in pretty good shape, flushed last spring, 7 ticks on the reservoir, height sensors all properly adjusted (20" front, 21" rear center hub to fender). I read AHC pressures with Techstream before and after swapping in the coils, and inlcuded measurements I took 2 years ago after I flushed/tuned the AHC system properly:
Stock coils (stock weight in 2016):
Front pressure: 5.5 mPa
Rear pressure: 7.0 mPa
Stock Coils (with ~500 lbs added weight):
Front pressure: 9.1 mPa
Rear pressure: 10.0 mPa
King coils (with ~500 lbs added weight):
Front pressure: 7.1 mPa (standard spec 6.9 +/- 0.5 mPA)
Rear pressure: 6.7 mPa (standard spec 5.6-6.7 mPA)
Ride quality has improved immensely and the rear is not too firm at all. Most importantly, I've retained all adjustable dampening from the AHC controller. Comfort feels just right in the front and much more controlled in the rear; before the swap the rear would feel too soft in Comfort. In Sport II the front feels much less harsh (less "crashing" with sudden dips) and the rear is perfect. Goes into Low with no problems. I have 235k on my AHC and the King springs were just the ticket to keep me going. I'll probably run like this until something major fails and then swap in the IM FCP kit.
Just wanted to share and add some hard data because this thread was very helpful for my situation. Cheers!
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Does anyone know where to source these springs from? I am not having much luck finding them.
NEVERMIND - finally found the right place on eBay. Took an hour of searching. It seems as though all of the other sellers mentioned in this thread and a few others are out of stock. Finally found a pair here:
NEVERMIND - finally found the right place on eBay. Took an hour of searching. It seems as though all of the other sellers mentioned in this thread and a few others are out of stock. Finally found a pair here:
2x New King Springs STANDARD HEIGHT COIL SPRINGS For LEXUS LX470 UZJ100R - 4WD | eBay
Find many great new & used options and get the best deals for 2x New King Springs STANDARD HEIGHT COIL SPRINGS For LEXUS LX470 UZJ100R - 4WD at the best online prices at eBay! Free shipping for many products!
www.ebay.com
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