11-05-2023, 10:15 PM
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#1
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Join Date: Jun 2011
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KDSS Question
I’m on the search of a ‘23 ORP in Lunar Rock. I’ve been debating the KDSS option. I like that it gives more articulation in slower off road situations (I remember how annoying it was to disconnect the sway bars when I used to off road my 3rd Gen).
I understand that on road, the KDSS allows better handling/flatter cornering. My specific question is how would it do on dirt roads at higher speeds? For example, if I’m on the Dalton Hwy in Alaska, which is a dirt road for hundreds of miles at speeds of 40-50 mph, wouldn’t the KDSS make the ride more bumpy as it “limits” travel?
I plan to do more dirt road type off roading instead of the more “hardcore” trails.
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1996 Limited 4x4 Anthracite Metallic (162,XXX miles)
-OME 881/890 with Tundra Bilstein Struts/Bilstein 5100 rear, 16" 5-Stars with 265/75R16 Duratracs, Savage Sliders and Skids, B&M 70268 Trans Cooler, Amsoil Fluids
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11-05-2023, 10:41 PM
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#2
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Senior Member
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Join Date: Jan 2017
Location: san diego
Posts: 3,189
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Quote:
Originally Posted by Kanger328
I’m on the search of a ‘23 ORP in Lunar Rock. I’ve been debating the KDSS option. I like that it gives more articulation in slower off road situations (I remember how annoying it was to disconnect the sway bars when I used to off road my 3rd Gen).
I understand that on road, the KDSS allows better handling/flatter cornering. My specific question is how would it do on dirt roads at higher speeds? For example, if I’m on the Dalton Hwy in Alaska, which is a dirt road for hundreds of miles at speeds of 40-50 mph, wouldn’t the KDSS make the ride more bumpy as it “limits” travel?
I plan to do more dirt road type off roading instead of the more “hardcore” trails.
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great on road handling, stiff off road handling. Disconnect at 4lo is great, but problem was it only disconnects in 4lo from the factory.
Game changer is the Dr.KDSS disconnect and associated bracketry. Allows you to bypass kdss whenever you want and/or brackets allow proper geometry to be retained.
Aftermarket skidplate options and suspension upgrades (different manufactures mount rezi's differently) can be confusing.
If you have no plans on going long travel, and if you do your research on armor upgrades then its a great option.
I heart my kdss system.
__________________
2016 trail 4runner, twin locked on 34's.
Can read more of my build here (2 parts):
https://www.lasfit.com/blogs/news/ho...ad-build-part1
Last edited by mrblah; 11-05-2023 at 10:44 PM.
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11-05-2023, 11:24 PM
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#3
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Join Date: Oct 2017
Location: Last Great Place
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I did the Dalton highway at 80 mph in my ‘95 K2500 Suburban w/ 6.5 diesel. The big rig trucks were doing the same.
Stay away from KDSS. It’s an expensive fix or delete to stock down the road.
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11-06-2023, 11:09 AM
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#4
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Join Date: Jan 2012
Location: Fruita, CO
Age: 43
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Senior Member
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Age: 43
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Quote:
Originally Posted by Kanger328
My specific question is how would it do on dirt roads at higher speeds? For example, if I’m on the Dalton Hwy in Alaska, which is a dirt road for hundreds of miles at speeds of 40-50 mph, wouldn’t the KDSS make the ride more bumpy as it “limits” travel?
I plan to do more dirt road type off roading instead of the more “hardcore” trails.
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Poorly. The fat, stiff swaybars are great for controlling body roll, but awful for absorbing bumps at speed. I have removed my front KDSS swaybar for this reason.
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11-06-2023, 11:13 AM
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#5
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Join Date: Oct 2023
Location: PA
Posts: 56
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Quote:
Originally Posted by Kanger328
I’m on the search of a ‘23 ORP in Lunar Rock. I’ve been debating the KDSS option. I like that it gives more articulation in slower off road situations (I remember how annoying it was to disconnect the sway bars when I used to off road my 3rd Gen).
