Taco PRO Owners: Interested in a spring upgrade for front?

These are the KM3 285/75/16

 

i will be watching for these springs, i have 2017 Pro fox's in garage with broken spring on drivers side spring, i hope they are red, when they are available im in for a set..

 

Bump
Keeping the dream alive

 

I’m in for a set for sure!!!

 

Count me in! If you need a test truck... I'm down the street in OC with a 2020 TRD Pro

 

Since the 2016-2019’s use a different style spring up front from the 2020’s, I wonder which one they’ll make?

 

They are going to make both. There is actually a bit in this thread about how he got his hands one a newer pro and the springs are not the same as the older models.

 

Any updates on them?

 

Today is your lucky day!

 

@Ryan at Eibach You're giving me blue springs over here. Do you have a status update?

 

Interesting. I have 255/85-16 S/T Maxx on OEM Baja beadlocks. I'm ultimately adding a hybrid front bumper and a 12k lb winch with synthetic line, and a full plate H/C rear with dual swingouts for a spare that's the same as the other 4, and dual jerry cans.

I currently have sliders, a cabrac, recovery gear, will have a 14 gal waterport (@ 125lbs when camping), dual batt. and I run a ARE MX cap, and a ARB canopy.

I plan on installing these to help with any sag and would appreciate your input.

 

Welcome to the best damn Tacoma forum on the interwebs

 

What shocks are you planning to put those springs on?

 

2019 TRD Pro OEM Fox shocks.

 

I wouldn’t put those on. They will most definitely be in coil bind when the shock is compressed because the block height will be greater than the distance of the spring seats on the shock. Seems like it could be bad and possibly dangerous. My suggestion would be either get new adjustable coilovers that can accept that exact spring or possibly try eibachs springs that they designed to work with the stock Pro fox shocks even tho I’m against them as these shocks were specifically designed for the springs that they came with. Since the pro fox shock has roughly 4.4 inches of travel you run the risk of riding in the rebound zone of the shock which won’t ride as good anymore. If eibach does make a specific spring that would essentially get you back to factory height with your added weight I would shoot for that if you are set on keeping them. Just keep in mind the shocks were not tuned for 700lbs springs so they would most certainly top out harder with a higher spring rate and the ride will not be the same as it was with the stock springs. BTW clean truck.

 

Bump
Still keeping the dream alive
Still sagging
Still patiently waiting
One day, return to stock pro glory

 

I was kind of wondering this too about the struts not being tuned for that spring

 

This certainly sounds like a intelligent explanation.

Are you merely saying that by adding weight to the front end, and adding a taller coil to a shock, you're essentially cramming more material into a space it cannot handle, thereby causing the coil into a constant "bind" situation? *Note. For anyone uneducated like me, Bind is when the coil is compressed to the point it no longer has the ability to act as a spring.

This would be easy to deduce, even for me, if the stronger (aka higher rate) coil was the same length as the OEM coil. Or if the taller coil had the same OEM rate. But it confuses me that the shock would suffer with more weight, and reacting to that by adding a taller/stronger coil.

Will there be times of coil bind during extreme conditions? Perhaps. Will this cause a less than optimal feel? Most likely. But it sounds like you're saying that the overall travel will be reduced by the additional 2" of coil height. And that is what going to be harmful to the shock.

So a couple things I will ask are......... what if you drive the truck in conditions that never extend or decrease the travel any more than an inch? We both know that's 99.9% impossible but.......what if you don't care if the ride is harsher? Is it definitely possible to compress a 2" taller spring with a higher rate into a coil bind situation under normal to more than normal, but not extreme circumstances?

Or, perhaps this coil is simply old tech, it worked but now the new coils Eibach is making is better?

Edit - Thanks, I try to keep it clean, but it isn't often. This is my second in 3 years. Also, I plan on adding a 3 leaf AAL pack once I do the coils. The leaf packs are just sitting in the garage waiting.

Me too. But it has to serve a purpose or it wouldn't exist.

 

The 14” 700lbs coil is too long for the factory pro fox shocks. There would be far too much preload because of the fact that the coil is too long, 14” stock vs factory pro spring at 12.6”. So what would most likely happen is because of the crazy preload it would take to get that coil on it will be violent when the shock tops out (fully extends) even with the shock having a rebound zone which normally limits harshness. When the shock is fully compressed the coil would be what stops the shock from compressing all the way, not your factory rubber bump stop which puts all the force on the coil bucket vs the frame where the bump stop sits. This is the reason spacer lifts are bad and people just don’t seem to understand or care. You would probably get to much lift and would be riding in the rebound zone as well as the coil rubbing against the shocks body because the coil will be slightly bowed because of the excess preload and length. Unless you drive extremely slow, have no dips, pot holes, ect.. I don’t think it would be possible under normal driving to only use 1 inch of travel. I guess you could if you drive like 5 mph and avoided any and all obstacles but that’s not realistic. Most people don’t use there trucks to the limit so to some with spacer lifts they never get into a point of it being an issue which is why there are so many sold and on so many trucks without issue. Eibach was working on a heavier rate coil that would fit on the pro shocks. The spring would have to be close in length to the factory spring theoretically but who knows with eibach I’m sure they could design a longer spring to make work as intended. And you are correct coil bind is exactly as you put it, but as long as the coil is the same length as the shock when fully compressed it shouldn’t be an issue. Usually you want the shock to be fully compressed (hard bump) and still have 1/2 inch or so until the coil is in bind.