Explanation/back information on research done on suspension
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Explanation/back information on research done on suspension:
I wanted something that rode nice on the street since that is the vehicle's primary use, but would make the most of the suspension travel the vehicle has when off the pavement. I autocross and have built many street coilovers in the past, so I've had a lot of fun researching unique ways of addressing suspension setups. I considered a coil front/external rear, but didn't want to get into UCAs and shocks that would need more frequent maintenance than OEM units (debatable). I met one of the TRD engineers that designed and tuned the T/X TRD Baja Series Tacoma, and they had really positive things to say about Bilstein's product. Good seals, quality dampening.
Having road tested a ToyTech Lifted 4R, I felt I had a good baseline and knew what I was looking for... a little more compression dampening and if possible a little more travel up front. Stock, the 4Runner's front can ride stiff over harsh bumps, and I thought the Taco Billys addressed that. But I believe the progressive spring rate of a Tundra TRD front spring will match Bilstein's digressive dampening nicely. There's nothing wrong with the amount of dampening that the Tacoma fronts offer, but I've always preferred to run slightly higher dampening levels.
So I spent some time with one of the western area sales representatives for Bilstein, who was a huge help in figuring out compressed/extended strut dimensions and valving rates to figure out what would work best.
Here's their contact information:
AFTERMARKET & MOTORSPORTS HEADQUARTERS - WEST
ThyssenKrupp Bilstein of America
14102 Stowe Drive
Poway, CA. 92064
1-858-386-5900
Bilstein Rep: "Problem with 4Runner's stock suspension is the factory mount is post and eyelet in the rear, not eyelet/eyelet
5100: $75-200 ea, In post/eyelet, Bilstein has 3 valve setting options in 3 different lengths – Lower bushing 5/8”, so will need replaced by a 3/4" bushing in order to fit on the rear of the 4Runner.
IN ORDER TO UNDERSTAND VALVING RATINGS, READ THESE EXAMPLES: ->
FIRST # rebound | SECOND # compression. Higher #=firmer dampening, lower #=softer
> 360/80: Used on heavier trucks, industrial applications, etc
> 255/70: Highway hauling shock, or in front of truck b/c that's where the weight is. <<<<<<<<
> 170/60: Usually used in the rear.
- If not happy with valving, Bilstein can re-valve the shocks for $75 ea; it will take 6 weeks
Bilstein doesn't have anything off the shelf that is made for the 4Runner, but looking at the universal offerings, these are the three lengths he mentioned, with rebound and compression valve settings:
> 11.77 - 18.42 366/240
> 12.83 - 20.45 224/100 (rebound/compression) <<<<<<<< $75/ea for revalve service
> 13.27 - 21.5 298/94
7100: $150-200 ea --> No stem to eye mount offered, only 5/8" rubber bushing… I am trying to avoid adaptors at all costs, so I elected not to even look into options (DON’T BUY)
> Rebuildable: Valve adjustable by owner,
> Schrader valve to adjust nitrogen pressure (pressure range 180 lbs - 220 lbs)
- Gas inside shock adjustable (Think of basketball: more air pressure will rebound quicker when bounced…now apply to shock)
9100 bypass: Bypass race syle type shocks Heat sync - $600-800 ea
> 3/4" eye mount uniball eye allows for rotation, so will work for 4Runner rear.
> Adjustments made w/ knob, 6 zones of adj - 4 ext controls: 2 rebound, 2 compression adjusters
> Range: min 16"-24"… not going to happen on rear of 4Runner!