I understand that on road, the KDSS allows better handling/flatter cornering. My specific question is how would it do on dirt roads at higher speeds? For example, if I’m on the Dalton Hwy in Alaska, which is a dirt road for hundreds of miles at speeds of 40-50 mph, wouldn’t the KDSS make the ride more bumpy as it “limits” travel?
I plan to do more dirt road type off roading instead of the more “hardcore” trails.
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KDSS does not lock the SB cylinders just due to speed. It takes a lateral G or steering input threshold to be reached. Until that it acts like it has no SB's. This is per a guy who instrumented and tested the KDSS. Apparently the 11 or 12 MPH rule isn't the entire story.
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11-06-2023, 12:14 PM
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#6
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Location: Denver, Colorado
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Quote:
Originally Posted by premise
KDSS does not lock the SB cylinders just due to speed. It takes a lateral G or steering input threshold to be reached. Until that it acts like it has no SB's. This is per a guy who instrumented and tested the KDSS. Apparently the 11 or 12 MPH rule isn't the entire story.
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Can you reference this information? I'd be interested to learn more about that.
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'13 TE w/ KDSS, 4:56 Gears, Dobinson's IMS C59-352/C59-701V, Sonoran Steel KDSS Trac Bar, Overland Custom Design Control Arms. Fuel Revolver 17x9 +1 mm 5" Backspace, Falken Wildpeak A/t3w 285/75r17, Hefty Fabworks Aluminum Front Bumper and Full Skids, C4 Fab Dual Swingout Rear Bumper, MetalTech OPOR Sliders, Northstar, Off-Grid Engineering, SPod, Blue Sea, Rigid, Baja Designs, KC HiLites, Stedi, Aplharex, National Luna, Drifta, Goose Gear, RAD Rubber Designs, Viair, Bandi Mount, URD, Gobi, ARB, Warn, Factor 55, Fourtreks, Axia Alloys, Desert Does It, Agency 6
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11-06-2023, 03:54 PM
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#8
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Join Date: Jan 2012
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Quote:
Originally Posted by premise
Until that it acts like it has no SB's.
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Not true. There is a vast difference in ride quality driving straight on a washboard road with KDSS and without.
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11-06-2023, 04:13 PM
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#9
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Join Date: Oct 2020
Location: Denville, NJ
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With the Dr. KDSS switch and upgrades I see no reason to not have KDSS except for the "more to break" reason. Yes, it's costly to fix, but it's a very reliable system. I'm personally not concerned with it and will cross that bridge if I ever need to (fingers crossed). The road manners make it 100% worth it in my opinion.
Disconnecting it via the KDSS switch makes a world of difference on washboards. There is no denying is is pretty stiff while connected offroad at speed, but I don't find it horrible either. I just notice the difference because I can turn it on and off instantly.
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Pete - 2018 Silver TRDORP w/ KDSS. 2" Fox 2.0s and 285/70r17 Maxxis Razr ATs
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11-06-2023, 04:16 PM
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#10
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Quote:
Originally Posted by premise
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Can you provide the information for the guy who instrumented and tested the KDSS LC system. I'd like to see the source and how it's relevant to the 4Runner KDSS system.
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'13 TE w/ KDSS, 4:56 Gears, Dobinson's IMS C59-352/C59-701V, Sonoran Steel KDSS Trac Bar, Overland Custom Design Control Arms. Fuel Revolver 17x9 +1 mm 5" Backspace, Falken Wildpeak A/t3w 285/75r17, Hefty Fabworks Aluminum Front Bumper and Full Skids, C4 Fab Dual Swingout Rear Bumper, MetalTech OPOR Sliders, Northstar, Off-Grid Engineering, SPod, Blue Sea, Rigid, Baja Designs, KC HiLites, Stedi, Aplharex, National Luna, Drifta, Goose Gear, RAD Rubber Designs, Viair, Bandi Mount, URD, Gobi, ARB, Warn, Factor 55, Fourtreks, Axia Alloys, Desert Does It, Agency 6
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11-06-2023, 10:39 PM
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#11
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its great on the highway. its great off road WITH DRKDSS switch and upgraded brackets. 10/10 would recommend. we kept up with stock gen2 raptors in baja. sway bar was not the limiting factor.
if youre going fast on dirt roads you will get to the point where you want the sway bar turned back on anyways. the switch from drkdss allows this.
