King shocks not working

Hi Guys i have a toyota fortuner 2022 with King 2.5 Oem series installed. The rear shocks are crap they make the vehicle fly when ever going through over a speed bump. Is this possible that i got a bad set of shocks?
I have got them tuned multiple times but no improvement. Other people
With same vehicle say theirs ride super nice.
I am thinking about getting fox 2.5 from accutune do you think it will make a difference?

 

Welcome to the forum, who did the tuning, and what springs are you running?

 

A local garage did the tuning they are well known here.
I am running 600 pounds king springs in front (tried 550 before) and stock in rear.

 

Fox and King will be similar once tuned and Accutune can do either. You won't see a difference so unless you can refund what you have it'll be better to just work with them.

 

So they ride extremely rough?

 

I am not from the US so i have two options. Either to sell my current set of kings and buy new from accutune or just keep my current set and live with it.
I have a good offer for my current set.
Will it be wise to purchase kings again from accutune? Isit possible i got a bad set the first time?

 

Front is fine but rear is rough. For example when going over a speed bump at speed or slow it feels like the rear tires jumps up in the air.

 

How high are you lifted in front & rear? I lifted mine 2.5" up front and 1" in the rear and it rode rough when going over speed bumps/ potholes, my solution that worked for me was replacing rear sway bar end links with longer ones made the ride a Lot better, you may wan t to try that first.

This is what i replaced mine with:

https://www.extremeterrain.com/dobi...X2EqZnPZFlAR8ueyOMxoCzfAQAvD_BwE&gclsrc=aw.ds


https://exitoffroad.com/product/dob...k-kit-for-toyota-4runner-fj-cruiser-se59-529/

 

2-2.5 in front and no lift in rear.
Can you please explain what you did in detail and if it completely solved your problem?

 

How will these help? Can i get these from king?

 

I replaced my suspension setup with the Fox OEM set, replaced front springs & rear springs with Eibach springs (~2.5" front lift, rear lift 1") it rode rough in the rear because rear sway bar was in a bind, so i replaced rear sway bar end links with adjustable links made the ride way better

 

Thanks will try that.
Hows the fox set up riding?

 

Note: I do not have KDSS and these are for NON KDSS 4Runner's

 

They ride really fantastic to me, way better than the original stock suspension

 

Which series do you have?
I am confused between factory race series and performance elite. Factory is cheaper. Any suggestions?

 

https://www.amazon.com/Genuine-Toyo...0549995&mcid=718b3dd372f23afdab8b0e27ffadf359


Is the set that I am running with eibach lift springs front & rear

 

Check your nitrogen pressure. If the shocks aren't at their proper psi, they can bottom out and the rear end would bounce off the bump stops.
Rear spring rate could be too stiff, but not likely if they are indeed factory.

 

Pressure is fine. A guy got me stock springs from some place i have some doubt that they are exactly according to factory specs as they seem thicker. But still the ride shouldnt be that bad.

 

These are the rear springs

 

I would venture to say the springs are the problem, but just a guess on my part. This is my 2017 SR-5 with 2 1/2 “ front with 2”rear OME springs. Very nice ride on and off road.

 

Does mine look oem to you? Before this i had ironman springs which were stiffer so when i switched the ride improved. The springs i have currently are not the originals that came with the car. Some guy sourced these for me.

 

Heres mine

 

Do you know how similar the Fortuner is to the 5th gen 4runner? Those rear springs seem narrower and taller than than my stock 4runner springs.

 

I think they are quite similar their shocks are interchangeable. What impact does narrower and taller springs have?
I too think that these springs are taller than fortuner oem springs and to me looks thicker too

 

End links don't have anything to do with the bounciness of a vehicle, it's just going to transfer some energy from one side to the other over one-sided bumps and cause squat in the corners. They can change how much by changing the angle (and therefore leverage) of the sway bar, but if there are issues with bouncing there are other issues.

More than likely, if a vehicle is bouncing there is a valving issue.

 

Thats what I thought but it has been revalved multiple times i even consulted ben from filthy motorsports

 

Taller springs make it taller, the extra turns and thicker coil diameter will mean different spring rate. The spring seats on the axle are also matched to the coil ends, so if your coils don’t match, they probably don’t interface very well with the seat.

This is my stock 5th gen coil
Sorry for the bad lighting

The bottom of the coil chokes down in diameter compared to the top. Correctly fitting aftermarket coils will coils also choke down in diameter so they fit over the protrusion on the coil seat, like this

The top of the coils are cut flat, and go flat against the top seat (actually, on a rubber isolator with a bump stop)

The coils you pictured don’t look anything like these. If the seats on your Fortuner are anything like they are in the 4runner, those things probably fit like garbage in there, and if they shift around could be eating into the steel.

 

OP, the rear springs you are showing us do not look like a rear spring for a 4Runner. They actually look like they should be on Coil Over shocks usually found on the front suspension. Try to take a picture of your rear axle spring perches.
The rear springs that @McSpazatron showed, are the only rear springs I've ever seen for the 5th gen 4Runner.

 

I suspect these are too long, causing the spring coils to stack solid before the axle hits the bumpstops.

The Fortuner has the coil springs on beefed up lower links (making them kinda like trailing arms), so they are narrower and longer than 4Runner's. Even so, I suspect @Aounm92's springs are too long.

 

The springs that OP posted pics of don't really resemble the ones in the rendering you posted. Proportionally they look to be a similiar size as the 4Runner rears. Im sure the rate is different given the trailing arm mounting location. Hmm most puzzling...