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FRONT 5100 STRUT OPTIONS CONSIDERED:
Bilstein P/N: F4-BE5-D558-T0 fits:
96-04 Tacoma
This is a hard strut to find information on. Nothing was listed on the Bilstein site, so I had to dig through the forums to find anything on it. Regardless, the Tacos valving and length numbers on the 5100 series shocks are as follows:
Tacoma valving, lengths Reb 228 Comp 73 Ext 473 Comp 352 (4.76" travel, baseline for others)
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Bilstein 24-188265 Monotube Shock Absorber Fits:
2001 - 2007 TOYOTA SEQUOIA Limited
2001 - 2007 TOYOTA SEQUOIA SR5
2000 - 2006 TOYOTA TUNDRA Base
2000 - 2006 TOYOTA TUNDRA Limited
2000 - 2006 TOYOTA TUNDRA SR5
Bilstein Part Number: 24-188265
46mm Monotube Shock Absorber
Internal Design: Monotube
Collapsed Length: 13.23 in / 336 mm
Extended Length: 18.68 in / 474.5 mm
Tundra valving, lengths Reb 303 Comp 96 Ext 474 Comp 335 (5.47" travel, dramatically increased rebound, mildly increased compression valving, and ~17mm of up travel (~.67"=10.7/16) that I might be able to capitalize on with revised front bump stops)
Boot Included: No
Mounting Kit: B4-KT1-Z219A00
Spring Seat: E4-FT1-Z011A01
Reservoir: No
Finish: Zinc Plated
Supercedes: F4-BE5-6929-H1
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Here is what I've ordered for suspension:
FRONT: $680
OEM 00-06 Double Cab Tundra front L & R springs for a TRD Off-Road: P/N: 48131AF320, 48131AF310 R - $189.00 list
Bilstein 5100 Tundra front struts on 1/5 (lowest) setting ~1.75”
OEM LBJ+bolts
SS tapered diff drop
So I put together a Tundra TRD from coil setup with a Bilstein 5100 front, and made sure the LBJs were in good shape.
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For the rear setup, I wanted a little more dampening on both sides of the spectrum, as well adjusting the range of suspension to ensure I wasn't sacrificing all of my down travel for the mild lift. I didn't want to do the ToyTec rear lift, as I'm just not a fan of the upper adaptor mount that converts the shock eye to the stud. There were actually a lot of options, allowing me to pick where I wanted my travel down to the 1/2". From there, I looked up the rebound compression settings that the ToyTech kit uses so I could figure out what I wanted to change. The dampening is 255 rebound/70 compression. According to Bilstein that is valving usually used in the front of a mid-sized truck. Here are the options I looked at, keeping in mind that I wanted additional dampening control (contrary to popular belief, Bilstein can rebuild and revalve 5100 for $75 ea... it takes 6 weeks to process and ship back - but they are not customer rebuildable).
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REAR SHOCK OPTIONS:
ToyTec Rear shock - from factory is eyelet to eyelet, so needs adapter which is included.
Bilstein P/N: 0711123 33-185590 H5
Compressed 13.58-13.66" Extended 21.54-21.63" (~7.97" shock)
Valving: 255 rebound valving 70 compression valving
Not an option IMO, b/c of the mounts.
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Bilstein 24-185684 Monotube Shock Absorber Fits:
1983 - 1986 FORD RANGER Base; 2 Doors; Standard Cab Pickup
1983 - 1986 FORD RANGER XL; 2 Doors; Standard Cab Pickup
1983 - 1985 FORD RANGER XLS; 2 Doors; Standard Cab Pickup
1983 - 1987 FORD RANGER XLT; 2 Doors; Standard Cab Pickup
1984 - 1987 FORD RANGER S; 2 Doors; Standard Cab Pickup
1986 - 1986 FORD RANGER Base; 2 Doors; Extended Cab Pickup
1986 - 1987 FORD RANGER STX; 2 Doors; Extended Cab Pickup
1986 - 1987 FORD RANGER STX; 2 Doors; Standard Cab Pickup
1986 - 1986 FORD RANGER XL; 2 Doors; Extended Cab Pickup
1986 - 1987 FORD RANGER XLT; 2 Doors; Extended Cab Pickup
1987 - 1987 FORD RANGER Custom; 2 Doors; Extended Cab Pickup