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2016 TE : Grocery Getter, 34/10.5R17 Toyo at3, Prinsu Rack, King Coilovers, DuroBumps, ToyTec HD 2.0 springs, King shocks, King hydro bumps, Total Chaos mounts, DirtKing Fabrication UCA, VIVID RACING Tune, URD Y pipe, RCI skids, Marlin Crawler gussets, DRKDSS everything
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11-07-2023, 09:41 AM
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#12
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Quote:
Originally Posted by Jeremy556
Not true. There is a vast difference in ride quality driving straight on a washboard road with KDSS and without.
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Agreed. That's what I was trying to say. The "no SB" mode helps w/ ride harshness. And KDSS is in this mode, regardless of speed, unless lateral G or steering rate input thresholds are met. So uneven roads (especially left vs right), benefit a lot from not having a really thick SW active. I also believe the accumulators help ride harshness on washboard roads where the road variation is front to back vs left to right.
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11-07-2023, 09:44 AM
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#13
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Quote:
Originally Posted by comtn4x4
Can you provide the information for the guy who instrumented and tested the KDSS LC system. I'd like to see the source and how it's relevant to the 4Runner KDSS system.
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I've looked but can't find it. Between the 4Runner and GX sites, there's a lot of KDSS talk. Nonetheless the one link I attached previously shows the graph of conditions whereby KDSS is in "fixed SW mode."
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11-09-2023, 05:00 PM
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#14
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Join Date: Oct 2017
Location: Seattle, WA
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Quote:
Originally Posted by Kanger328
I’m on the search of a ‘23 ORP in Lunar Rock. I’ve been debating the KDSS option. I like that it gives more articulation in slower off road situations (I remember how annoying it was to disconnect the sway bars when I used to off road my 3rd Gen).
I understand that on road, the KDSS allows better handling/flatter cornering. My specific question is how would it do on dirt roads at higher speeds? For example, if I’m on the Dalton Hwy in Alaska, which is a dirt road for hundreds of miles at speeds of 40-50 mph, wouldn’t the KDSS make the ride more bumpy as it “limits” travel?
I plan to do more dirt road type off roading instead of the more “hardcore” trails.
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Get a Dr.KDSS switch. Basically works as a full sway bar disconnect, front and rear. Takes about a half hour to install. Push the button and the KDSS light will appear on the dash telling you the system is disengaged. I use mine all the time off-road and on. Takes the bite out of highspeed washboard roads or even just pot0hole filled paved roads and rail road crossings.
__________________
2017 TRD ORP KDSS IG
Dobinsons IMS w/ 314/325 Coils - JBA UCAs - Durobumps - Firestone 4108
DRKDSS Disconnect Switch - Treaty Oak KDSS Spacers - Eimkeith PCK
SSO Roof Rack - SSO Sliders - SSO Slimline - Smittybilt X20 10k - RCI Skids
TRD Pro Wheels - Spidertrax Spacers - Mickey Thompson Baja Boss A/T 255/85 R17
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11-09-2023, 05:04 PM
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#15
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Location: Seattle, WA
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Member
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Quote:
Originally Posted by CutthroatSlam
Stay away from KDSS. It’s an expensive fix or delete to stock down the road.
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KDSS failures are about as rare as engine failures in these trucks and these engines are considered bullet proof. For the average consumer, KDSS is great.
__________________
2017 TRD ORP KDSS IG
Dobinsons IMS w/ 314/325 Coils - JBA UCAs - Durobumps - Firestone 4108
DRKDSS Disconnect Switch - Treaty Oak KDSS Spacers - Eimkeith PCK
SSO Roof Rack - SSO Sliders - SSO Slimline - Smittybilt X20 10k - RCI Skids
TRD Pro Wheels - Spidertrax Spacers - Mickey Thompson Baja Boss A/T 255/85 R17
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