1987 - 1987 FORD RANGER Custom; 2 Doors; Standard Cab Pickup
1988 - 1992 FORD RANGER Custom
1988 - 1992 FORD RANGER S
1988 - 1997 FORD RANGER STX
1988 - 1997 FORD RANGER XLT
1989 - 1989 FORD RANGER GT
1990 - 1990 FORD RANGER S Plus
1991 - 1997 FORD RANGER Sport
1993 - 1997 FORD RANGER Splash
1993 - 1997 FORD RANGER XL
1995 - 1995 FORD RANGER XL Sport
Bilstein 24-185684
46mm Monotube Shock Absorber
Internal Design: Monotube
Collapsed Length: 12.87 in / 327 mm
Extended Length: 20.49 in / 520.5 mm
Rebound 224 Compression 100
Boot Included: Black Bellows
Mounting Kit: B4-KT1-Z103A02
Spring Seat: No
Reservoir: No
Finish: Zinc Plated
Supercedes: F4-BE5-6526-H7
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24-151627 Monotube Shock Absorber Fits:
999 - 2006 CHEVROLET SILVERADO 1500 Base, LS, LT
2002 - 2002 CHEVROLET SILVERADO 1500 Custom
2002 - 2006 CHEVROLET SILVERADO 1500 WT
2004 - 2006 CHEVROLET SILVERADO 1500 Hybrid
2004 - 2004 CHEVROLET SILVERADO 1500 Z71
Bilstein 24-151627
46mm Monotube Shock Absorber
Internal Design: Monotube
Collapsed Length: 13.27 in / 337 mm
Extended Length: 21.5 in / 546.2 mm
Rebound 298 Compression 94
Boot Included: Black Bellows
Mounting Kit: No
Spring Seat: No
Reservoir: No
Finish: Zinc Plated
Supercedes: F4-BE5-F162-H0
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Bilstein 24-100144 Monotube Shock Absorber Fits:
2000 - 2006 TOYOTA TUNDRA Base
2000 - 2006 TOYOTA TUNDRA Limited
2000 - 2006 TOYOTA TUNDRA SR5
Bilstein 24-100144
46mm Monotube Shock Absorber
Internal Design: Monotube
Collapsed Length: 13.84 in / 351.5 mm
Extended Length: 22.4 in / 569 mm
Rebound ____ Compression ______ (STILL WAITING TO HEAR BACK FROM BILSTEIN)
Boot Included: Black Bellows
Mounting Kit: B4-KT1-Z008A00
Spring Seat: No
Reservoir: No
Finish: Zinc Plated
Supercedes: F4-BE5-A014-H7
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So there are three options. I have a great picture below with madman-style notes that shows how the range of suspension is changed with the 2" lift I had planned. On the left is the OEM 4600 replacement Bilstein, followed left to right: Ranger, Silverado, then Tundra shocks.
I'm a visual person, so this is what worked for me. This is top to bottom.
- Compressed dimension
- Up travel measurement (circled)
- Static shock length with 50 lbs in back
- Down travel (circled)
- Extended length
- Valving, rebound/compression (255/70 is
not tied to the shock above it, it is valving information for the ToyTech rears)
Basically (right... ), I chose the Silverado rear shocks (third over from left) because of the strong rebound and compression dampening, as well as the balance of up and down travel. Also, remember that with more gear in the back, I will eat up what little up travel I have. If you are considering a 3"+ inch lift, I'd highly recommend the Tundra rears. I haven't heard back from Bilstein on the valving information, but it looks like the up/down travel would be nicely balanced. You will NEED to take time and measure to see if you'll need to run aftermarket bump stop to ensure you don't bottom the shock out (the shock is nearly 1.5" shorter than an OEM replacement).
BACK: $315
OME 906 rear spring (2”)
Bilstein 5100 for Chevy Silverado
"Adjust" rear inner-coil bump stops
¾” Rear Bushings
SS rear SS extended brake line
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The rest of this stuff will need to be figured out once I get everything installed. I'll need to make sure I space the rear stops enough so I don't bottom my shocks out. The rear panhard bar is a MUST in my book, but I'll have to wait until more funds come in.
Yet to be purchased:
Daystar stinger bump stops F & R
-OR-
Daystar bumpstops with custom adapter plates - $75-160
SS Adj rear panhard bar - $175 –OR- custom bar